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Shakedown of asphalt pavements considering temperature effect
International Journal of Pavement Engineering ( IF 3.4 ) Pub Date : 2020-08-28
S. Liu, J. Wang, H. S. Yu, D. Wanatowski, N. Thom, J. Grenfell

Shakedown limit has been perceived as a useful guidance in pavement structure design against rutting. However, temperature, as one key factor influencing the shakedown limit of asphalt pavements, has barely been considered. In this paper, the shakedown phenomenon was first identified from wheel tracking tests for a pavement structure consisting of a dense bituminous macadam layer and a granular layer at 40°C. Based on a previously developed shakedown approach and the material elastic and plastic properties obtained through a series of tests, lower-bound shakedown limits of the layered system were determined and compared with the wheel tracking test results. Following that, an empirical relation between temperature and cohesion of asphalt mixture was suggested. A temperature-dependent shakedown approach was then proposed which can quickly obtain the shakedown limits of asphalt pavements over a range of temperatures. Results show that the shakedown limits decrease markedly with increasing temperature, accompanied by a shift of the failure mode from a granular layer failure to an asphaltic layer failure. One effective and economic way to enhance the pavement performance under high temperature is improving shear strength properties of asphalt mixtures. By using this method, pavement stability against rutting can be evaluated efficiently at any temperature.



中文翻译:

考虑温度影响的沥青路面整平

降低停车极限已被认为是防止车辙的路面结构设计的有用指导。但是,温度是影响沥青路面塌落极限的关键因素之一,几乎没有被考虑。在本文中,首先从车轮跟踪测试中确定了在40°C下由密集的沥青碎石层和颗粒层组成的路面结构的摇晃现象。基于先前开发的减震方法以及通过一系列测试获得的材料弹性和塑性,确定了分层系统的下限减震极限,并将其与车轮跟踪测试结果进行了比较。随后,提出了温度与沥青混合料内聚力之间的经验关系。然后提出了一种与温度有关的减振方法,该方法可以在一定温度范围内快速获得沥青路面的减振极限。结果表明,随着温度的升高,破碎极限显着降低,同时伴随着破坏模式从颗粒层破坏到沥青层破坏的转变。一种提高高温下路面性能的有效方法是提高沥青混合料的抗剪强度。通过使用该方法,可以在任何温度下有效地评估抗车辙的路面稳定性。伴随着失效模式从颗粒层失效到沥青层失效的转变。一种提高高温下路面性能的有效方法是提高沥青混合料的抗剪强度。通过使用该方法,可以在任何温度下有效地评估抗车辙的路面稳定性。伴随着失效模式从颗粒层失效到沥青层失效的转变。一种提高高温下路面性能的有效方法是提高沥青混合料的抗剪强度。通过使用该方法,可以在任何温度下有效地评估抗车辙的路面稳定性。

更新日期:2020-08-29
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