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재유화형 분말수지 출입 폴리머 시멘트 모르타르의 건조수축 및 강도특성

Drying Shrinkage and Strength Properties of Polymer-Modified Mortars Using Redispersible Polymer Powder

  • 연규석 (강원대학교 농업공학부) ;
  • 주명기 (주성대학 콘크리트 보수보강재료 연구센터) ;
  • 이현종 (강원대학교 석재복합 신소재제품 연구센터) ;
  • 김성기 (강원대학교 대학원) ;
  • 이지원 (강원대학교 대학원)
  • 발행 : 2006.01.01

초록

This study was conducted to investigate experimentally the drying shrinkage and the strength properties of redispersible SBR and PAE powder-modified mortars. Polymer-cement ratio, content of shrinkage-reducing agent and antifoamer content were manipulated as the experimental variables. The peculiarity of this study is to obtain a high early-age strength by using the portland cement and alumina cement with the ratio of 8 : 2. Until 7 days of age, the drying shrinkage remarkably increased up to $1\~2\times10^{-4}$, while it tended to decrease as the ratio of polymer to cement ratio and the content of shrinkage-reducing agent increased. Polymer-cement ratio was effective in improving the flexural, tensile and adhesive strengths: As the ratio increased, the strengths correspondingly increased. The flexural strength was in the range of $7\~11$ MPa, the tensile strength was $3.5\~5$ MPa and the adhesive strength was $1.2\~3.9$ MPa. On the other hand, the compressive strength tended to decrease as the polymer-cement ratio increased, and it was in the range of $23\~39$ MPa. All strengths, flexural, tensile, adhesive and compressive strengths, decreased as the content of powder shrinkage-reducing agent increased. It turned out that the polymer-cement ratio influenced more on the behavior of drying shrinkage and the properties of strength than the powder shrinkage-reducing agent did.

키워드

참고문헌

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