轉爐石(Basic Oxygen Furnace Slag，BOF)為煉鋼過程中的副產品，粒形為多角塊狀，比起一般天然粒料，比重大且洛杉磯磨損值低，又因其表面的粗糙度及氧化鈣成分，使BOF與瀝青緊密結合，較不易產生剝脫現象，BOF粒料的基本特性具有資源再利用價值，可視為綠色材料。轉爐石應用於瀝青混凝土已在國內縣市政府轄區內進行示多條示範道路的檢測，然而，高速公路現地轉爐石瀝青混凝土鋪面成效資訊缺乏，並且交通荷重與車速皆不同於市區道路。
本研究藉由國道1號與國道3號之鋪面績效量測、實驗室力學分析和交通量分析，評估轉爐石密級配與轉爐石開放級配瀝青混凝土鋪面之功能性、耐久性與安全性；功能性試驗包含透水量和噪音檢測，耐久性試驗包含車轍、平坦度和衝擊值，安全性試驗為英式擺錘值(BPN)，力學分析包含試體單位重、空隙率、回彈模數、間接張力及瀝青黏度，交通量則以單軸載重當量數(Equivalent Single Axle Load, ESAL)表示。
綜合各項初期鋪面績效評估及試驗室鑽心試驗數據呈現結果，轉爐石與天然粒料道路鋪面績效接近，惟目前仍屬於初期鋪面績效檢測，需持續進行現地檢測，收集完整長期鋪面績效，評估轉爐石應用於高速公路密級配和開放級配瀝青混凝土鋪面之可行性。

Basic Oxygen Furnace Slag (BOF) is the by-product in the process of steel making. The particle shape is polygonal, which has a larger specific gravity and lower Los Angles Abrasion Value compared to common natural granules; besides, the surface roughness and the contained calcium oxide make BOF tightly integrated with the asphalt, therefore it is not easy to flake off. For BOF can be recycled for use, it is regarded as green material. BOF has been widely applied in testing asphalt concrete of model roads in the administrative regions of Taiwan; however, the information about the effectives of BOF in asphalt concrete pavement on the spot of highways, and the traffic loading and vehicle speed is different to the urban roads.
The study adopts the Pavement Quality Measurement, Laboratory Mechanical Analysis and traffic volume analysis on National Highway 1 and 3 to evaluate the functionality, durability and safety of the BOF dense graded and BOF open graded asphalt concrete pavements; the functionality test contains permeable capacity and noise test; durability test covers track, plainness and impact value; safety test adopts British Pendulum Number (BPN), and the mechanical analysis includes the specimen unit weight, porosity, Resilient Modulus, indirect tension and asphalt viscosity; moreover, the traffic volume is expressed as equivalent single axle load (ESAL).
From the results of preliminary pavement quality evaluation and experimental data obtained in the laboratory, the pavement quality with BOF is quite similar to that with natural granules. However, it is still the preliminary pavement quality evaluation, which requires constant tests on the spot to collect the complete long-term pavement quality, so as to evaluate the feasibility of applying BOF in dense grade and open grade asphalt concrete highways.

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