本研究係以氫氧化鈉溶液及矽酸鈉溶液為活性鹼性激發劑，並於固定之液固比下，藉由改變鹼激發量、水玻璃模數及爐石飛灰混合比，以探討各參數對於複合型爐灰鹼激發材料新拌及硬固性質之影響，其後再探討於不同氧化鈣與三氧化二鋁氧化物比率之材料性質，最後再以微觀試驗觀察鹼激發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之新拌流度值在125 mm 至260mm 之間；初凝與終凝時間分別為5~62 分鐘與31~120 分鐘範圍之間，增加鹼激發量會降低流度性能與縮短凝結時間。(2)鹼激發爐灰材料試驗組之28 天齡期抗壓強度在10.29~80.12MPa 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純爐石組，75%飛灰混合降低28 天抗壓強度13.9~43.1%之間。(3)全試驗組之鹼激發爐灰熱傳導係數範圍在0.963~1.60 W/m·K 之間，低於一般傳統混凝土之約50~73%，顯示材料具良好隔熱性能。(4)氧化鈣含量增加對複合爐灰鹼激發材料的抗壓強度與超音波速有正向的影響，其趨勢結果一致，但如考慮乾縮值會隨著氧化鈣含量增加而變大時，建議最佳值為配比S75F25 (CaO 含量為32.9 %，Al2O3 含量為16.6%)。(5)當三氧化二鋁含量越高，迴歸曲線有下降的趨勢，影響因素為鋁元素會與外在之硫酸鹽產生膨脹性反應物，雖能溶解出飛灰顆粒之矽及鋁元素於反應之中形成C-A-S-H 膠體，但鍵結程度較不完全，無法成為主要材料提升工程性質之來源。

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 material. Then investigate material properties of different CaO to Al2O3 oxides ratios. Finally, the variations of chemical compositions and microstructures of alkali-activated material were examined by the microstructural analyses.
The research results show that: (1) For the fresh properties, the flowabilities of alkali-activated slag-fiy ash mortar were in the range from 125 to 260 mm, the initial and finial setting times of paste were from 5 to 62 and 31 to 120 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 10.29 to 80.12 MPa. However, when the slag powder mixed with fly ash had lower strength with the amount of fly ash replacement by 75%, the compressive strength at 28 days were decreased by 13.9 to 43.1%. (3) The thermal conductivity of all mixture were in range from 0.963 to 1.60 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) Calcium oxide content increases have a positive effect on the pompressive strength of composite alkali-activated materials and Ultrasonic Pulae Velocity, a result consistent with its trend, but if considering the shrinkage values with increasing calcium oxide content becomes larger, recommendations on the optimum value ratio S75F25 (CaO content of 32.9%, Al2O3 content of (16.6%). (5) When the aluminum oxide content is higher, the regression curve downward trend,affect factors of aluminum sulfate and external elements will produce expansion reactants, although able to dissolve Si and Al elements of fly ash particles in the reaction among C-A-S-H colloidal form, but the degree of bonding than the incomplete, can not become the main source of the material nature of the Engineering Properties.

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