無機聚合物是一種將鹼性溶液與含高矽、鋁或鈣材料混合後，經過溶解與聚合反應所形成的一種無水泥的膠結材料。然而，無機聚合物往往早期放熱高、乾縮劇烈、晚期強度下降。有鑑於此，本研究嘗試使用400°C煆燒之稻殼灰以體積部分取代爐石粉，混合後再與氫氧化鈉溶液和矽酸鈉溶液製成無機聚合物，期望改善無機聚合物之力學性質與乾縮性質，同時也期望解決部分稻殼棄置的問題，進一步提升稻殼灰的應用價值。本研究也探討了來自不同產地稻殼所產製稻殼灰之物化性質差異。試驗結果發現，使用不同氫氧化鈉與矽酸鈉比例的鹼激發劑影響抗壓強度，以稻殼灰部分取代爐石粉可能造成強度降低及乾縮量增加。此結果係因稻殼灰的含矽量較爐石粉高，故可能造成取代後的總矽量過多進而降低漿體的強度與增加乾縮量。若隨著稻殼灰取代量而適當調整鹼液中的氫氧化鈉與水玻璃比例，則添加稻殼灰確實能有效提高強度與降低乾縮量，甚至於添加量10%時，其28天齡期抗壓強度比控制組高。此外，結果亦顯示，不同產地之稻殼灰對於力學試驗結果影響甚微。微觀分析顯示，稻殼灰取代量與鹼激發劑混合比例皆會影響水化生成產物，但主要產物仍皆為C-S-H膠體。

Geopolymer is a material, produced by the geopolymeriziation of the mixture of the raw materials with high silica, alumina, and calcium contents and the alkali solution in the absence of the Porland cement. However, it has deficiencies, including the high heat release at eary age, the high shrinkage, and strength reduction. In view of these issues, in this study, the geopolymer was produced by replacing some portion of the slag by the rice husk ash (RHA) calcined at 400 °C by volume and then mixing that with the solution of the sodium hydroxide and the sodium silicate (water glass). It is hoped to improve the mechanical properties and shrinkage of the geopolymer, resolve the problems of processing, and increase the practical application value of waste rice husks. This study also explored the phycial and chemical properties of the RHA changed by the compositions. Results showed that the ratio of the sodium hydroxide to the water glass influenced the compressive strengths. By replacing portion of the slag with the RHA, the compressive strength was reduced and the shrinkage was increased. Such results were attributed to the high silica content of the RHA, leading to excess silica in the resulting geopolymer. With appropriate adjustments of the ratio of the sodium hydroxire to the water glass, the RHA effectively increased the strength and reduced the shrinkage. At 28 days, the 10% RHA even induced compressive strength higher than the plain. In addition, the RHA produced by the rice husk from different sources had minor differences in the mechanical properties of the geopolymer. Finally, the microstrucal analyses showed that both the amount of RHA and the ratio of the sodium hydroxide to the water glass influence the formation of the hydration products. Most of them were identified as C-S-H.

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