| Summary: | 碩士 === 國立屏東科技大學 === 木材工業系 === 93 === We investigated the manufacturing conditions and forming properties of mixing wood particle, oyster-shell powder, with cement to produce wood particle oyster-shell powder bonded cement composites (WOCCs) by using conventional process and accelerating process. The variables were used hydration temperature, chemical additive, material, and amount of filler on composite. Aquiculture wastes, cement, and wood particles were mixed in five ratios: 0/80/20, 4/76/20, 8/72/20, 12/68/20 and 16/64/20based on oven dry weight. The water/cement ratio was 0.45 and 0.35.Calcium chloride and sodium silicate were added at a level of 3 %( based on cement weight). Boards were conditioned for 1 week. According to CNS 2215 and CNS 8463 methods to investigate physical, mechanical, and sound insulation of composites. Result of tests indicated: Hydration temperature of composites manufactured by accelerated CO2 process without adding chemical additive can reach 91.9℃, hence, it without using chemical additives. Compatibility of materials is related to hydration temperature. Water absorption of these composites manufactured by conventional process was slightly higher than that of accelerated CO2 manufactured process.10% replacement of cement with oyster-shell to manufacture composites showed its strength performance was slightly lower than that of without added oyster-shell. Accelerated CO2 manufactured process improved hydration temperature of cement and accelerated hardening of cement final stage, even without calcium chloride and sodium silicate, and is more economical than conventional process. Moisture loss decreased oyster-shell amount with increased, and boards properties at 60℃ was better than 100℃by conventional process. 5% replacement of cement with oyster-shell to manufacture composites showed decrease noise at 250 - 1K (Hz) than other composites.
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