Effect of gradation and fineness on performance of rubber asphalt mixture at low temperature

摘要

Bending test of rubber asphalt mixture was studied, This paper selected 5 groups with different aggregate gradation, to figure out rubber asphalt mix properties at low temperature. A comprehensive indicator was considered by comparing the test results, included flexural tensile strength, failure strain, bending stiffness modulus index. In reference to the results of test, the rubber asphalt mixture with the median grade was recommended. On the basis, more experimental research was conducted further. In view of the available situation, the small beam bend test at low temperature was carried out, consisted of 20 mesh and 40 mesh rubber powder respectively. Our findings demonstrate that at the same level of asphalt-aggregate ratio and gradation, the 40 mesh rubber asphalt mixture has better performance at low temperature.