由於受季節溫度變化、雨水沖蝕與車輛反覆加載等因素作用，近年鋪面維修與養護的需求與日俱增，已有許多學者研究將瀝青混凝土刨除料重新使用於再生瀝青混凝土之各種議題，但在多數國家中RAP的使用量仍受到限制而無法全數使用，根據我國目前法規中RAP之使用上限為40％，因應當局環保意識為求減少資源耗損及降低工程成本，本研究進行100%RAP之回收利用來製造再生瀝青混凝土，提高回收材料之應用，同時加入以往使用於水泥混凝土設計之DMDA(Densified Mixture Design Algorithm)緻密配比法觀念，透過找出最大單位重對應之添加比例α、β，以緻密堆積方式設計瀝青混合物，並和以往傳統密級配進行研究成果分析，期望能為台灣未來之鋪面工程提供不同再生瀝青混凝土之配比設計參考依據。本研究根據有效瀝青反應量及最佳試驗條件，針對傳統密級配設計100%RAP使用量，其中包含兩試驗組為無添加新鮮瀝青和添加0.5%改質Ⅲ型瀝青，與總瀝青含量為5%進行DMDA配比設計法之試體，分別為添加改質Ⅲ型瀝青和針入度20/40瀝青，透過力學試驗進行比較，並使用瀝青流變性質分析結果來交叉驗證。結果顯示，RAP粗粒料之回收瀝青具較大之G*/sinδ值，顯示其抗車轍變形能力更佳，而瀝青黏結料試驗雖顯示改質Ⅲ型瀝青較針入度20/40瀝青更具有高溫抗車轍與低溫開抗裂性能，但間接張力試驗結果表明，於瀝青混合物中添加針入度20/40瀝青更能具備此性能，添加改質Ⅲ型瀝青僅可明顯增加抗剝脫能力；而使用100%RAP進行傳統密級配設計結果與DMDA配比設計結合針入度20/40瀝青使用的結果趨近相同；最後，本研究試驗所得DMDA配比設計法應用於再生瀝青混凝土之最佳n值(新鮮瀝青使用係數)為0.36。

Many scholars have studied the issues about the use of reclaimed asphalt pavement (RAP) materials in recycled asphalt concrete, but in most of the countries, the available amount of RAP is still restricted and cannot be used in full. According to current regulations of Taiwan, the upper limit of RAP usage amount is 40%. On account of the environmental awareness of the Bureau, in order to reduce resource consumption and engineering costs, this study is devoted to researching the recycling method of manufacturing recycled asphalt concrete with 100% RAP to enhance the application of recycled materials. At the same time, adding the concept of Densified Mixture Design Algorithm (DMDA) method used in the design of cement concrete in the past, by finding the maximum unit weight corresponding to the addition proportion α, β, design the asphalt mixture in a densely packed manner, and analyze the results with the traditional dense gradation. It is expected to provide much diverse design reference of recycled asphalt concrete for future pavement projects in Taiwan. In this study, on the basis of the reaction volume of the active RAP binder and the best test conditions, the 100% RAP usage is designed for the traditional dense gradation, which includes two test groups for adding no fresh asphalt and adding 0.5% modified Type III asphalt, and compare with two groups which is used of DMDA design method, including the samples added with modified Type III asphalt and pen grade 20/40 asphalt for mechanical test, its total binder content is 5%, and the cross-validation was performed using the analysis results of asphalt rheological properties. The results show that the reclaimed asphalt binder of RAP coarse aggregate has a larger G*/sinδ value, which indicates that it has better resistance to rutting deformation. Besides, the asphalt test shows that the modified Type III asphalt has a higher temperature than the pen grade 20/40 asphalt, it represents better anti-rutting and low-temperature cracking resistance, but indirect tensile test results show that adding pen grade 20/40 asphalt to the asphalt mixture is more capable of this performance, adding modified Type Ⅲ asphalt can only significantly increase the resistance to stripping; however, the results of using 100% RAP for traditional dense gradation design and DMDA design method combined with pen grade 20/40 asphalt are approximate; finally, the best value of n (use factor of fresh asphalt) applied to recycled asphalt concrete which is obtained by the DMDA design test in this research is 0.36.

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