本研究以蒸氣養生轉爐石為試驗材料，係透過一系列實驗室試驗，比較及驗證添加蒸氣養生轉爐石後之級配混合料，與天然級配材料特性和工程性質上的相似程度。為評估蒸氣養生轉爐石材料基本特性，並應用於道路基底層填方時的工程性質，針對蒸氣養生轉爐石混合天然級配粒料作為道路底層材料，隨著轉爐石受水化作用依百分比取代天然粒料所夯實之體積膨脹量，取得膨脹率是否符合規範值0.5%以內，試驗結果顯示各批轉爐石級配混合料在齡期第一天至第七天膨脹率，均符合CNS15311規範值。分析轉爐石與天然粒料之工程性質，將轉爐石進行基底層粗細粒料磨損率、健度、最大乾密度、液性限度、含砂當量等實驗，比重約為3.4有高於天然粒料約18%-33%之特性，而添加75%轉爐石混合級配料在土壤試驗上做夯打實驗時CBR值為169.5%，結構最為緊密扎實，應用至道路底層應能提供較高之承載力。本研究亦採用AASHTO道路設計法進行厚度敏感性分析，透過改變設計年限、可靠度、層係數、標準誤差等四項參數，其中交通量及路基模數皆為固定值，評估轉爐石底層用在道路結構之可行性，理論分析結果顯示採用轉爐石混合級配料可減少底層之設計厚度。

In this study, basic oxygen furnace (BOF) slag with steam curing was used as the test material. A series of laboratory tests were conducted to compare and verify the similarity of construction characteristics on the BOF slag and natural aggregate. In order to evaluate the expansion characteristics of the BOF slag, and the application of using BOF slag as roadbase materials, the BOF slag was mixed with natural aggregate with the percentages ranging from 0 to 100%. Test results show that the expansion rate of the BOF slag was lower than 0.5%. In addition, the BOF slags also met all requirements for the other physical properties. With regard to the engineering properties of the roadbase materials, the CBR value of adding 75% BOF slag to natural aggregate was 1.69 times higher than the 100% natural aggregate. The structure should be the densest, and provides higher bearing capacity as the roadbase. AASHTO pavement design method was also used to determine the thickness of the base layer of road and to analyze the sensitivity according to various design parameters. By changing the parameters of design life, reliability, layer coefficient and standard error, the thickness of base layer was changed. The results also indicated that the use of BOF slag in roadbase can significantly reduce the thickness of base layer.

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