Author(s)

E. Vejmelková, M. Keppert, P. Máca & R. Černý

Abstract

Basic physical properties, mechanical, hygric, and thermal properties of three lime plasters containing metakaolin as pozzolana admixture and provided with different amounts of hydrophobizing additive are investigated in the paper. As the designed plasters are intended for renovation of historical buildings, their properties are compared with two commercial renovation renders commonly used in the building practice. Experimental results show that using the hydrophobizing additive in the amount of 1% of the mass of binder is the most prospective solution. The porosity of this plaster meets the basic WTA requirement of 40%. Its mechanical properties are comparable with the commercial plasters. The liquid water transport properties are favourable, the water vapor transport is somewhat slower than optimal but still acceptable, the thermal properties are satisfactory. Taking into consideration that this level of properties is achieved without using any kind of cement which is in accordance with the present effort of conservators to use materials with traditional composition, one may expect that this plaster can find successful application in reconstruction of historical buildings in the future. Keywords: lime plasters, metakaolin, hydrophobizing additive, properties.

Keywords

lime plasters, metakaolin, hydrophobizing additive, properties