Thermal conductivity of fiber cement mortars The results of thermal properties of the cement mortars as shown in Fig. 8 demonstrate that as the ratios of both fibers increased, the thermal conductivity coefficient reduced to 66% compared to control cement mortar.
Moreover, both fibers simi- iarly affected the thermal conductivity coefficient of the mortar: 041, 0.38 and 0.37 w/m-K for coconut coir fiber and o 40. 0.30 and 0.27 Wlm-K for oil palm fiber with the fiber weight ratios of 5%, 10% and 15% respectively. This is consistent with the physical properties previously described.
Incorporation of coco- nut coir fiber and oil palm fiber into the mixture result in the positive effect in themal conductivity of fiber cement mortars. Increasing the fiber volume in the mix proportion tends to increase pore volume leading to higher porosity and lower bulk density.
A positive effect of decreasing bulk density is a lower thermal conductivity of fiber cement product leading to better thermal insulation