利用熱紅外影像技術於密級配瀝青混凝土鋪面之孔隙率與熱行為分析

Utilizing Infrared Thermography Technique for Analyzing the Thermal Behavior for Dense-Graded Asphalt Concrete Pavement with Different Air Void Contents

黃亞薇(Ya-Wei Huang)

指導教授 ： 韓仁毓

國立臺灣大學/工學院/土木工程學研究所/碩士(2021年)

https://doi.org/10.6342/NTU202102101

摘要

瀝青混凝土是普遍應用於柔性鋪面的施工材料，具有行駛舒適、可局部挖補修護、養護時間短等優點，然而也易受環境高溫與車輛輾壓等因素，造成路面破壞影響鋪面品質。過高的孔隙率會降低路面的使用壽命，當鋪面孔隙率小於3%時，抗車轍及抗剪力能力不佳，當孔隙率大於8%時，又容易受雨水侵害導致瀝青氧化。當材料具有孔隙時，會影響材料內部的熱能轉換，材料傳遞熱能的速率不一致時，表面溫度將產生部分高溫部分低溫現象。本研究利用紅外線熱影像儀不具破壞性，且能夠快速取得大量資訊之優點，透過熱影像儀觀測鋪面異常的溫度差異，進而發現路面內部缺陷，提升執行預防性養護之效能。為達到上述目標，本研究主要目的為建立鋪面孔隙率與溫度間的分析模式，研究方法可分成兩個部分，第一階段首先處理熱影像之幾何與光譜正確性，第二階段將模擬瀝青鋪面材料性質製作實驗試體，於實驗室中控制變因，探討不同孔隙率試體與溫度資訊之反應曲線。基於上述內容本研究發展出一系列方便有效的熱影像儀率定流程，並模擬出不同孔隙率試體，在吸收相同熱能的條件下，其升溫與降溫之累積溫度圖，透過本研究可清楚了解試體孔隙率與表面溫度間的相關性，有助於未來發展出一套非破壞性且快速的檢測方法，降低道路養護所需之時間成本。

關鍵字

紅外線熱影像 ； 瀝青混凝土鋪面 ； 孔隙率 ； 鋪面表面溫度 ； 鋪面密度

並列摘要

Asphalt concrete material is the most commonly used flexible pavement material on Taiwan’s highways. The advantages of flexible pavement include low cost, fast construction and comfortable when driving. However, it tends to be deteriorated by the high temperature and heavy pressure. Therefore, it is essential to detect the damages of the pavement in time to prevent the traffic accident from happening. However, it is difficult to achieve large-area monitoring with current technology. The air void content of the pavement is the main reason that affects the pavement’s durability. Excessive air void content causes the pavement non-waterproof and thus the rain will permeate through the pavement to lead to asphalt oxidation. The air void content is associated with the difference of the pavement’s surface temperature. This study aims to apply the infrared thermography technique to find out the defective pavement with abnormal surface temperature. Consequently, the main purpose of this study is to establish the relation between the air void content and the surface temperature. With the infrared thermography technique, not only can people detect the pavement defects by a non-destructive way, but a much effective and comprehensive approach can become available.

並列關鍵字

Infrared Thermography ； Asphalt concrete ； Density ； Air void content ； Surface temperature

參考文獻

Avdelidis, N. P., and Moropoulou, A., 2004. Applications of infrared thermography for the investigation of historic structures, Journal of Cultural Heritage, 5(1):119-127.

Bergman, T. L., Incropera, F. P., Lavine, A. S., and Dewitt, D. P., 2011. Introduction to heat transfer, John Wiley and Sons Publishers, Hoboken, NJ.

Brown, E. R., 1984. Experiences of Corps of Engineers in compaction of hot asphalt Mixtures, In Placement and Compaction of Asphalt Mixtures (F. Wagner, editor) , ASTM International, Philadelphia, pp.67-79.

Dynatest International, 2020. URL: https://www.dynatest.com/ (last date accessed: 15 June 2021).

Kandhal, P. S., and Koehler, W. C., 1984. Pennsylvania's experience in the compaction of asphalt pavements, In Placement and Compaction of Asphalt Mixtures (F. Wagner, editor) , ASTM International, Philadelphia, pp.93-106.