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Title |
An Experimental Study on the Influence of the Qualities of Ordinary Portland Cement on the Flowability of High Flow Concrete
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Keywords |
보통 포틀랜드 시멘트 ; 고유동 콘크리트 ; 고성능AE감수제 ; 분말도 ; 간극상 ordinary portland cement ; high flow concrete ; superplasticizer ; brain ; interstitial phase |
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Abstract |
Recently, due to developments in construction technology, the use of high-performance concrete became popular. High-performance concrete when compared to the ordinary concrete can better satisfy required performances by using mineral admixture and superplasticizer. Various studies on the effect of admixture materials on the quality of high-performance concrete have been reported. But there exist limited number of reported results on the effect of cement qualities, which is the most important constituent material in concrete. Therefore, in this study, the relationship between the quality of cement and the flowability of high flowing concrete is investigated. Qualities of domestically produced cement were identified, and then the influence of the qualities of cement on the flowability of high flowing concrete is evaluated. The result showed that the dosage of required superplasticizer was dependent on cement fineness, to brain, free-CaO, and interstitial phase, which all trigger initial hydration process of cement. Particularly, the results showed that fineness of cement has a high impact on the dosage of the superplasticizer. For strength property of concrete, the dosage of superplasticizer had a significant effect on the early age strength, but had negligible effect in the long term strength.
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