台灣天然砂石逐漸短缺，在環保的議題下，尋找適當的替代粒料及節能減碳是公共工程的重要課題。道路替代粒料可能包含轉爐石(Basic Oxygen Furnace Slag, BOF)及焚化爐底碴(Bottom Ash, BA)，上述材料稱為二次粒料(secondary aggregate)，二次粒料應用於瀝青混凝土中，不僅可以減少新鮮粒料(primary aggregate)的使用量，還可以節能減碳，符合環保及資源回收的精神。本研究分為二個部分，首先以轉爐石全取代天然粗粒料之多孔隙瀝青混凝土(Porous Asphalt Concrete, PAC)，根據日本排水性鋪裝技術指針所規定的配合設計方法，以高黏度瀝青，針對NMAS 12.5mm進行配合設計，製作馬歇爾試體進行實驗室工程性質評估以及績效評估，比較其耐久性、功能性及安全性。第二個部分則評估不同粗細粒料添加比例的焚化爐底碴混合天然粒料對道路底層的工程性質影響，並依照內政部營建署的級配粒料底層規範(第02726章)進行各項試驗，添加比例如下：天然粗粒料(55%)混合天然細粒料(45%)(對照組)、天然粗粒料(55%)混合底碴細粒料(45%)、底碴粗粒料(55%)混合天然細粒料(45%)、底碴粗粒料(55%)混合底碴細粒料(45%)。拌和後進行粒料物理試驗，並依照CNS 12382進行CBR試驗。
轉爐石取代天然粗粒料之PAC試驗結果顯示熱渣改質轉爐石PAC較其餘兩種PAC強度較強，有較佳的耐久性。功能性方面，三種PAC的滲透係數皆高於規範值，有良好的透水性。安全性方面，抗滑性能結果顯示PAC在安全性方面皆有一定水準。車轍輪跡試驗結果顯示轉爐石PAC有較佳的抗車轍能力。焚化爐底碴混合天然粒料之底層級配試驗結果顯示只有含有天然粗粒料的級配高於規範值，且底層級配的強度取決於粗粒料。

The shortage of natural aggregate (NA) in Taiwan is gradually getting serious. On the environmental issue, looking for secondary aggregate is the important topic in public construction. The secondary aggregate of pavement includes basic oxygen furnace slag (BOF) and Bottom Ash (BA). Secondary aggregate applying to asphalt concrete can not only reduction the usage of primary aggregate, but also energy saving and carbon reduction. The study is divided into two parts. First, BOF substitutes for natural coarse aggregate of porous asphalt concrete (PAC). Engineering properties of nominal maximum aggregate size (NMAS) 12.5 mm PAC with high viscosity asphalt were evaluated by means of conventional laboratory test to compare with durability, functionality and safety. Second part evaluates the engineering properties of base course by blending different percentage of BA and NA. Four different combinations are natural coarse aggregate blends natural fine aggregate, natural coarse aggregate blends BA fine aggregate, BA coarse aggregate blends natural fine aggregate and BA coarse aggregate blends BA fine aggregate.
The result of BOF PAC showed modified BOF PAC has better durability than traditional BOF and natural aggregate PAC. In functionality respect, the permeability coefficient of three PAC all has well functional. In safety respect, the result of British pendulum tester (BPN) showed PAC has good safety. In rutting resistance respect, the result showed BOF PAC can provide better rutting resistance. The base course result of BA aggregate blending natural aggregate showed only the combination with natural coarse aggregate can meet the specification values, and the strength of base course depends on coarse aggregate.

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