Influence of water-borne epoxy resin content on performance of waterborne epoxy resin compound SBR modified emulsified asphalt for tack coat

In order to improve the performance of emulsified asphalt for tack coat, waterborne epoxy resin was blended with styrene-butadiene rubber (SBR) to prepare epoxy SBR modified emulsified asphalt by using an emulsification and then a modification process. The contents of SBR latex and epoxy resin in modified emulsified asphalt were determined by several evaluation indexes. The SBR latex content was determined by the adhesion and non-isothermal differential scanning calorimetry (DSC) experiment. The general content range of the waterborne epoxy resin was determined through storage stability test at first. Brookfield Rotational Viscometer was employed to test the viscosity of modified emulsified asphalt with the passing of time. Then the epoxy resin curing reaction time was determined and used to guide the modified emulsified asphalt evaporation residue experiments. The modified emulsified asphalt was employed as bonding material in a rolled composite plate and an 45 oblique shearing tests were taken on the core samples. The performance evaluation results have been compared with specification standards. It was found that the addition of SBR latex and epoxy improve the high and low temperature properties and shear strength of asphalt significantly. Particularly, under the optimum SBR and epoxy resin content, the modified emulsified asphalt shows better physical thermal property and therefore better storage stability. The optimal contents of SBR and waterborne epoxy resin are all determined as 3%. (C) 2017 Elsevier Ltd. All rights reserved.