The Influence of Silica Fume on the Heat of Hydration of Portland Cement


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Title: The Influence of Silica Fume on the Heat of Hydration of Portland Cement

Author(s): M. I. Sanchez De Rojas and M. Frias

Publication: Special Publication

Volume: 153


Appears on pages(s): 829-844

Keywords: cements; fly ash; heat of hydration; portland cement; silica fume; Materials Research

Date: 6/1/1995

Exothermal reactions take place during cement hydration and heat the cement mass. This temperature increase, from the initial moment of setting until the hardening of the cement, causes shrinkage which contributes to the cracks that can be seen in some constructions that are made of large masses of concrete or cement rich mixtures. The use of pozzolans reduces the heat given off by the cements during hydration. However, the reactions of the pozzolanic materials with the lime also produce heat; the decrease should not be proportional to the level of clinker substitution in the mixed cements. The first hours show that most of the additions, which present higher activity at early stages, increase the hydration heat of the mixed cements in relation to the control cement. The effect of different silica fumes on the hydration heat with respect to a control cement and other pozzolanic materials was studied and is presented in this paper.