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The experimental results of the thermal conductivities of xonotlite-type calcium silicate insulation materials were pre-sented at different temperatures and pressures. Two appropriative surroundings, i.e. an elevated temperature surrounding from ambi-ent temperature to 1450 K and a vacuum surrounding from atmosphere pressure to 10-3 Pa, were designed for the transient hot-strip (THS) method. The thermal conductivities of xonotlite-type calcium silicate with four densities from ambient temperature to 1000 K and 0.045 Pa to atmospheric pressure were measured. The results show that the thermal conductivity of xonotlite-type calcium sili-cate decreases apparently with the fall of density, and decreases apparently with the drop of pressure, and reaches the least value at about 100 Pa. The thermal conductivity of xonotlite-type calcium silicate increases almost linearly with T3, and increases more abundantly with low density than with high density. The thermal conductivity measurement uncertainty is estimated to be approxi-mately 3% at ambient temperature, and 6% at 800 K.
The experimental results of the thermal conductivities of xonotlite-type calcium silicate insulation materials were pre-sented at different temperatures and pressures. Two appropriative surroundings, ie an elevated temperature surrounding from ambi-ent temperature to 1450 K and a vacuum surrounding from atmosphere pressure to 10-3 Pa, were designed for the transient hot-strip (THS) method. The thermal conductivities of xonotlite-type calcium silicate with four densities from ambient temperature to 1000 K and 0.045 Pa to atmospheric pressure were measured. The results show that the thermal conductivity of xonotlite-type calcium sili-cate decreases apparently with the fall of density, and decreases apparently with the drop of pressure, and reaches the least value at about 100 Pa. The thermal conductivity of xonotlite-type calcium silicate increases almost linearly with T3, and increases more abundantly with low density than with high density. The thermal conductivity measurement uncert ainty estimated to be approxi-mately 3% at ambient temperature, and 6% at 800 K.