Abstract

The objective of this research is to study the properties of waterborne epoxy–modified emulsified asphalt binder (WEMEAB). The WEMEAB was prepared with a method of preemulsification and modification. The optimum asphalt-water ratio (ratio of base asphalt binder to emulsifier), emulsifier content, and waterborne epoxy content were determined through an orthogonal test with three factors and three levels. Based on the penetration system, the high- and low-temperature properties and storage stability of WEMEAB were evaluated. The distribution of waterborne epoxy in the modified emulsified asphalt binder and the microstructure of WEMEAB were observed through the Fluorescence Optical Microscopy (FOM) and Atomic Force Microscopy (AFM) tests. The test results indicated that the high- and low-temperature properties of WEMEAB were noticeably improved and that the waterborne epoxy was distributed uniformly in the modified emulsified asphalt binder with an asphalt-water ratio of 65:35, 4 % waterborne epoxy and 1.4 % emulsifier. The FOM and AFM images showed that cross-linking and interpenetration network structure and “bee-like” structures had formed on the surface of the WEMEAB.

Issue Section:
Technical Papers
Keywords:
waterborne epoxy, emulsified asphalt binder, waterborne epoxy–modified emulsified asphalt binder, orthogonal test, fluorescence optical microscopy, atomic force microscopy

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