Startseite Mechanical properties and microstructure of nano-strengthened recycled aggregate concrete
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Mechanical properties and microstructure of nano-strengthened recycled aggregate concrete

  • Yuanxun Zheng , Yahui Zhang , Jingbo Zhuo , Peng Zhang EMAIL logo und Weixing Kong
Veröffentlicht/Copyright: 4. April 2022
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Nanotechnology Reviews
Aus der Zeitschrift Nanotechnology Reviews Band 11 Heft 1

Abstract

The surface adhesion mortar of recycled coarse aggregate (RCA) is the main factor leading to poor aggregate quality, and it also affects the internal structure and mechanical properties of recycled aggregate concrete (RAC). To improve the quality of RCA and mechanical properties of RAC, self-developed mortar removal equipment was used to strengthen the RCA. Then, the RCA was soaked in 1, 2, and 3% nano-silica solutions, and the vibration-mixing process was used to improve the quality of RAC. In addition, the microstructure of the RAC was examined via scanning electron microscopy to observe its improvement effect on the microstructure of the RAC. The results indicated that the quality of the RCA was improved by mechanical and physical strengthening, and the water-absorption rate and crushing value decreased by 32.9 and 23.9%, respectively. The improvement effect of nano-immersion on the RAC was obvious. The optimal condition was a combination of physical strengthening, 2 days of immersion in 2% NS solution, and vibration stirring. The 28 day compressive strength increased by 31.3%, the splitting tensile strength increased by 23%, and the flexural strength increased by 49%. The proposed strengthening method improves the mechanical properties and microstructure of RAC. The results of this study provided a technical reference for the mechanical strengthening of RAC and promotion of the application and popularization of RAC.

Keywords: recycled coarse aggregate; nano-SiO2 ; mechanical strengthening; compound strengthening; mechanical properties; microstructure

1 Introduction

With the promotion of urban-rural integration and infrastructure creation, a large amount of construction materials has been consumed, and a large amount of abandoned construction waste has been produced. If not treated, construction waste will not only cause serious environmental pollution but also occupy a considerable amount of farmland. Therefore, the effective recycling of construction waste is an urgent engineering problem that must be solved for sustainable development [1–3]. After the simple crushing of recycled coarse aggregate (RCA), the surface becomes not only rough with multiple edges and corners but is also attached to a large amount of cement mortar. In the preparation, owing to external forces, numerous microcracks are generated, resulting in the defect of a high water-absorption rate. To improve the quality of RCA, many physical and chemical methods have been proposed for removing or strengthening the old RCA mortar. The main methods for removing the mortar are heating [4] and acid treatment [5]. The main methods for strengthening RCA are carbonization [6] and solution strengthening [7]. The main crushing mode of concrete is mechanical crushing. When subjected to an external force, the waste concrete is forced to separate. Although this method can realize RCA mass production and reduce the production cost, the RCA produced has a large amount of adhered mortar, which affects the quality of the recycled concrete. The performance of the RCA can be improved by secondary slurry removal [8,9]. Marta and Pila [10] heated the saturated RCA at 500°C and soaked it in hydrochloric acid for de-pulping the RCA. The acid solution strengthening method can improve the quality of RCA without changing its morphology, but this method damages the internal structure of the RCA, affecting its performance. In conventional heating, RCA is heated at two different temperatures (300 and 500°C) and then cooled in water at 25°C [11]. In mechanical friction, RCA is put into a machine. After grinding, the old mortar on the RCA surface is removed, which improves the combined effect of the RCA and new mortar. Akbarnezhad et al. [12] treated the adhered mortar layer on the RCA surface with microwave heating and mechanical grinding, effectively improving the physical properties of the RCA. Microwave weakening pretreatment can improve the mechanical properties of recycled aggregate concrete (RAC) [4]; however, the cost of this method was relatively high and the operation was complicated. The performance of RCA is improved by solution immersion, which is facile and requires little equipment. Owing to the large difference in the performance of the solution, the improvement effect on RCA is also different. Many scholars have used nano-solutions to improve RCA and RAC. Studies have indicated that nano-silica (NS) can consume Ca(OH)2 in RCA to improve its quality and can also react with Ca(OH)2 – the hydration product of cement – to form calcium silicate hydrate (C–S–H) gel, improving the compactness and strength of RAC [13]. Shaikh et al. [14] used pre-immersion and incorporation methods to strengthen RAC and reported that the compressive strength of the RAC was increased by approximately 5% after soaking in an NS solution. In addition, the composite strengthening effect of the two methods was more obvious than the effects of the individual methods. The addition of a sufficient amount of fine-grained pozzolanic additive in the form of fly ash that contain active silica (SiO2) causes a gradual reaction with calcium hydroxide (CH), consequently forming significant amounts of the calcium silicate hydrate phase. As a result, there is not only an improvement in the quality of the hydrates but also quantitative changes in the structure of the cement matrix [15–17]. Gao et al. [18] used a nano-CaCO3 solution to strengthen RCA; the compactness of the RCA was increased, and the compressive strength and compactness of the RAC were improved. Shaban et al. [19] soaked RCA in different types of volcanic-ash solutions to improve the performance of the RAC. When 40% mud and 3% nano-silicon powder were mixed, the strengthening effect was optimal. Mukharjee and Barai [13] found that when NS was added to RAC, the gap of the RAC was filled with NS particles and reaction products, and the strength and compactness of the interfacial transition zone (ITZ) were improved. The peak flexural tensile strength of the RAC reached 4.97 MPa – an increase of approximately 15%. Zeng et al. [20] found that soaking RCA in a nano-solution can increase the compressive strength of the RAC, enhance the strength of the ITZ between the old and new mortar, and reduce the width of the ITZ. Li et al. [21] added NS particles to RAC, and the compressive strength of the RAC was increased by 21.6%. Nuaklong et al. [22] found that the compressive strength of RAC was increased by 13% after the incorporation of NS, but the resistance to chloride ions was reduced. The addition of fly-ash changes the consistency of RAC and improves its mechanical properties [23–25].

