Experimental study of working performance and mechanical properties to rubber with limestone powder concrete

Abstract

The influence of limestone powder concrete on working performance and mechanical properties are researched under which it is changed substitution rate of rubber powder and mixing ratio of rubber powder with different fineness under equal substitution rate. Take C30 concrete as an example, two proportioning schemes are set respectively: The machine-made sand of limestone powder concrete is replaced by 20 mesh rubber powder equal volume; Under the specific constant volume rate of substitution, changing the mixing ratio of 20 and 40 mesh rubber powder to research working performance and mechanical properties of concrete. The results show that the substitution rate of 20 mesh rubber powder is less than 10%, increasing the slump of concrete. On the contrary, the slump of concrete decreases sharply and the flow performance weakens. The compressive strength of concrete decreases sharply when increasing substitution rate of 20 mesh rubber powder. When Increaseing the mix ratio of 20 and 40 mesh rubber powder under equal substitution rate, the slump of concrete increases and the compressive strength increases first and then decreases. Fixing the mixing ratio, the slump and compressive strength decrease with the increase of rubber powder substitution rate. When the mixing ratio of 20 and 40 mesh rubber powder is 2:1, the compressive strength of concrete is higher.