隨著臺灣廢棄物囤積量增加，如何有效去化為我國近年來工程之目標。電弧爐氧化碴(Electric arc furnace steel slag, EAF，本文簡稱氧化碴)為煉鋼所產生之副產物，臺灣每年約生產116萬噸之氧化碴，其去化問題顯得特別嚴重，近年來台灣將此材料運用於鋪面上。本研究將於實驗室評估氧化碴取代密級配瀝青混凝土細粒料之成效。第一階段，本研究將已破碎與磁選之氧化碴探討其粒料性質是否符合CNS 15310 等相關使用規範，是否可以取代密級配瀝青混凝土之細粒料。第二階段，設計出氧化碴取代量皆為30%之配合設計級配曲線，分別為設計上中下三種級配曲線，並與全天然粒料級配進行比較。第三階段，利用旋轉壓實機(Superpave Gyratory Compactor, SGC)模擬現場壓實方式製作試體，並進行成效試驗，希望能借由這些試驗獲得最適配比。經過試驗，本研究所使用氧化碴均符合級配粒料之規定，其毒物溶出、戴奧辛等環境試驗也低於國家使用之要求。配合設計結果顯示添加氧化碴會提高最適含油量，但氧化碴配比並無法有效吸收額外添加之瀝青，其瀝青吸收量與天然粒料配比相近。成效試驗中添加氧化碴有少許生銹跡象產生，偏下限之成效相對天然粒料及其他曲線差，但全部均符合規範要求。綜合本研究實驗室成果，氧化碴是可以應用於密級配瀝青混凝土，並建議級配曲線應偏上曲線及中曲線設計。另外氧化碴粒料隨著來源不同(電弧爐廠差異)，基本性質變異性極大，於應用上建議分廠分批使用避免錯估比重，造成成效不佳。;With the increasing amount of construction waste in Taiwan. How to effectively reuse it became the goal of the engineering field in recent years. Electric arc furnace steel slag (EAF) is a by-product of steelmaking. Taiwan produces about 1.16 million tons of EAF per year. It is a major issue to solve the stockpiling and space occupation problem. Taiwan had used EAF in pavement construction in recent years. This study will evaluate the effectiveness of EAF in replacing fine aggregate of asphalt concrete by laboratory evaluation. First, this study will investigate whether the granulated properties of the crushed and magnetically selected EAF meet the relevant specifications of CNS 15310 and other related specifications. Whether it can replace the fine granules of dense graded asphalt concrete. Second, a conventional aggregate substitute by 30% EAF has been used to design 3 kinds of grading curves. Third, Superpave Gyratory Compactor (SGC) was used to simulate the compaction situation in the field, and reverent performance tests are carried out in order to find the most reliable design. The EAF’s aggregate and toxic dissolution, dioxin and other environmental tests have to reach the requirement of the related specification. Mix design result shows by adding EAF it will increase the optimum asphalt content while EAF can’t effectively absorb the additional asphalt. It has the same absorption as conventional aggregate. Then slightly rust has been observed during the performance test. EAF-lower displayed the most unsatisfying performance results. In summary, EAF can be used in dense graded asphalt concrete. The gradation curve should be closed to the upper and middle grading curve. In addition, the EAF vary greatly depending on the source (differ from plants), and the basic properties are highly unstable. It is recommended to use the same EAF which is from the same plants in order to prevent poor performance.
