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Title |
Water Repellent Characteristics According to the Surface Properties of Cement Mortar Mixed with Water-soluble Water Wepellent
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Authors |
강석표(Suk-Pyo Kang) ; 강혜주(Hye-Ju Kang) ; 홍성욱(Seong-Uk Hong) ; 양승현(Seung-Hyeon Yang) |
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DOI |
https://doi.org/10.11112/jksmi.2020.24.6.42 |
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Keywords |
실란; 실록산; 발수제; 소수성; 초소수성; 접촉각 Silane; Siloxane; Water repellents; Hydrophilic; Hydrophobic; Contact angle |
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Abstract |
This paper is a basic study to improve durability by imparting hydrophobicity to the surface and sphere of cement-based materials. A cement mortar to which a silane/siloxane-based mixed water repellent was added was prepared, and its initial hydration performance, flow performance, and compressive strength were measured. In addition, after the surface was abraded, the water contact angle and water absorption were measured. The flow of cement mortar to which the water repellent was added was found to decrease up to 1.5% in the addition amount of the water repellent agent, and increased at 3.0% in the addition amount. It was found that the setting time of the cement paste was delayed in both the initial setting and the termination when the water repellent was added. It was found that the compressive strength decreased from 3.0% of the maximum added amount of the water repellent to a maximum of 30%. The contact angle was found to increase when the water repellent was added to the cement mortar, and the contact angle after surface polishing was found to be larger than before surface polishing. The addition of the water repellent showed hydrophobicity not only on the surface but also on the surface and cross section damaged by polishing. The water absorption rate was found to decrease when the water repellent was added to the cement mortar, and the water absorption rate after surface polishing was found to be greater than before surface polishing.
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