本研究旨在提升廢棄物之再利用價值，採用電弧爐還原碴及廢棄玻璃粉作為鹼激發膠結材之前驅物，並添加澎湖群島之砂砱作為骨材，探討此類材料工作性、抗壓強度及孔隙特性之變化趨勢，並評估其應用於3D列印材料之可行性。
本研究主要區分為三個階段，首先，透過調整電弧爐還原碴與廢棄玻璃粉之混合比例，以及鹼活化劑中之鹼當量，建立適當之鹼激發膠結材配比設計。接著，藉由調整骨膠比、細砂率及水膠比等參數，對所製成試體進行試驗，探討其材料性質之變化趨勢。最後，依據前述試驗結果，採用適宜之配比設計，進行3D列印測試及可行性評估。
研究結果顯示，鹼活化劑中之鹼模數"M" _"S" =1、鹼當量"AE" =10%、水膠比"W/B" =0.3，以及玻璃粉取代率20%條件下，所製成鹼激發膠結材具有最佳之7天抗壓強度28.12 MPa。添加砂砱骨材後，所製成試體流度下降且初凝時間縮短，經適當調整水膠比，其7天最佳抗壓強度可達30.79 MPa。根據各性質間之相關性分析結果，所製成試體之初凝時間及吸水率，皆與其抗壓強度呈現負相關趨勢，而烘乾前密度則與其抗壓強度呈現正相關趨勢，其中，高骨膠比條件下之相關性較為顯著。
3D列印測試結果顯示，提高骨膠比有助於改善列印材料之建構性，然而，維持鹼當量不變條件下，降低鹼模數時，將提高氫氧化鈉之比例，進而加速列印材料之反應速率，導致漿體於列印前即失去流動性。綜合3D列印之測試結果，以"M" _"S" =1、AE=10%、"W/B" =0.51、"A/B" =1.5及"S/A" =50%為實際列印之最佳配比設計，顯示含砂砱骨材之還原碴及玻璃粉鹼激發膠結材，具有應用於3D列印領域之潛力。

This study aims to enhance the recycling value of waste materials by utilizing Electric Arc Furnace Reducing Slag (EAFRS) and Waste Glass Powder (WGP) as precursors for alkali-activated binders, with Penghu coral sand as aggregate, to evaluate their workability, compressive strength, pore characteristics, and 3D printing feasibility.
The research comprised three phases: establishing the binder mix design by adjusting precursor proportions and activator parameters Ms and AE ; evaluating specimen properties by varying aggregate-to-binder A/B , fine coral sand-to-aggregate S/A , and water-to-binder W/B ratios; and assessing 3D printing performance using optimal mix proportions.
Results showed that the binder achieved a peak 7-day compressive strength of 28.12 MPa under Ms = 1.0, AE = 10%, W/B = 0.30, and 20% WGP replacement. Adding coral sand reduced flowability and accelerated initial setting, but adjusting the W/B ratio yielded a maximum 7-day strength of 30.79 MPa. Initial setting time and water absorption correlated negatively with strength, whereas dry density correlated positively.3D printing trials revealed that higher A/B ratios improved buildability, while lower Ms values at constant AE accelerated reaction rates, causing premature flowability loss. The optimal printing formulation Ms = 1.0, AE = 10%, W/B = 0.51, A/B = 1.5, S/A = 50% demonstrates strong potential for sustainable 3D concrete printing applications.

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