Cement of high specific heat and high thermal conductivity, obtained by using silane and silica fume as admixtures

Cement paste of high specific heat and high thermal conductivity has been attained by using silane and silica fume as admixtures. These admixtures together cause the specific heat to increase by up to 50% and the thermal conductivity to increase by up to 38%. Silane acts to increase the specific heat and increase the thermal conductivity. Silica fume acts to increase the specific heat and decrease the thermal conductivity. Silane provides a network of covalent coupling among the silica fume particles. The network increases the compressive strength and modulus, decreases the compressive ductility, enhances heat conduction through phonons, and increases the specific heat through vibrations. (C) 2000 Elsevier Science Ltd. AII rights reserved.