Study On The Properties Of Cold Mix Asphalt Based On Thermoplastic Modified Materials

Cold mix asphalt mixture is also called cold mix materials,is an environmentally friendly pavement material which has been widely popularized in road construction in recent years.Compared with common hot mix asphalt mixture,the cold mix is not necessary to control the temperature during mixing and site construction.It has the advantages of energy conservation,emission reduction and convenient construction.Therefore,it is of great significance to actively carry out the research on the performance of cold mix asphalt as an environment friendly pavement materials whether from the point of view of technical means or economic and social benefits.The study on the cold mix asphalt with thermoplastic material as modifier is carried out based on literature review and market research in this paper.The main work and conclusions are as follows:(1)The material composition and structure type of solvent cold mix materials types were analyzed,and the strength forming mechanism and influencing factors were analyzed by Moore-Coulomb theory.(2)Using a thermoplastic material as modifier to develop cold mix asphalt,the optimum shear temperature and shear time are recommended through the study of its preparation technology.(3)The optimum dosage range of modifier is recommended,and the formula of cold mix asphalt is determined through the experimental study on the performance index of cold mix asphalt.(4)The mixture ratio design of cold mix asphalt and hot mix SBS modified asphalt is carried out,and the optimum oil stone ratio range of the cold mix material is recommended on the basis of ensuring the quality of aggregate.(5)Cold mixes using the same mineral grade are compared with hot mixes for road performance,indicating that the cold mix asphalt has excellent performance applied in Hebei.