降黏型与表面活性型温拌剂对温拌沥青性能影响试验研究

Experimental Study on Effect of Viscosity Reducing and Surface Active Warm Mixing Agent on Performance of Warm Mix Asphalt

为达到降低沥青路面施工温度、降低能耗的目的,采用两种不同类型(降黏型与表面活性型)的温拌剂分别掺入沥青中制备温拌沥青结合料,对其性能进行测试。结果表明:降黏型温拌剂SAS与表面活性型温拌剂Retherm都能够提高基质沥青的软化点;SAS能够大幅提高沥青针入度,而Retherm对沥青针入度增幅较小;SAS与Retherm都会显著降低沥青的延度;SAS温拌沥青的当量软化点较环球法试验结果的软化点低,Retherm温拌沥青的当量软化点与环球法试验相当;SAS会明显降低基沥青的表观黏度,而Retherm对沥青表观黏度作用不明显;SAS能降低沥青的玻璃化转变温度(Tg),而Retherm会提高沥青的玻璃化转变温度(Tg)。

In order to reduce the construction temperature of asphalt pavement and reduce energy consumption,two different types of warm mixing agent(viscosity reducing and surface active)were used to prepare warm mix asphalt binder in asphalt,and their properties were tested.The results show that both viscosity reducing warm mixing agent SAS and surface active warm mixing agent Retherm can improve the softening point of base asphalt,SAS can increase the needle penetration of the asphalt greatly,but Retherm can less increase the needle penetration of asphalt.SAS and Retherm can reduce the ductility of the asphalt significantly.The equivalent softening point of SAS warm mix asphalt was lower than that of global method,and the equivalent softening point of Retherm warm mix asphalt was similar to that of global method.SAS will obviously reduce the apparent viscosity of base asphalt,but Retherm has no obvious effect on the apparent viscosity of asphalt;SAS can reduce the glass transition temperature(Tg)of asphalt,but Retherm will increase the glass transition temperature(Tg)of asphalt.