Influence of Snow Melting Salt on High-temperature Performance of Salt Storage Asphalt Mortar
To explore the effect of snow melting salt on the high-temperature performance of salt storage asphalt mortar,the high-temperature performance of SBS group asphalt mortar and HEA group asphalt mortar was characterized by penetration,softening point,viscosity,temperature sweep,and MSCR test.The results showed that,compared with the SBS group,the HEA group had lower penetration and higher softening point and viscosity.The higher the content of snow melting salt,the higher the penetration,the lower the softening point and the viscosity of the asphalt mortar.The structural asphalt content in the asphalt mortar may be an important factor leading to this result.The complex modulus and rutting factor of asphalt mortar decrease with the increase of snow melting salt content,but the effect of snow melting salt on the phase angle of asphalt mortar is more complicated.The creep capacity of asphalt mortar increases with the content of snow melting salt,but the high elastic polymer can significantly reduce the creep performance.The creep resistance of HEA 100 is even higher than that of SBS00,so the high elastic polymer can compensate for the negative effect of snow melting salt on the high-temperature performance of asphalt mortar.In conclusion,although snow melting salt increases the potential of asphalt pavement to melt ice and snow,it also reduces the high-temperature rutting resistance of asphalt mortar.Salt storage pavement materials can be used in combination with highly elastic polymers to reduce the negative impact of snow melting salts on the high-temperature performance of asphalt mortars.
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