隨著全球淨零排放趨勢與我國《氣候變遷因應法》之推動，公共工程領域之低碳轉型逐漸成為重要政策方向。瀝青混凝土為道路工程中最主要之鋪面材料，其生產與施工過程涉及大量能源消耗與溫室氣體排放，因此如何透過再生材料利用與製程技術優化降低碳排放，已成為道路工程永續發展的重要課題。 本研究以再生瀝青混凝土(Recycled Asphalt Concrete， RAC)為研究對象，結合生命週期評估（Life Cycle Assessment， LCA）與層級分析法（Analytic Hierarchy Process， AHP），探討不同瀝青刨除料（Reclaimed Asphalt Pavement， RAP）添加比例及冷、熱拌製程技術之碳排放差異，並進一步分析其於公共工程減碳與自主減量制度下之應用潛力。研究內容以道路刨鋪工程為案例，計算活動數據，建立瀝青混凝土工程碳排放評估模式，並比較不同再生比例與製程條件下之碳排放表現。 研究結果顯示，隨 RAP 添加比例提升，瀝青混凝土之單位碳足跡呈現下降趨勢，其中以冷拌發泡再生瀝青混凝土之減碳效果最為明顯。在 10 公分鋪面厚度基準下，相較於傳統熱拌瀝青混凝土，冷拌再生技術可達成 47.95% 之單位面積碳排削減率，尤其於製造階段(A3)有效免除高耗能加熱程序，具有顯著減量潛力。 此外，本研究透過 AHP 分析公共工程採用再生瀝青混凝土之關鍵決策因素。專家問卷結果顯示，「工程技術與品質」（37.02%）為影響導入之最首要考量，其次為環境與社會效益及經濟政策誘因。綜合生命週期碳足跡與決策分析結果可知，在營建資源再生規範趨嚴及碳費機制推動下，高比例 RAP 與冷拌再生技術除具備材料循環利用效益外，更已成為最具成本效益之減碳路徑。未來可作為公共工程低碳採購、自主減量計畫及道路工程減碳策略之重要參考依據。;With the global net-zero trend and Taiwan′s Climate Change Response Act， low-carbon transformation in public works has become a crucial policy direction. As asphalt concrete production entails significant carbon emissions， optimizing manufacturing processes and increasing the use of recycled materials are key strategies for achieving sustainable road engineering. This study focuses on Recycled Asphalt Concrete (RAC)， integrating Life Cycle Assessment (LCA) and the Analytic Hierarchy Process (AHP) to evaluate carbon emission differences among varying Reclaimed Asphalt Pavement (RAP) ratios and cold-/hot-mix technologies. Using a road paving project as a case study， an emission assessment model was established to analyze the application potential of RAC under self-determined reduction systems. The results indicate that increasing RAP ratios effectively reduces the unit carbon footprint， with cold-mix foamed recycling demonstrating the greatest reduction potential. Under a 10 cm pavement benchmark， cold-mix technology achieves a 47.95% reduction in carbon emissions per unit area compared to traditional Hot-Mix Asphalt (HMA)， primarily due to the elimination of energy-intensive heating during the manufacturing stage (A3). Furthermore， the AHP analysis identifies "Engineering Technology and Quality" (37.02%) as the most influential factor in RAC adoption， followed by environmental and social benefits， as well as economic and policy incentives. Overall， under increasingly stringent recycling regulations and carbon fee mechanisms， the combination of high-RAP utilization and cold-mix technology not only enhances material circularity but also represents the most cost-effective decarbonization pathway， providing an important reference for low-carbon procurement and the development of self-determined reduction plans.
