Abstract
In this paper, magnesium oxychloride cement (MOC), which has a needle-like structure, is upgraded with super-hydrophobic surface using a facile method involving immersion in a FAS-ethanol solution. The influence of the molar ratios of the raw materials on the super-hydrophobic property was investigated. The phase compositions, microstructure, compressive strength, water resistance and wetting behaviour are studied in detail by X-Ray diffraction, scanning electron microscopy, a water contact angle measurement instrument, and mechanical testing. The water contact angle of as-prepared MOC reaches 152 ± 1° for the optimal mix design. The variation of the water contact angle of different mixes can be explained by the Cassie–Baxter model. The experiments using rolling off dust on the super hydrophobic surface present excellent self-cleaning ability. Moreover, proposed super hydrophobic surface exhibited excellent UV-durability, indicating a promising potential for the outdoor application.
Highlights
Magnesium oxychloride cement (MOC) has attracted extensive attention, as it is generally associated with ambient temperature curing and excellent materials properties such as fast setting, high mechanical strength, good resistance to abrasion and fire [1,2,3,4,5]
The present study aims to propose a novel method for the fabrication of super hydrophobic surface on MOC by applying the unique needle-like structure Phase 5 of MOC
The results show that the designed super MOC surface possesses a super hydrophobic property, together with an excellent water-repellency and self-cleaning ability
Summary
Magnesium oxychloride cement (MOC) has attracted extensive attention, as it is generally associated with ambient temperature curing and excellent materials properties such as fast setting, high mechanical strength, good resistance to abrasion and fire [1,2,3,4,5]. Li et al [2] investigated the influence of the molar ratios of raw materials on the properties of magnesium oxychloride cement They found that there are three different structures of Phase 5 specified as plate-like, needlelike and gel-like crystals. As the packing of the needle-like structures resulting in more space for the water to penetrate, MOC rich in need-like Phase 5 always results in a poor water resistance and leads to a very low strength of MOC at ambient temperature after 28 days in water [8] Another efficient method is to apply additives to improve the water resistance of MOC. The results show that the designed super MOC surface possesses a super hydrophobic property, together with an excellent water-repellency and self-cleaning ability
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