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Materials and Structures

, Volume 42, Issue 6, pp 803–811 | Cite as

The effects of supplementary cementing materials in modifying the heat of hydration of concrete

Original Article

Abstract

This paper is intended to provide guidance on the form and extent to which supplementary cementing materials, in combination with Portland cement, modifies the rate of heat evolution during the early stages of hydration in concrete. In this investigation, concretes were prepared with fly ash, condensed silica fume and ground granulated blastfurnace slag, blended with Portland cement in proportions ranging from 5% to 80%. These concretes were subjected to heat of hydration tests under adiabatic conditions and the results were used to assess and quantify the effects of the supplementary cementing materials in altering the heat rate profiles of concrete. The paper also proposes a simplified mathematical form of the heat rate curve for blended cement binders in concrete to allow a design stage assessment of the likely early-age time–temperature profiles in large concrete structures. Such an assessment would be essential in the case of concrete structures where the potential for thermally induced cracking is of concern.

Keywords

Heat of hydration Fly ash Silica fume Slag Concrete 

Notes

Acknowledgements

The authors wish to express their gratitude to the South African cement industry, Cement and Concrete Institute, Eskom and the National Research Foundation (South Africa) for their financial and logistical support of this project.

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Copyright information

© RILEM 2008

Authors and Affiliations

  1. 1.School of Civil & Environmental EngineeringUniversity of the WitwatersrandJohannesburgSouth Africa

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