Thermal conductivity of concrete: Effect of moisture

Abstract

The thermal conductivity λ of eight concrete specimens, containing Pellite, limestone or quartz aggregate with and without air entraining agent, varying in density from 1550 to 2350 kg m^-3, have been measured at several moisture contents between 0.04 and 15.5 per cent by volume. Although λ increased with increasing moisture content, the change was much less than that predicted by the Jakob factors. In general, the moisture factors were found to be density dependent and to increase with decreasing density. A general expression has been derived relating the moisture factor to both density and moisture content by volume over the range 0-5%.