Abstract
Traditional pitch has thermal plasticity in high temperature and rutting can be caused under external load. Aiming at the problem, a mixed pitchy material with high performance of durability is designed in this paper. A comparison test is operated on the stickiness, infrared spectrum, deformation and resistance to corrosion of the material and traditional pitchy material. In research conclusion: in different environment of high temperature, the viscosity of HDP mixed pitch increases rapidly within 20min; it does not change 20min later. The higher environmental temperature is, the lower the viscosity of mixture will be. Before the solidification of HDP mixture, the molecules have the structure of aromatic nucleus and the curve of infrared spectrum is very complex. After the solidification of HDP mixture, some original parts disappear and the curve of infrared spectrum is flat. The product is in three-dimensional network structure that makes HDP have strong strength and the feature of high temperature resistance. Under the load of vehicles, the track of HDP mixed pitch only increases slightly. It has good performance of deformation resistance. At the same time, HDP mixed pitch can prominently enhance the water stability of material. Traditional pitch can be seriously corroded by diesel oil. After being immersed for 120h, 12.1% weight decreases. Marshall residual stability lowers to be below 50%. However, the weight of HDP mixed pitch almost does not change in the 3 periods; Marshall residual stability always maintains to be above 94%. It indicates HDP mixed pitch has good performance of corrosion resistance. The stickiness of tested samples does not lower.
