废旧轮胎橡胶粉改性沥青结合料相容性评价研究

摘要

采用溶解度参数计算、离析软化点差值测试和原子力显微镜微观扫描等方法,对比研究了SBS和废旧橡胶轮胎粉与70#A级基质沥青间的相容性.结果表明,单一评价体系不能准确评定橡胶粉与基质沥青间的相容性,须结合QQ种分析方法综合评定.橡胶粉颗粒与基质沥青存在相对分子质量、溶解度参数、化学结构和热稳定性等方面的差异,属于热力学相容性较差体系:但两者间存在工艺相容性,即可通过机械搅拌的方法实现物理混容.%The solubility parameter calculation,difference of segregation softening point test and atomic force microscope scanning have been used to comparative research the comparability between 2 modifiers (SBS and waste rubber powder) and 70#A base asphalt.The results show that the compatibility between rubber powder and matrix asphalt can not be evaluated accurately by single evaluation system,comprehensive evaluation of various analytical methods should be implemented.There are many differences of relative molecular weight,solubility parameter,chemical structure and thermal stability between rubber powder particles and matrix asphalt,so they belong to the poor thermodynamic compatibility system.But there are technological compatibility between the two,that is,the physical mixing capacity can be realized by mechanical stirring method.