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Title |
Microstructure Analysis of Cement Composite containing PMHS Emulsion to improve Hydrophobic
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Authors |
김영환(Younghwan Kim) ; 오홍섭(Hongseob Oh) |
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DOI |
https://doi.org/10.11112/jksmi.2021.25.1.25 |
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Keywords |
모세공극; 시멘트 페이스트; 접촉각; 과소수성표면; PMHS 유액 capillary porosity; cement paste; contact angle; hypohydrophobic surface; PMHS emulsion |
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Abstract |
For developing the durable eco-concrete, water-repellent and hydrophobic emulsion were prepared by stirring and mixing polymethyl hydrosiloxane and polyvinyl alcohol. After adding the PMHS emulsion cement paste, the hydration reaction characteristics and the change in chemical composition were analyzed through BSE and EDS analysis, and the micropores were evaluated by MIP test. Cement mixed with PMHS emulsion was analyzed to increase the hydration reactivity and to decrease the capillary porosity, but it was found that the capillary porosity varies depending on the degree of dispersion of the emulsion in the cement paste. In the case of the emulsion containing metakaolin, there was little difference in hydration degree and porosity from the case of using only the PMHS emulsion. However, when the cement surface was coated with PMHS emulsion, the contact angle was found to increase significantly compared to OPC, and it was analyzed that especially when PVA fiber was used together, it changed to a hypohydrophobic surface.
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