A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Study on the shear dilation behaviour of asphalt mixture
Recent studies indicate that dilatancy behaviour plays a key role in asphalt mixture rutting development. Therefore, it is important to understand the mechanism of dilation for better predicting and mitigating rutting development in asphalt pavements. In this study, a new radial displacement transducer was designed and used to capture circumference displacement change of specimen to calculate dilation. The test was conducted using Universal Test Machine 25 multifunctional material system and the radial displacement transducers to characterise the dilation phenomenon by measuring radial and volumetric changes of asphalt mixture specimens at temperatures of 30 °C, 40 °C, 50 °C, and 60 °C. The test results were analysed using the mesoscale method and Reynolds dilatancy theory, which study the coupling effects of dilation gradient, distortional strain, and volumetric strain of soil. Results show that the radial displacement transducer is capable of measuring radial changes of specimens. The dilatational behaviour of asphalt mixtures is strongly correlated to the softening point of asphalt, and is affected by loading time, aggregate properties, and testing temperature. It is found that dilation increases dramatically when the test temperature reaches the softening point of asphalt. In addition, the dilatational behaviour of asphalt mixtures is also affected by the anisotropy property of asphalt mixtures, looseness of interlocking of aggregate elements, and lubrication provided by asphalt.
Study on the shear dilation behaviour of asphalt mixture
Recent studies indicate that dilatancy behaviour plays a key role in asphalt mixture rutting development. Therefore, it is important to understand the mechanism of dilation for better predicting and mitigating rutting development in asphalt pavements. In this study, a new radial displacement transducer was designed and used to capture circumference displacement change of specimen to calculate dilation. The test was conducted using Universal Test Machine 25 multifunctional material system and the radial displacement transducers to characterise the dilation phenomenon by measuring radial and volumetric changes of asphalt mixture specimens at temperatures of 30 °C, 40 °C, 50 °C, and 60 °C. The test results were analysed using the mesoscale method and Reynolds dilatancy theory, which study the coupling effects of dilation gradient, distortional strain, and volumetric strain of soil. Results show that the radial displacement transducer is capable of measuring radial changes of specimens. The dilatational behaviour of asphalt mixtures is strongly correlated to the softening point of asphalt, and is affected by loading time, aggregate properties, and testing temperature. It is found that dilation increases dramatically when the test temperature reaches the softening point of asphalt. In addition, the dilatational behaviour of asphalt mixtures is also affected by the anisotropy property of asphalt mixtures, looseness of interlocking of aggregate elements, and lubrication provided by asphalt.
Study on the shear dilation behaviour of asphalt mixture
Zhang, Jiantong (author) / Yang, Jun (author) / Zuo, Na (author) / Lu, Qing (author) / Wang, Xiao (author) / Zhu, Haoran (author)
Road Materials and Pavement Design ; 16 ; 200-213
2015-01-02
14 pages
Article (Journal)
Electronic Resource
English
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