• 제목/요약/키워드: Portland

검색결과 1,233건 처리시간 0.054초

RC 구조물의 균열보수용 조강성 폴리머 시멘트 복합체의 접착성능에 관한 연구 (A Study on the Adhesive Performance of High-early Strengthening Polymer Cement Composites for Crack Repair of RC Structures)

  • 박동엽;김상현;조영국
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2023년도 가을학술발표대회논문집
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    • pp.179-180
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    • 2023

  • The adhesion performance of PCCs for crack repair of RC structures was greater in the case of using ultra high-early strength cement than in the case of using ordinary Portland cement, and the effect of mixing silica fume was higher in the case of ordinary Portland cement than that of ultra high-early strength cement. On the other hand, 130% of W/C was more fluid than 80% of W/C in the same P/C 80%, which increased the fillability and improved the strength, but the strength improvement effect was the greatest in adhesion in flexure. Through this study, the basic characteristics of the adhesion performance of PCCs were identified, and based on this, it is necessary to induce an optimal mixing design that can increase adhesion performance through various mixing designs.

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콘크리트 벽돌 및 속 빈 콘크리트 블록 제품의 백화시험 평가 (Efflorescence Test Evaluation of Concrete Brick and Hollow Concrete Block Products)

  • 이상현;기전도;조홍범;김영선;전현수;문형재
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2023년도 가을학술발표대회논문집
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    • pp.207-208
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    • 2023

  • Concrete bricks and hollow concrete block products manufactured using ordinary portland cement react with salt and carbon dioxide absorbed from the soil and atmosphere in the use environment, causing contamination such as efflorescence. This is due to the reaction between calcium hydroxide, a cement hydration product, and carbon dioxide, producing and eluting calcium carbonate. This study was a preliminary study to compare and evaluate the reduction of efflorescence in concrete bricks and hollow concrete block products manufactured using carbon dioxide reaction hardening cement. The purpose was to evaluate the efflorescence occurrence in products using ordinary Portland cement.

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