Most of the previous studies involved single reinforcement of RCA, and the reinforcement effect was not obvious. In this study, the quality of RCA was improved by physical slurry removal and soaking in NS solutions with different concentrations for different amounts of time, and the mechanical properties of the RAC were enhanced by a vibrational stirring process. The improvement effects of single and compound strengthening on the mechanical properties of the RAC were studied, the internal microstructure of the RAC was examined via scanning electron microscopy (SEM), and the mechanisms whereby the different strengthening methods improved the internal microstructure of the RAC were studied.

2 Experimental investigation

2.1 Raw materials

RCA was obtained by crushing waste concrete at a construction site in Henan Province, China, and then processed by secondary slurry removal equipment. The physical properties of the RCA before and after slurry removal are presented in Table 1. P.O 42.5 ordinary Portland cement was used, and its performance indicators were in accordance with the specifications of “General Portland Cement” (GB175-2007). The fine aggregate was natural river sand, with a fineness modulus of 2.67. The NS solution was the HTSi-11L solution produced by Nanjing Haitai Nanomaterials Co., Ltd. The physical properties of the NS solution are presented in Table 2. The water used was laboratory tap water. The chemical strengthening of the RCA was conducted as follows: the RCA (particle size of 5–20 mm) was cleaned and air-dried and then immersed in a 1, 2, or 3% NS solution for 24 or 48 h, as shown in Figure 1. After the immersion, the RCA was spread in a ventilated place to air-dry naturally.

Table 1

Physical properties of the RCA before and after slurry removal

Absorption rate (%) Apparent density (kg/m3) Packing density (kg/m3) Crush value (%)
RCA 7.9 2,600 1,253 16.3
RCA (after slurry removal) 5.3 2,710 1,305 12.4
RCA (modified by 2% NS solution) 3.7–4.2 2,730–2,763 1,323–1,361 10.5–11
Table 2

Physical properties of NS solution

Appearance Density (g/cm3) Size (nm) pH Purity Price/kg
NS White flocculent powder 1.1–1.2 15–30 9–10 ≥99 $13
Figure 1 Soaking of RCA.
Figure 1

Soaking of RCA.

2.2 Mix proportions

The design strength grade of the RAC was C30. The mix proportion was designed according to JGJ55-2011 “Ordinary Concrete Mix Design Regulations.” The water-cement ratio was 0.5, and the sand ratio was 36%. The RCA replacement rate was 100%, and the particle size of the RCA was 5–20 mm. The mix proportions are presented in Table 3.

Table 3

Mix proportions of RAC

Mix type Water–cement ratio Water (kg/m3) Cement (kg/m3) Sand (kg/m3) RCA (kg/m3) Solution concentration (%) Immersion time (day)
NP 0.5 210 420 619 1151.3 \ \
ZP 0.5 210 420 619 1151.3 \
CP1-1 0.5 210 420 619 1151.3 1 1
CP1-2 0.5 210 420 619 1151.3 1 2
CP2-1 0.5 210 420 619 1151.3 2 1
CP2-2 0.5 210 420 619 1151.3 2 2
CP3-1 0.5 210 420 619 1151.3 3 1
CP3-2 0.5 210 420 619 1151.3 3 2
NZ 0.5 210 420 619 1151.3 \ \
CZ 0.5 210 420 619 1151.3 \ \
CZ1-1 0.5 210 420 619 1151.3 1 1
CZ1-2 0.5 210 420 619 1151.3 1 2
CZ2-1 0.5 210 420 619 1151.3 2 1
CZ2-2 0.5 210 420 619 1151.3 2 2
CZ3-1 0.5 210 420 619 1151.3 3 1
CZ3-2 0.5 210 420 619 1151.3 3 2

Note: N represents the original RCA, C represents the treated RCA, P represents ordinary stirring, and Z represents vibration stirring; for example, CP1-2 represents RAC produced by RCA ordinary stirring after soaking in the 1% NS solution for 2 days (48 h).

To investigate the effects of different strengthening methods on the early and late strengths of the RAC, 16 groups of tests were conducted, and each group was divided into three ages: 7, 14, and 28 days. For each age, three specimens were produced; thus, the total number of test blocks was 432.

2.3 Grinding test of RCA

The grinding equipment used in this test is a self-developed RCA grinding machine, as shown in Figure 2. When RCA was given an external force (between the strengths of coarse aggregate and the bonding surface), the attached mortar and aggregate separated under the action of force, and the RCA after removing the mortar was obtained. The machine was turned at a frequency of 18 Hz. After the simple crushing of RCA, the surface was rough, with multiple edges and corners, and was also attached to a large amount of cement mortar. After the equipment treatment, the old mortar on the surface of RCA was significantly reduced and the particle shape was better. The quality of RCA was effectively improved, and the water absorption and crushing value were reduced. The effect of removing mortar is shown in Figure 3.

Figure 2 (a) RCA slurry removal equipment and (b) workflow.
Figure 2

(a) RCA slurry removal equipment and (b) workflow.

Figure 3 Comparison before and after removing mortar: (a) original RCA and (b) treated RCA.
Figure 3

Comparison before and after removing mortar: (a) original RCA and (b) treated RCA.

2.4 Vibration stirring process

In vibration mixing, the optimal arrangement of blades in the mixer led the mixture to undergo forced circumfluence and countercurrent movement, so that the process was uniform. Vibration mixing can enhance the convective and diffusion motion between RCA and cement mortar. The protective film on the surface of the cement paste got destroyed, allowing water to enter the cement paste more easily. This made the cement paste more evenly distributed and allowed the hydration reaction to progress, further improving the structure of the ITZ and the overall performance of the mixture. The vibration mixer was a 60 L double-horizontal shaft vibration mixer with an input power of 4 kW and a vibration input power of 3 kW.

2.5 Compressive strength test

The size of the compressive-strength test specimens was 150 mm × 150 mm × 150 mm. The compressive strength test was performed using a WHY-2000 concrete pressure test machine, in accordance with the GB/T50081-2002 specifications. After the specimen was removed from the maintenance room, its surface was cleaned. The specimen was placed at the center of the press cap so that the center of the specimen was aligned with that of the upper and lower caps of the testing machine. The contact surface of the specimen subjected to the load was perpendicular to the forming surface of the specimen. The arithmetic mean value of the three specimens was taken as the test result.

