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Title |
Experimental study for evaluation of chloride ion diffusion characteristics of concrete mix for nuclear power plant water distribution structures
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Authors |
이호재(Ho-Jae Lee) ; 서은아(Eun-A Seo) |
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DOI |
https://doi.org/10.11112/jksmi.2022.26.5.112 |
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Keywords |
원자력발전소; 콘크리트; 내구성; 염해; 확산계수; 염소이온침투 Nuclear Power Plant; Concrete; Durability; Chloride attack; Diffusion coefficient; Chloride ion penetration |
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Abstract |
In this study, the diffusion characteristics were evaluated using the concrete mix design of nuclear safety-related structures. Among the concrete structures related to nuclear power safety, we selected the composition of intake and drainage structures that are immersed in seawater or located on the tidal platform and evaluated the chloride ion permeation resistance by compressive strength and electrical conductivity and the diffusion characteristics by immersion in salt water. analyzed. Compressive strength was measured on the 1st, 7th, 14th, 28th, 56th, and 91st days until the 91st day, which is the design standard strength of the nuclear power plant concrete structure, and chloride ion permeation resistance was evaluated on the 28th and 91st. After immersing the 28-day concrete specimens in salt water for 28 days, the diffusion coefficient was derived by collecting samples at different depths and analyzing the amount of chloride. As a result, it was found that after 28 days, the long-term strength enhancement effect of the nuclear power plant concrete mix with 20% fly ash replacement was higher than that of concrete using 100% ordinary Portland cement. It was also found that the nuclear power plant concrete mix has higher chloride ion permeation resistance, lower diffusion coefficient, and higher resistance to salt damage than the concrete mix using 100% ordinary Portland cement.
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