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| Preparation and mixture performance of waterborne epoxy-SBR low temperature cold patch asphalt |
（1. Key Laboratory of Special Area Highway Engineering of Ministry of Education, Chang′an University, Xi′an, Shaanxi 710064, China；2. Shaanxi Expressway Mechanical Engineering Co., Ltd., Xi′an, Shaanxi 710038, China)
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Abstract A new type of low temperature cold patch asphalt liquid was developed by using waterborne epoxy resin and SBR latex to modify the solvent cold patch asphalt liquid. The dispersibility of waterborne epoxy resin and SBR latex in diluted asphalt was studied. Based on the orthogonal test, the composition of low temperature cold patch asphalt was recommended with viscosity at 60 ℃, mass loss rate at 3 d, viscosity difference before and after cold patch asphalt replenishment storage, softening point and flexibility of distillation residue as indicators. The performance of the waterborne epoxy resinSBR cold patch asphalt mixture was evaluated. The results show that waterborne epoxy resin and SBR latex have good microdisperse performance in diluted asphalt.The composition and dosage of waterborne epoxy resinSBR cold patch asphalt are determined with matrix asphalt SK90# and with the amounts of diluent,tackifier,antispalling agent，waterborne epoxy component and SBR latex agent of respective 26.0%, 5.0%, 0.5%, 4.0% and 2.0%. The forming Marshall stability, dynamic stability and bending tensile strength of selfdeveloped cold patch asphalt mixture are respective 74%, 91% and 26% higher than those of ordinary cold patch asphalt mixture, and the residual stability is 89%.
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Received: 24 December 2019
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