Test of Mechanical Properties of Composite Recycled Concrete After Medium and High Temperature

Shilong Yan

doi:10.54691/r1qfbj60

Authors

Shilong Yan

DOI:

https://doi.org/10.54691/r1qfbj60

Keywords:

Composite material, medium and high temperature, recycled concrete, single factor analysis, double factor analysis.

Abstract

Compressive strength is one of the important indexes to test the mechanical properties of concrete. The compressive strength of recycled composite concrete after high temperature is studied by single factor experimental analysis and double factor experimental analysis. Combined with variance analysis, the influence of replacement rate of recycled aggregate, volume incorporation amount of polypropylene fiber and volume incorporation amount of nani CaCO3 on compressive strength of recycled concrete after high temperature was systematically studied. The results show that when the replacement rate of recycled aggregate is 50%, the volume incorporation amount of polypropylene fiber is 0.08%, and nani CaCO3 is 1.2%, the compressive strength of composite recycled concrete reaches the maximum value. Nano CaCO3 is the most significant factor affecting the compressive strength of recycled concrete after high temperature. The significant influencing factors are the incorporation amount of polypropylene fiber and the replacement rate of recycled aggregate.

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