各項建築工程的完成，都必須開採大量的砂石，造成河川生態和周圍環境的影響。而道路工程所使用的瀝青混凝土具有可回收再利的特性，可減少河川砂石的開採和工程廢棄物的堆積，符合綠色環保。由國內外的研究指出回收料的添加可提升瀝青混凝土的工程性質，增加鋪面績效。
　　本研究採用老化程度較高的回收料作為再再生瀝青混凝土，使用AI之再生瀝青混凝土配合設計製作試體，以不同含量（0％、20％、40％、60％、80％）之回收料（RAP）和固定混合物黏度2000 poises評估添加不同種類的軟化劑和再生劑對再生瀝青混凝土各方面的影響，進行間接張力試驗、浸水剝脫試驗後的殘餘強度試驗、孔隙率試驗、Cantabro磨耗試驗和疲勞試驗，並探討各種再生瀝青混凝土於不同擴散天數之性質變化，最後針對回收料添加再生劑拌合鬆料以瀝青分層萃取回收作黏度和流變試驗，用以評估再生瀝青混凝土的擴散過程，使再生瀝青混凝土的評估更完善。
　　在混合料的孔隙率和比重試驗方面，可知回收料含量越高和添加劑的黏度越低，試體的孔隙率越低，而試體的比重則越高。在間接張力和殘餘強度試驗方面，回收料含量越高，試體的能量損失率越高，而其殘餘強度比值則越低，顯示回收料的添加使瀝青混凝土的抗水侵害能力較新料低。然而，回收料的添加可增加試體的強度，雖然水侵害損失的強度較新料高，但整體而言，再生瀝青混凝土的間接張力強度和泡水後的殘餘強度都較新料的高，顯示回收料可提升鋪面的間接張力和抗水侵害能力。而添加劑方面，以AC-10和RA-75的強度較高，而AC-5的添加明顯產生黑石頭情況，降低了再生瀝青混凝土的強度。其中以添加重油之黑石頭情況最為明顯，其拌合之試體強度幾乎為0，破壞時如砂一樣鬆散。
　　在鬆弛試驗方面，再生劑的鬆弛效果較軟化劑好，與新鮮料接近。在反覆載重試驗方面，就拌合黏度2000 poises而言，AC-20：RA-75（RAP40% 15天）：AC-10（RAP40%）：AC-5（RAP40%）的疲勞壽命比為100：90：57：32，顯示再生劑有效減少疲勞裂縫或破壞，使其疲勞壽命與新料接近，而軟化劑方面，以AC-10的疲勞性質較好。在癒合效應試驗方面，由於AC-5的黏度較低，使其試體的癒合效果較好，但其勁度損失率較新鮮料高。
　　在不同擴散天數（1、5、10、15、30、60天）方面，試體的間接張力強度、疲勞壽命、磨損率、不同瀝青層的黏度和DSR各項值都隨著擴散天數增加而改變。其中以再生劑的擴散效果最為明顯，於第10天強度明顯減少，而疲勞壽命則增加50%，到第15天的強度慢慢回復，而疲勞壽命沒有明顯繼續增加的趨勢，因此，評估再生瀝青混凝土的主要擴散天數為15天，於這段時間應避免鋪面受過大的載重影響。
　　綜合以上試驗結果，建議再生瀝青混凝土添加的軟化劑以AC-10為最佳，而AC-5與重油則不建議使用。而為了提高再生瀝青混凝土各方面的效果與新鮮料接近，應添加再生劑。

　　Asphalt concrete pavements can be recycled to reduce exploitation of river sandstone and waste of engineering, accordance with green environmental protection. Domestic and international research showed the use of recycled asphalt pavement (RAP) can improve the construction property of asphalt concrete and promote the performance of pavement.
　　In this study, the high level aged RAP was chosen to compacted the specimens about various content (0%, 20%, 40%, 60%, 80%) of RAP and the viscosity of mixture was controlled at 2000 poises in accordance with the mixture design was suggested by AI. The recycled asphalt concrete (RAC) mixed with recycling agents (RA) and softening agents (SA) was characterized in terms of IDT test, resistance to moisture induced damage test, air voids test, Cantabro test and fatigue test. And the results of these tests were compared to these of virgin mixtures. Finally, the compacted and loose specimens were curing at various days to examine the diffusion effect. The mastic of mixture, which was obtained by means of staged extraction, was used to determine the diffusion process that how much recycling agents was diffused into aged asphalt coating RAP aggregates.
　　The strength test results presented that use of RAP could reinforce the indirect tension strength and retained strength of the mixtures. And the strength of mixtures mixed with AC-10 or RA-75 were higher than other additive agents. The fatigue test results presented that use of recycling agents could reduce fatigue crack and improve the fatigue life of RAC. The diffusion test results presented that the main diffusion process occurred during 15 days and it is necessary to prevent the pavement from heavy load in this period.

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