The properties of concrete should be estimated in order to simulate the behavior of concrete structures at early age. However, it is difficult to estimate properties of concrete at early age because they change with time, temperature history, humidity and etc. In this study, a new approach is suggested in estimation of concrete properties such as final autogenous shrinkage, final creep coefficient and thermal expansion coefficient. Properties of concrete at early age are estimated by comparing between the results of analysis and experiments considering the effects of mixing material, temperature history and humidity by using thermal stress device which is able to get stress history in a chamber with various temperature history because each step of the analysis has the best values of concrete properties which would result in similar stress results between the analysis and the experiments. The results show that properties of concrete change with time at very early age which is within 1 day and then are converged to constant values.
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