波特蘭水泥作為建築業常用的材料之一，在2016年的全球產量就高達20億噸，波特蘭水泥的生產不僅釋放大量二氧化碳還消耗大量的能源，其二氧化碳排放量占全球人為二氧化碳排放的7%。為因應節能減碳的需求，水泥產業期望能開發低碳、低能耗的建材，因此以矽酸二鈣作為主要礦物相的貝利特水泥逐漸受到重視。與矽酸三鈣作為主要礦物相的波特蘭水泥相比，貝利特水泥具有較低的燒成溫度、較低的水化熱與較高的後期強度等優點。
本實驗使用水熱法將結晶二氧化矽、強化玻璃、容器玻璃與氧化鈣反應合成出纖維狀矽酸二鈣，利用廢棄物當作原料不僅可降低成本還可促進廢棄物的再利用，且纖維狀的晶體還能加強未來應用在水泥或是矽酸鈣板中的機械強度。利用強化玻璃與容器玻璃作為原料，需先經過球磨程序以降低粒徑，在球磨過程中，發現磨球與磨料的比例會影響破碎的效果。由於強化玻璃的硬度比容器玻璃硬，因此在研磨的過程中所需要的球料比較低。
在纖維狀矽酸二鈣的製備過程中，發現影響矽酸二鈣生成最重要的因素是材料本身的結晶性，當利用結晶二氧化矽合成時，樣品的矽酸二鈣占比可達到93%，但利用強化玻璃或是容器玻璃合成時，樣品的矽酸二鈣占比最高只到85%。利用高水固比來合成矽酸二鈣可使反應更趨向均相反應，在特定的情況下能使樣品更容易產生纖維狀晶體。另外，在實驗過程中發現不同的玻璃對於矽酸二鈣的合成也有影響，由於強化玻璃在製造過程中有經過熱處理強化，使其內部產生局部應力場，因此相較於容器玻璃能更有效的與氧化鈣反應形成纖維狀矽酸二鈣。

Portland cement (PC), one of the most widely used materials in the construction industry. The production of PC not only releases large amounts of carbon dioxide but also consumes significant amounts of energy, accounting for 7% of global carbon dioxide emissions. Belite cement (BC), which primarily contains dicalcium silicate as the main mineral phase, has gained more attention. BC offers several advantages, including a lower calcination temperature, lower heat of hydration, and higher long-term strength.
In this study, the fibrous dicalcium silicate was synthesized via hydrothermal method using silica, tempered glass and container glass. Using waste glass as raw material not only reduces production costs but also promotes waste recycling. If we want to use tempered glass and container glass as raw materials, a ball milling process was required to reduce the particle size. In ball milling process, it was observed that the ball-to-material ratio influenced the grinding efficiency. Because tempered glass is harder than container glass, tempered glass required a lower ball-to-material ratio to achieve the optimal grinding efficiency.
In the fibrous dicalcium silicate process, we observed that the crystallinity is the most important factor. When using silica, the phase proportion of dicalcium silicate is up to 93%. However, when using tempered glass and container glass, it is low to 85%. In addition, the type of glass also influences the synthesis of dicalcium silicate. Due to the thermal strengthening process used in the production of tempered glass, which induces stress fields. Thus, the stress field makes tempered glass more reactive with calcium oxide to facilitate the synthesis of dicalcium silicate.

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