热拌环氧沥青流变性能研究

Rheological properties of hot mix epoxy asphalt

为探究热拌环氧沥青流变性能,分别采用动态剪切流变仪(DSR)及弯曲梁流变仪(BBR)对环氧沥青高温性能及低温性能展开研究,分析其随环氧体系掺量及基质沥青种类变化的规律,通过相容性试验及荧光显微镜试验揭示了其流变性能变化的原因。结果表明:环氧体系掺量越大,基质沥青与环氧树脂的相容性越好,环氧沥青高温性能越强,低温抗裂性降低。低温性能敏感性随环氧体系掺量的增大而减小,基质沥青对其无显著影响。质量分数30%~40%为环氧沥青相转变的环氧体系界限掺量,当环氧体系质量分数不高于30%时,环氧沥青中基质沥青为主相,环氧树脂固化产物为副相,当环氧体系质量分数不低于40%时,环氧沥青以基质沥青为副相,环氧树脂固化产物为主相。

In order to explore the rheological properties of hot mix epoxy asphalt,the dynamic shear rheometer(DSR)and bending beam rheometer(BBR)were used to compare the high-temperature and low-temperature properties of epoxy asphalt,and the changes of rheological properties with the content of epoxy system and the type of matrix asphalt were analyzed.The reasons for the change were further explored by compatibility test and fluorescence microscope.The results showed that the higher the content of epoxy system,the better the compatibility between matrix asphalt and epoxy resin,the stronger the high-temperature performance of epoxy asphalt and the lower the low-temperature crack resistance.The low temperature performance sensitivity decreased with the increase of the content of e-poxy system,and the matrix asphalt had no significant effect on it.The mass fraction of 30%-40% was the limit content of epoxy system for phase transition of epoxy asphalt.When the mass fraction of the epoxy system was not higher than 30%,the matrix asphalt was the main phase in epoxy asphalt,and the cured product of epoxy resin was the secondary phase.When the mass fraction of the epoxy system was not less than 40%,the epoxy asphalt was the secondary phase and epoxy resin curing products as the main phase.