Autogenous deformation-induced stress evolution in cementitious materials considering viscoelastic properties
A review of experiments and models
M. Liang (TU Delft - Materials and Environment)
J. Xie (TU Delft - Materials and Environment)
Shan He (TU Delft - Materials and Environment)
Y. Chen (TU Delft - Materials and Environment)
Erik Schlangen (TU Delft - Materials and Environment)
Branko Savija (TU Delft - Materials and Environment)
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Abstract
Early-age cracking risk induced by autogenous deformation is high for cementitious materials of low water-binder ratios. The autogenous deformation, viscoelastic properties, and stress evolution are three important factors for understanding and quantifying the early-age cracking risk. This paper systematically reviewed the experimental and modelling techniques of the three factors. It is found that the Temperature Stress Testing Machine is a unified experimental method for all these three factors, with a strain-controlled mode for stress evolution, hourly-repeated loading scheme for viscoelastic properties, and free condition for autogenous deformation. Such unified method provides basis for developing various models. By coupling a hydration model for volume fractions of hydrates, a homogenization model for upscaling of viscoelastic properties, and capillary pressure theory for self-desiccation shrinkage, a unified model directly mapping the mix design to the early-age stress can be constructed, which can help optimize the mix design to reduce the early-age cracking risk.
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