Research on Curing Behavior and Performance of Waterborne Epoxy Resin Composite Modified Emulsified Asphalt
LIU Shengjie1,*, CAO Xu1, ZHANG Yulin1, FU Yongteng1, JIAO Xiaodong2
1 College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China 2 Guangxi Transportation Science and Technology Group Co.,Ltd., Nanning 530007, China
Abstract: The insufficiencies of single modification agents in enhancing the performance of emulsified asphalt have prompted a shift towards an emphasis on composite modification. This study focused on the composite modification of emulsified asphalt using waterborne epoxy resin (WER) and styrene-butadiene rubber (SBR) latex. A comprehensive analysis was carried out to assess the influence of WER content on the composite modified emulsified asphalt, including evaluations of storage stability, curing rate, bonding properties, and asphalt-aggregate adhesion. Moreover, correlations between curing time, pull-off strength, and adhesion grade were established. Additionally, digital analysis of fluorescence images and an investigation into the microstructure and infrared characteristics of the composite modified emulsified asphalt were conducted. The findings indicated that with the increasing of WER content in the composite modified emulsified asphalt, it’s curing time should decrease, while it’s pull-off strength and asphalt-aggregate adhesion should improve. Notably, a significant non-linear correlation was observed among these there factors. However, the performance variation pattern became unstable as the WER content approached 15%. Conversely, with an increase of WER content, the storage stability and compatibility of the composite modified emulsified asphalt deteriorated, accompanied by an increase in the proportion of micro-distributed epoxy resin within the composite, albeit with impaired distribution uniformity. Ultimately, this comprehensive analysis identified an optimal WER content range of 6% to 9% for the composite modification of emulsified asphalt, considering both comprehensive performance and economic factors.
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2024, Vol. 38 
