台灣近年來工業發展迅速，鋼鐵的需求量日益增加，而煉鋼鐵副生的爐石，早期被視為鋼鐵的廢棄物，但在台灣地區粗細粒料日趨短絀的情形下，若能洞悉其特性而予以使用，不僅可以節省工程經費、節省能源同時增進社會經濟利益。 電弧爐爐碴是電弧爐在煉鋼的過程中所產生的固態副產品，但經由加工處理後，即可將爐碴予以資源化再利用，尤以台灣的河川砂石料日益枯竭的今天，以爐碴取代部份天然碎石級配鋪築道路基底層或是充當粗骨材拌製混凝土，應為一極有價值之應用方向。 本研究旨在探討電弧爐爐碴之氧化碴做為道路基底層粒料以及取代天然骨材拌製成混凝土之可行性。各階段試驗包括化性試驗、物性試驗以及環境試驗。拌製成混凝土後進行新拌性質以及硬固性質試驗與一般天然骨材混凝土進行比較。 試驗結果顯示，電弧爐爐碴不會對環境造成影響且大致符合道路用級配用及一般混凝土粗骨材之要求。而以適當級配之爐碴亦能取代粗骨材拌製成混凝土，且在強度發展方面比一般天然骨材混凝土佳，唯爐碴所具有之膨脹性使所製成混凝土之浸水膨脹率較高，因此有必要對爐碴之膨脹性加以抑制。 With the rapid progress in the industry in Taiwan, the demand for steels is increasing daily. The slags belonging to a by-product of steelmaking are considered as a waste of steels. However, the fine and coarse aggregates are less and less in Taiwan. So if we can know better the properties of slags and use them, we may save the cost of engineering and energy to increase the social economical benefits. Electric arc furnace slags are the solid by-products in the process of steelmaking. After dealing with them, they can be considered as a kind of resource. Especially in Taiwan, the aggregates are less and less so the natural aggregates can be partly replaced with slags for the civil engineering such as pavement or concrete. The study focuses on the possibilities that the oxidized dregs of the electric arc furnace slags substituted for natural aggregates for the civil engineering of concrete and the baselayer of pavements. The tests of the study include the chemical、physical and environmental ones. After mixing the concrete, the fresh and harden tests are performed and later we compare them with the ones of ordinary concrete. The results reveal that the electric arc furnace slags can’t influence the environment and can coincide mostly with the demands of ordinary concrete. With the proper gradation of slags, the fit concrete can be made . Even for the strength, it is better than the natural aggregate. Therefor, we can infer form the above the electric arc furnace slags can be substituted for natural coarse aggregates and won’t influence the quality of concrete.
