Application of rubber asphalt performance test technology

Through investigating and studying the conventional technology index system of the rubber asphalt evaluation at home and abroad, the interior 8 different matrix asphalts were adopted to prepare rubber asphalts. Based on the domestic and foreign penetration, cone into the degree of specification, ductility, softening point, elastic recovery, rebound recovery, Brookfield revolving viscosity and dynamic shear rheological(DSR) test, the rubber asphalt performance was evaluated, focusing on analyzing the correlation between the matrix asphalt four components and the detection index. The study shows that the insufficiency of the rubber powder swelling effect can lead to a large error in the test results of the penetration degree and delay. The small cone test data is very stable and can effectively evaluate the shear rheological properties of rubber asphalt.Rebound recovery can effectively evaluate the elastic recovery ability of rubber asphalt in the lower deformation range. The elastic range of rubber asphalt is determined to be 20%-30%. Based on DSR tests such as strain scan test, temperature scanning test, frequency scanning test and hysteresis loop back test, the rubber powder and asphalt matrix compatibility can be significant enough to distinguish. The zero shear viscosity(ZSV) made by repeated creep test can reasonably evaluate the high temperature performance of rubber asphalt. Multivariate regression analysis and grey correlation were used to evaluate the correlation between the four components and the performance indexes of the matrix asphalt, with a high degree of asphalt and saturation. The correlation coefficient of 60℃ rut factor and the matrix asphalt four components is 0.900. The correlation coefficient of the 60℃ complex elasticity modulus and ZSV and matrix asphalt four components are 0.9999 and 1.0, respectively.