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Title |
Properties of Strength Development of Concrete at Early Age Using High Fineness Cement and Fly Ash
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Authors |
하정수(Jung-Soo Ha) ; 김한식(Han-Sic Kim) ; 이영도(Young-Do Lee) |
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DOI |
https://doi.org/10.11112/jksmi.2018.22.2.154 |
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Keywords |
고분말도 시멘트 ; 플라이애시 ; 조기강도 High fineness cement ; Fly ash ; Early age strength |
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Abstract |
Cement industries are considered key industries for reducing carbon emissions, and efforts are off the ground to reduce the use of cement in the concrete sector. As a part of this effort, research is off the ground to utilize a large amount of industrial by-products that can be used as a substitute for a part of cement. Concrete using industrial by-products has advantages such as durability, environment friendliness and economical efficiency, but there are problems such as retarding and early-age strength deterioration. Therefore, this study aimed to reduce the use of cement and solve the problem of early-age strength deterioration while using fly ash, which is an industrial by-product. Accordingly, it was confirmed that the strength was improved at all ages irrespective of curing temperature by accelerating the hydration reaction by using high fineness cement. Subsequently, high fineness cement was partially replaced with fly ash and the strength development characteristics were examined. As a result, it was possible to exhibit strength equal to or higher than ordinary portland cement even at the early age. Also, it was confirmed that even when the fly ash is replaced by 30%, it is possible to shorten the time for dismantling the forms of vertical and horizontal members.
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