本研究主要利用前處理合成Ca/Si=1:1的C-S-H膠體，並藉由改變前處理溫度合成結晶程度不同的C-S-H膠體。此C-S-H膠體經過高溫蒸氣養護後合成硬矽鈣石，並探討不同前處理溫度的C-S-H膠體對於生成硬矽鈣石的結晶性質、微結構及生成動力學之影響。
前處理主要分為40℃、60℃和80℃三種溫度。實驗結果顯示，由XRD發現前處理溫度60℃時存在較強的非晶質矽酸鈣峰值；由NMR發現前處理溫度60℃時SiO2多為單體，前處理溫度80℃時SiO2則縮合成長的矽氧鏈；由微孔洞分析顯示，前處理60℃孔隙較少，表示含較多非晶矽酸鈣與較差的結晶性，而80℃孔隙最多，表示其擁有最佳之結晶性。
經壓濾成型後進行蒸氣養護，結果顯示有序的C-S-H膠體在180℃蒸氣養護過程中，會阻礙硬矽鈣石的生成，使得蒸氣養護24小時後硬矽鈣石生成量會有遲滯的現象，而在更高溫度200℃時硬矽鈣石會快速成長，C-S-H膠體結晶性的好壞對硬矽鈣石生成量之影響不大。因此，當前處理後的C-S-H膠體存在非晶質矽酸鈣，由於其溶解析出所須要之能量較低，因此造成生成硬矽鈣石的活化能較低；當前處理後的C-S-H膠體形成有序相，其溶解析出需要較大的能量，因此對於生成硬矽鈣石所需的活化能亦較高。

In this study, the effects of the pre-treatment temperatures (40, 60, and 80oC) on the crystallization, microstructure, and formation kinetics of xonotlite for C-S-H gels with Ca/Si=1 after steam curing at high temperature were investigated. The results showed that (1) a higher amount of amorphous calcium silicate was observed for the sample pre-treated at 60oC. (2) NMR results found that SiO44- remained as monomer for the sample with the pre-treatment temperature of 60oC and the SiO44- condensed to form silicate chains for the sample pre-treated at 80oC. (3) Based on the results of the micro-pore analysis, the sample pre-treated at 60oC had lower porosity, suggesting that it had more amorphous calcium silicate and poor crystallinity. However, the sample pre-treated at 80oC had the highest porosity, indicating that it had the best crystallinity. (4) The formation mechanism of xonotlite was via dissolution and precipitation. The dissolution of the ordered C-S-H gel after heat pre-treatment at 80oC needed higher activation energy to form xonotlite during steam curing process, which delayed the formation of xonotlite after steam curing for 24 h. However, at higher steam-curing temperatures (200oC), xonotlite formed rapidly independent of the crystallinity of C-S-H gels.

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