Abstract
The mechanism of air bubbles acting during freezing and thawing cycles considering various conditions has been studied by many researchers. On the other hand, simulation of the thermal stresses in concrete with finite element software is performed where the results have proved the capability of these methods. In this paper, stresses which are induced by temperature changes in the freezing and thawing cycles are investigated for non-air and air entrained concrete. Modelling procedures were implemented considering effects of aggregates, cement paste, and boundary conditions. The results have shown that air bubbles can play important role in uniform distribution of thermal stresses in concrete which may lead to decreased maximum stress that occurs in concrete. It can also cause the plastic strains in the interfacial transition zone (ITZ) to be controlled.
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