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Materials 2015, 8(9), 5933-5952; doi:10.3390/ma8095282

Evaluation of the Chemical and Mechanical Properties of Hardening High-Calcium Fly Ash Blended Concrete

Department of Architectural Engineering, Kangwon National University, Chuncheon-Si 200-701, Korea
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Author to whom correspondence should be addressed.
Academic Editor: Prabir Sarker
Received: 25 May 2015 / Revised: 7 July 2015 / Accepted: 13 July 2015 / Published: 7 September 2015
(This article belongs to the Special Issue Utilisation of By-Product Materials in Concrete)
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Abstract

High-calcium fly ash (FH) is the combustion residue from electric power plants burning lignite or sub-bituminous coal. As a mineral admixture, FH can be used to produce high-strength concrete and high-performance concrete. The development of chemical and mechanical properties is a crucial factor for appropriately using FH in the concrete industry. To achieve sustainable development in the concrete industry, this paper presents a theoretical model to systematically evaluate the property developments of FH blended concrete. The proposed model analyzes the cement hydration, the reaction of free CaO in FH, and the reaction of phases in FH other than free CaO. The mutual interactions among cement hydration, the reaction of free CaO in FH, and the reaction of other phases in FH are also considered through the calcium hydroxide contents and the capillary water contents. Using the hydration degree of cement, the reaction degree of free CaO in FH, and the reaction degree of other phases in FH, the proposed model evaluates the calcium hydroxide contents, the reaction degree of FH, chemically bound water, porosity, and the compressive strength of hardening concrete with different water to binder ratios and FH replacement ratios. The evaluated results are compared to experimental results, and good consistencies are found. View Full-Text
Keywords: high calcium fly ash; hydration; kinetic model; calcium hydroxide; strength; concrete high calcium fly ash; hydration; kinetic model; calcium hydroxide; strength; concrete
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

Fan, W.-J.; Wang, X.-Y.; Park, K.-B. Evaluation of the Chemical and Mechanical Properties of Hardening High-Calcium Fly Ash Blended Concrete. Materials 2015, 8, 5933-5952.

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