冷拌密級配瀝青混凝土（Cold-Mix Dense-Graded Asphalt Concrete, CM-DGAC）又稱為常溫密級配瀝青混凝土，用於鋪面坑洞緊急補修。冷拌瀝青混凝土做為修補材料，試驗方法無法反應冷拌瀝青混凝土之實際性質，致使試驗結果與現場績效無直接關係，因此需要以其他試驗方式評估並擬定適合國內環境與交通量的規範。
本研究首先探討4種不同冷拌密級配瀝青混凝土，分別採三種高性能與一種一般型冷拌瀝青混凝土，以密級配熱拌瀝青混凝土先進行配比設計，決定最佳瀝青含量，然後依照國內施工規範方法確定冷拌瀝青混凝土之基本工程性質，探討目前國內冷拌密級配瀝青混凝土的規範，再以日本Minegishi試驗方法進行相關力學與績效試驗，包含間接張力、車轍試驗、無圍壓縮試驗、簡易輪跡試驗和工作性試驗，分析冷拌密級配瀝青混凝土之工程性質。結果顯示冷拌瀝青黏結料的黏度與最大標稱粒徑顯著影響其工程性質，而高性能均較一般型為佳。比較各種養治方式與試驗項目後，本研究建議修改規範為：穩定值試驗(25℃，養治1天)，一般型為800 kgf以上，高性能為1000 kgf以上；工作性試驗(25℃，存放14天)，為200 N以下；車轍試驗為滾壓3000次，車轍深度20 mm以下；簡易輪跡試驗為滾壓600次，車轍深度7 mm以下。

Cold-mix dense-graded asphalt concrete (CM-DGAC) is routinely used to fill asphalt pavement potholes for emergency repair and maintenance. However, the laboratory results are generally not well related to field performance due to the fact that conventional test methods for hot-mix asphalt (HMA) can not reflect the nature of cold-mix asphalt concrete. Fundamental tests for evaluating the engineering properties of CM-DGAC should be developed.
This study investigates the engineering properties of the CM-DGAC with four different cutback asphalt binders and two gradations. Three types of cutback high viscous binders and one regular binder were included. The optimum asphalt content was determined based on HMA Marshal mix design method. In addition, The comparison of engineering properties in terms of the current specification in Taiwan and Mineghishi specification was discussed in this investigation. Mechanical tests including indirect tensile test, wheel tracking test, unconfined compression test, simplified wheel tracking test and workability examination test were undertaken on the CM-DGACs. The viscosities of the cutback asphalt binder were determined using Brookfield viscometer in order to correlate the engineering properties of CM-DGAC. The results showed a significant effect of viscosity of the cutback asphalt binder together with the nominal maximum aggregate size on the engineering properties of CM-DGAC. According to the results presented in this investigation, it is suggested that the Marshall stability should be greater than 1000 kgf for high performance type and 800 kgf for regular type CM-DGAC (25℃, 1 day), workability should be under 200 N (25℃, 14 storage days), rut depth should be less than 20mm after 3000 passes for wheel tracking test and less than 7 mm after 600 passes for simplified wheel tracking test.

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