2.6 Splitting tensile strength test

The size of the splitting tensile strength test specimens was 100 mm × 100 mm × 100 mm. The splitting tensile strength of the RAC was tested in accordance with GB/T50081-2002. The test block was placed in the center of the testing machine. A circular arc pad and pad bar were mounted on and below the specimens. The fracture surface of the splitted cubic specimen was perpendicular to the upper surface of the specimen.

2.7 Flexural strength test

The size of the flexural-strength test specimens was 100 mm × 100 mm × 400 mm. This test was conducted in accordance with GB/T50081-2002. After the specimens were removed from the curing room, the surface was wiped clean. The test was performed using a WHY-300/10 microcomputer-controlled pressure test machine.

3 Results and discussion

3.1 Compressive strength

Compared with untreated RCA, the compressive strength of the RAC after physical strengthening increased by 18.19, 14, and 7.64%, respectively. The enhanced RCA can effectively improve the compressive strength of RAC, particularly the early compressive strength. Cementing force between RCA and new cement mortar was strengthened after slurry removal [26,27].

The compressive strength of the CZ group was higher than that of the CP group at each age, indicating that vibration stirring can enhance the compressive strength of RAC. This is because the energy generated by vibration stirring was transmitted to the RAC through the stirring shaft, which increased the friction and frequency of collision between the mixtures, dispersing the cement particles and facilitating the hydration process [28]. The exciter designed with the mechanism of dynamic balance was built into the center of the mixing drum so that the vibration energy could be better absorbed by mixtures, boosting the uniformity of fresh concrete. Meanwhile, the energy also caused the cement particles to continuously flutter around an unbalanced middle position. With the increase in frenquency of vibration of the particles, the density of RAC will be increased and the microstructures of RAC can be improved. The products can fill the pores in the RAC and the microcracks in the ITZ. When only physical and production strengthening were used, the strength of the CZ group was increased by 25, 19.4, and 16.1% for the ages of 7, 14, and 28 days, respectively, compared to the NP group, and the effect of the composite strengthening was more significant than that of single strengthening.

As shown in Figure 4, the compressive strength of the RAC was improved more effectively when a nano-solution was used for strengthening, which is consistent with the results of Gao et al. [18]. The improvement effect of the NS on the early compressive strength was better than the late, possibly owing to the active participation of NS in the early cement hydration, the filling of the fine pores, and the better spray effect. In the later stage, the cement hydration was sufficient, and the hydration products were dense. In addition, the NS adhered to the outside of the voids owing to its strong cohesion; it formed a film preventing cement hydration and slowed down the increase of strength [29,30]. The CP2-2 group had the best 28-day compressive strength (24.3% higher than that of the NP group). For 1 day of soaking in a nano-solution, the compressive strength of the RAC increased with the concentration of the NS solution. The effect of 2 day immersion was better than that of 1 day immersion. However, the compressive strength of 3% immersion for 2 days was slightly lower than that of 1 day immersion, and it was lower than that of 2% immersion for two days. Thus, when the concentration was high, a longer soaking time was not better. This is explained as follows: when the RCA was immersed in a high-concentration solution for a long time, it was filled with numerous NS particles, which accumulated on its surface. In the reaction with cement, the NS particles on the RCA surface underwent a secondary reaction with the hydration product of cement, that is, Ca(OH)2, to form C–S–H which prevents the NS particles from continuing to reflect on it. Excess NS will accumulate in the RAC, adversely affecting its strength [31]. Byung-Wan et al. [32] reported that an appropriate amount of NS can fill the cracks of RAC, and the products generated by the reaction of Ca(OH)2 improved the microstructure, compactness, and compressive strength of the RAC.

Figure 4 Compressive strengths of the RAC at various ages. (a) Ordinary mixing mode and (b) vibration mixing mode.
Figure 4

Compressive strengths of the RAC at various ages. (a) Ordinary mixing mode and (b) vibration mixing mode.

Under composite strengthening, the CP2-2 and CZ2-2 groups had higher compressive strengths. Between them, the CZ2-2 group had a higher 28-day compressive strength (31.3% higher than that of the NP group). The results of Li [33] indicate that when the NS concentration was 2%, the compressive strength maximized by 21.6%. The composite strengthening method of physical slurry removal, nano-immersion, and stirring had a better effect on the RAC. Vibrational stirring can make NS particles attached to RCA react fully with hydration products of cement while improving the microstructure and strength of the RAC [34].

3.2 Splitting tensile strength

As shown in Figure 5, physical slurry removal enhanced the splitting tensile strength at each RAC age by 10.85, 7.31, and 6.53%, particularly the splitting tensile strength at the early stage. Less mortar is attached to the RCA surface after slurry removal, which improved the particle shape of the RCA and strengthened the cementing force between the RCA and the new cement mortar [35]. The splitting tensile strength of RAC can also be improved by vibrational stirring. Compared with the NP group, the strength of the CZ group was increased by 18.9, 14, and 12.1%, respectively. The effect of composite strengthening was more significant than that of single strengthening.

Figure 5 Splitting tensile strengths of the RAC at various ages. (a) Ordinary mixing mode and (b) vibration mixing mode.
Figure 5

Splitting tensile strengths of the RAC at various ages. (a) Ordinary mixing mode and (b) vibration mixing mode.

When chemical strengthening was used, the splitting tensile strength changed in accordance with the compressive strength at each RAC age. In the case of soaking for 1 day, the splitting tensile strength of the RAC increased with the soaking concentration, but with an increase in the soaking time, the splitting tensile strength was the highest for the concentration of 2%, with a value of >3%. The 28-day splitting tensile strength of the CP2-2 group was increased by 18.2% compared to the NP group. This is because, with the increase in the immersion concentration and time, a large number of NS particles were accumulated on the RCA surface, exceeding the amount of Ca(OH)2 involved in the reaction [15–17]. The excess part had caked, affecting the binding force of the RCA and mortar, generating numerous cracks, and affecting the strengths of the ITZ and RAC [32].

