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Infrastructures 2018, 3(2), 8; https://doi.org/10.3390/infrastructures3020008

Novelties in Material Development for Massive Concrete Structures: Reduction in Heat of Hydration Observed in Ternary Replacement Mixtures

College of Engineering, University of Georgia, Athens, GA 30602, USA
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Received: 27 February 2018 / Revised: 25 March 2018 / Accepted: 26 March 2018 / Published: 28 March 2018
(This article belongs to the Special Issue Concrete Structures: Present and Future Trends)
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Abstract

As the size of modern infrastructure increases, novelties related to mass concrete mixtures including supplementary cementitious materials (SCMs) become critical. The effects of binary and ternary cement replacement mixtures including metakaolin, silica fume, ground calcium carbonate, granulated blast furnace slag, and fly ash on the rate and amount of heat generated in concrete mixtures are investigated. Twenty three binary and ternary mixtures with a water-to-cementitious binder ratio of 0.43 are evaluated. Between 15% and 45% cement replacement by weight is considered. Results indicate that binary mixtures containing metakaolin or silica fume offer no advantage in reducing the amount of heat but increase compressive strength by 20%. On contrary, ternary mixtures, including two pozzolanic materials, provide 15% reduction in the amount of heat evolution without compromising strength. This reduction is observed regardless of alumina (Al) or silica (Si) content in pozzolanic materials when 45% cement is replaced with a combination of slag and metakaolin, or slag and silica fume. Furthermore, the effect of increased calcium (Ca) content is investigated. It is concluded that ternary mixtures with decreased Ca/(Al+Si) ratio reduce internal temperature in mass concrete structures and are less likely to be exposed to the threshold temperature for delayed ettringite formation. View Full-Text
Keywords: heat of hydration; ternary mixtures; binary mixtures; supplementary cementitious materials; mass concrete; cement replacement; metakaolin; silica fume; compressive strength; material development heat of hydration; ternary mixtures; binary mixtures; supplementary cementitious materials; mass concrete; cement replacement; metakaolin; silica fume; compressive strength; material development
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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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Hamid, H.; Chorzepa, M.G.; Sullivan, M.; Durham, S.; Kim, S.S. Novelties in Material Development for Massive Concrete Structures: Reduction in Heat of Hydration Observed in Ternary Replacement Mixtures. Infrastructures 2018, 3, 8.

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