Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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A Study on the Fundamental Mechanical Properties of Hydrophobic Cementeous Mortar using Silane Admixtures

실란계 혼화제를 활용한 소수성 시멘트 모르타르의 기초물성 연구

  • Oh, Hongseob (Department of Civil Engineering, Gyeongnam National University of Science and Technology)
  • 오홍섭 (경남과학기술대학교 토목공학과)
  • Received : 2018.03.08
  • Accepted : 2018.05.21
  • Published : 2018.06.30
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Abstract

In this study, emulsion type hydrophobic admixture was prepared by mixing polyvinyl alcohol surfactant, polymethyl hydro-siloxane and meta kaolin, and the compressive strength and mechanical properties such as permeability and contact angle test of the mortar were evaluated. The developed hydrophobic admixture showed no decrease in strength and the mortar specimen with magnesium oxide developed the early strength. In the case of permeability, total seepage was significantly decreased when the hydrophobic admixture was directly mixed with the mortar, but the effect of meta kaolin contained in hydrophobic admixture was not significant. The surface of specimens coated with hydrophobic admixture shows that the contact angle on the surface was highly increased compared with reference mortar specimen. Further researches to obtain the optimum mix proportion of the PVA fiber, nano-silica and meta kaolin for producing the super-hydrophobic surface are required.

본 연구에서는 폴리비닐 알코올 계면활성제와 폴리메틸 하이드로 실록산을 혼합하여 에멀젼 형태의 소수성 혼화제를 제조하였으며, 이를 적용한 모르타르의 강도와 역학적 성질을 평가하였다. 개발된 소수성 혼화제는 강도 감소가 나타나지 않았으며, 산화마그네슘 혼입 모르타르는 조기에 강도가 발현되는 것으로 나타났다. 수밀성의 경우에는 모르타르에 소수성 혼화제를 직접 배합한 경우에 투수계수가 크게 감소하는 것으로 분석되었으나, 메타카올린에 의한 효과는 크지 않은 것으로 관찰되었다. 표면의 소수성은 표면을 코팅한 시편에서 접촉각이 증가하여 소수성 표면을 만드는 것은 확인되었으며, 혼화제에 사용된 섬유와 메타카올린의 혼입율이 최적화되지 않아 초소수성 표면을 갖지는 못하는 것으로 분석되었다.

Keywords

References

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