Laboratory investigation of andesite and limestone asphalt mixtures containing sodium chloride-based anti-icing filler

• Asphalt mixtures containing anti-icing filler with different volume replacement were produced.
• Two aggregate sources were used to produce mixtures.
• Engineering properties, such as high- and low-temperature performance, and moisture susceptibility, were investigated.
• Anti-icing and deicer properties were evaluated by low temperature British Pendulum Number test and conductivity test.

The research evaluates the effects and effectiveness of a sodium chloride-based anti-icing filler on andesite and limestone asphalt mixtures. The asphalt mixtures containing different amount of anti-icing fillers were designated based on the equivalent volume replacement method. In this study, the rutting susceptibility and low-temperature flexural properties, moisture susceptibility, anti-icing properties and snow melting capacity of mixtures were evaluated in the laboratory. The results showed that the specimens containing anti-icing fillers decreased their dynamic stability, flexural strain, residual Marshall stability ratio, and TSR values compared to those control ones. The mixtures made from two aggregate sources exhibit similar trends in general. It was also proved that the asphalt mixtures containing anti-icing fillers had anti-icing and snow melting capacity at a certain condition. In this research, it could be found that the replacement of anti-icing filler was 70% (by total volume) of mineral filler, providing a good anti-icing and snow melting capacity while the mixtures were still performed very well.