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Effect of nano-SiO2 modified recycled coarse aggregate on the mechanical properties of recycled concrete
Highlights Nano-SiO2 is adapted for enhancing the properties of recycled coarse aggregate. Concentration and soaking time of nano-SiO2 affect the strength of recycled concrete. Stress–strain curve of shows that modified recycled concrete has less brittleness. The microstructure of recycled coarse aggregate has been improved when Nano-SiO2 was adopted.
Abstract Improving the performance of the interface between old mortar and recycled coarse aggregate (RCA) is a hot topic and important to enhance the properties of recycled aggregate concrete (RAC). In this paper, the RCA was soaked by nano-SiO2 (NS-RCA) then the water absorption and crushing index of NS-RCA were investigated. The mechanical properties, such as compressive strength, flexural strength, and elastic modulus of RAC prepared by NS-RCA (NS-RAC) were studied. The Thermogravimetric and Differential Thermal Analysis (TG-DTA) and scanning electron microscopy (SEM) were applied to analyze the properties of the interface transition zone (ITZ) around unmodified RAC and NS-RAC. A modified stress–strain model of NS-RAC was proposed considering the concentration of nano-SiO2 and soaking time. The testing results showed that the concentration of nano-SiO2 and soaking time had significant effects on the strength and durability of RCA and the mechanical properties of RAC. The 2% concentration of nano-SiO2 and 48 h soaking time had the best modification effect on RCA. The compressive strength, flexural strength, and elastic modulus of NS-RAC with best modification were 31.8%, 33.2%, and 89.6% higher than those of unmodified RAC respectively. The TG-DTA and SEM analyses indicated that NS-RAC had the denser microstructure of ITZ. This study is conducive to enrich the knowledge about using NS-RAC and supplying guidance for its mix design.
Effect of nano-SiO2 modified recycled coarse aggregate on the mechanical properties of recycled concrete
Highlights Nano-SiO2 is adapted for enhancing the properties of recycled coarse aggregate. Concentration and soaking time of nano-SiO2 affect the strength of recycled concrete. Stress–strain curve of shows that modified recycled concrete has less brittleness. The microstructure of recycled coarse aggregate has been improved when Nano-SiO2 was adopted.
Abstract Improving the performance of the interface between old mortar and recycled coarse aggregate (RCA) is a hot topic and important to enhance the properties of recycled aggregate concrete (RAC). In this paper, the RCA was soaked by nano-SiO2 (NS-RCA) then the water absorption and crushing index of NS-RCA were investigated. The mechanical properties, such as compressive strength, flexural strength, and elastic modulus of RAC prepared by NS-RCA (NS-RAC) were studied. The Thermogravimetric and Differential Thermal Analysis (TG-DTA) and scanning electron microscopy (SEM) were applied to analyze the properties of the interface transition zone (ITZ) around unmodified RAC and NS-RAC. A modified stress–strain model of NS-RAC was proposed considering the concentration of nano-SiO2 and soaking time. The testing results showed that the concentration of nano-SiO2 and soaking time had significant effects on the strength and durability of RCA and the mechanical properties of RAC. The 2% concentration of nano-SiO2 and 48 h soaking time had the best modification effect on RCA. The compressive strength, flexural strength, and elastic modulus of NS-RAC with best modification were 31.8%, 33.2%, and 89.6% higher than those of unmodified RAC respectively. The TG-DTA and SEM analyses indicated that NS-RAC had the denser microstructure of ITZ. This study is conducive to enrich the knowledge about using NS-RAC and supplying guidance for its mix design.
Effect of nano-SiO2 modified recycled coarse aggregate on the mechanical properties of recycled concrete
Zhao, Wei (author) / Liu, Jinliang (author) / Guo, Huanyu (author) / Li, Linfei (author)
2023-06-25
Article (Journal)
Electronic Resource
English
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