Effect of pozzolanic admixtures on mechanical, thermal and hygric properties of lime plasters

Compressive and bending strength, thermal conductivity, specific heat capacity, water sorptivity, moisture diffusivity, water vapor diffusion coefficient, sorption isotherms, and linear thermal and hygric expansion coefficients of three lime plasters with pozzolanic admixtures are determined in the paper. Comparative measurements with common lime plaster are done as well. On the basis of the experiments performed, it can be concluded that all the three analyzed lime-pozzolana plasters are suitable for an application in reconstruction of historical buildings. While their mechanical properties are significantly better compared to the reference lime plaster, their thermal and hygric properties are mostly similar or slightly improved. The only parameter that is found to be worse than for the common lime plaster is the linear hygric expansion coefficient but its worsening can be matched by the improved mechanical properties.