還原碴與氧化碴皆為電弧爐煉鋼之副產品，還原碴化學組成與水泥熟料及水淬爐石粉相近，而氧化碴經過前處理後則在某些情況下能部分取代天然粒料使用，如果能將兩者結合製作成全爐碴混凝土取代水泥與天然粒料，不僅可處理這些工業副產物，同時減少水泥及天然粒料的使用，進一步達到多重效益。 試驗結果顯示，以70%爐石粉與30%還原碴混合，配合使用矽酸鈉及氫氧化鈉，作為混合膠結材料，製作之混凝土28天抗壓強度可達到設計強度140~210kgf/cm2，在抗壓強度方面可用以替代水泥作為混凝土膠結材料，且爐碴粒料可用於部分取代或者完全取代天然粒料製作鹼活化混合爐碴混凝土，在抗壓強度方面仍可維持於設計強度140~210kgf/cm2以上。耐久性方面，在固定水膠比之情況下，使用爐碴砂之鹼活化混合爐碴砂漿試體，對於乾縮量並無明顯不良影響，且爐碴粒料之使用於不會產生鹼質粒料反應。此外，運用陶瓷汙泥部分取代爐碴砂可有效改善鹼活化混合爐碴混凝土之新拌性質。 ;Reductive slag and oxide slag are the by-products of electric arc furnace (EAF) steel-making. Reductive slag shows a chemical composition similar to cement and blast furnace slag, and can be activated with alkaline as a binder for concrete. Also, after an appropriate processing, slag aggregates can be used in certain cases to replace part or all of the natural aggregates for making concrete. Laboratory test results show that mixed slag consisting of 70% blast furnace slag and 30% reductive slag, with the activation by sodium silicate and sodium hydroxide, can be used as binder for producing concrete with design 28-day compressive strength in the range of 140 - 210 kgf/cm2. Electric arc furnace slag aggregates can be used to replace part or 100% of the natural aggregate in the production of alkali-activated slag concrete. It was found that the concrete made with activated slag as binder and steel-making slag as aggregate did not show adverse effects on the drying shrinkage. Also, the concrete exhibited no potential for alkali-aggregate reaction. Finally, partial replacement of the fine aggregate with the ceramic milling sludge can effectively improve the slump of alkali-activated slag concrete.
