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Research on Mechanical Properties of Concrete with Nano-Silica,Rubber and Recycled Concrete

ZHAO Qiang;LIU Yuanzhen;Shanxi Construction science Academy;College of Architecture and Civil Engineering,Taiyuan University of Technology;  
Through the experimental study,effects of different replacement ratios of recycled aggregate(0%,30%,50%),rubber(0%,5%,10%,15%)and nano SiO_2(0%,1.5%,3%,5%)on the mechanical properties of rubber-recycled concrete were conducted.The test results show that,the increase of replacement ratio of recycled aggregate and rubber reduces the bond behavior between cement paste and aggregates,thus showing adverse effects on the compressive and tensile strengths of rubber-recycled concrete.The incorporation of nano SiO_2 amazingly improved the microstructure of rubber-recycled concrete,and the mechanical properties of rubber-recycled concrete are significantly improved.The results confirmed that adding nano SiO_2 is feasible and effective way to improve the mechanical properties of rubber recycled concrete.
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