還原碴為電弧爐煉鋼過程中之副產物，由於其內部含有大量氧化鈣，當遇水將會產生體積膨脹之化學反應，同時，溶出鹼性氫氧根離子，因此，無法直接應用作為營建填充材，若將其隨意丟棄處理也可能造成環境破壞與生態汙染。為提供還原碴資源化再利用之途徑，本研究混合不同比例還原碴及廢容器玻璃粉，作為製造鹼激發膠結材之原料， 另外，分別添加適量酚酞及百里酚酞作為酸鹼指示劑，賦予所製成鹼激發還原碴膠結材之潮濕乾燥變色功能，進而提高其商業用途之經濟價值。針對不同原料及色料之設計配比，將其所製成膠結材試體進行乾濕色彩差異分析及抗壓強度、吸水率、反覆變色等試驗量測，以探討不同種類及添加量之酸鹼指示劑、鹼活化劑濃度、反覆乾濕變色次數等，對鹼激發還原碴膠結材試體色彩差異、感濕性及耐久性等材質影響。試驗結果顯示，當還原碴取代率固定為 50%時，添加 0.01%酚酞之鹼激發還原碴膠結材試體，選用鹼模數為 1.5 且鹼當量為 9%之鹼活化劑時，所製成試體之色彩差異值ΔE*ab 可高達 34.22，經 7 天空氣養護後，其抗壓強度約為16.34MPa，即使經過 10 次潮濕乾燥反覆變色作用後，其試體外觀仍保有色彩差異值 ΔE*ab 26.14 之高值。

Reducing slag containing a large amount of calcium oxide will undergo a chemical reaction of volume expansion and the dissolution of alkaline hydroxide ions when it is exposed to water. Hence, reducing slag cannot be used as a filling constituent in making construction materials. To evaluate the feasibility of recycling reducing-slag, reducing-slag and waste container glass were mixed in different proportions as the raw materials for making alkali-activated binders. Also, appropriate amounts of color-changing chemicals of phenolphthalein and thymolphthalein were added, giving the alkali-activated reducing-slag binders with the characteristic of colorchanging under dry and wet environment. By employing different proportions of alkaline solution and color-changing chemicals, the compressive strength, water absorption and color-changing mechanism of the alkali-activated reducing-slag binders were measured and then compared experimentally for dry and wet conditions. Based on the experimental results, the effects of type and content of color-changing chemicals, the concentration of alkaline activator and the repeated numbers of dry and wet conditions on the color difference, moisture sensitivity and durability of the alkali-activated reducing-slag binders are analyzed. It is found that the color difference value ΔE*ab of the binders can reach a maximum value of 34.33 when the replacement percentage of reducing slag and the addition fraction of phenolphthalein are fixed at 50% and 0.01% respectively and the alkaline activator with the silicate modulus of 1.5 and alkaline equivalent content of 9% is used. The compressive strength of the binders after 7 days of air curing is roughly 16.34MPa. The color difference value ΔE*ab is still 26.14 even after 10 repeated cycles of dry and wet conditions.

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