Journal of the Korea Institute of Building Construction (한국건축시공학회지)

The Korean Institute of Building Construction (한국건축시공학회)
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A Study on the Adhesion Properties of Polymer-Cement Composites for Repairing Cracks in RC Structures

RC 구조물의 균열 보수용 폴리머 시멘트 복합체의 접착특성에 관한 연구

  • Jo, Young-Kug (Department of Architectural Engineering, Chungwoon University) ;
  • Hong, Dae-Won (Department of Architectural Engineering, Chungwoon University) ;
  • Kwon, Woo-Chan (Department of Architectural Engineering, Chungwoon University) ;
  • Kim, Wan-Ki (Department of Architectural Engineering, Hyupsung University)
  • Received : 2021.12.11
  • Accepted : 2022.02.09
  • Published : 2022.02.20
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Abstract

The purpose of this study is to evaluate the adhesion properties of polymer cement composites for crack repair of an RC structure. Polymer cement composites are manufactured from cement, three types of polymers and silica fume, and the mixture is designed by adjusting the water cement ratio and AE reducing agent so that the viscosity target of the polymer cement composites is 700mPa·s or less. According to the test results, the Type-A adhesion in tension of the polymer cement composite exceeded the adhesion standard of 1.0MPa of the polymer finishing material, and furthermore, depending on the type of polymer, the adhesion in tension was highest for SAE, followed in descending order by EVA, and SBR. In addition, the adhesion in tension of Type-B is up to 1/4.5 lower than that of Type-A, but the incorporation of silica fume shows a significant improvement in terms of adhesion in tension. Based on this study, the basic mixing design of the polymer cement composites required for viscosity and adhesive performance required for crack repair of the RC structure was completed. It could be proposed as an optimal mixing design under conditions for intermixing polymer type EVA, SAE, and P/C 80%-100%.

본 연구의 목적은 RC 구조물의 균열 보수용 폴리머 시멘트 복합체의 접착성능을 평가하기 위함이다. 폴리머 시멘트 복합체는 시멘트, 폴리머와 실리카흄으로 제조하였으며, 점도가 700mPa·s 이하가 되도록 물시멘트비와 AE 감수제의 혼입량을 조정하였다. 연구결과, Type-A 인장접착강도는 폴리머계 마감 재료의 접착기준인 1.0MPa을 상회하였으며, 폴리머 종류에 따라 SAE, EVA, SBR 순으로 높은 인장접착강도를 나타냈다. 또한 Type-B의 인장접착강도는 Type-A에 비해 최대 1/4.5의 낮은 강도를 나타냈으나 실리카흄의 혼입에 따른 상당한 강도개선 효과를 보였다. RC 구조물의 균열 보수에 필요한 점도와 접착성능을 위해 EVA와 SAE의 폴리머 시멘트비 80%~100% 범위에서 일정량의 실리카 흄을 혼입하는 조건을 최적배합설계로 제안할 수 있었다.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea(NRF) grant funded by the Korea government (MSIT)(No.2021R1F1A1046181) and academic research fund of Chungwoon University in 2021.

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