本研究以氫氧化鈉溶液及矽酸鈉溶液(水玻璃)等鹼性溶液，於固定液固比下，激發爐灰粉體製作鹼激發爐灰漿體材料，探討不同鹼激發量、水玻璃模數及爐石粉飛灰混合比等參數變化，對鹼激發爐灰漿體材料新拌及硬固性質之影響，並探討於不同高溫度環境下持溫1.5小時後之爐灰漿體材料性質變化，同時亦以微觀試驗觀察鹼激發爐灰漿體材料組成成分及微觀結構之變化。
研究結果顯示：(1)新拌性質方面，鹼激發爐灰漿體材料新拌流度值在145 mm至248 mm之間；初凝與終凝時間分別為4~46分鐘與15~54分鐘之間，增加鹼激發量會降低流度性能與縮短凝結時間。(2)鹼激發爐灰漿體材料試驗組之28天齡期抗壓強度在28.4~82.05 MPa之間，增加溶液鹼濃度可提升材料強度，但因飛灰惰性材料特性使得飛灰組別之強度皆低於全爐石組，50%飛灰混合降低28天抗壓強度34.1~38%之間。(3)全試驗組之鹼激發爐灰熱傳導係數範圍在0.701~0.793 w/m•k之間，低於一般傳統混凝土之約20~53%，顯示材料具良好隔熱性能，且粉體混合比例對係數之影響性大於溶液配比因子。(4)乾縮性能試驗結果顯示，鹼溶液參數中水玻璃模數與鹼激發量增加皆會提升漿體材料乾縮量，28天較3天齡期增加1.25~2.41倍，飛灰粉體比例增加可降低乾縮量。(5)在高溫作用下，全爐石組之高溫後強度皆低於同齡期常溫強度，但爐灰混合組別之強度較高，試驗組中承受100 oC後最高抗壓強度之最佳爐灰比例為9:1，而在承受200、400及600 oC下之最佳強度之爐灰比例為7:3，顯示鹼激發爐灰漿體材料具有較佳承受高溫環境特性。(6)由顯微鏡照片顯示，在常溫環境中混合飛灰之鹼激發漿體材料有眾多未溶解飛灰球顆粒存在，因此降低漿體材料力學性質，但因顆粒填充效果與中空球特性可增加材料體積穩定性及隔熱性能。

In this study, the sodium hydroxide and sodium silicate were used as the alkali activator to activate the blended powder of slag and fly ash. Under the condition of fixed liquid-solid ratio, experimental parameters including different dosages of activator, moduli of sodium silicate and proportions of slag-fly ash mixtures were used to investigate the effects of various combinations of parameters on the fresh and hardened properties of alkali activated paste. The second is to investigate the effects of exposure to various elevated temperatures for 1.5 hour on the properties of alkali-activated paste. Finally, the variations of chemical compositions and microstructures of alkali-activated paste were examined by the microstructural analyses.
The research results show that: (1) For the fresh properties, the flowabilities of alkali-activated slag-fiy ash paste were in the range from 145 to 248 mm, the initial and finial setting times of paste were from 4 to 46 and 15 to 54 min, respectively. Increase of dosages of activator could decrease the flowability and setting times. (2) The increase of dosages of activator could enhance the material strength, and the compressive strngths of all mixture at 28 days were in the range from 28.4 to 82.05 MPa. However, when the slag powder mixed with fly ash had lower strength with the amount of fly ash replacement by 50%, the compressive strength at 28 days were decreased by 34.1 to 38%. (3) The thermal conductivity of all mixture were in range from 0.701 to 0.793 w/m•k, and the results were lower than that of normal concrete by 20 to 53%, which showed that alkali-activated slag-fiy ash paste has excellent insulation properties. In addition, the properties of thermal conductivity were controlled by composition of powder material. (4) The results of drying shrinkage test indicated that the increase of activator dosages could increase the drying shrinkage and the increase of drying shrinkage by 1.25 to 2.41 times from ages of 3 to 28 days, but specimens added with fly ash significantly decreased the drying shrinkage. (5) The compressive strength of slag-based alkali-activated material after exposoure to elevated temperature were lower than these of ambient temperature, but the compressive strengths of slag-fly ash alkali-activated material were higher. The optimum powder ratio of slag to fly ash with the highest compressive strrnghts afte exposure to 100 oC was 9:1, while those for exposure to 200 oC, 400 oC and 600 oC was 7:3. It shows that the slag-fly ash alkali-activated material has good properties to resist the elevated temperatures. (6) The results of SEM photos indicated that, in ambient condition, the alkali-activated slag-fly ash paste had many undissolved particles of fly ash, which reduced its mechanical properties. However, the filling effect of fly ash particle and its characteristic of hollow spheres help increase the volume stability and thermal insulation properties of material.

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