Startseite Technik Microstructure and pore fractal dimensions of recycled thermal insulation concrete
Artikel
Lizenziert
Nicht lizenziert Erfordert eine Authentifizierung

Microstructure and pore fractal dimensions of recycled thermal insulation concrete

  • Lin Zhao , Wenjing Wang , Zhu Li und Y. Frank Chen
Veröffentlicht/Copyright: 27. März 2015
Veröffentlichen auch Sie bei De Gruyter Brill

Abstract

The compressive strength and thermal conductivity of recycled thermal insulation nano concrete with different contents of recycled aggregates were determined. By comparing the micro morphology, it was concluded that the glazed hollow beads, rather than air pores, reduced the strength loss of concrete. This was due to the tight adherence between the glazed hollow beads and the cement mortar, which is more effective than foaming the pores to strengthen concrete by lowering the thermal conductivity. Finally, the pore fractal dimension was established by mercury injection test data. The correlations between fractal dimensions under various recycled aggregate replacement rates and compressive strength/thermal conductivity were compared, and it was discovered that the macro pore fractal dimensions could be used to characterize the changes of concrete strengths and that the average fractal dimension could be employed to describe the variations of thermal conductivity of concrete.

Kurzfassung

In dieser Studie wurden die Druckfestigkeit und die Wärmeleitfähigkeit von recyceltem Wärmeschutz-Nano-Beton mit verschiedenen Anteilen an recycelten Zuschlägen bestimmt. Durch den Vergleich der Mikromorphologie zeigte sich, dass die glasierten Hohlkügelchen eher den Festigkeitsverlust des Betons reduzierten als die Luftporen. Dies stellte sich durch die starke Haftfestigkeit zwischen den glasierten Hohlkügelchen und dem Zementmörtel ein, die wirkungsvoller ist als vergleichsweise der betonstabilisierende Effekt mittels Aufschäumung der Poren, wodurch die Wärmeleitfähigkeit vermindert wird. Zudem wurde die fraktale Porenausdehnung mit Hilfe von Quecksilber-Injektions-Messdaten festgestellt. Die Abhängigkeiten zwischen fraktaler Ausdehnung bei unterschiedlichen Recycling-Zuschlagsanteilen und Druckfestigkeit bzw. Wärmeleitfähigkeit wurden verglichen und so wurde heraus gefunden, dass die fraktalen Ausdehnungen der Makroporen zur Charakterisierung der Veränderungen der Betonfestigkeit verwendet werden können. Außerdem kann die durchschnittliche fraktale Ausdehnung zur Beschreibung der Abweichungen der Betonwärmeleitfähigkeit benutzt werden.


§Correspondence Address, Prof. Dr. Zhu Li, Department of Civil Engineering, Taiyuan University of Technology, No. 79, Yingze West Main Street, Taiyuan, Shanxi Province, P. R. China, E-mail:

Lin Zhao, born in 1985, is PhD Candidate at Taiyuan University of Technology, P. R. China. He obtained the Graduate degree in Structural Engineering from the same university in 2010. His study focuses on the building energy saving and thermal insulation properties of concrete.

Wenjing Wang, born in 1987, received her PhD from Taiyuan University of Technology, P. R. China. She obtained the Doctor degree in Structural Engineering from the same university in 2014. Her primary research area is energy saving building materials.

Zhu Li, born in 1959, is Professor at Taiyuan University of Technology, P. R. China. He obtained his PhD degree in Solid Mechanics from the same university in 2000. His primary research area is structural engineering and energy efficient building.

Y. Frank Chen, born in 1956, is currently tenured Professor at the Pennsylvania State University, Middletown, USA and distinguished Professor of Taiyuan University of Technology, P. R. China. He obtained his PhD degree from the University of Minnesota, USA in 1988. Dr. Chen is specialized in dynamic soil structure interaction, computational methods, limit states design and mitigation for civil infrastructure.


References

1 Z.Li: Studies on thermal insulation materials – glazed hollow beads and green architecture of city cave-house, Beijing University of Posts and Telecommunications Press, Beijing, P. R. China (2011), pp. 99106 (in Chinese)Suche in Google Scholar

2 Z. P.Zhang, L. J.Fan, Z.Li, Y. J.Wang: Thermal insulation glazed hollow bead concrete is explored for the first time, Concrete11 (2007), pp. 4648 (in Chinese)Suche in Google Scholar

3 Y. P.Wei, P.Shi, Z. P.Zhang, Z.Li: Study on elasticity modulus of thermal insulation glazed hollow bead concrete, China Concrete and Cement Products2 (2010), pp. 7577 (in Chinese)Suche in Google Scholar

