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Determination of apparent activation energy of concrete by isothermal calorimetry
In recent works at our laboratory, instrumentations have been developed to carry out calorimetric tests on concrete in isothermal conditions, which give much information. The objective of this article is, on the basis of this technique, to study the validity of the Arrhenius law and to determine the evolution of apparent activation energy of the concrete. This parameter is necessary for the calculation of the maturity of the concrete. Measurements of hydration heat have been carried out for various conditions of isothermal curing and have allowed us to study the evolution of apparent activation energy according to the degree of hydration. Generally, activation energy is constant for a degree of hydration ranging between 5 and 50%. On the other hand, we have observed that this parameter varied with the temperature, which limits the use of this technique to thin elements.
Determination of apparent activation energy of concrete by isothermal calorimetry
In recent works at our laboratory, instrumentations have been developed to carry out calorimetric tests on concrete in isothermal conditions, which give much information. The objective of this article is, on the basis of this technique, to study the validity of the Arrhenius law and to determine the evolution of apparent activation energy of the concrete. This parameter is necessary for the calculation of the maturity of the concrete. Measurements of hydration heat have been carried out for various conditions of isothermal curing and have allowed us to study the evolution of apparent activation energy according to the degree of hydration. Generally, activation energy is constant for a degree of hydration ranging between 5 and 50%. On the other hand, we have observed that this parameter varied with the temperature, which limits the use of this technique to thin elements.
Determination of apparent activation energy of concrete by isothermal calorimetry
Kada-Benameur, H. (author) / Wirquin, E. (author) / Duthoit, B. (author)
Cement and Concrete Research ; 30 ; 301-305
2000
5 Seiten, 12 Quellen
Article (Journal)
English
Determination of apparent activation energy of concrete by isothermal calorimetry
| British Library Online Contents | 2000
Determination of apparent activation energy of concrete by isothermal calorimetry
| Online Contents | 2000
| British Library Online Contents | 2002