本研究探討以鹼激發爐石材料應用於3D列印中，選用添加不同比例回收橡膠與碳纖，對所製成材料之列印性、輕量化、乾縮行為、力學性能及方向性等影響。透過系統性之配比設計與試驗結果分析，比較不同比例爐石、橡膠及碳纖下3D列印材料之性能差異，進而評估其應用於非主要承重構件之可行性。

試驗結果顯示，隨回收橡膠取代骨材比例增加，所製成3D列印材料之密度，由市售約1.8 g/cm³降低至1.3~1.5 g/cm³，輕量化效果顯著。3D列印性方面，爐石與骨材比例為1:1時，所製成3D列印材料操作便利性、連續性及建構性表現最佳，添加碳纖有助於改善漿體建構性與列印連續性，但過高添加量反而降低操作便利性。另外，乾縮試驗結果顯示，不同試驗組之乾縮率介於0.9~1.5 %，高於市售3D列印材料之乾縮率。

力學性能方面，試體抗壓強度隨橡膠比例增加而降低，但添加碳纖可部分彌補強度損失，其中，各試驗組沿列印方向之抗壓強度普遍高於其他方向，顯示抗壓強度方向性主要源自3D列印製程，而抗彎強度與韌性則對碳纖添加比例非常敏感，同時韌性之非均向性更加明顯，此現象可能由於碳纖於列印過程中主要沿擠出方向排列所造成。

綜合上述3D列印材料性能，本研究選用爐石與骨材比例為1:1且碳纖佔骨材比例為10 %製成3D列印材料，同時，進行設計師椅3D列印之驗證實作。實體構件列印結果顯示，其成形品質良好且可承受成人反覆乘坐，重量較市售對照組減少約25.8 %，證實該配比所製成3D列印材料，於輕量化3D列印家具與非主要承重構件應用上具可行性。

This study explores alkali-activated slag (AAS) for 3D printing by incorporating recycled rubber (as aggregate replacement) and recycled carbon fibers at various dosages. Mixtures were systematically designed and tested to quantify printability, lightweight performance, drying shrinkage, mechanical properties, and anisotropy, and to assess suitability for non-primary load-bearing components.
Increasing rubber content reduced density from ~1.8 g/cm³ (commercial reference) to 1.3–1.5 g/cm³. The slag-to-aggregate ratio of 1:1 provided the best operability, printing continuity, and buildability. Carbon fibers improved buildability and continuity, though excessive fiber reduced operability. Drying shrinkage ranged from 0.9 % to 1.5 %, higher than the commercial reference.
Compressive strength decreased with higher rubber replacement, while carbon fibers partially mitigated the loss. Specimens tested along the printing direction generally exhibited higher compressive strength than other directions, indicating process-induced anisotropy. Flexural strength and toughness were highly sensitive to fiber dosage, and toughness anisotropy increased, likely due to fiber alignment along the extrusion path.
A mixture with slag : aggregate = 1:1 and 10 % carbon fiber (by aggregate fraction) was selected to 3D-print a designer chair. The printed component showed good dimensional quality, withstood repeated adult seating, and achieved a 25.8% weight reduction versus the commercial reference, demonstrating feasibility for lightweight 3D-printed furniture.

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