4 Y. L.Chai, Z. Q.Song, Z.Li, L.Zhao: Study on the working performance of glazed hollow bead insulation concrete, Construction Technology42 (2013), pp. 8387 (in Chinese)Suche in Google Scholar

5 Y. Z.Liu, X. H.Zheng, Z.Li, L.Xu, S. S.Qin: Experimental study on frost resistance of vitrified microsphere bearing and insulation concrete, Construction Technology9 (2013), pp. 8385 (in Chinese)Suche in Google Scholar

6 H. X.Cai, Z. P.Zhang, Z.Li: Technical and conomic evaluation for glazed hollow bead thermal insulation concrete, China Concrete and Cement Products5 (2009), pp. 5658 (in Chinese)Suche in Google Scholar

7 J. B.Li, J. Z.Xiao, J.Huang: Influence of recycled coarse aggregate replacement percentage on compressive strength of concrete, Journal of Building Materials9 (2006), pp. 297301Suche in Google Scholar

8 C. K.Shi, S. P.Chi, A.Francisco: Comparisons of natural and recycled aggregate concretes prepared with the addition of different mineral admixtures, Cement & Concrete Composites33 (2011), pp. 78879510.1016/j.cemconcomp.2011.05.009Suche in Google Scholar

9 L.Qiong, J. Z.Xiao, Z. H.Sun: Experimental study on the failure mechanism of recycled concrete, Cement and Concrete Research41 (2011), pp. 1050105710.1016/j.cemconres.2011.06.007Suche in Google Scholar

10 M.Casuccio, M. C.Torrijos, G.Giaccio, R.Zerbino: Failure mechanism of recycled aggregate concrete, Construction and Building Materials22 (2008), pp. 1500150610.1016/j.conbuildmat.2007.03.032Suche in Google Scholar

11 M.Etxeberria, E.Vázquez, A.Marí, M.Barra: Influence of amount of recycled coarse aggregates and production process on properties of recycled aggregate concrete, Cement and Concrete Research37 (2007), pp. 73574210.1016/j.cemconres.2007.02.002Suche in Google Scholar

12 S. C.Kou, C. S.Poon, M.Etxeberria: Influence of recycled aggregates on long-term mechanical properties and pore size distribution of concrete, Cement & Concrete Composites33 (2011), pp. 28629110.1016/j.cemconcomp.2010.10.003Suche in Google Scholar

13 S. W.Tabsh, A. S.Abdelfatah: Influence of recycled concrete aggregates on strength properties of concrete, Construction and Building Materials23 (2009), pp. 1163116710.1016/j.conbuildmat.2008.06.007Suche in Google Scholar

14 V.Corinaldesi: Mechanical and elastic behaviour of concretes made of recycled-concrete coarse aggregates, Construction and Building Materials24 (2010), pp. 1616162010.1016/j.conbuildmat.2010.02.031Suche in Google Scholar

15 L.Evangelista, J.de Brito: Mechanical behaviour of concrete made with fine recycled concrete aggregates, Cement & Concrete Composites29 (2007), pp. 39740110.1016/j.cemconcomp.2006.12.004Suche in Google Scholar

16 J. Z.Xiao, Y. J.Huang, J.Yang, C.Zhang: Mechanical properties of confined recycled aggregate concrete under axial compression, Construction and Building Materials26 (2012), pp. 59160310.1016/j.conbuildmat.2011.06.062Suche in Google Scholar

17 J. Z.Xiao, J. B.Li, C.Zhang: Mechanical properties of recycled aggregate concrete under uniaxial loading, Cement and Concrete Research35 (2005), pp. 1187119410.1016/j.cemconres.2004.09.020Suche in Google Scholar

18 J. Z.Xiao, Y. D.Sun, H.Falkner: Seismic performance of frame structures with recycled aggregate concrete, Engineering Structures28 (2006), pp. 1810.1016/j.engstruct.2005.06.019Suche in Google Scholar

19 R.Demirboğa, R.Gül: The effect of expanded perlite aggregate, silica fume and fly ash on the thermal conductivity of lightweight concrete, Cement and Concrete Research33 (2003), pp. 72372710.1016/S0008-8846(02)01032-3Suche in Google Scholar

20 J. Z.Xiao: An overview of study on recycled aggregate concrete in China (1996–2011), Construction and Building Materials31 (2012), pp. 36438310.1016/j.conbuildmat.2011.12.074Suche in Google Scholar

21 Technical specification for application of recycled aggregate (JGJ/T 240-2011), China Architecture and Building Press, Beijing, P. R. China (2011), pp. 512 (in Chinese)Suche in Google Scholar

