The research is a study of using betel nut leaf sheath fibers which is a natural fiber used as a supplementary strength to the cement paste. The objective of this study was to develop of cement board reinforced with betel nut leaf sheath fiber for the highest flexural strength and investigations focused on parameters, fiber orientation, fiber length, volume of fiber, mixture ratio and methodology cast by pressure which controlling the volume of cement boards before and after that affect the mechanical and physical properties of boards. This research was divided into three parts. The first one was aimed at determining the fiber orientation and fiber length. In the second, investigation was conducted to determine the optimum mixture ratio at the optimum length of fiber determined in the first part. Finally, to determine the mechanical and physical properties of cement board reinforced with betel nut leaf sheath fiber. All properties of board were acceptable to use as insulating boards in accordance with ASTM C1185 and TIS 1427 and compare properties of cement board reinforced with betel nut leaf sheath fiber with commercial board and another researches. Test results indicated that the optimum mix of the composite was a mix having freeform fiber length with water-cement ratio of 0.5 and 8% fiber by volume fraction showed a higher flexural strength. The experimental investigation shows that the addition of these fibers increases moisture content, water absorption and flexural strength, while their densities and modulus of elasticity decrease.
