本研究旨在開發具乾濕變色功能之鹼激發膠結材料，並評估其於環保建材及感測應用上的潛力。選用電弧爐還原碴與廢玻璃粉作為主要原料，分別摻入酚酞與百里酚酞兩種酸鹼指示劑，製備具有乾濕變色能力之鹼激發膠結材，探討其於不同鹼活化劑濃度與還原碴添加量條件下，各項材料性質之變化，並評估其色彩穩定性與耐久性，期望建立一套具乾濕感測功能之永續建材設計準則。本研究主要區分為三個階段，第一階段進行原料預先處理與其基本物理性質量測，第二階段比較不同配比設計條件下，所製成試體之硬固膠結材pH值、吸水率、色差以及抗壓強度之差異，進而篩選出最佳配比設計組合，第三階段則針對添加不同指示劑的膠結材試體，進行反覆變色試驗與力學性能量測及分析。結果顯示，添加酚酞之鹼激發膠結材試體在鹼活化劑濃度為9%及11%、還原碴取代率50%條件下，不僅在乾濕變化過程中具有穩定且明顯的變色效果，亦呈現良好的抗壓強度與濕乾循環耐久性。相較之下，添加百里酚酞所製成試體之顏色辨識性較差，且色彩回復性不具規則性，顯示其應用潛力相對有限。整體而言，於適當配比條件所製成之鹼激發膠結材中添加酸鹼指示劑，除可有效賦予其乾濕變色功能，亦不影響原有膠結材之強度，展現良好應用可行性，如此，將有助於提升電弧爐還原碴與廢玻璃粉等廢棄材料之再利用循環價值，提升其於永續建材領域之應用潛力。

This research aims to develop the alkali-activated binders with the characteristic of wet-dry color-changing and evaluate the validity for their applications in construction and sensing engineering. Electric arc furnace reducing-slag and waste glass were used as raw materials, combined with phenolphthalein and thymolphthalein as pH indicators to enable visual responsiveness to moisture. The effects of different alkaline activators and reducing-slag replacement ratios on the properties of alkali-activated binders were investigated, focusing on the stability, reversibility and durability of wet-dry color-changing. The raw materials were first pretreated and their physical and chemical properties were then characterized. Next, specimens with different mix designs were made and evaluated in terms of pH, water absorption, color difference, and compressive strength, leading to the determination of optimal mix-design. Last, repeated color-change tests and compressive strength measurements were conducted to evaluate the performance of alkali-activated binders containing different fractions of pH indicators under reversible wet-dry conditions. Results showed that specimens containing phenolphthalein, under the conditions of 9% or 11% alkaline concentration and 50% reducing-slag replacement, exhibited stable and visible color-changing, while also maintaining good compressive strength and durability. In contrast, specimens containing thymolphthalein demonstrated weaker color visibility and irregular recovery patterns, limiting their application. Alkali-activated binders containing pH indicators effectively imparted reversible wet-dry color-change functionality without compromising mechanical performance. This research not only enhances the utilization of industrial by-products of reducing-slag and waste glass but also encourages the development of intelligent and sustainable building materials.

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