Journal of the Architectural Institute of Korea Structure & Construction (대한건축학회논문집:구조계)

Architectural Institute of Korea (대한건축학회)
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Effects of the Qualities of Ordinary Portland Cement on Chloride Migration of Offshore Concrete

시멘트의 품질특성이 해양 환경에 시공되는 콘크리트의 내염해성에 미치는 영향

  • 박상준 ((주)대우건설 기술연구원 그린빌딩연구팀) ;
  • 소광호 (원광대 건축공학과)
  • Received : 2013.09.05
  • Published : 2013.12.25
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Abstract

In this study, effects of the qualities of ordinary portland cement on chloride migration of offshore concrete were evaluated. Firstly, physical property and chemical composition of six domestic type I ordinary portland cements were investigated. And properties of chloride resistance of concrete using six cements were tested. As a result, even thought six cements met the criteria of KS L 5201, physical property and chemical composition of cements were varied with the kinds of cement. The density and fineness of cements showed $3.08g/cm^3$ to $3.15g/cm^3$ and $3,274cm^2/g$ to $3,689cm^2/g$, respectively. In mineral composition, the content of $C_3S$ and $C_2S$ showed the range of 16.1 % to 47.4 % and 21.6 % to 54.1 %, respectively. The chloride content of concrete was proportional to the chloride content of cement. Also, it could be analyzed that over 65 % of the chloride content of concrete came from cement. Compressive strength of concrete had the difference of maximum 24.8 % at age 7days and maximum 15.7 % at age 28days depending on the kinds of cement. Chloride diffusion coefficient of concrete showed the range of $11.6{\sim}15.7{\times}10^{-12}m^2/s$ at age of 7 days and the range of $4.33{\sim}5.81{\times}10^{-12}$ at age of 28 days. Based on chloride diffusion coefficient, it could be analyzed that chloride ingress time of concrete had the difference of maximum 1.5 times depending on the kinds of cement.

Keywords

Acknowledgement

Supported by : 원광대학교

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