Thermal conductivity of foamy materials
The thermal conductivity of cellular ash derived bricks is given in
Table 4. Thermal conductivity of the foamed samples increases with
increase in the bottom ash content. Foam BA40 shows a thermal conductivity
value of 0.075 W/m·K whereas BA70 shows 0.091 W/m·K.
The thermal conductivity decreases substantially from 0.091 W/m·K
to 0.075 W/m·K as the ash content ranges in-between 70% and 40%.
The results confirm that the thermal conductivity of foamy material is
correlated to the bulk density (Fig. 6) and a substantial decrease of the
thermal conductivity value can be achieved by incorporating an appropriate
amount of sodium silicate foaming agent.