Abstract
Waterborne epoxy emulsified asphalts (WEEA) have high densities, good chemical stabilities, and high viscosities. However, they have problems in terms of overly high stiffness and low-temperature brittleness when applied as thin-coat asphalt mixtures. In this study, testing was conducted to obtain the optimal mixing ratio for WEEA. Anti-sliding, rutting, water stability, Cantabro, and low-temperature bending tests were carried out to evaluate the performance of thin coating layers formed from open graded friction course (OGFC)-5 WEEA mixtures, with the results indicating that the optimal ratio of waterborne epoxy resin emulsion and curing agent was 2:1 and that the dosage of waterborne epoxy resin should be maintained between 15 and 30%. The surface texture depth and British Pendulum Number (BPN) of the OGFC-5 WEEA mixtures were larger than 0.91 mm and 77.4, respectively, and the WEEA mixtures had better water stabilities and spalling resistance performance than a mixture without WEEA. Waterborne epoxy resin dosages of 15 and 30% resulted in WEEA mixture stabilities of up to 4,285 and 8,798 times/mm, respectively, and tensile strengths at -10 ℃ of 2.204 and 4.727 MPa, respectively. The relatively good pavement functional and low-temperature performance of the optimized OGFC-5 WEEA mixture suggest its usefulness as a pavement maintenance material.
Highlights
Maintenance of the enormous and growing highway network system in China is becoming increasingly challenging
Increasing the waterborne epoxy dosage improves the adhesion between aggregates and hardens the Waterborne epoxy emulsified asphalts (WEEA), leading to a mixture with a high level of hardness
The dynamic stability of the WEEA mixture is much higher than the specification requirements, indicating that the mixture has excellent hightemperature stability
Summary
Maintenance of the enormous and growing highway network system in China is becoming increasingly challenging. It has been found that the application of emulsified asphalt is an effective method of pavement maintenance that is compatible with current developmental trends in asphalt pavement technology (Anthonissen et al, 2016; Law et al, 2017; Santos et al, 2018). Compared with hot mix asphalt, an emulsified asphalt mixture has many advantages for use as a construction material, including improving the construction environment, reducing the effects of environmental factors, saving energy, etc., and has come to be widely used in preventive and daily pavement maintenance. The use of emulsified asphalt as a cementing material has a number of disadvantages, including low strength in the early stages of setting, insufficient cohesion, and poor water and temperature stability (Wang, 2015), all of which have restricted the popularization and application of emulsified asphalt
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