Pore Structure and Hydric Characteristics of Renders with Blended Binder

Abstract

Exterior renders are protecting the load bearing parts of building constructions against the negative action of surrounding environment such is freezing-thawing action, crystallization of salts in pore system of material, biocorrosion etc. Thus sufficient mechanical properties, namely bending strength and adhesion to load bearing material’s surface, as well as durability properties are required. The paper deals with durability parameters of lime plasters modified by pozzolana and small amount of Portland cement. Such modification provided reduction of rate of liquid water transport what is promising with respect to freezing-thawing resistance of render. The water vapour diffusion coefficient was influenced just moderately.