台灣隨著經濟成長，交通量與日俱增，瀝青鋪面需要翻新與修復，同時也產生許多瀝青混凝土刨除料(RAP, Reclaimed Asphalt Pavement)，衍生許多環保與工程管理等議題，近幾年，政府對於環境問題越來越重視，朝著淨零排放目標邁進，在眾多的技術中，冷拌再生乳化瀝青混合料(Recycled Cold-Mix Emulsified Asphalt)在拌和的過程中不需要額外加熱，可以大幅降低二氧化碳對空氣與環境之污染及危害，亦不會有瀝青加熱老化的問題；另以刨除料取代新鮮粒料可降低其囤積空間，達到資源有效再利用的目標，係為一種經濟且環保的技術，因此積極發展冷拌再生乳化瀝青混凝土之技術研究具有重要的意義。然而，冷拌乳化瀝青混凝土之配比設計與拌合方法至今未有通用的標準程序，過去的文獻對於冷拌乳化瀝青混合物之設計法都有不同的建議，在試驗方法亦無一定的標準，另由於冷拌瀝青混凝土的抗張能力可能無法與熱拌瀝青混凝土相當，且目前國內尚未有冷拌再生乳化瀝青混凝土抗開裂性質等鋪面績效相關研究，因此本研究擬採用IDEAL-CT (Indirect Tensile Asphalt Cracking Test)評估冷拌再生乳化瀝青混凝土之抗開裂性質。本研究依據不同的標稱最大粒徑、殘餘乳化瀝青含量及RAP含量之IDEAL-CT試驗結果，評估上述三者變因對於冷拌再生乳化瀝青混合物抗裂之影響，並進一步分析間接張力強度(IDT)、工作能數值(Wf)及最大載重75%時之點斜率絕對值(m75)與抗開裂指數(CTindex)之間關係。試驗結果顯示，當冷拌再生乳化瀝青混凝土之殘餘瀝青含量越高，會提升混合物的抗疲勞開裂性能，然而，同時會降低混合物抗張強度的表現；對比熱拌瀝青混凝土(Hot-Mix Asphalt, HMA)，即便殘餘瀝青含量增加，抗開裂性能之表現仍較HMA差，係因為乳化瀝青於養護的過程，水份會蒸發而產生空隙，進而降低CTindex，透過各參數對於CTindex之綜合影響分析結果顯示，Wf與CTindex相關性較低，而m75與CTindex相關性則較高。

As the economic growth in Taiwan, heavy traffic together with high loadings has become a critical issue for road management, resulting in more frequent pavement rehabilitation than before. Due to the rehabilitation process, more RAP (Reclaimed Asphalt Pavement) are generated, leading to the environmental problems regarding energy consumption, carbon dioxide emission and landfill disposal. With many green paving technologies or materials, CMAE (Cold-Mix Asphalt Emulsion) is one of the solutions because it can be produced and laid at ambient temperatures without consuming too much fuel and energy. There also does not exist short-term ageing issue compared to conventional hot-mix asphalt. Additionally, it is also known that the addition of RAP with proper amount to asphalt concrete can reduce the process of virgin aggregate extraction. However, concern is raised with the fact that there is no universal procedure for the design of CMAE and the performance associated with cracking resistance for the CMAE is also not well understood. In this study, the IDEAL-CT (Indirect Tensile Asphalt Cracking Test) was conducted to assess the cracking resistance of CMAE with different NMAS(Nominal Maximum Aggregate Size), residual emulsified asphalt content and RAP content. Further analyses included establishment the correlations of indirect tensile strength (IDT), work energy (Wf), absolute value of the post-peak slope(m75) and cracking tolerance index (CTindex). Test results show that high residual asphalt content increases the cracking resistance of the CMAE, but a reduction in IDT is observed. The resistance to cracking of the CMAE is lower than that of the HMA due to the higher voids content of CMAE. The higher void content of CMAE is appeared because of water evaporation, thereby reducing the CTindex. It also can be concluded that the m75 has a significant effect on the CTindex of the CMAE.

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