基于再生聚合物材料的复合改性沥青高低温性能试验研究

Experimental Study on High and Low Temperature Performance of Recycled Polymer Material Composite Modified Asphalt

摘要: 随着城镇化、工业化进程的推进，不可降解的废旧轮胎以及塑料薄膜数量逐年增加，这些废旧材料的随意丢弃不仅污染环境，而且对人类的健康造成威胁。本研究以废旧橡胶粉和再生PE作为添加剂，对基质沥青进行复合改性处理，并通过软化点、针入度、延度及劲度模量等指标评价其高低温性能。运用极差法对两种添加剂的改性作用进行了敏感性分析，结果表明：再生PE主要提升复合改性沥青高温稳定性，但是降低了沥青的低温抗裂性；废旧胶粉显著提高了沥青的低温抗裂性，但是对高温稳定性提升不明显。最终，通过复合改性处理，不仅能提高沥青的高温稳定性，而且可以明显提高沥青的低温抗裂性能。

Abstract: With the development of urbanization and industrialization, the number of non-degradable waste tires and plastic film increases year by year. The random disposal of these waste materials not only pollutes the environment, but also threatens human health. In this study, waste rubber powder and recycled PE were used as additives, and modified with asphalt, and its high and low temperature properties were evaluated by softening point, penetration, ductility and modulus of stiffness. Sensitivity analysis of the two additives was carried out by using the range difference method. The results showed that the recycled PE mainly enhanced the high temperature stability of the modified asphalt, but reduced the low temperature crack resistance of the asphalt. The low temperature cracking resistance of asphalt was improved obviously by waste rubber powder, but the stability of asphalt at high temperature was not improved obviously. The results show that the high temperature stability and the low temperature crack resistance of asphalt can be improved by the compound modification.