Laboratory evaluation of long-term anti-icing performance and moisture susceptibility of chloride-based asphalt mixture

The objective of this research is to investigate the long-term anti-icing performance and moisture susceptibility of chloride-based asphalt mixture. Two experiments (the natural and accelerated dissolving-out methods) were conducted on the Marshall samples and their salt releasing amount were determined based on the density measurement of the aqueous solution with a hydrometer. In addition, the impact of anti-icing agents (MFL) on the mixture water stability was also investigated. Results show that a similar tendency in both methods was observed and the salt dissolution history was generally divided into three phases. Most notably, compared with the natural dissolving-out experiment the accelerated test was more effective and time-saving. Moreover, asphalt concrete with MFL performed poorer water damage resistance than the conventional asphalt concrete and the residual stability of the former declined more dramatically than the later. Finally, based on the 60 °C dissolving-out experiment, a model to predict the effective working time of the anti-icing asphalt pavement was proposed subsequently.