22 W. J.Wang, L.Zhao, Y. Z.Liu, Z.Li: Mix design for recycled aggregate thermal insulation concrete with mineral admixtures, Magazine of Concrete Research66 (2014), pp. 49250410.1680/macr.13.00335Suche in Google Scholar

23 Standard test method of mechanical properties on ordinary concrete (GB/T 50081-2002), China Architecture and Building Press, Beijing, P. R. China (2002) (in Chinese)Suche in Google Scholar

24 Thermal insulation determination of steady-state thermal resistance and related properties – heat flow meter apparatus (GB/T 10295-2008), China Architecture and Building Press, Beijing, P. R. China (2008) (in Chinese)Suche in Google Scholar

25 J. Z.Xiao, Z. W.Song, F.Zhang: An experimental study on thermal conductivity of concrete, Journal of Building Materials13 (2010), pp. 172110.3969/j.issn.1007-9629.2010.01.004Suche in Google Scholar

26 W. J.Wang, Z.Li, L.Zhao, X. Q.Bai, Y.Zhang, G.Ma: Influence factors to the workability of thermal insulation glazed hollow bead concrete and mix design using the orthogonal design method, The 12th International Symposium on Structural Engineering, Beijing Science Press, Beijing, P. R. China (2012), pp. 514520Suche in Google Scholar

27 P. K.Mehta: Concrete – Microstructure, Properties and Materials, China Electric Power Press, Beijing, P. R. China (2008)Suche in Google Scholar

28 B.Zhang, S.Li: Determination of the surface fractal dimension for porous media by mercury porosimetry, Industrial & Engineering Chemistry Research34 (1995), pp. 1383138610.1021/ie00043a044Suche in Google Scholar

29 B.Zhang, W.Liu, X.Liu: Scale-dependent nature of the surface fractal dimension for bi- and multi-disperse porous solids by mercury porosimetry, Applied Surface Science253 (2006), pp. 1349135510.1016/j.apsusc.2006.02.009Suche in Google Scholar

30 Q.Zeng, K.Li, T.Fen-Chong, P.Dangla: Surface fractal analysis of pore structure of high-volume fly-ash cement pastes, Applied Surface Science257 (2010), pp. 76276810.1016/j.apsusc.2010.07.061Suche in Google Scholar

31 D. N.Winslow: Fractal character in cement and concrete, Cement and Concrete Research15 (1985), pp. 81782410.1016/0008-8846(85)90148-6Suche in Google Scholar

32 S. P.Pandey, R. L.Sharma: The influence of mineral additives on strength and porosity of OPC mortar, Cement and Concrete Research30 (2000), pp. 192310.1016/S0008-8846(99)00180-5Suche in Google Scholar

33 J. X.Wei, Q. J.Yu, X. X.Zeng: Fractal dimension of pore structure of concrete, Journal of South China University of Technology (Natural Science Edition)35 (2007), pp. 121124Suche in Google Scholar

Published Online: 2015-03-27
Published in Print: 2015-04-01

© 2015, Carl Hanser Verlag, München

Artikel in diesem Heft

  1. Inhalt/Contents
  2. Inhalt
  3. Fachbeiträge/Technical Contributions
  4. Influence of the production process on the deformation and fatigue performance of friction drilled internal threads in the aluminum alloy 6060*
  5. Effect of quench and strain aging on the mechanical properties of low carbon microalloyed steels
  6. Effect of temperature on microstructure and mechanical behavior of diffusion bonded Armor 500 and AISI 1040 steels
  7. Analysis of industrial conditions during multi-stage cooling of C70D high-carbon steel wire rod
  8. Effect of cryogenic treatment on the microstructure and wear behavior of a T-42 tool steel
  9. Application of the response surface methodology in the ball burnishing process for the prediction and analysis of surface hardness of the aluminum alloy AA 7075
  10. The memory effect in polyolefinic products: A tool for confirming the steam sterilization process
  11. Neutron tomography in archaeology*
  12. Ultraschallprüfung von Betonbauteilen – laufzeitgesteuerte Gruppenstrahler mit Punktkontaktprüfköpfen
  13. Acoustic emission testing of surface roughness and wear caused by grinding of ceramic materials
  14. Electrochemical impedance spectroscopy of hardened compacted cemented soils at early curing stage
  15. Microstructure and pore fractal dimensions of recycled thermal insulation concrete
  16. Microstructure and tribological properties of electrolytic plasma nitrided high-speed steel
  17. Exploitation of limestone in brick making
  18. Effect of alkaline treatment on physico-mechanical properties of black rice husk ash filled polypropylene biocomposites
  19. Kalender/Calendar
  20. Kalender
Heruntergeladen am 6.3.2026 von https://www.degruyterbrill.com/document/doi/10.3139/120.110713/html
Button zum nach oben scrollen