Application of thermography technique on segregation of Asphalt concrete in laboratory

[[abstract]]瀝青混凝土發生析離將造成瀝青混凝土粒料與瀝青主要成分不均勻分佈在鋪面層上。析離將導致鋪面提早破壞，如裂縫、車轍、鬆脫及剝脫。這些破壞進而影響路面績效，服務品質與結構能力。儘管很多研究者致力於實驗室及現地探討，因此如何應用科學技術檢測析離，以提早在鋪面施工時改善析離問題，並提升鋪面施工品質一直是鋪面工程界重要議題之一。 本研究主要目的係應用紅外線熱影像技術檢測及判釋瀝青混凝土粒料析離。以實驗室製作模擬瀝青拌合料析離試體，應用紅外線熱影像儀拍攝，獲得試體表面輻射溫度分佈，經過資料處理找出溫度差及位置關係，再以一維小波轉換原理，找出析離試體頻率的特性。[[abstract]]Asphalt concrete mixture segregation in pavement occurs as a result of non-uniform distribution of the mixture of asphalt and aggregate components on the surface, resulting in earlier damage of the pavement layer, such as cracking, rutting, raveling, and stripping. The damage thus affects the road performance, service quality, and structural capacity. Despite researchers’ efforts in laboratory and site explorations, how science and technology can be applied in testing and segregation, in improving the segregation problem in advance during pavement construction, and in improving the pavement construction quality remain important issues in pavement engineering. The main purpose of this study is to apply the infrared thermal imaging technique to detect and judge the segregation of asphalt concrete aggregates. In the laboratory, simulated asphalt mix segregation specimens are produced. Using infrared thermal camera as a video recorder, the distribution of radiation temperatures on the specimen can be obtained. Then, through data processing, the relationship between the temperatures and locations were found. Finally, based on the one-dimensional wavelet transform theory, the characteristics of the segregation specimen frequencies were found