本研究係將煉鋼爐碴部份取代天然粗粒料拌製多孔隙瀝青混凝土，以探討煉鋼爐碴含量對多孔隙瀝青混凝土低噪音路面工程性質與吸音特性之影響。本研究分二階段進行，第一階段探討低噪音路面之配比方式，並建立含煉鋼爐碴低噪音路面配比設計法。第二階段進行力學性質試驗、鋪面績效試驗、耐久性質試驗及聲學特性試驗等，以評估煉鋼爐碴應用於低噪音路面之可行性。
研究結果顯示，在力學性質方面，馬歇爾穩定值、間接張力強度及直接剪力強度等皆隨煉鋼爐碴含量增加而提升。耐久性質及鋪面績效方面均能符合規範之要求。就聲學特性而言，吸音效果與較大孔隙率及較大粒徑級配有正向關係，較厚試體其吸音係數峰值之頻率較低；而孔隙性路面雙層化設計於上層及下層粒料粒徑相異且試體厚度維持不變時，吸音係數峯值頻率會隨上層材料孔隙率增加而逐漸往高頻位置移動，此外，若上層試體孔隙率達25%時，則吸音係數頻譜圖出現「雙峯值頻率」之次數會更加頻繁，而此種現象能減低重車引擎產生之低頻噪音及高頻率之氣泵噪音。就整體而言，煉鋼爐碴應用於低噪音路面具有可行性，不但能達到減低路面噪音之目的更能兼顧廢棄資源再利用之要求。

The purpose of this study is to investigate the sound absorption properties of porous asphalt mixture with various replacement proportions of crush furnace slag as coarse aggregate. The study is divided into two stages; Stage 1 develops the mix design method of porous asphalt mixture with furnace slag based on concept of particle packing. In stage 2, laboratory tests were preformed such as mechanical test, pavement performance test, durability test and acoustic property test to evaluate the feasibility of furnace slag application in low noise pavement.
From the test results, in mechanic properties, Marshall stability, indirect tension strength and direct shear strength are increased with increase of furnace slag replacement content. Durability and pavement performance meet the requirement of the standards. In acoustic property, sound absorption characteristic is positively related to larger porosity and larger aggregate grading. In general, the thicker specimen is, the frequency of sound absorption coefficient is tending to lower. In the double layer design when the aggregates size in the upper and lower levels are different and the specimen thickness is the same, sound absorption peak value moves to high frequency position with increase of air voids in upper layer. Moreover, the “two peak frequency phenomenon” has occurred while air voids of the upper layer reaches 25%. Such phenomonen may reduces the low frequcny noise and high frequency air pump noise from heavy vehicles, respectively. Based on laboratory investigations presented in this study, the application of furnance slag in low noise pavement is feasible. The furnace slag not only reduces the road traffic noise but also meets the requirement of recycling of waste resrouce.

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