CZ2-2 exhibited the highest tensile strengths of 2.85, 3.25, and 3.58 MPa, which were increased by 34.4, 25, and 23% compared with the NP group. The composite strengthening improved the bonding force inside the RAC and enhanced the cracking resistance [35]. The splitting tensile strength of the RAC was significantly improved.

3.3 Flexural strength

As shown in Figure 6, the cracking of unstrengthened RAC mostly occurs at the interface between the RCA and cement mortar, because there is a large amount of old mortar attached to the untreated RCA surface [8,9], which reduced the binding force between the RCA and the new cement mortar [36] and affected the flexural strength of the RAC. The section of RAC after composite strengthening was relatively complete, with most of them being integral fractures, and a small part occurring at the ITZ of the RAC. It can be concluded that the physical slurry removal, NS immersion, and vibration stirring significantly improved the compaction performance of the RAC, enhanced the cementation capacity of the RCA and new mortar [18], and improved the bending strength of the RAC.

Figure 6 Cross sections: (a) NP and (b) CZ2-2.
Figure 6

Cross sections: (a) NP and (b) CZ2-2.

In general, physical strengthening improved the flexural strength of the RAC at all ages. In comparison with the NP group, the flexural strength of the CP group increased by 14.47, 14.17, and 9.1% for the ages of 7, 14, and 28 days, respectively. This was mainly because the RCA surface adhered to the old mortar, leading to low strength and high water-absorption rate. When the cement reacted, untreated RCA released a part of water, forming holes and fine cracks, which reduced the cementing capacity and strength of the RCA and new mortar. However, with strengthened RCA, these shortcomings were mitigated, enhancing the strength of the RAC [12,36]. The flexural strength of RAC can also be improved by vibrational stirring. The 28 day flexural strength of the CZ group was 34.6% higher than that of the NP group, and the composite strengthening effectively improved the flexural strength of the RAC.

As shown in Figure 7, after chemical strengthening, the 28-day flexural strength of CP2-2 was 39.1% higher than that of the NP group. The effect of the chemical strengthening on the flexural strength was similar to that of the splitting tensile strength. It was optimal when the immersion concentration was 2% and the immersion time was two days. This is because NS particles attached to the RCA surface reacted with Ca(OH)2 in RCA to improve the defects of RCA’s performance and simultaneously reacted with cement hydration products to improve the structural strength of the ITZ between the RCA and the new cement mortar. The cement particles and NS particles in the agglomerated state were dispersed by vibrational stirring, which promoted the aforementioned hydration reaction. NS particles could better fill the pores of C–S–H and act as crystal nuclei to form a denser structure, improving the RAC microstructure and enhancing the strength of the ITZ [34,37].

Figure 7 Flexural strengths of the RAC at various ages. (a) Ordinary mixing mode and (b) vibration mixing mode.
Figure 7

Flexural strengths of the RAC at various ages. (a) Ordinary mixing mode and (b) vibration mixing mode.

4 Microstructure of RAC

The microstructure characteristics of RAC determine its macroscopic properties [38] to a certain extent, thus affecting the mechanical properties of the RAC. The microstructure of the interface was composed of CH crystals, pores, and C–S–H gel [39–41]. The microstructure study is often based on a single method, with complex external factors, and the research results are not uniform. Many scholars have studied the composition, porosity, hydration products, strength, and density of the RAC microstructure – particularly weak structures such as the ITZ [12,19,20]. The microstructure characteristics are related to the chemical and physical changes of the cement slurry and the aggregate [42] and are closely related to the water-cement ratio, admixtures, and external influencing factors.

As shown in Figure 8(a), in the NP specimen, the ITZ between the RCA and the new mortar had a crack that started from the ITZ and extended from the mortar, spreading around. The crack was large, and the fit between the RCA and the cement mortar was poor. Under a load, the ITZ was prone to the generation of penetrating cracks. As shown in Figure 8(b), the number of pore cracks in the interface area between the RCA and the new mortar was reduced. The ITZ width was small and the structure was relatively dense.

Figure 8 Microstructure of RAC. (a) N-P, (b) C-P, (c) C-Z, (d) CP2-2, and (e) CZ2-2.
Figure 8

Microstructure of RAC. (a) N-P, (b) C-P, (c) C-Z, (d) CP2-2, and (e) CZ2-2.

The hydration reaction of RAC prepared by ordinary stirring was not uniform, and there were large and small internal pores and cracks. As shown in Figure 8(a), the surface uniformity was poor, and there were agglomerated cement particles and large water cluster particles. The RAC prepared by vibration stirring had a uniform microstructure, dense internal structure, and no dense distribution of voids and cracks. In addition, the agglomeration phenomenon and large water cluster phenomenon caused by the cement in the RAC were eliminated; thus, the hydration reaction of the RAC cement slurry was sufficient, and the surface was smooth.

As shown in Figure 8(d) and (e), the chemical strengthening increased the density of the RAC microstructure. The C–S–H gel generated by NS particles consuming Ca(OH)2 in the ITZ can fill the pores on the surface and make the mortar matrix denser [37]. Floccule C–S–H gelled and overlapped to form a network structure with different CH crystal shapes. In addition, acicular ettringite (AFt) was distributed in the holes, and the ITZ had good bonding properties [42]. Vibration mixing was conducive to promoting the hydration process of cement and increasing the amount of C–S–H cementing [43]. The bonding force of the mortar matrix was strengthened, and the ITZ properties were improved. The mortar matrix was closely composite with the RCA, with a small number of microcracks and fewer holes. Also, with the soaking of NS solution, the bonding force of the mortar matrix can be strengthened further, and the internal defects of RAC will be reduced [44–46].

5 Cost analysis of NS solution

At present, the price of NS is higher than other materials in the method of modifying concrete [47–51]. There is some limitation to the application of NS in RCA soaking. Due to the high cost of the NS solution at present [18], the NS solution used for soaking RCA was recycled and used in the next round of soaking to reduce test and production costs. For example, when soaked in 1% concentration, there were still a large amount of NS particles in the solution. Assuming that the solution was homogeneous, the residual amount of the NS solution after soaking was 80%, and the concentration of the NS solution remained unchanged. An appropriate amount of NS solution and water can be added to the recovered solution, and the solution with a concentration of 2% can be continuously configured. The costs are shown in Table 4. In later studies, some tap water can also be replaced with a residual solution during RAC production [14]. The improvement effect of this method on the mechanical properties of RAC can be studied to improve the quality of RAC [52].

