Abstract
Neat asphalt emulsions have poor physicochemical properties. In order to endow neat asphalt emulsions with excellent physicochemical properties and broaden their application as pavement, this study adopted the composite modification method using waterborne epoxy resin (WER) and styrene–butadiene rubber (SBR) latex. Firstly, a waterborne-epoxy–SBR composite modified asphalt emulsions (WESAEs) with different amounts of WER were prepared, and the storage stability, workability, and residual properties were characterized with a series of tests. Then, the performance of the WESAEs was comprehensively evaluated by multiobjective gray target decision-making method, through which the optimal amount of WER in WESAE was determined. Lastly, the modification mechanism of WER was revealed by Fourier-transform infrared spectroscopy test. The results show that the incorporation of WER improves the high-temperature performance, thermal stability, rheological property, and adhesion of the SBR modified asphalt emulsion (SBRAE) residues. However, an excessive amount of WER will adversely affect the storage stability, particle distribution uniformity, and workability of the WESAE binder. The WESAE with 3% WER showed the best comprehensive performance; thus, the optimal amount of WER is 3% of the weight of the WESAE. Additionally, modification of the SBRAE by WER is a physical blending process, meaning no chemical reaction occurs in the blending process.
Highlights
Asphalt emulsions have been widely used in road construction. They are used as binders for microsurfacing and for slurry seals, and for fog seal, prime coat, and tack coat purposes [1,2]
Regarding the cold-mixed asphalt emulsion binder, its good storage stability and workability are the reasons for its application and popularization in practical engineering
This paper investigated the storage stability, workability, and evaporation residue properties of the waterborne-epoxy–SBR composite modified asphalt emulsions (WESAEs); evaluated the comprehensive performance of the WESAE; and revealed the modification mechanism of the waterborne epoxy resin (WER) modifier
Summary
Asphalt emulsions have been widely used in road construction. They are used as binders for microsurfacing and for slurry seals, and for fog seal, prime coat, and tack coat purposes [1,2]. In actual engineering, neat asphalt emulsions show relatively poor performance in terms of high-temperature conditions, thermal stability, mechanical properties, and adhesion with aggregates [3,4]. They cannot meet the high performance demands and are mainly confined to lower seal coat and non-structural pavement layer applications
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