增塑剂改性沥青路用性能试验研究

Research on Pavement Performance of Asphalt Binder Modified with Plasticizer

为了提高沥青结合料的柔韧性,借鉴增塑剂在塑料制品的成功应用,选用两种不同类型的增塑剂,研究其对沥青的改性效果.通过针入度、软化点、延度、黏度、测力延度和弹性恢复等试验对两种增塑剂改性沥青性能进行研究,并从沥青的感温性、高低温性能、弹性恢复和老化特性等方面对路用性能改善效果做出评价.试验结果表明,两种增塑剂对沥青低温柔韧性改善效果显著,同时对沥青结合料的感温性、弹性恢复和抗老化性也有一定的改善效果,但不利于沥青的高温稳定性;对比两种增塑剂改性沥青的路用性能,马来酸二辛酯的改性效果优于邻苯二甲酸二辛酯,且建议马来酸二辛酯最佳掺量值为3.0%.

With the fact that plasticizers were used successfully in plastic products to improve the low-tempera- ture flexibility of asphalt binder, two kinds of plasticizer are selected in this paper to study the impact of two plasticizers on asphalt. In this paper, 4 different dosages of the two plasticizer totally 8 dosages were put into asphalt to study the performance of asphalt binders by several routine tests including the penetration, softening point, ductility, viscosity, measuring-stress ductility and elasticity resuming. And the modification effect was evaluated in the aspect of temperature sensitivity, high temperature and low temperature, elastic recovery and aging. The test results showed that the plasticizers did help significantly in the low-temperature performance of the modified asphalt binders, also in the facts of temperature sensitivity, anti-aging ability and elasticity resu- ming, but not in high-temperature performance. In general, the plasticizer DOM was better than DOP in im- proving the properties of asphalt binders.