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Title |
Determination of Water-to-Binder Ratios on the Equivalent Compressive Strength of Concrete with Supplementary Cementitious Materials
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Authors |
윤현섭(Hyun-Sub Yoon) ; 양근혁(Keun-Hyeok Yang) |
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DOI |
http://dx.doi.org/10.4334/JKCI.2015.27.6.687 |
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Keywords |
등가 압축강도 ; k-값 ; 물-결합재비 ; 플라이애쉬 ; 고로슬래그 equivalent compressive strength ; k-value ; water-to-binder ratio ; fly ash ; slag |
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Abstract |
The present study proposed a k-value to determine the water-to-binder ratio of concrete using fly ash (FA) or ground granulated blast-furnace slag (GGBS) as a partial replacement of ordinary portland cement (OPC) with regard to an equivalent strength of OPC concrete. From the regression analysis using an extensive database including 7076 concrete mixes, k-values were determined for various water-to-binder ratios when the replacement ratio of OPC by the addition of FA or GGBS were below 50%. For deriving an equation to identify k-value, the relationship of concrete compressive strength and water-to-binder ratio was generalized by an exponential function. In general, k-values decreased with the increases in the addition of FA or GGBS for replacement of OPC and water-to-binder ratio. The rate in decreasing k-value against water-to-binder ratio was marginally affected by the addition of FA or GGBS, although a higher k-value was commonly obtained for GGBS concrete than for FA concrete at the same water-to-binder ratio. Consequently, the determined k-values were simplified as a function of water-to-binder ratio and the addition ratio of FA or GGBS as replacement of OPC.
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