Differential hydration in rendering mortars

Abstract

The disorders which affect the renderings arise from the inconsistent deformations that appear in the multilayer system rendering-substrate and from the differential hydration of the binder. The latter finds its origin in the heterogeneity of the mortar in place, resulting from the variations of characteristic parameters of mortar, substrate and placing conditions. These variations yield local modifications of the mode of rendering mortar desiccation and lead to juxtaposition of materials which rapidly acquire different behaviours.