ABSTRACT

The present work evaluates the production of wood–cement particleboards (WCBs) with addition of coconut-husk fibers. Trees of a Eucalyptus urophylla × Eucalyptus grandis hybrid were used as wood source. Boards were produced with addition of five coconut-fiber levels (0%, 10%, 20%, 30%, 40% and 50%) to replace the original wood, in a completely randomized design. From each board, specimens were taken to perform physical–mechanical tests (density, water absorption, thickness swelling, static bending, compression strength, and internal bond strength). The chemical characterization of the coconut fiber – in particular the total amount of extractives – in cold and hot water and an organic solvent, along with determination of lignin, holocellulose and ash amounts. The results showed that the addition of coconut fibers significantly affected the physical–mechanical properties of the boards. For the physical properties, the addition of coconut fibers improved the dimensional stability with the respective decrease in water absorption and thickness swelling. For mechanical properties, a decrease in the MOR and MOE was observed as the percentage of coconut fibers increased, most likely due to a poor interaction between the particles and the cementitious matrix. The resulting WCBs were suitable for nonstructural and indoor uses.

摘要

目前的工作评估了添加椰壳纤维的木水泥刨花板 (WCB) 的生产。尾叶桉树 × 巨桉树杂种被用作木材来源。在完全随机设计的情况下，通过添加五种椰子纤维水平（0%、10%、20%、30%、40% 和 50%）来替代原始木材来生产板材。从每块板上取出样本进行物理机械测试（密度、吸水率、厚度膨胀、静态弯曲、压缩强度和内部结合强度）。椰子纤维在冷水和热水以及有机溶剂中的化学特性——特别是提取物的总量，以及木质素、全纤维素和灰分含量的测定。结果表明，椰子纤维的添加显着影响了木板的物理机械性能。对于物理特性，椰子纤维的添加提高了尺寸稳定性，吸水率和厚度膨胀率分别降低。对于机械性能，随着椰子纤维百分比的增加，观察到 MOR 和 MOE 降低，这很可能是由于颗粒与水泥基质之间的相互作用较差。由此产生的 WCB 适用于非结构和室内用途。