Performance optimization of epoxy resin-based modified liquid asphalt mixtures

This study proposes a performance optimization scheme of liquid asphalt mixtures (LAMs) based on epoxy resin-based material modification and investigates its various performances. First, thermogravimetric analysis and headspace gas chromatography–mass spectrometry were used to analyze the differences between liquid asphalt before and after curing to clarify the formation mechanism of its adhesive force. Second, a molecular model was established. The best epoxy resin and curing agent types were evaluated using an improved Flory–Huggins model and the quantum computing method. Finally, two performance optimization schemes were established to reinforce the performance defects of the mixture caused by residual diluents. Results show that liquid asphalt solidification is a physical process of volatilization of diluents. Bisphenol A epoxy resin and a polyether amine curing agent are compatible with liquid asphalt and prone to curing reactions; thus, they are most suitable as epoxy resin-based modifiers. A solution obtained by adding 2% waterborne epoxy resin and 30% mineral powder replaced with cement can significantly improve the initial strength, strength generation rate, and low-temperature crack resistance of the LAM while optimizing high-temperature performance. This LAM modification can ensure that roads repaired using the modified LAM in a low-temperature environment can be quickly opened to use and improve the durability of the road surface.