稻殼（rice husk，RH）富含矽元素，且為多孔結構，具備輕質特性，適合作為鈣矽水合漿體中輕質摻料。然而稻殼內含有大量有機物質，此類成分於高溫高鹼環境下會溶解至漿體中，使水泥顆粒表面被薄層覆蓋，導致系統中水泥水化作用受到干擾，進而影響製品強度。為克服上述問題，本研究將稻殼進行熱解處理生成稻殼炭（rice husk char，RHC）後再行添加，最後評估使用輕質摻料取代原製程中發泡鋁粉之可行性，以降低材料開發成本，並開發農業資材利用價值。

本研究以氫氧化鈣（Ca(OH)2）、二氧化矽（SiO2）、水泥（cement）等乾基材料進行鈣矽水合漿體產製，得知於12 atm、12 h條件進行養護時，製品擁有最佳抗壓強度，其Ca/Si為0.894，此為後續鈣矽調質之依據。將不同粒徑之稻殼RH1（>1.19 mm）、RH2（0.59~1.19 mm）、RH3（0.297~0.59 mm）及RH4（<0.297 mm）分別添加至鈣矽水合漿體中，並藉調升水固比（water to solids ratio，W/S）來探討稻殼粒徑與拌合水量對製品特性之影響。後續使用熱解條件為300~500℃之稻殼炭進行添加，探討其對製品抗壓強度之影響。最終綜合不同輕質摻料種類及蒸養條件所產製之製品結果，歸納最適蒸養條件，並測試輕質工程材料之隔熱、調濕等功能性。
 
研究結果顯示，在添加輕質摻料後，製品抗壓強度及密度均會有所下降。當W/S = 0.7 L/kg，稻殼及稻殼炭至少添加12 wt.%至鈣矽水合漿體時能符合AAC-6之規範，在調升W/S = 0.75 L/kg後，僅需添加4 wt.%稻殼即可符合AAC-6，其中RH1製品性能表現（performance factor，Pf）高出其他粒徑製品，粒徑越細對於製品強度發展越具不利影響；另以500℃熱解溫度產製之BC500，其製品性能表現則高於其他熱解溫度之稻殼炭製品。經鈣矽調質程序，將系統Ca/Si控制為0.894後，添加量為4~20 wt.% 之RH1及BC500製品分別可再提升8.22~26.71及9.12~31.84% 之抗壓強度。相較於鈣矽水合漿體，當添加12 wt.%稻殼時，於6 atm、20 h條件進行養護擁有最佳製品性能表現，顯示低溫下較有利稻殼製品強度發展，此時為13.33 MPa/g/cm3；添加12 wt.% 稻殼炭則可縮短水熱反應時間，於12 atm、8 h條件進行養護擁有最佳製品性能表現，此時為24.82 MPa/g/cm3。添加12 wt.%稻殼及稻殼炭之水合漿體製品導熱係數分別由0.88降至0.49及0.43 W/m‧K，而調濕特性則是在添加最少8 wt.% 稻殼炭時能夠符合JIS-A 1470-1調濕材料level 1之規範。綜合而言，稻殼及稻殼炭均能夠替代鋁粉發泡角色以提供製品輕質效果，藉此達到降低開發成本之目的，且摻料多孔、高比表面積之特性有助提升材料隔熱、調濕等功能，具有工程應用價值及環境友善性。

Rice husk (RH) is rich in silicon, and it has a porous structure with light-weight characteristics, suitable for using as light-weight admixtures. When using 12 atm and 12 h for curing, it has the highest performance factor (Pf) before adding the admixture. At this time, Ca/Si is 0.894. Because rice husk contains a large of organic matters that will cause a decrease of compressive strength, we pyrolyzed the rice husk into char and added. When W/S (water solid ratio) = 0.7 L/kg, rice husk and its char should be added at least 12 wt.% to meet the AAC-6 specification. The Pf of RH1 products is higher than that of other particle size products; the Pf of BC500 products is higher than other pyrolysis temperature rice husk char products. After the calcium and silicon conditioning process, the Ca/Si is controlled to 0.894, and the RH1 and BC500 products with an addition amount of 20 wt.% can increase the compressive strength of 26.71 and 31.84%, respectively. When adding 12 wt.% rice husk and curing at 6 atm for 20 h, the specimens has the highest Pf which is 13.33 MPa/g/cm3; adding 12 wt.% rice husk char can shorten the reaction time, when curing at 12 atm for 8 h has the highest Pf which is 24.82 MPa/g/cm3. The thermal conductivity of 12 wt.% rice husk and rice husk char products was reduced from 0.88 to 0.49 and 0.43 W/m‧K, respectively. It can comply with JIS-A 1470-1 specification when adding at least 8 wt.% rice husk char.

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