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Title |
Evaluation of Sulfate Resistance of Mortar with Barium Carbonate
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Authors |
김동현(Dong-Hyun Kim) ; 김형남(Hyoung-Nam Kim) ; 궁빙청(Bing Cheng Gong) |
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DOI |
https://doi.org/10.4334/JKCI.2021.33.6.601 |
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Keywords |
탄산바륨; 황산바륨; 황산염 저항성; 내구성 barium carbonate; barium sulfate; sulfate resistance; durability |
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Abstract |
This study was conducted to evaluate the sulfate resistance of mortar and paste specimens to which barium carbonate was applied. A mortar and paste containing 5, 10, and 15 % barium carbonate, including the reference specimen, were prepared, subjected to standard curing for 28 days, immersed in 5 % sodium sulfate aqueous solution, and measured from 26 weeks to 38 weeks to measure compressive strength, length change, and weight change. The change was measured and verified by performing SEM, EDAX, XRD analysis and mapping analysis. As a result of the compressive strength ratio test, it was found that the specimen to which barium carbonate was added had high sulfate resistance, and from the measurement results of length change, the addition of barium carbonate also increased the sulfate resistance. As a result of measuring the mass change of the sulphate semi-immersion, the mass of all specimens increased, and the increase was found to increase in the order of P150>BC550>BC1550>BC1050. Through SEM and EDAX analysis, it was confirmed that Ettringite and gypsum formed after immersion, and it was confirmed that barium carbonate was converted to barium sulfate. As a result of the XRD analysis, it was confirmed that less gypsum and ettringite appeared in the barium- applied paste specimen. Mapping analysis revealed that sulfate did not penetrate into the specimen to which barium was applied.
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