KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
권호 표지

Resistance on the Sulfuric Acid Corrosion of Cement Matrix Containing Mineral Admixtures

광물질혼화재 혼합 시멘트 경화체의 황산 침식에 대한 저항성

Moon, Han-Young;Jeon, Joong-Kyu;Kim, Hong-Sam
문한영;전중규;김홍삼

  • Published : 2005.01.31

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Abstract

As form a part of way to improve the durability of concrete placed on deleterious environments such as acidic rivers, sewage wastewater, and sewer system, the paper presented here is the results of experimental immersion test, and for the test solution, 2% sulfuric acid solution was prepared. Also for the test specimens, 10% of silica fume, 60% of blast furnace slag and 20% of fly ash were used as partial replaced cemenetious materials for OPC and they were symbolized as OPC, SF10, BFS60 and FA20. XRD, SEM and EDS analysis were employed for evaluation technique. From the result of EDS analysis of cement paste at 91 days of immersion, the detected major chemical elements were Ca and S and they are assumed as composing elements of gypsum. Additionally, form the XRD analysis result, gypsum was confirmed with intensity. As the other evaluation items, compressive strength, weight change, and carbonation depth were measured for mortar specimens and BFS60 mortar showed the lowest weight change. Furthermore, in case of reduction in compressive strength, BFS60 resulted with most small reduction rate but no evidences to know the differences between specimens were confirmed from the carbonation test.

본 논문은 산성하천, 오 폐수 및 하수도 처리시설물과 같은 유해 환경하에 건설되는 콘크리트 구조물의 내구성 향상을 위한 대책의 일환으로 주로 산에 대한 침식 저항성이 우수한 시멘트계 재료의 선정을 위하여 실시한 실험적 연구 결과이다. 먼저 보통포틀랜드 시멘트와 보통포틀랜드 시멘트에 광물질혼화재 8종류를 혼합한 시멘트 페이스트 4종류를 수중 및 2% 황산용액에 재령 91일까지 침지시킨 시험편을 XRD, SEM 및 EDS 분석을 실시하여 반응생성물을 분석하였다. 그 결과, 황산용액에 침지한 시멘트 페이스트의 침식된 부위의 EDS 분석 결과 주요 원소가 Ca 및 S로써 석고로 확인되었으며, XRD 분석 결과에서도 석고 피크가 확인되었다. 또한 2% 황산용액에 침지한 4종류 모르타르 공시체의 황산 침식 저항성을 비교, 분석하기 위하여 압축강도, 중량 변화 및 중성화 깊이를 측정한 결과를 비교, 고찰하였다. 그 결과 4종류 모르타르의 중성화 깊이는 거의 유사한 값을 나타내므로써 차이를 알 수 없었으나, 압축강도 감소율 및 중량 변화율은 OPC>SF10>FA20>BFS60 순이었으며, 특히 4종류 모르타르 가운데 황산 침식 저항성은 BFS60 모르타르가 가장 좋은 결과를 나타내었다.

Keywords

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