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Materials 2015, 8(3), 1213-1229; doi:10.3390/ma8031213

Analysis of the Optimum Usage of Slag for the Compressive Strength of Concrete

1
Department of Architectural Engineering, Hanyang University, Ansan-Si 425-791, Korea
2
Department of Architectural Engineering, Kangwon National University, Chuncheon-Si 200-701, Korea
3
Structural Engineering Research Division, Korea Institute of Construction Technology, Goyang-Si 411-712, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Javier Narciso
Received: 16 December 2014 / Accepted: 12 March 2015 / Published: 18 March 2015
(This article belongs to the Section Advanced Composites)
View Full-Text   |   Download PDF [923 KB, uploaded 18 March 2015]   |  

Abstract

Ground granulated blast furnace slag is widely used as a mineral admixture to replace partial Portland cement in the concrete industry. As the amount of slag increases, the late-age compressive strength of concrete mixtures increases. However, after an optimum point, any further increase in slag does not improve the late-age compressive strength. This optimum replacement ratio of slag is a crucial factor for its efficient use in the concrete industry. This paper proposes a numerical procedure to analyze the optimum usage of slag for the compressive strength of concrete. This numerical procedure starts with a blended hydration model that simulates cement hydration, slag reaction, and interactions between cement hydration and slag reaction. The amount of calcium silicate hydrate (CSH) is calculated considering the contributions from cement hydration and slag reaction. Then, by using the CSH contents, the compressive strength of the slag-blended concrete is evaluated. Finally, based on the parameter analysis of the compressive strength development of concrete with different slag inclusions, the optimum usage of slag in concrete mixtures is determined to be approximately 40% of the total binder content. The proposed model is verified through experimental results of the compressive strength of slag-blended concrete with different water-to-binder ratios and different slag inclusions. View Full-Text
Keywords: slag; concrete; optimum usage; compressive strength; hydration model slag; concrete; optimum usage; compressive strength; hydration model
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Lee, H.-S.; Wang, X.-Y.; Zhang, L.-N.; Koh, K.-T. Analysis of the Optimum Usage of Slag for the Compressive Strength of Concrete. Materials 2015, 8, 1213-1229.

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