Abstract
The poor salt storage and sustained release properties of active ice suppression materials for asphalt pavement has led to limitation in their application. In order to improve salt storage capacity and sustained release performance of ice suppression materials used in asphalt mixture, new salt storage carrier, magnesium oxychloride cement (MOC), was designed to prepare salt sustained release ice suppression materials in this work. Fly ash (FA) was adopted as a water resistance modifier for MOC after alkali activation, salt storage and hexadecyltrimethoxysilane (HDTMS) hydrophobic modification operations. The salt sustained release and ice suppression performance, microscopic morphology, hydrophobicity, water resistance of the ice suppression materials were evaluated by electrical conductivity, scanning electron microscope (SEM), contact angle, compressive strength and freezing point drop test. The results show that MOC is suitable for asphalt mixture pavement while ensuring the ice suppression performance, when the molar ratio of MgO, MgCl2 and H2O is 5.5: 1: 15. Alkali activation and HDTMS hydrophobic modification operations can significantly improve the salt storage and hydrophobic performance of FA. The water resistance and sustained release performance of MOC are enhanced, when FA is incorporated. The new ice suppression materials have better salt storage sustained release performance and the ice suppression effects are excellent, based on MOC as the carrier. It has certain significance in the field of active ice suppression in asphalt pavement engineering.
Published Version
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