关键词: 道路工程, 摊铺质量, 数字图像技术, 沥青混合料, 均匀性

Abstract: Digital image processing technology has the advantages of high efficiency, real-time, quantification and low cost, which provides a new research direction for asphalt pavement quality detection and evaluation. In view of the difference between the size of the actual area and the number of aggregate particles corresponding to different acquisition heights, the self-made image acquisition equipment was used to collect 20 pieces of asphalt mixture digital images under the image acquisition height of 50~100 cm. Through the regression analysis of the collected images at different heights and the actual corresponding pavement width, the functional relationship between the acquisition height and the actual road size corresponding to the image was proposed. And through the study on increase of aggregate particles over 9.5 mm and size accuracy in asphalt mixture binary image after the digital image preprocessing, the best image acquisition height was proposed. The research results show that:with the increase of image acquisition height, the actual road width of the corresponding area of the image increases proportionally. Based on the results of the increase of aggregate particles and the recognition accuracy of aggregate particles under different acquisition heights, the optimal image acquisition height range is determined as 70~80 cm.

Key words: highway engineering, paving quality, digital image technology, asphalt mixture, uniformity