The waste oil palm residue extracted from the pure oil palm represents 12 percent of the oil palm bunch and can be used for other purposes such as fiber production or fuel .
Therefore, once the use of these natural materials increases, the production costs will be reduced and natural fiber will be a viable alternative to synthetic materials, which waste both energy and resources in their production.
Material and methods.The materials used in this study included ASTM Type 1 Portland cement, lime- stone powder, sand, water and natural fibers at the levels of 5x, 10x and 15x by weight of binder ASTM C494 Type G high-range water reducer was used to make the fiber uniformly distributed. The water-binder(wlb) ratio was o.25, which is applicable for fiber cement materials in the manufacture of roof sheets and sidings. Mix proportions of natural fiber cement mortars studied are summarized in Table 1. OPC denotes the control cement mortar mixed with Portland cement Type 1. C(x) and POx) denote cement mortars in which coconut coir fiber and oil palm fiber, respectively, were used as Portland cement replacements at x by weight of binder. The physical and mechanical properties of cement mortars were performed in accordance with ASTM c20 and ASIM c109 deter mine the optimal fiber-to-cement weight ratio of fiber cement mortar The second experiment, following JISR 2618 standards examined their thermal properties.In accordance with JIS R 2618 standards, they were also tested using the TCA(Thermal Constant Analysis) technique to assess the thermal conductivity of each e when mixed with varying proportions(5-15r) of coconut coir fiber and oil palm residue to calculare their thermal conductivity coeffidents for comparison.