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Title |
Chloride Binding Properties of Portland Cement Binder Incorporating CaAl2O4-CaAl4O7
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Authors |
한재도(Jae-Doh Han) ; 이윤수(Yun-Su Lee) ; 이한승(Han-Seung Lee) |
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DOI |
https://doi.org/10.11112/jksmi.2020.24.4.1 |
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Keywords |
칼슘 알루미네이트; 프리델염; 칼슘 알루미네이트 시멘트 Calcium dialuminate; Friedel’s salt; Calcium aluminate cement |
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Abstract |
This study conducted to understand effects of CA (CaAl2O4) and CA2 (CaAl4O7) ratio on chloride binding ability and compressive strengthand pore structure of cement mortar incorporating mixture of CA and CA2. The Portland cement based specimens were mixed with the clinkers CAand CA2, and these calcium aluminate clinker mixture were replaced 0, 5, 10% by weight of cement. After all the test specimens were cured for 28days under water curing, they were immersed in the distilled water and NaCl solution. As a result, 28 days compressive strength of all specimens wassimilar, and As the replacement ratio of calcium aluminate clinker in the specimen increased, Friedel’s salt production tended to increase. However,it was dependent on the amount of Al2O3 in the level of 5% replacement and CA ratio in the level of 10% replacement. Through equilibrium isothermresult, it was also indicated that as replacement ratio of calcium aluminate clinker in cement matrix increased, chloride binding capacity was improved,and chloride penetration was suppressed. In this study, the specimen replaced with 10% of the calcium aluminate clinker mixture (CA 39%, CA2 60%)was remarkable to control chloride attack. We figured out necessity to understand optimal CA/CA2 ratio to effectively apply CA2 as a sustainable buildingmaterial by improving the chloride binding ability in Portland cement based system.
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