A Parameter-Free Multiscale Framework for the Self-Desiccation in Cementitious Materials

Traditionally self-desiccation is predicted by the simulations of hygro-mechanics directly at the macro-scale providing hydration-related inputs via phenomenological constitutive models. Instead a novel method is here proposed that consists of obtaining inputs to such constitutive relations from direct simulations of cement hydration at the micro-scale using Cement Hydration in Three Dimensions (CEMHYD3D) model. This allows avoiding lengthy calibrations from experimental data. The prediction capabilities of the proposed model are demonstrated using experimental data of self-desiccation relevant to many different mix designs of concrete, mortar and cement paste, with water to cement ratios ranging from 0.20 to 0.68 and silica fume to cement ratios from 0.0 to 0.39.