Table 4:

Price of the RCA soaked in NS solution

Solution concentration (%) Water (kg/m3) RCA (kg/m3) Price of NS (kg) NS (surplus + supplement) (kg/m3) Total price of NS solution
0 690.78 1151.3 $13 \ \
1 690.78 1151.3 $13 0 + 6.97 $90.61
2 690.78 1151.3 $13 5.57 + 8.51 +$110.63
3 690.78 1151.3 $13 11.27 + 8.08 +$146.51

6 Conclusions and future perspectives

6.1 Conclusions

The improvements in the mechanical properties of RAC due to physical slurry removal, soaking in NS solutions with different concentrations for different amounts of time, and vibration stirring was systematically studied. Using SEM, the effects of the different strengthening methods on the RAC microstructure were analyzed. The following conclusions were drawn:

  1. The water-absorption rate and crushing index of the RCA were improved by physical slurry removal. The water-absorption rate was reduced by 32.9%, and the crushing index was increased by 23.9%.

  2. Nano-solution strengthening can fill the microcracks and pores in RCA and RAC and effectively improve the mechanical properties of RAC – particularly the early strength. In this study, the optimal improvement was achieved when the concentration was 2% and the soaking time was two days; the 28-day compressive strength, splitting tensile strength, and flexural strength was increased by 24.3, 18.2, and 39.1%, respectively.

  3. Vibration stirring can effectively improve the internal microstructure of RAC, increase the compactness of RAC, and reduce the number of cracks and pores. The 28 day compressive strength, splitting tensile strength, and the flexural strength of the optimal group was increased by 5.6, 4, and 10.6%, respectively.

  4. The mechanical properties of RAC can be effectively improved by the combination of physical slurry removal, NS solution treatment, and vibration stirring. The 28 day compressive strength increased by 31.3%, the splitting tensile strength increased by 23%, and the flexural strength increased by 49%.

  5. Physical slurry removal, NS solution soaking, and vibration stirring reduced the number of internal microcracks, increased the density of the RAC, improved the structure of the ITZ, and improved the strength of the RAC.

6.2 Future perspectives

Overall, this study confirmed that the NS solution modified RCA is promising for engineering applications with desirable mechanical properties. However, there are still some shortcomings in this study:

  1. The modification effect of the NS solution on RCA from various sources needs to be studied.

  2. Different nano-solutions can be used to improve the RCA, and the best nano-solution can be obtained.

  3. The durability of RAC strengthened by NS solution needs to be studied.

  1. Funding information: The authors would like to acknowledge the financial support received from National Natural Science Foundation of China (Grant No. 51878623, U2040224), Key Research and Development and Promotion Special Project of Henan Province in 2020 (Key Science and Technology Tack) (Grant No.202102310241), Young Key Teachers of Colleges and Universities in Henan Province (Grant No.2018GGJS005), Natural Science Foundation of Henan (Grant No. 212300410018), Foundation for University Key Teacher by Henan Province of China (2019GGJS009), and Program for Innovative Research Team (in Science and Technology) in University of Henan Province of China (Grant No. 20IRTSTHN009).

  2. Author contributions: All authors have accepted responsibility for the entire content of this manuscript and approved its submission.

  3. Conflict of interest: The authors state no conflict of interest.

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Received: 2022-01-09
Revised: 2022-02-09
Accepted: 2022-02-16
Published Online: 2022-04-04

© 2022 Yuanxun Zheng et al., published by De Gruyter

This work is licensed under the Creative Commons Attribution 4.0 International License.

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https://doi.org/10.1515/ntrev-2022-0077
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recycled coarse aggregate; nano-SiO2; mechanical strengthening; compound strengthening; mechanical properties; microstructure
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Artikel in diesem Heft

