基于高温固化的环氧沥青开发及性能表征

Development and characterization of high temperature curing epoxy asphalt

介绍了一种自主开发的新型高温固化环氧沥青,利用旋转黏度仪、万能试验机、扫描电镜(SEM)、动态热机械分析仪(DMTA)分别测试环氧沥青的黏度、拉伸性能、微观形貌特征及动态机械性能,并测试环氧沥青混合料的马歇尔强度、高温抗车辙及低温抗开裂性能。结果表明,在施工温度下,环氧沥青黏度增长较缓慢,能够满足施工要求;环氧沥青拉伸性能良好,其拉伸强度及断裂伸长率均明显高于技术要求;环氧沥青固化后形成沥青分散在环氧树脂中的海岛结构,沥青与环氧树脂相容性良好;环氧沥青的玻璃化转变温度比纯环氧树脂的低,且随着温度的升高,其储能模量比环氧树脂的降低更快。环氧沥青混合料高温抗车辙能力及低温抗开裂能力均十分优异,其强度形成快,可缩短养护时间,实现快速通车。

The development of a new kind of high temperature curing epoxy asphalt was focused,the performance of epoxy asphalt binder were characterized by rotary viscometer,universal testing machine,scanning electron microscope（SEM）and dynamic mechanical thermal analyzer（DMTA）.Furthermore,the performance of epoxy asphalt mixture was studied by marshall stability,hamburg wheel tracking test and bending beam test.The results indicated that the viscosity of epoxy asphalt increased slowly and could meet the requirement of construction.The tensile strength and elongation at break of epoxy asphalt were obviously higher than those of technical requirements.After the curing,there was island-shaped structure with asphalt dispersing in epoxy resin,and asphalt had a better compatibility with epoxy resin.The glass transition temperature of epoxy asphalt was lower than pure epoxy resin.When the temperature increased,the storage modulus reduced both of epoxy asphalt and pure epoxy resin,and the reduction of epoxy asphalt was faster.Epoxy asphalt mixture had excellent pavement performance,including high temperature anti-rutting ability and low temperature anti-cracking ability.Also,the mixture had a shorter curing time,which cloud shorten maintenance time and quickly open traffic.