近幾年來，因資源過度開採導致建築材料價格日益增加，加上國人逐漸重視資源回收觀念，已重視道路刨除之瀝青混凝土回收料的回收再利用。國內的瀝青拌合廠進行再生材料拌合時，幾乎都是利用氣旋式的加熱方式將回收料加熱，再經過輸送帶運送與新鮮料拌合，使成再生瀝青混凝土。然而，在輸送過程中，只能知道拌合鼓初端送入口的加熱溫度為多少，並不能實際掌握拌合鼓內的實際溫度。因此，回收料有可能受到高溫加熱，導致產生老化甚至碳化現象，進而影響再生瀝青混凝土之品質，然而目前並無相關研究探討過度預熱回收料對再生瀝青混凝土之影響。
本研究採用瀝青拌合廠回收瀝青混凝土作為研究材料，依據回收料不同老化條件主要以微觀差異性及工程性質來探討，第一部分為利用電子顯微鏡（SEM）就回收料不同加熱溫度及時間，分析回收料老化程度及再生瀝青混凝土瀝青薄膜包裹程度，找出其微觀結構之差異性；第二部分為求取其工程性質，如穩定值、間接張力強度和殘餘強度之數值，探討其過度預熱之回收料對再生瀝青混凝土之影響。
研究結果顯示，在微觀結構之差異性方面，回收料受到高溫長時間的老化影響，黏度也隨之增大、甚至無法取得瀝青膠漿，其瀝青薄膜厚度的確隨著老化條件嚴重的趨勢逐漸變薄，瀝青包裹程度亦逐漸不佳；在間接張力和殘餘強度試驗方面，過度預熱之回收料添加比例越高、老化條件越嚴重，則試體的能量損失率越高，相對的殘餘強度值也偏低，雖然在回彈模數試驗方面有高勁度的表現，這有可能只是短暫性的，但高勁度的表現容易產生疲勞裂縫。綜合分析，顯示過度預熱之回收料的確會造成再生瀝青混凝土的品質不佳，尤其抵抗水侵害的能力明顯降低許多。因此，建議再生瀝青混凝土避免採用過度預熱之回收料或者加熱太久之回收料，進而影響其工程性質。

In recent years, the reuse of reclaimed asphalt pavement (RAP) has become a critical issue with the rising of price of materials and concept of recycling. RAP was heated by pugmill with cyclone type and then mixed with virgin aggregate. In this process, the temperature of the pugmill is usually unknown causing that RAP may be over-preheated and further has bad effect on the pavement performance.
This study was conducted to ascertain the mechanical and microcosmic properties of asphalt mixtures with over-preheated RAP. This study includes two tasks: First, investigates the microcosmic properties of over-preheated RAP in terms of scanning electron microscope (SEM). Second, analyze how over-preheated RAP affects pavement performance.
The results showed that asphalt viscosity extracted by asphalt mixture increased and thin film coating aggregates decreased with increasing heating time and temperature. The data also indicated that energy loss rate (ELR) became higher when asphalt mixtures contain higher percentage of over-preheated RAP. Besides, asphalt mixtures with higher percentage of over-preheated RAP may stiffer than ones without over-preheated RAP, but the former may produces fatigue cracking easily.

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