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Title |
Chemical Resistance of Low Heat Cement Concrete Used in Wastewater Treatment Structures Built on Reclaimed Land
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Authors |
정용택(Yongtaek Chung) ; 이병재(Byungjae Lee) ; 김윤용(Yunyong Kim) |
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DOI |
https://doi.org/10.11112/jksmi.2019.23.7.113 |
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Keywords |
저발열시멘트; 내화학성; 염소이온침투저항성; 에폭시 Low heat blended cement; Chemical resistance; Chloride ion penetration resistance; Epoxy |
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Abstract |
Concrete structures built on reclaimed land are combined with chemical erosion such as chlorine and sulfate ions from seawater. Chloride attack deteriorates the performance of the structure by corroding reinforcing bars. In addition, the waste water treatment structure has a problem that the concrete is deteriorated by the sulfate generated inside. Therefore, in this study, the characteristics and chemical resistance of low heat cement concrete used in wastewater treatment structures constructed on reclaimed land were evaluated. As a result of the experiment, the target slump and air content were satisfied under all the mixing conditions. The slump of low heat cement (LHC) concrete was higher than that of ordinary portland cement (OPC) concrete, while the air content of LHC concrete was smaller than that of OPC concrete with the same mix proportion. As a result of compressive strength test, OPC concrete showed higher strength at younger age compared to 28 days. In contrast, LHC concrete exhibited higher strength than OPC concrete at the age of 56 days. As a result of chlorine ion penetration tests, LHC-B concrete showed chlorine ion penetration resistance performance of the “very low” level at the age of 56 days. As a result of chemical resistance evaluation, when the LHC concrete is applied without epoxy treatment, chemical resistance is improved by about 18% compared to OPC concrete. In testing chemical resistance, the epoxy coated concrete exhibited less than 5% strength reduction when compared to sound concrete.
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