Abstract
A multi$scale constitutive model is improved based on early age hydration and moisture state in micro$pores. It is found that the original model underestimates autogenous shrinkage at initial days. Therefore the contribution of chemical shrinkage at early age is discussed and added. Besides, long time shrinkage is modified, considering driving forces acting on pores with different radii respectively, such as capillary tension and disjoining pressure. With the improved model, autogenous and drying shrinkage with various w/c ratios and relative humidity can be simulated reasonably.
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