  1. Research Articles
  2. Theoretical and experimental investigation of MWCNT dispersion effect on the elastic modulus of flexible PDMS/MWCNT nanocomposites
  3. Mechanical, morphological, and fracture-deformation behavior of MWCNTs-reinforced (Al–Cu–Mg–T351) alloy cast nanocomposites fabricated by optimized mechanical milling and powder metallurgy techniques
  4. Flammability and physical stability of sugar palm crystalline nanocellulose reinforced thermoplastic sugar palm starch/poly(lactic acid) blend bionanocomposites
  5. Glutathione-loaded non-ionic surfactant niosomes: A new approach to improve oral bioavailability and hepatoprotective efficacy of glutathione
  6. Relationship between mechano-bactericidal activity and nanoblades density on chemically strengthened glass
  7. In situ regulation of microstructure and microwave-absorbing properties of FeSiAl through HNO3 oxidation
  8. Research on a mechanical model of magnetorheological fluid different diameter particles
  9. Nanomechanical and dynamic mechanical properties of rubber–wood–plastic composites
  10. Investigative properties of CeO2 doped with niobium: A combined characterization and DFT studies
  11. Miniaturized peptidomimetics and nano-vesiculation in endothelin types through probable nano-disk formation and structure property relationships of endothelins’ fragments
  12. N/S co-doped CoSe/C nanocubes as anode materials for Li-ion batteries
  13. Synergistic effects of halloysite nanotubes with metal and phosphorus additives on the optimal design of eco-friendly sandwich panels with maximum flame resistance and minimum weight
  14. Octreotide-conjugated silver nanoparticles for active targeting of somatostatin receptors and their application in a nebulized rat model
  15. Controllable morphology of Bi2S3 nanostructures formed via hydrothermal vulcanization of Bi2O3 thin-film layer and their photoelectrocatalytic performances
  16. Development of (−)-epigallocatechin-3-gallate-loaded folate receptor-targeted nanoparticles for prostate cancer treatment
  17. Enhancement of the mechanical properties of HDPE mineral nanocomposites by filler particles modulation of the matrix plastic/elastic behavior
  18. Effect of plasticizers on the properties of sugar palm nanocellulose/cinnamon essential oil reinforced starch bionanocomposite films
  19. Optimization of nano coating to reduce the thermal deformation of ball screws
  20. Preparation of efficient piezoelectric PVDF–HFP/Ni composite films by high electric field poling
  21. MHD dissipative Casson nanofluid liquid film flow due to an unsteady stretching sheet with radiation influence and slip velocity phenomenon
  22. Effects of nano-SiO2 modification on rubberised mortar and concrete with recycled coarse aggregates
  23. Mechanical and microscopic properties of fiber-reinforced coal gangue-based geopolymer concrete
  24. Effect of morphology and size on the thermodynamic stability of cerium oxide nanoparticles: Experiment and molecular dynamics calculation
  25. Mechanical performance of a CFRP composite reinforced via gelatin-CNTs: A study on fiber interfacial enhancement and matrix enhancement
  26. A practical review over surface modification, nanopatterns, emerging materials, drug delivery systems, and their biophysiochemical properties for dental implants: Recent progresses and advances
  27. HTR: An ultra-high speed algorithm for cage recognition of clathrate hydrates
  28. Effects of microalloying elements added by in situ synthesis on the microstructure of WCu composites
  29. A highly sensitive nanobiosensor based on aptamer-conjugated graphene-decorated rhodium nanoparticles for detection of HER2-positive circulating tumor cells
  30. Progressive collapse performance of shear strengthened RC frames by nano CFRP
  31. Core–shell heterostructured composites of carbon nanotubes and imine-linked hyperbranched polymers as metal-free Li-ion anodes
  32. A Galerkin strategy for tri-hybridized mixture in ethylene glycol comprising variable diffusion and thermal conductivity using non-Fourier’s theory
  33. Simple models for tensile modulus of shape memory polymer nanocomposites at ambient temperature
  34. Preparation and morphological studies of tin sulfide nanoparticles and use as efficient photocatalysts for the degradation of rhodamine B and phenol
  35. Polyethyleneimine-impregnated activated carbon nanofiber composited graphene-derived rice husk char for efficient post-combustion CO2 capture
  36. Electrospun nanofibers of Co3O4 nanocrystals encapsulated in cyclized-polyacrylonitrile for lithium storage
  37. Pitting corrosion induced on high-strength high carbon steel wire in high alkaline deaerated chloride electrolyte
  38. Formulation of polymeric nanoparticles loaded sorafenib; evaluation of cytotoxicity, molecular evaluation, and gene expression studies in lung and breast cancer cell lines
  39. Engineered nanocomposites in asphalt binders
  40. Influence of loading voltage, domain ratio, and additional load on the actuation of dielectric elastomer
  41. Thermally induced hex-graphene transitions in 2D carbon crystals
  42. The surface modification effect on the interfacial properties of glass fiber-reinforced epoxy: A molecular dynamics study
  43. Molecular dynamics study of deformation mechanism of interfacial microzone of Cu/Al2Cu/Al composites under tension
  44. Nanocolloid simulators of luminescent solar concentrator photovoltaic windows
  45. Compressive strength and anti-chloride ion penetration assessment of geopolymer mortar merging PVA fiber and nano-SiO2 using RBF–BP composite neural network
  46. Effect of 3-mercapto-1-propane sulfonate sulfonic acid and polyvinylpyrrolidone on the growth of cobalt pillar by electrodeposition
  47. Dynamics of convective slippery constraints on hybrid radiative Sutterby nanofluid flow by Galerkin finite element simulation
  48. Preparation of vanadium by the magnesiothermic self-propagating reduction and process control
  49. Microstructure-dependent photoelectrocatalytic activity of heterogeneous ZnO–ZnS nanosheets
  50. Cytotoxic and pro-inflammatory effects of molybdenum and tungsten disulphide on human bronchial cells
  51. Improving recycled aggregate concrete by compression casting and nano-silica
  52. Chemically reactive Maxwell nanoliquid flow by a stretching surface in the frames of Newtonian heating, nonlinear convection and radiative flux: Nanopolymer flow processing simulation
  53. Nonlinear dynamic and crack behaviors of carbon nanotubes-reinforced composites with various geometries
  54. Biosynthesis of copper oxide nanoparticles and its therapeutic efficacy against colon cancer
  55. Synthesis and characterization of smart stimuli-responsive herbal drug-encapsulated nanoniosome particles for efficient treatment of breast cancer
  56. Homotopic simulation for heat transport phenomenon of the Burgers nanofluids flow over a stretching cylinder with thermal convective and zero mass flux conditions
  57. Incorporation of copper and strontium ions in TiO2 nanotubes via dopamine to enhance hemocompatibility and cytocompatibility
  58. Mechanical, thermal, and barrier properties of starch films incorporated with chitosan nanoparticles
  59. Mechanical properties and microstructure of nano-strengthened recycled aggregate concrete
  60. Glucose-responsive nanogels efficiently maintain the stability and activity of therapeutic enzymes
