Author(s)

J. Kočí, V. Kočí, J. Maděra, P. Rovnaníková & R. Černý

Abstract

A combined computational-experimental approach for service life estimate of surface layers of historical building made from renovation renders is presented in the paper. The experimental part is aimed at estimation of the durability of two commercial systems of double layered renovation renders in terms of their frost resistance. The computational part includes calculation of number of freeze-thaw cycles that may occur in surface layers during a reference year. To achieve this, a diffusion-type model of coupled heat and moisture transport is used. The computations are performed on historical load-bearing structure made of sandstone, brick or arenaceous marl, finished by two different hydrophobic renovation render systems. Keywords: service life estimate, renovation renders, heat and moisture transport, experimental analysis. 1 Introduction In the current practice of reconstruction of surface layers of historical buildings it is necessary to take into account some aspects, which are mostly controlled by monument care authorities. In the first place the proper material must be chosen, which is convenient according to authority’s rules. The second is preserving of the original treatments and compound formulas. The choice of materials for reconstruction is then more or less ruled by supervisory authorities, which mostly choose such material that was suitable at an application on some other building before. The durability of new surface layers made of renovation renders

Keywords

service life estimate, renovation renders, heat and moisture transport, experimental analysis