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Title |
An Experimental Study on the Quality Properties of High Strength Concrete by the Replacement Ratio SFFB as Substitutes of Silica-fume
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Keywords |
실리카 흄 무혼입 결합재(SFFB),실리카 흄 ; 초고강도 콘크리트 ; 자기수축 ; Silica Fume Free Binder(SFFB) ; Silica Fume ; Ultra High Strength ; Autogenous Shrinkage |
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Abstract |
This study set up 25, 35% for silica fume, SFFB's 2 level and water-combination material ratio, silica fume 10% for substitution ratio, and 4 level of SFFB 5, 10, 15(%) in order to compare and analyze the quality characteristic of ultra high strength concrete according to the substitution ratio of silica fume free binder (SFFB) that can be utilized as a substitute material for silica fume. As a result of an experimentation, the lower water-combination material ratio was, the higher addition ratio of high performance water-reducing agent for securing target liquidity increased, and it indicated the tendency that addition ratio of high performance water-reducing agent decreases because of material characteristic that SFFB has a lower absorptiveness than silica fume. The best strength was shown when SFFB substitution ratio is 10% at compressive strength and when substitution ratio is 15% at tensile strength, and it was indicated that at autogenous shrinkage contraction decreases compared to Plain(SF) regardless of substitution ratio of W/B and SFFB.
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