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Title |
Insights for Developing Korean Portland Limestone Cement (PLC) Using Thermodynamic Modelling
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Authors |
이지훈(Jihoon Lee) ; 박준범(Junboum Park) ; 김진만(Jinman Kim) ; 문주혁(Juhyuk Moon) |
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DOI |
https://doi.org/10.4334/JKCI.2022.34.6.645 |
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Keywords |
탄소 중립; 포틀랜드 석회석 시멘트; 열역학적 모델링; 수화 반응; 비표면적 carbon neutrality; portland limestone cement; thermodynamic modelling; hydration reaction; surface area |
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Abstract |
Portland limestone cement with a maximum 35 % of limestone has been already commercialized in Europe. This study investigated the hydration reaction of type 1 ordinary Portland cement (OPC) with increasing amounts of limestone powder in order to develop a Korean Potland limestone cement. Thermodynamic modelling was utilized to predict the physical and chemical changes in the cement hydration due to the inclusion of limestone powder. Based on the mineralogical composition of the type 1 ordinary Portland cement that is being currently commercialized in South Korea, it was revealed that limestone powder did not participate in the hydration reaction, even at 15 % inclusion. Therefore, the mechanical performance has still degraded in different water to cement ratio. However, the degree of early hydration was increased with the larger surface area of clinker which resulted in reduced porosity of cement paste. Furthermore, as the C3A content in the clinker increased, a portion of the included limestone actively participated in the hydration reaction, producing monocarboaluminate, leading to a beneficial effect on material performance. It is concluded that to produce Portland limestone cement, a higher fineness, aluminate content and appropriate curing temperature is necessary to compensate for the performance degradation if there is no change in the clinker chemistry of existing Korean type 1 OPC.
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