Abstract
This paper presents results of tests and research conducted on three cement-based mortars. At first, moisture sorption was measured at 20°C and six relative humidity levels of the air. The tests were completed with a mathematical description of obtained sorption isotherms. Then, thermal conductivity coefficients λ were measured with stationary and non-stationary techniques on samples of various moisture degree. A linear dependence between coefficient λ and material moisture was determined. Component results of these two stages of research helped determine a mathematical dependence of the thermal conductivity coefficient upon the relative humidity of the tested materials.
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