無機聚合物係由富含矽鋁酸鹽的膠結材料，經聚合反應所形成具有高早強度、抗蝕的膠結材，然而其耐久性質仍待進一步探討，其中碳化是評估耐久性質的重要參數之一，因此本研究嘗試探討碳化對爐石基無機聚合物漿體物化性質之影響。試驗過程中，以液固比0.6及氫氧化鈉與水玻璃體積比5:5製作爐石基無機聚合物漿體，試驗環境則以20%及100%濃度之二氧化碳進行加速碳化28天，並設定試驗環境相對溼度為75%及100%。結果發現，漿體之抗壓強度會隨環境中之二氧化碳濃度或相對溼度的提升而降低，其中以試驗環境100%濃度二氧化碳且相對溼度100%下之試體強度最低。在碳化深度量測試驗中，漿體於加速碳化後之碳化深度皆小於5 mm，顯示爐石基無機聚合物漿優秀之抗碳化能力。後續改變鹼性激發劑混合比例後發現，於鹼性激發劑混合比例5:5下具有28天最佳抗壓強度，但隨著鹼性激發劑中氫氧化鈉比例減少及水玻璃比例增加，乾縮量以及碳化收縮量皆會增加。另外，改變液固比時則會發現，隨著液固比從0.6減少為0.4，抗壓強度會增加，乾縮量以及碳化收縮量則會降低。後續透過XRD及氣體吸附分析，發現產生前述現象與碳化所導致的碳酸鈉/碳酸氫鈉生成及孔隙結構的改變有關。

Geopolymer is a cementitious material with high early strength and corrosion resistance by the polymerized aluminosilicates, but its durability is an issue. Carbonation is one of the important parameters to evaluate the durability. Therefore, this study tried to explore the effects of carbonation on the physical and chemical properties of slag-based geopolymer paste. During the study, the slag-based geopolymer was produced at water-solid ratio was 0.6 and 5:5 volume ratios of sodium hydroxide (NaOH) to water glass (WG). The test environments have 20% and 100% CO2 for the accelerated carbonation and the relative humidities at 75% and 100%. Results showed that the compressive strength of the paste decreased as the CO2 concentration or the relative humidity increased. The carbonization depth of the paste after the accelerated carbonation is less than 5 mm, indicating the excellent carbonation resistance of the slag-based geopolymer paste. After changing the mixing ratios of the alkaline activators in the subsequent experiments, it was found that the mix with the ratio of 5:5 had the highest 28-day strength. However, as the proportion of NaOH in the alkaline activator decreased and the proportion of WG increased, the amount of drying and carbonation shrinkage increased. In addition, it was found that as the liquid-solid ratio decreased from 0.6 to 0.4, the compressive strength increased, and the drying shrinkage and carbonation shrinkage decreased. Subsequent XRD and gas adsorption showed that the aforementioned behaviors were related to the formation of Na2CO3/NaHCO3 and the pore structure modified by carbonation.

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