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Heat release of later-age concrete and the concrete strength development

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The adiabatic temperature rise of early-age concrete can be precisely tested by an adiabatic temperature measuring device. There are many types of those devices, with the only objective to make the specimen's ambient temperature equal to the central temperature. However, the insufficient accuracy of testing device can lead to inaccurate measurements of adiabatic temperature rise of later-age concrete. The previous models to solve this problem are mainly based on fitting and back analysis. However, previous data cannot precisely represent the latter data when using fitting and back analysis method in all cases. Although the adiabatic temperature rise of later-age moderate heat concrete could not be measured accurately, considering the heat release of the concrete is accomplished with the increment of the concrete strength, the relationship between concrete strength development and hydration heat release can be studied to predict the heat release of later-age concrete. And the strength of the later-age concrete can be precisely tested. Based on the previous studies, by studying the relationship between cementitious materials and concrete's thermal and mechanical behavior, a preliminary later-age hydration heat model has been been established. The correction of the model was verified through experiments. The research results of this paper also show that the long-term strength development of concrete containing dicalcium silicate (Ca2SiO4) or mixed with fly ash, as well as its lower hydration heat in the early stage, was beneficial for improving the pipe cooling effectand controlling temperature peaks in the early stages. However, the pipe cooling time needed to be extended in order to eliminate the adverse effect caused by long-term hydration heat. This achieve can be used in temperature control of mass concrete structures such as the concrete present in dams.

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Reference: Zhu, Z.; et al. (2016). A Study on Relationship Between the Heat Release of Later-age Concrete and the Concrete Strength Development, Open Constr. Build Tech. J., DOI: 10.2174/1874836801610010363

For more information about the article, please visit http://www.benthamopen.com/ABSTRACT/TOBCTJ-10-363

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