Research On Stable Rubber-plastic Polymer Alloy Modified Asphalt

With the increasing of traffic volume and the growing of heavy vehicles, Using polym er to modify asphalt has been a valid method and a developing direction to mend the a pplication performance of asphalt. Waste rubber and waste plastic power modified asphal t has been popular used and deeply studied worldwide, because of its abundance, cheap ness, simple technical and extraordinary performance rubber modified asphalt has obviousl y improved the low temperature performance, plastic modified asphalt has obviously imp roved the high temperature performance, if we can combine the waste rubber with waste plastic a new type of modified materials, play the single modifier advantage, so not only c an effectively improve the asphalt material performance, but also bring significant social v alue and economic benefits.Based on the concept of polymer alloy, In this work study the rubber and plastic pol ymer alloy modified asphalt. To study the preparation technology of rubber modified asphal t, determining the amount of dosage of modifier and stabilizer; the performance of rubber and plastic modified asphalt was studied by traditional physical index and the performanc e index of SHRP asphalt binder, which contrast with rubber, plastic, SBS modified asph alt; Besides the modification mechanism of rubber and plastic modified asphalt has been explored by using analysis of functional group, structure state, compatibility, and to furth er investigate the influence of mechanism on the rubber and plastic modified asphalt perfo rmance.The results as follows: the traditional physical index of softening point, viscosity o f 60℃, ductility, penetration of rubber and plastic modified asphalt, the modified effect i s not good as the SBS; when the SHRP index of G*/sinδ、δ、 Sand m evaluate the p avement performance, the rubber and plastic modified asphalt of high, low temperature p erformance, fatigue performance are significantly improved, The high temperature performa nce of rubber and plastic modified asphalt even better than SBS and rubber modified asp halt. Therefore, the traditional performance evaluation index for asphalt and can not effecti vely evaluate the modified asphalt, and it is necessary that the index of SHRP further ev aluate the modified asphalt.Through the study of DSR time scanning test found:the fatigue performance of rubber and plastic modified asphalt is better than the rubber and plastic modified asphalt, the ru bber and plastic modified asphalt has good fatigue properties. The absorption peak of infra red spectrum analysis showed that the characteristics of the blending rubber modifier and r ubber modified asphalt is physical blending, which effectively ensure the advantage characte ristics of the rubber and plastic rubber plastic alloy did not change, ensure the advantage e ffect does not damage when the two substances is blending, which guarantee the high tem perature stability and the low temperature cracking resistance of asphalt.The appropriate modifier content is a necessary condition for the formation of rubber and plastic modified asphalt space compact network structure; rubber and plastic modifier and asphalt has good compatibility, swelling is full, the modifier uniformly dispersed in a sphalt by pellets or flocculent, asphalt and modifier form the network structure with mutual ly through space, which constraint rubber and plastic modified asphalt flow and deformati on, and improve the asphalt anti—deformation, low temperature cracking resistance, fatigue resistance and aging properties.Based on the indoor test, the modified asphalt is tested with different content modi fier, puts forward the rubber and plastic modified asphalt technical requirements.