Effect of Crumb Rubber on Pore Structure of Cement Mortar

In this paper,mercury intrusion porosimeter(MIP)was used to test pore size distribution and porosity of the mortar incorporating crumb rubber.The effect of crumb rubber on pore structure of mortar was investigated.The air-entraining ability of crumb rubber was analyzed based on the relationship between crumb rubber content and poros-ity and air content.The test results show that mode pore diameter,mean pore diameter,median pore diameter and porosity of the mortar increase after crumb rubber is incorporated,but the distribution of pore size reveals a uniform distribution tendency.The air-entraining ability of crumb rubber is enhanced as its content increases.