Study on the performance of cold recycled emulsified asphalt mixture under multi-factor coupling action

The emulsified asphalt cold recycling technology is recognised for contributing to energy conservation and emission reduction. However, the mechanical properties and road performance of emulsified asphalt mixtures can be compromised by several factors. This research investigates the effects of using waste aggregate (RAP), adding cement, varying curing times, and altering emulsified asphalt content on recycled mixtures' strength, temperature stability, and water resistance. The study utilised waterborne epoxy emulsified asphalt, recycled waste aggregate, limestone aggregate, and Xinhua PO42.5 cement. A comprehensive series of tests were performed, including split tests, rutted plate tests, low-temperature beam tests, Marshall stability tests, and freeze-thaw split tests. The findings indicate that increasing the proportion of recycled waste aggregate reduces mechanical properties and high-temperature performance while enhancing low-temperature flexibility. The addition of cement strengthens mechanical properties and high-temperature performance but negatively impacts low-temperature flexibility. This research identifies the optimal mix proportions for peak performance, emphasising the significance of achieving a balance in ingredient ratios for cold-recycled waterborne epoxy-emulsified asphalt mixtures.