| 摘要: | 再生瀝青混凝土鋪面經反覆的刨除再利用後，因回收料成分變異大，不僅加深材料品質變異性，也影響著鋪面耐久性及永續性。因此針對目前臺灣使用再生瀝青混凝土所遭遇到的問題，從現況分析、施工條件及成效評估這三個構面，對於刨除料以及再生瀝青混凝土性質進行提升其耐久之研究。 本研究收集臺灣位處的亞熱帶氣候條件、交通量等環境參數，依刨除料的基本特性及主管機關規定，對於再生瀝青混凝土使用現況進行分析。再從混合料拌合均勻性及現場施工壓實度兩個方面，從實驗室烘箱養治及現場實際鋪設，評估施工條件對於品質、成效及耐久性的影響。最後再針對亞熱帶高溫多雨的環境，以添加不同比例刨除料及再生劑之混合料，採用紫外線烘箱、壓力老化器及浸水殘餘強度等試驗，加速模擬瀝青材料在環境中受短期及長期老化的影響，評估鋪面耐久性。由研究結果對於目前再生瀝青混凝土問題，提出使用對策。 考量臺灣的氣候條件，對於重要道路或是交通量較大之路段，可以使用較高一等級之瀝青膠泥AC-30（3000Poises），以提升鋪面強度。由於目標黏滯度及回收瀝青黏滯度定義不同，應分別訂定相關標準，供各道路主管機關使用。對於黏滯度較高之刨除料，應限制其應用於範圍，作為路面的基底層或其他次要結構物之替代骨材，亦建議可以使用再生劑，訂定相關標準，可以增加刨除料用量及提升再生瀝青混凝土品質。再生瀝青混凝土於拌合完成後，置於暫存筒至少6?12小時、可以有效的增加混合均勻性，提高鋪面成效及施工時溫度分佈均勻性。雖然添加較多的刨除料可以提高其穩定值、回彈模數及間接張力值，卻降低其均勻性及浸水殘餘強度，應限制刨除料添加比例為40％以下，針對臺灣的環境條件，在拌合過程中加入一些防剝劑或石灰可減少剝脫問題發生。 藉由暫存筒的設置，可提高再生瀝青混凝土的均勻性，增加其成效，並提高其在服務年限時之耐久性。適當品質管理於刨除料添加量40％以下之再生瀝青混凝土可達到和一般瀝青混凝土相同的水準或是更佳之成效。再生瀝青混凝土的配合設計目標黏滯度可以訂在3,000Poises，回收瀝青黏滯度採用5,000±35％，各縣市狀況不同，可透過專家會議對黏滯度做適當的調整。由於再生瀝青混凝土加熱過程與一般瀝青混凝土之差異，有效的掌控溫度，可確保施工品質，增加鋪面耐久性。 Reclaimed asphalt pavement (RAP) after repeated re-use, the variance in component materials not only to affects the quality of variability, but also to influence the durability and sustainability. The objective of research is to enhance the durability of Reclaimed Asphalt Pavement quality for the problems from the analysis of current status, construction conditions and performance in Taiwan. The research is to analyze the Reclaimed Asphalt Pavement used status in Taiwan by the environmental factors of sub-tropical climatic conditions and traffic etc. , the characteristics of Reclaimed Asphalt Pavement and regulations of official authorities, assess the construction conditions effected of quality, performance and durability in laboratory and in-place by both aspects of if mix uniform and densification. And simulate asphalt material aged speed for short-term and long-term in natural environment by adding to different ratio of Reclaimed Asphalt Pavement and rejuvenator and the results form UV oven, Pressure Aging Vessel (PAV) and Tensile Strength Ratio (TSR) to assess durability of pavement for sub-tropical climate. Propose the solution for current problems of Reclaimed Asphalt Pavement form the research. For enhanced the strength of pavement for the road of heavy traffic with considering the climate can use higher level asphalt binder AC-30 (3000 Poises) in Taiwan. It should set different standard for official authorities used because of the definition of target viscosity is different form Reclaimed Asphalt viscosity. For higher viscosity RAP, It should restrict the application range for aggregate substitute pavement base and subbase or secondary structures, and suggest using rejuvenator with relevant standards to increase the amount of RAP and enhance quality. Placing in the insulation tube for 6 to 12 hours after RAP mixed could effective increasing its uniformity to enhance pavement performance and uniform temperature when construction. The ratio of adding RAP is less than 40% because of Adding more RAP could enhance stable value, resilient modulus of elasticity and indirect tension value but debasing its uniformity and Tensile Strength Ratio (TSR), adding Antistripping Agent or lime could reduce problems of scaling on environmental conditions in Taiwan. Enhance the uniformity, performance and durability of RAP by Insulation tube. Appropriate control the ratio of adding RAP is less than 40% could achieve the general pavement the same or better performance. The target viscosity can be set at 3,000 Poises by RAP design methods, reclaimed asphalt viscosity at 5,000 Poises ± 35%, the situation in different cities and counties may do so through the Expert Meeting on the viscosity appropriate adjustments. Due to RAP heating process differences with general pavement, that could ensure construction quality and increasing the durability by effective temperature control. |