  61. Tunning matrix rheology and mechanical performance of ultra-high performance concrete using cellulose nanofibers
  62. Flexible MXene/copper/cellulose nanofiber heat spreader films with enhanced thermal conductivity
  63. Promoted charge separation and specific surface area via interlacing of N-doped titanium dioxide nanotubes on carbon nitride nanosheets for photocatalytic degradation of Rhodamine B
  64. Elucidating the role of silicon dioxide and titanium dioxide nanoparticles in mitigating the disease of the eggplant caused by Phomopsis vexans, Ralstonia solanacearum, and root-knot nematode Meloidogyne incognita
  65. An implication of magnetic dipole in Carreau Yasuda liquid influenced by engine oil using ternary hybrid nanomaterial
  66. Robust synthesis of a composite phase of copper vanadium oxide with enhanced performance for durable aqueous Zn-ion batteries
  67. Tunning self-assembled phases of bovine serum albumin via hydrothermal process to synthesize novel functional hydrogel for skin protection against UVB
  68. A comparative experimental study on damping properties of epoxy nanocomposite beams reinforced with carbon nanotubes and graphene nanoplatelets
  69. Lightweight and hydrophobic Ni/GO/PVA composite aerogels for ultrahigh performance electromagnetic interference shielding
  70. Research on the auxetic behavior and mechanical properties of periodically rotating graphene nanostructures
  71. Repairing performances of novel cement mortar modified with graphene oxide and polyacrylate polymer
  72. Closed-loop recycling and fabrication of hydrophilic CNT films with high performance
  73. Design of thin-film configuration of SnO2–Ag2O composites for NO2 gas-sensing applications
  74. Study on stress distribution of SiC/Al composites based on microstructure models with microns and nanoparticles
  75. PVDF green nanofibers as potential carriers for improving self-healing and mechanical properties of carbon fiber/epoxy prepregs
  76. Osteogenesis capability of three-dimensionally printed poly(lactic acid)-halloysite nanotube scaffolds containing strontium ranelate
  77. Silver nanoparticles induce mitochondria-dependent apoptosis and late non-canonical autophagy in HT-29 colon cancer cells
  78. Preparation and bonding mechanisms of polymer/metal hybrid composite by nano molding technology
  79. Damage self-sensing and strain monitoring of glass-reinforced epoxy composite impregnated with graphene nanoplatelet and multiwalled carbon nanotubes
  80. Thermal analysis characterisation of solar-powered ship using Oldroyd hybrid nanofluids in parabolic trough solar collector: An optimal thermal application
  81. Pyrene-functionalized halloysite nanotubes for simultaneously detecting and separating Hg(ii) in aqueous media: A comprehensive comparison on interparticle and intraparticle excimers
  82. Fabrication of self-assembly CNT flexible film and its piezoresistive sensing behaviors
  83. Thermal valuation and entropy inspection of second-grade nanoscale fluid flow over a stretching surface by applying Koo–Kleinstreuer–Li relation
  84. Mechanical properties and microstructure of nano-SiO2 and basalt-fiber-reinforced recycled aggregate concrete
  85. Characterization and tribology performance of polyaniline-coated nanodiamond lubricant additives
  86. Combined impact of Marangoni convection and thermophoretic particle deposition on chemically reactive transport of nanofluid flow over a stretching surface
  87. Spark plasma extrusion of binder free hydroxyapatite powder
  88. An investigation on thermo-mechanical performance of graphene-oxide-reinforced shape memory polymer
  89. Effect of nanoadditives on the novel leather fiber/recycled poly(ethylene-vinyl-acetate) polymer composites for multifunctional applications: Fabrication, characterizations, and multiobjective optimization using central composite design
  90. Design selection for a hemispherical dimple core sandwich panel using hybrid multi-criteria decision-making methods
  91. Improving tensile strength and impact toughness of plasticized poly(lactic acid) biocomposites by incorporating nanofibrillated cellulose
  92. Green synthesis of spinel copper ferrite (CuFe2O4) nanoparticles and their toxicity
  93. The effect of TaC and NbC hybrid and mono-nanoparticles on AA2024 nanocomposites: Microstructure, strengthening, and artificial aging
  94. Excited-state geometry relaxation of pyrene-modified cellulose nanocrystals under UV-light excitation for detecting Fe3+
  95. Effect of CNTs and MEA on the creep of face-slab concrete at an early age
  96. Effect of deformation conditions on compression phase transformation of AZ31
  97. Application of MXene as a new generation of highly conductive coating materials for electromembrane-surrounded solid-phase microextraction
  98. A comparative study of the elasto-plastic properties for ceramic nanocomposites filled by graphene or graphene oxide nanoplates
  99. Encapsulation strategies for improving the biological behavior of CdS@ZIF-8 nanocomposites
  100. Biosynthesis of ZnO NPs from pumpkin seeds’ extract and elucidation of its anticancer potential against breast cancer
  101. Preliminary trials of the gold nanoparticles conjugated chrysin: An assessment of anti-oxidant, anti-microbial, and in vitro cytotoxic activities of a nanoformulated flavonoid
  102. Effect of micron-scale pores increased by nano-SiO2 sol modification on the strength of cement mortar
  103. Fractional simulations for thermal flow of hybrid nanofluid with aluminum oxide and titanium oxide nanoparticles with water and blood base fluids
  104. The effect of graphene nano-powder on the viscosity of water: An experimental study and artificial neural network modeling
  105. Development of a novel heat- and shear-resistant nano-silica gelling agent
  106. Characterization, biocompatibility and in vivo of nominal MnO2-containing wollastonite glass-ceramic
  107. Entropy production simulation of second-grade magnetic nanomaterials flowing across an expanding surface with viscidness dissipative flux
  108. Enhancement in structural, morphological, and optical properties of copper oxide for optoelectronic device applications
  109. Aptamer-functionalized chitosan-coated gold nanoparticle complex as a suitable targeted drug carrier for improved breast cancer treatment
  110. Performance and overall evaluation of nano-alumina-modified asphalt mixture
  111. Analysis of pure nanofluid (GO/engine oil) and hybrid nanofluid (GO–Fe3O4/engine oil): Novel thermal and magnetic features
  112. Synthesis of Ag@AgCl modified anatase/rutile/brookite mixed phase TiO2 and their photocatalytic property
  113. Mechanisms and influential variables on the abrasion resistance hydraulic concrete
  114. Synergistic reinforcement mechanism of basalt fiber/cellulose nanocrystals/polypropylene composites
  115. Achieving excellent oxidation resistance and mechanical properties of TiB2–B4C/carbon aerogel composites by quick-gelation and mechanical mixing
  116. Microwave-assisted sol–gel template-free synthesis and characterization of silica nanoparticles obtained from South African coal fly ash
  117. Pulsed laser-assisted synthesis of nano nickel(ii) oxide-anchored graphitic carbon nitride: Characterizations and their potential antibacterial/anti-biofilm applications
  118. Effects of nano-ZrSi2 on thermal stability of phenolic resin and thermal reusability of quartz–phenolic composites
  119. Benzaldehyde derivatives on tin electroplating as corrosion resistance for fabricating copper circuit
