多年生莿竹粒片水泥板之性質

本研究以多年生莿竹再利用為主，透過其外觀型態、微觀型態及機械性質試驗，探討竹齡辦別之可行性，並促進莿竹應用。以多年生莿竹、莿竹副資材、桃花心木副資材及臺灣杉副資材作為原料，經破碎處理加工成木竹材粒片，以木竹材粒片與水泥混合量比例30：70及50：50，製成粒片水泥板，為促進水泥與粒片反應，添加水泥重量5％之矽酸鈉(Na2SiO3)及5％氯化鈣(CaCl2)。後續探討粒片水泥板之物理及機械性質，以利未來對木竹副資材的應用，並提升其附加價值。多年生莿竹、莿竹副資材、桃花心木副資材及臺灣杉副資材在兩種水泥板比例粒片水泥板之物理性質及機械性質試驗，試驗包含容積密度、吸水後度膨脹率、吸水長度變化率、吸水率、抗彎強度及表面硬度，以單因子變異數分析進行統計。研究結果顯示容積密度、吸水率、抗彎強度及表面硬度皆呈現顯著差異，而吸水後度膨脹率及吸水長度變化率無顯著差異。以莿竹、桃花心木及臺灣杉副資材進行比較時，莿竹表現了良好的性質，不論是在30％粒片添加量與70％粒片添加量，或是50％粒片添加量與50％粒片添加量，皆展現良好的疏水性及機械強度，為後續粒片水泥板應用，莿竹可作為材料選擇之一。

關鍵字

多年生莿竹；林業副資材；粒片水泥板；老竹識別

並列摘要

This study focuses on the reuse of perennial bamboo by examining its physical characteristics, microstructure, and mechanical properties to explore the feasibility of distinguishing bamboo ages and promote its application. Additionally, perennial Bambusa stenostachya, along with by-products of Bambusa stenostachya, Swietenia macrophylla, and Taiwania cryptomerioides, are used as raw materials. They are processed into wood-bamboo particle chips and mixed with cement in ratios of 30:70 and 50:50 and produced into particle cement boards. To enhance the reaction between cement and particles, 5% of sodium silicate (Na2SiO3) and 5% of calcium chloride (CaCl2) by weight of cement are added. Subsequent tests investigate the physical and mechanical properties of the particle cement boards to facilitate future applications of wood-bamboo by-products and enhance their added value. The physical and mechanical properties of the two types of particle cement boards with different bamboo ratios, along with Bambusa stenostachya by-products, mahogany, and Taiwan cedar by-products are tested. Tests include bulk density, expansion rate after water absorption, length change rate after water absorption, water absorption rate, flexural strength, and surface hardness, analyzed statistically using one-way analysis of variance. Results show significant differences in bulk density, water absorption rate, flexural strength, and surface hardness, while no significant differences are observed in expansion rate and length change rate after water absorption. When comparing Bambusa stenostachya with mahogany and Taiwan cedar by- products, Bambusa stenostachya demonstrates excellent properties, showing good hydrophobicity and mechanical strength regardless of the particle addition ratios of 30% to 70% or 50% to 50%. Thus, Bambusa stenostachya can be chosen as one of the materials for subsequent particle cement board applications.