The purpose of this study was to improve the mechanical characteristics and moisture resistance of parawood particle (PWP) cement composite board developed by the authors. PWP cement composites were prepared with a mixture containing 15.0% parawood particles, 43.0% cement, 41.2% water, and 0.86% CaCl2 (by weight) and the PWP cement composite boards were internally reinforced with bidirectional glass fiber woven roving [0°/90°]. The board properties were evaluated under accelerated aging with wet-dry cycles to establish the durability and moisture resistance and the effect on flexural strength of the composite boards. The mechanical characteristics determined were the equivalent modulus of rupture (eMOR), the equivalent modulus of elasticity (eMOE), and the deformability factor (DF). The experimental results suggest that the strength and stiffness of the PWP composite boards with internal reinforcement are four times higher than those of the original PWP composite boards under accelerated aging based on 100 wet-dry cycles, implying better durability of the boards in outdoor use. The results provide a baseline to which improved formulations and reinforcements or designs can be compared using the same measurement methodology. 1. Introduction Para rubberwood is extensively cultivated in South-East Asian countries, where most of the world’s rubber tree plantations are currently located. The trees have a limited service life due to their eventual loss of productivity, and they need to be felled to make land available for replanting. Only a small part of the wood materials from felled trees can be used as timber, and converting trees to timber generates a large though biodegradable waste stream of sawdust, chips, trimmings, branches, and even whole trunks. These can be used as fuel or disposed of in landfills, but increasing the range of value-added uses as filler or fibrous reinforcement in composites would be a better option, for both economic and environmental reasons. Recently, there has been considerable interest and active research into a type of material used for construction and decorative materials known as cement composites. In previous research on cement composites incorporating wood wastes, concrete mixes with ground hazelnut shell, wood sawdust, and tea wastes have been experimentally investigated and their mechanical properties determined [1]. When wood particles from construction wastes were bonded with cement to form composites, the load-deflection characteristics demonstrated elastoplastic behavior [2]. Composite boards with rice straw and
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