Title:
New Model for Estimating Apparent Activation Energy of Cementitious Systems
Author(s):
K. A. Riding, J. L. Poole, K. J. Folliard, M. C. G. Juenger, and A. K. Schindler
Publication:
Materials Journal
Volume:
108
Issue:
5
Appears on pages(s):
550-557
Keywords:
Activation energy; calorimetry; heat of hydration.
DOI:
10.14359/51683265
Date:
9/1/2011
Abstract:
Some predictive models for concrete temperature development and strength depend on the application of the Arrhenius equation to characterize the progress of hydration, which in turn requires an apparent activation energy Ea value to define the temperature sensitivity of the hydration reactions. Testing to determine Ea can be very time-consuming and expensive. It would be useful to have a model that estimates Ea for a given concrete mixture. To be broadly applied, such a model must account for the variable chemistry of cementitious systems. This paper describes the development of a model for Ea using multi-variate statistics analysis of experimental hydration data from 116 cementitious mixtures. The model was also validated by an independent set of hydration data from six different cementitious mixtures. The model accounts for the effects of cement chemistry, supplementary cementitious materials, and chemical admixtures.