The Influence of Silica Fume on the Apparent Activation Energy of HPC Mixtures

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Title: The Influence of Silica Fume on the Apparent Activation Energy of HPC Mixtures

Author(s): M.P. Barbosa, R.C.A. Pinto, and L.D.P. Peres

Publication: Special Publication

Volume: 229

Issue:

Appears on pages(s): 423-434

Keywords: activation energy; cement; maturity method; silica fume

Date: 9/1/2005

Abstract:
The use of the maturity approach has been increasing in various fields of concrete construction. In order to estimate the development of a mechanical property of the concrete mixture reliably, it is necessary to previously determine the apparent activation energy of the mixture. This thermal sensitivity index is a function of several parameters including cement type, presence of admixtures, and w/c. This study investigates the influence of silica fume on the apparent activation energy of high-performance concrete mixtures. Following the procedure in ASTM C 1074, various mortar mixtures were prepared with 6 different types of Brazilian cements (CP-I-S, CP-II¬F-32, CP-II-Z-32, CP-III, CP-IV-RS e CP-V-ARI), and with addition of silica fume at two levels (8% and 16% of cement mass). The results indicate that the presence of silica fume increases the value of the apparent activation energy.