Microstructure and pore fractal dimensions of recycled thermal insulation concrete
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Lin Zhao
, Wenjing Wang , Zhu Li und Y. Frank Chen
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.
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- Microstructure and tribological properties of electrolytic plasma nitrided high-speed steel
- Exploitation of limestone in brick making
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- Kalender/Calendar
- Kalender
Artikel in diesem Heft
- Inhalt/Contents
- Inhalt
- Fachbeiträge/Technical Contributions
- Influence of the production process on the deformation and fatigue performance of friction drilled internal threads in the aluminum alloy 6060*
- Effect of quench and strain aging on the mechanical properties of low carbon microalloyed steels
- Effect of temperature on microstructure and mechanical behavior of diffusion bonded Armor 500 and AISI 1040 steels
- Analysis of industrial conditions during multi-stage cooling of C70D high-carbon steel wire rod
- Effect of cryogenic treatment on the microstructure and wear behavior of a T-42 tool steel
- 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
- The memory effect in polyolefinic products: A tool for confirming the steam sterilization process
- Neutron tomography in archaeology*
- Ultraschallprüfung von Betonbauteilen – laufzeitgesteuerte Gruppenstrahler mit Punktkontaktprüfköpfen
- Acoustic emission testing of surface roughness and wear caused by grinding of ceramic materials
- Electrochemical impedance spectroscopy of hardened compacted cemented soils at early curing stage
- Microstructure and pore fractal dimensions of recycled thermal insulation concrete
- Microstructure and tribological properties of electrolytic plasma nitrided high-speed steel
- Exploitation of limestone in brick making
- Effect of alkaline treatment on physico-mechanical properties of black rice husk ash filled polypropylene biocomposites
- Kalender/Calendar
- Kalender