Numerical analysis of concrete temperature stress at different loading ages

Abstract

This paper investigates the thermal stresses of low-heat cement concrete under different loading ages, and thermal stresses were calculated with different compensation cycles by the Boltzmann superposition principle. An application of the Boltzmann superposition principle on the temperature stress test shows how the formulation may be used to evaluate the mechanical properties of low-heat cement concrete and how the accuracy of calculated stresses applies to measured stresses. The comparison between measured stresses and the simulated results shows good agreement under different compensation cycles, which indicates that the thermal stresses can be well estimated via the line superposition. Furthermore, these experiment results indicate that the maximum compression stresses increase rapidly with the increment of curing ages while the cracking stresses have subtle differences.