多孔性瀝青混凝土(Porous Asphalt Concrete, PAC)由開放級配構成具有高比例孔隙的鋪面結構，藉由連通的孔隙，雨水可從鋪面結構中排出，避免在鋪面上形成水膜而發生行車打滑與水沫飛濺的現象，增加能見度，提高防滑性。然而，隨著鋪面的開放使用，PAC鋪面可能因擠壓變形或是受水侵害而造成坑洞，需要定期維護或是緊急修補。而冷拌之多孔性瀝青混凝土基本性質卻缺乏相關研究，無法比照冷拌密級配瀝青混凝土之規範，因此需要研擬冷拌多孔性瀝青混凝土作為維修材料之規範。
本研究首先探討國道6號現地試驗部分，建立PAC的長期績效。現地數據顯示，使用瀝青黏度較低的路段，孔隙較容易受到壓實，影響現地透水量、孔隙率及車轍量，而各路段的平坦度及抗滑能力仍維持在良好情況。再以2種最大標稱粒徑(Nominal Maximum Aggregate Size，NMAS)進行配比設計，以4種不同冷拌瀝青黏結料進行實驗。參考國內外冷拌瀝青混凝土試驗項目，建立冷拌多孔隙瀝青混凝土規範，並探討不同的養護時間和溫度對冷拌多孔性瀝青混凝土材料性質的影響。冷拌瀝青黏結料之揮發速率及黏度特性影響冷拌多孔性瀝青混凝土的各項工程性質，而在常溫下評估冷拌多孔性瀝青混凝土的工程性質，以表現冷拌多孔性瀝青混凝土的使用情形，較接近現地情況。試驗結果顯示，由於PAC的材料組成特性，常溫下的穩定值、間接張力值偏低，但是車轍試驗顯示高性能冷拌PAC與冷拌密級配瀝青混凝土相當，因此建議以車轍與簡易車轍試驗作為評估冷拌PAC的方法，也較符合現地狀況。規範建議項目為40℃試驗溫度穩定值試驗(110℃，養護24hr)，較能顯現冷拌PAC終期性質，高性能冷拌PAC穩定值研擬規範為600kgf，一般型冷拌PAC穩定值規範為350kgf；常溫下車轍實驗的動態穩定值規範設為3500(次/mm) ；簡易車轍試驗在泡水條件下較能模擬現地修補情形，能呈現冷拌材料受水份影響程度，建議動態穩定值規範在泡水條件下要高於300(次/mm)。

Porous Asphalt Concrete (PAC) constituted by the open gradation with a high proportion of pore structure. By the connecting pores, water can be discharged from the pavement to prevent hydroplaning, decrease splash and spray, increase visibility and improve skid resistance. However, after opening to traffic, PAC may be compressed and have potholes caused by water damage, need regular maintenance or emergency repair. Cold-mix PAC lacks of basic research, can not compare to cold-mix dense-graded asphalt concrete specifications, needs to establish cold-mix PAC specifications as a repair material.

The first part of this study is field tests on National Highway No. 6 to establish PAC long-term performance, shows the section using lower asphalt viscosity is more susceptible to compaction, affected on permeability, porosity and rutting. Each section remains good condition of IRI test and Skid-resistance capability. Using 2 different nominal maximum aggregate size (NMAS) for mixture design and four different cold-mix asphalt binder material for experiments, reference to domestic cold-mix asphalt concrete quality standards, establish cold-mix PAC specifications, study the different curing time and temperature on the material properties of cold-mix PAC. Material properties of cold-mix asphalt binder, including evaporation rate and viscosity characteristics, affect cold-mix PAC engineering properties. And tests at room temperature to evaluate the cold-mix PAC, is more closer to the in-site situation.

The results showed that, due to PAC material properties, the value of Marshall Stability and ITS at room temperature is much lower than Hot-Mix PAC. In wheel tracking test, high performance cold-mix PAC and cold-mix dense-graded asphalt concrete are approximately equal strength, thus, suggest wheel tracking test and simple wheel tracking test as evaluation tests of cold-mix PAC, also more simulate to the field. Recommended specification tests include 1)Marshall Stability test at 40 ℃(after curing at 110 ℃ 24hr), to show the final durability. 2)Wheel tracking test at room temperature. 3)Simple wheel tracking test, after immersed in water, be able to simulate the repair situation in rainy weather, shows the influence of water on cold-mix materials.

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