  120. Mechanical and heat transfer properties of 4D-printed shape memory graphene oxide/epoxy acrylate composites
  121. Coupling the vanadium-induced amorphous/crystalline NiFe2O4 with phosphide heterojunction toward active oxygen evolution reaction catalysts
  122. Graphene-oxide-reinforced cement composites mechanical and microstructural characteristics at elevated temperatures
  123. Gray correlation analysis of factors influencing compressive strength and durability of nano-SiO2 and PVA fiber reinforced geopolymer mortar
  124. Preparation of layered gradient Cu–Cr–Ti alloy with excellent mechanical properties, thermal stability, and electrical conductivity
  125. Recovery of Cr from chrome-containing leather wastes to develop aluminum-based composite material along with Al2O3 ceramic particles: An ingenious approach
  126. Mechanisms of the improved stiffness of flexible polymers under impact loading
  127. Anticancer potential of gold nanoparticles (AuNPs) using a battery of in vitro tests
  128. Review Articles
  129. Proposed approaches for coronaviruses elimination from wastewater: Membrane techniques and nanotechnology solutions
  130. Application of Pickering emulsion in oil drilling and production
  131. The contribution of microfluidics to the fight against tuberculosis
  132. Graphene-based biosensors for disease theranostics: Development, applications, and recent advancements
  133. Synthesis and encapsulation of iron oxide nanorods for application in magnetic hyperthermia and photothermal therapy
  134. Contemporary nano-architectured drugs and leads for ανβ3 integrin-based chemotherapy: Rationale and retrospect
  135. State-of-the-art review of fabrication, application, and mechanical properties of functionally graded porous nanocomposite materials
  136. Insights on magnetic spinel ferrites for targeted drug delivery and hyperthermia applications
  137. A review on heterogeneous oxidation of acetaminophen based on micro and nanoparticles catalyzed by different activators
  138. Early diagnosis of lung cancer using magnetic nanoparticles-integrated systems
  139. Advances in ZnO: Manipulation of defects for enhancing their technological potentials
  140. Efficacious nanomedicine track toward combating COVID-19
  141. A review of the design, processes, and properties of Mg-based composites
  142. Green synthesis of nanoparticles for varied applications: Green renewable resources and energy-efficient synthetic routes
  143. Two-dimensional nanomaterial-based polymer composites: Fundamentals and applications
  144. Recent progress and challenges in plasmonic nanomaterials
  145. Apoptotic cell-derived micro/nanosized extracellular vesicles in tissue regeneration
  146. Electronic noses based on metal oxide nanowires: A review
  147. Framework materials for supercapacitors
  148. An overview on the reproductive toxicity of graphene derivatives: Highlighting the importance
  149. Antibacterial nanomaterials: Upcoming hope to overcome antibiotic resistance crisis
  150. Research progress of carbon materials in the field of three-dimensional printing polymer nanocomposites
  151. A review of atomic layer deposition modelling and simulation methodologies: Density functional theory and molecular dynamics
  152. Recent advances in the preparation of PVDF-based piezoelectric materials
  153. Recent developments in tensile properties of friction welding of carbon fiber-reinforced composite: A review
  154. Comprehensive review of the properties of fly ash-based geopolymer with additive of nano-SiO2
  155. Perspectives in biopolymer/graphene-based composite application: Advances, challenges, and recommendations
  156. Graphene-based nanocomposite using new modeling molecular dynamic simulations for proposed neutralizing mechanism and real-time sensing of COVID-19
  157. Nanotechnology application on bamboo materials: A review
  158. Recent developments and future perspectives of biorenewable nanocomposites for advanced applications
  159. Nanostructured lipid carrier system: A compendium of their formulation development approaches, optimization strategies by quality by design, and recent applications in drug delivery
  160. 3D printing customized design of human bone tissue implant and its application
  161. Design, preparation, and functionalization of nanobiomaterials for enhanced efficacy in current and future biomedical applications
  162. A brief review of nanoparticles-doped PEDOT:PSS nanocomposite for OLED and OPV
  163. Nanotechnology interventions as a putative tool for the treatment of dental afflictions
  164. Recent advancements in metal–organic frameworks integrating quantum dots (QDs@MOF) and their potential applications
  165. A focused review of short electrospun nanofiber preparation techniques for composite reinforcement
  166. Microstructural characteristics and nano-modification of interfacial transition zone in concrete: A review
  167. Latest developments in the upconversion nanotechnology for the rapid detection of food safety: A review
  168. Strategic applications of nano-fertilizers for sustainable agriculture: Benefits and bottlenecks
  169. Molecular dynamics application of cocrystal energetic materials: A review
  170. Synthesis and application of nanometer hydroxyapatite in biomedicine
  171. Cutting-edge development in waste-recycled nanomaterials for energy storage and conversion applications
  172. Biological applications of ternary quantum dots: A review
  173. Nanotherapeutics for hydrogen sulfide-involved treatment: An emerging approach for cancer therapy
  174. Application of antibacterial nanoparticles in orthodontic materials
  175. Effect of natural-based biological hydrogels combined with growth factors on skin wound healing
  176. Nanozymes – A route to overcome microbial resistance: A viewpoint
  177. Recent developments and applications of smart nanoparticles in biomedicine
  178. Contemporary review on carbon nanotube (CNT) composites and their impact on multifarious applications
  179. Interfacial interactions and reinforcing mechanisms of cellulose and chitin nanomaterials and starch derivatives for cement and concrete strength and durability enhancement: A review
  180. Diamond-like carbon films for tribological modification of rubber
  181. Layered double hydroxides (LDHs) modified cement-based materials: A systematic review
  182. Recent research progress and advanced applications of silica/polymer nanocomposites
  183. Modeling of supramolecular biopolymers: Leading the in silico revolution of tissue engineering and nanomedicine
  184. Recent advances in perovskites-based optoelectronics
  185. Biogenic synthesis of palladium nanoparticles: New production methods and applications
  186. A comprehensive review of nanofluids with fractional derivatives: Modeling and application
  187. Electrospinning of marine polysaccharides: Processing and chemical aspects, challenges, and future prospects
  188. Electrohydrodynamic printing for demanding devices: A review of processing and applications
  189. Rapid Communications
  190. Structural material with designed thermal twist for a simple actuation
  191. Recent advances in photothermal materials for solar-driven crude oil adsorption
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Heruntergeladen am 24.10.2025 von https://www.degruyterbrill.com/document/doi/10.1515/ntrev-2022-0077/html
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