Abstract: The influences of nano-SiO2 (instead of cement) and rubber powder (instead of river sand) on the compressive strength, flexural strength and splitting tensile strength at 28 days of recycled concrete were studied by mass substitution method. The two-dimensional random aggregate release program was established by MATLAB software, and the mechanical properties of recycled concrete under uniaxial compression were numerically simulated by ABAQUS software. Results show that the compressive strength, splitting tensile strength and flexural strength of recycled concrete increased first and then decreased with the increasing amount of rubber powder. When the amount of rubber powder was constant, the compressive strength, splitting tensile strength and flexural strength of recycled concrete increased with the increasing amount of nano-SiO2. Compared with the group without nano-SiO2, the compressive strength, splitting tensile strength and flexural strength of recycled concrete incorporated 1.5% nano-SiO2 were increased by 13.3%, 22.8% and 21%, respectively. The error between the simulation results under uniaxial compression test and the real test results on the reference group (nano-SiO2 and rubber content is 0) and the test group (1.5% nano-SiO2 and 5% rubber) was minor, which indicated that the calculated values obtained from the numerical simulation analysis were in good agreement with the experimental values.
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2021, Vol. 35 
