速凝研製杉木－稻草木片水泥板之水化特性及成板性質

Hydration and Board Proper ties of Rapid Cured Cement Bonded China Fir/Rice Straw Particleboards

尹華文(Hwa-Wen Yin) ； 鄒哲宗(Che-Tsung Tsou)

《林產工業》 21卷3期 (2002/09) Pp. 189-197

摘要

本研究將杉木和稻草速凝製成水泥複合板，並探討其水合特性及適當之製板條件和成板性質。試驗分為二部份：首先以四項參數，組合成14種試驗條件，測定在不同之類型下，板坯的水合溫度及重量增加率；其次，比較各種製板條件對於成板性質之影響。結果顯示，板坯的水合溫度隨著杉木／稻草比（25/75、50/50、75/25）、二氧化碳壓力（5 kgf/cm^2、6 kgf/cm^2、7 kgf/cm^2）、水泥／材料比（2、3、4）、水灰比（0.30、0.35、0.40）之增加而上升；但當水灰比高於0.50時，二氧化碳的滲透性較差，水合溫度明顯下降。而重量增加率約為5.71%-10.11%，除了二氧化碳壓力的效應，其他參數的趨勢則與水合溫度一致。由此可知，利用水合溫度曲線和重量增加率，選取適當範圍的材料比、水泥／材料比，以及水灰比，將有助於板材之製造。在製板的三項變數中，以製板時間對於成板性質之影響最大，水泥含量次之，杉木／稻草比之影響最小；而過短的製板時間將導致不良的板性。此外，板材之24 hr吸水率為40.69%-50.31%，厚度膨脹率為0.58%-3.72%，顯示尺寸安定性良好。因此，由試驗得知：將杉木、稻草粒片與卜特蘭水泥混拌後，應用二氧化碳噴壓法可以有效、快速地製造具有尺寸安定性良好的水泥複合板。

關鍵字

疏伐木 ； 杉木 ； 稻草 ； 木片水泥板 ； 二氧化碳 ； 水合溫度 ； 重量增加率

並列摘要

Hydration characteristics, optimum manufacturing conditions and properties of cement composite particle boards made from Cunninghamia lanceolata/rice straw were investigated by rapid curing production in this study. The compatibility of the two materials was assessed with the hydration characteristics and the influence of manufacturing conditions on properties of boards was investigated. Four parameters and fourteen manufacturing conditions were used in this study, the experiment started with probing the hydration temperature and weight gain percentage of the mat, followed by comparing the properties of different manufacturing conditions on board's qualities. The results showed that the hydration temperature of the mat increased with the increasing Cunninghamia lanceolata/rice straw ratio (25/75, 50/50, 75/25), carbon dioxide pressure (5 kgf/cm^2, 6 kgf/cm^2, 7 kgf/cm^2), cement/material ratio (2, 3, 4) and water/cement ratio (0.30, 0.35, 0.40). However, when water/cement ratio exceeded 0.50 the penetrability of carbon dioxide turned worse, and as a result, the hydration temperature reduced. significantly, weight gain percentage and hydration temperature had the same trend with the parameters, except carbon dioxide pressure. These facts indicated that by applying hydration temperature curves and weight gain percentage to the selection of the optimum material ratio, cement/material ratio and water/cement ratio, which were beneficial for the manufacturing of particle board. Among the three variables of the study, manufacturing time had the greatest influence on board's properties, followed by cement level and Cunninghamia lanceolata/rice straw ratio. It partly explained why too short manufacturing time was unfavorable to the qualities of boards. In addition, the 24-hour water absorption (%) (40.69%-50.31%) and thickness swelling (%) (0.58%-3.72%) proved the dimensional stability of boards. The concluded of this study was that, by means of the carbon dioxide injection pressing process, Cunninghamia lanceolata/rice straw cement composite particle boards could be effectively and rapidly manufactured with good performance in dimensional stability.

並列關鍵字

Thinned woods ； Cunninghamia lanceolata/Rice Straw ； Cement particle boards ； Carbon dioxide ； Hydration ； Weight gain