THE DEVELOPMENT OF JOB MIX DESIGN FOR COLD MIX EMULSIFIED ASPHALT CONCRETE

In recent years, the cold mix technique has been used to produce asphalt concrete from reclaimed asphalt pavement (RAP). This technique enables the effective use of large quantities of RAP and is less environmentally damaging than hot mix asphalt concrete. The strength of cold mix emulsified asphalt concrete is dependent on its job mix design, which must determine the amounts of water, cement, and emulsified asphalt that are added during concrete production. Therefore, the configuration of these three parameters directly affects the in-place performance of cold mix asphalt concrete. This study first explored the effects of various additive contents on the properties of cold mix asphalt concrete. The results revealed that an adequate level of total water content had a nonsignificant effect on concrete strength, whereas the levels of cement and emulsified asphalt content significantly affected concrete strength. In addition, the amount of cement to be added should be determined by the water-cement ratio with total water content. The results were used to develop a job mix design procedure for producing cold mix emulsified asphalt concrete. The procedure was verified to effectively determine the parameters required for concrete production and ensure adherence with the relevant regulations.

關鍵字

reclaimed asphalt pavement ； cold mix emulsified asphalt ； job mix design

並列摘要

近年來冷拌技術已被廣泛應用於再生瀝青混凝土，冷拌技術除了可有效再利用大量瀝青刨除料且相較於熱拌瀝青混凝土冷拌瀝青對環境之衝擊較小。瀝青混凝土之強度與成效取決於配比設計，冷拌瀝青混凝土於配比設計需決定添加水量、水泥量以及乳化瀝青添加量，因此如何於配比設計決定上述三個變數將直接影響冷拌瀝青混凝土於現地之成效表現。本研究首先探討各添加量對冷拌瀝青混凝土之影響，分析結果顯示在合適之總水量範圍內，總水量對於冷拌瀝青混凝土之強度無顯著影響，而水泥添加量與乳化瀝青添加量對冷拌瀝青混凝土強度有顯著影響，此外水泥添加量須採用水灰比與總水量一同考慮，基於上述結果本研究提出冷拌再生瀝青混凝土配比設計，結果顯示採用本研究所提之配比設計流程能有效決定冷拌瀝青混凝土所需決定之變數且能符合相關規範。

並列關鍵字

瀝青刨除料；冷拌乳化瀝青混凝土；配比設計

參考文獻

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