Low temperature J-resistance curve determination of asphalt concrete using wavelet-Radon transform
来源期刊：中南大学学报(英文版)2013年第9期
论文作者：Ghafari Sepehr Moghadas Nejad Fereidoon Aflaki Esmail
文章页码：2563 - 2569
Key words：resistance curves; three point bending; radon transform; feature extraction
Abstract: A single specimen test using the three point single edge notched beam configuration at low temperatures for obtaining hot mix asphalt (HMA) resistance curves is developed. Resistance curves are obtained for mixtures at six temperature levels of +5, 0, -5, -10, -15, and -20 °C and three binder contents of 4%, 4.5%, and 5%. Crack extension increments during the test are measured by means of an image processing technique using Radon transform and feature extraction. All the specimens exhibit a rising R-curve, indicating ductility and toughening mechanisms in the ductile-quasi brittle fracture of the mixture. It is observed that the reduction of temperature results in a further tendency of the mixture for unstable crack growth and less subcritical crack length. It is also shown that using the binarization process, an automatic index can be developed that can represent the extent of brittleness and extent of the low temperature in which the cracking has occurred.
Ghafari Sepehr, Moghadas Nejad Fereidoon, Aflaki Esmail
(Department of Civil and Environmental Engineering, Amirkabir University of Technology, Tehran 15875, Iran)
Abstract:A single specimen test using the three point single edge notched beam configuration at low temperatures for obtaining hot mix asphalt (HMA) resistance curves is developed. Resistance curves are obtained for mixtures at six temperature levels of +5, 0, -5, -10, -15, and -20 °C and three binder contents of 4%, 4.5%, and 5%. Crack extension increments during the test are measured by means of an image processing technique using Radon transform and feature extraction. All the specimens exhibit a rising R-curve, indicating ductility and toughening mechanisms in the ductile-quasi brittle fracture of the mixture. It is observed that the reduction of temperature results in a further tendency of the mixture for unstable crack growth and less subcritical crack length. It is also shown that using the binarization process, an automatic index can be developed that can represent the extent of brittleness and extent of the low temperature in which the cracking has occurred.
Key words:resistance curves; three point bending; radon transform; feature extraction
