本研究根據國道6號連續10年持續進行多孔隙瀝青混凝土 (Porous Asphalt Concrete, PAC )鋪面檢測調查，評估PAC鋪面之長期績效、生命週期經濟效益及環境影響，經由生命週期成本及碳排放量觀念的導入，於規劃設計階段考量道路鋪面長期性能表現，探討PAC鋪面妥適性及資源使用效率。PAC鋪面績效分為功能性，耐久性和安全性，功能性評估包含PAC鋪面之透水量和噪音變化，耐久性可由平坦度、車轍和衝擊值來說明，安全性則與鋪面抗滑度大小有關；經整理分析結果顯示，國道6號除了兩處路段於第10年進行刨鋪修復外，整體PAC鋪面續效迄今保持良好透水性和減噪等功能性要求；平坦度、車轍和鋪面結構等耐久性均在水準以上，抗滑度等行車安全性亦維持良好。PAC生命週期經濟效益考量PAC鋪面與密級配瀝青混凝土(Dense-Graded Asphalt Concrete, DGAC) 鋪面之使用年限分別估計為10年及5年，以40年為分析年限及折現率6.0%計算結果，PAC鋪面相較DGAC鋪面之生命週期各項效益指標均符合預估標準，並顯示PAC鋪面刨鋪頻率大於5年即具有經濟可行性。PAC環境影響評估採用道路工程生命週期方式，計算新工建造及營運維護各階段工作碳排放量，新工建造階段係指鋪面實際執行建造期間，營運維護階段則以鋪面設計年限為期程，對於材料生產、材料運輸及工地施工等三個部份計算二氧化碳排放量，結果顯示國道6號鋪面採用之PAC鋪面相較於採用DGAC鋪面之每年減碳量為921411 KG-CO2，相當3.5座大安森林公園每年CO2吸收量，環境指標具有明顯減碳效益。

The study is based on the Porous Asphalt Concrete (PAC) pavement survey of National Highway No 6 for ten years constantly. It evaluates the long-term evaluation, life cycle economic benefits and environmental impact of PAC pavements. Through the application of life cycle cost and carbon dioxide (CO2) emissions concepts, the study considers the long-term evaluation of road pavements during the design and planning phase. Also the study explores the the appropriateness of PAC pavement and resource-use efficiency.
The Porous Asphalt Concrete (PAC) performance evaluation is divided in to functionality, durability and safety. The functional assessment includes the permeability and noise variation of the PAC pavement. The durability can be explained by the flatness, wheel-tracking and impact resistance values. The safety is related to the skid resistance measurement of the pavement. According to the results of the analysis, except for the two sections of National Highway No 6 has been repaired in the 10th year, the overall PAC pavement has been maintained well till now: good water permeability and noise reduction. Moreover, the durability of flatness, wheel-tracking and pavement structure are above the standard level. The anti-sliding part on driving safety is also maintained quite well.
PAC life-cycle economic benefits are estimated to be 10 years and 5 years for the use of PAC paving and Dense-Graded Asphalt Concrete (DGAC) pavement. When taking 40 years as the analysis period and a discount rate of 6.0% as the calculation result, and comparing to DGAC pavement, the life cycle efficiency gains of PAC pavement corresponds to the estimated standard, and it shows that the PAC paving frequency is economically feasible just for or after 5 years.
The PAC environmental impact evaluation adopts the road engineering life-cycle method to calculate the carbon emissions of the new construction and operation and every maintenance phases. The new construction phase refers to the actual construction period of the pavement. The operation and maintenance phase is based on the design period of the pavement. The carbon dioxide emissions are calculated in three parts: material production, transportation and construction site. The results show that every year the carbon reduction of PAC pavement used in National Highway No. 6 pavement is 921,411 KG-CO2 compared to the DGAC pavement , which is equivalent to the annual CO2 absorption of 3.5 Daan Forest Park. The result shows that the PAC pavement has significant carbon reduction benefits compared to the DGAC pavement.

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