本研究係以爐石為主體製成無機聚合物，改變液固比與鹼激發劑量來探討新拌與硬固漿體之基本工程性質，並利用X光繞射分析與掃描式電子顯微鏡觀察其微觀結構，最後再以田口分析法探討不同SiO2/Na2O、SiO2/Al2O3與Na2O/H2O成份比例對於其抗壓強度、動態彈性模數與熱傳導係數之影響，以做為未來配比設計之參考。
研究結果顯示：(1) 無機聚合物之工作性除了隨液固比增加而提高外，亦與鹼激發劑量有關。在液固比為0.5時，當鹼激發劑量由1%提高至3%時，流度值從95%增加至150%。(2) 以爐石基製成之無機聚合物其凝結時間易受到鹼激發劑量的影響。研究結果顯示，鹼激發劑量較高時，凝結時間大幅縮短。此外，增加鹼金屬矽酸鈉溶液的用量可利用其水分降低鹼激發劑之濃度，亦可達到緩凝之效果。(3) 在不同液固比下，使用低液固比可得到較高之動態彈性、動態剪力模數與超音波速，但所得到之熱傳導係數亦較高。另一方面，抗壓強度試驗結果顯示，液固比與鹼激發劑量兩者皆會影響聚合發展，參與聚合反應之成份過與不及皆無法達到最佳之工程性質。(4)無機聚合物之抗壓強度方面最高可達到166.32 MPa，但劈裂強度最高卻只有5.25 MPa，僅為抗壓強度之3.2%，這顯示出無機聚合物之抗張能力不足。(5) 由X光繞射分析之結果得知，以爐石基製成之無機聚合物多為非晶相之玻璃質結構。(6) 由田口法分析之結果得知，Na2O/H2O、SiO2/Na2O與SiO2/Al2O3為早期抗壓強度、動態彈性模數與熱傳導係數之顯著因子，其貢獻度分別為53.13%、82.61%與60.77%。然而，晚期之抗壓強度、動態彈性模數與熱傳導係數皆以SiO2/Na2O為顯著因子，亦即鹼激發劑量不足以激發爐石粉之活性，或是金屬矽酸鈉溶液不足以形成較佳之鍵結，長期工程性質便會降低。

This study explored the mechanical properties and microstructure of the slag-based geopolymer prepared with different liquid-solid ratios and amount of alkaline solutions. The influences of Na2O/H2O, SiO2/Na2O, and SiO2/Al2O3 on the mechanical properties of geopolymer were analyzed by the Taguchi method, whereas its microstructure was detected by X-ray diffraction and observed using scanning electron microscope.
The present study identified several major findings. First, the workability was increased by both the increases of the liquid-solid ratio and the amount of alkaline solution. With liquid-solid ratio of 0.5, the flow was increased from 95% to 150% as the addition of alkaline solution was increased from 1% to 3%. Second, the setting time was greatly influenced by the amount of the alkaline solution. The more addition of the alkaline solution was, the shorter the setting time was. On the other hand, retarded setting could be achieved by increasing the addition of sodium silicate solution because the alkaline solution could be diluted. Third, specimens with lower liquid-solid ratio had higher dynamic modulus of elasticity, dynamic modulus of rigidity, ultrasonic pulse velocity, and coefficients of thermal conductivity. However, the compressive strengths were controlled by both the liquid-solid ratio and the amount of the alkaline solution, suggesting that an optimum addition of the reactants in the geopolymerization was essential in order to make the ones with good mechanical properties. Fourth, the highest compressive strength was 166.32 MPa while the splitting tensile strength was 5.25 MPa, only 3.2% of the compressive strength, implying that the geopolymer did not have strong tensile strength. Fifth, the geopolymer was amorphous, as detected by X-ray diffraction. Finally, the Na2O/H2O, SiO2/Na2O, and SiO2/Al2O3 were significant factors of the early compressive strength, dynamic modulus of elasticity, and the coefficient of thermal conductivity, as analyzed using Taguchi method. The contributions of each factor were 53.13%, 82.61% and 60.77%, respectively. The SiO2/Na2O, however, was the only significant factor of the long-term compressive strength, dynamic modulus of elasticity, and coefficient of thermal conductivity, suggesting that the long-term mechanical properties could be reduced either by the insufficient alkaline solution that cannot activate the slag or the insufficient sodium silicate solution that cannot induce good bondings in geopolymer.

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