瀝青—集料界面剪切力學(xué)性能試驗(yàn)研究
[Abstract]:Asphalt concrete has been widely used in road engineering because of its high strength, low noise, simple molding and maintenance, and smooth and comfortable driving. As we all know, the early failure phenomenon of asphalt concrete pavement in our country is serious, spalling, loose, potholes and other diseases emerge in endlessly, which greatly reduces the service life and driving comfort of asphalt concrete pavement. A large number of researchers generally believe that the cohesion and adhesion between asphalt and aggregate interface are the key factors for the formation of asphalt concrete material strength, and have a direct impact on the various road properties of asphalt concrete. The practice shows that the interface between asphalt and aggregate is the weak link of asphalt concrete structure, and all kinds of failure forms often originate from the failure of interface, and the mechanical properties between interfaces become the key factors to determine the properties of asphalt concrete materials. Therefore, it is very important for the design, molding and maintenance of asphalt concrete to carry out in-depth experimental study on the interfacial mechanical behavior of asphalt and aggregate and to explore its failure law. Based on the analysis of the existing shear mechanical behavior of asphalt mixture and the mechanical behavior of the interface between asphalt and aggregate, this study starts with the basic structure of asphalt concrete, and on the basis of analyzing the existing shear mechanical behavior of asphalt mixture and the mechanical behavior of asphalt and aggregate interface, The adhesion characteristics and failure mechanism of asphalt to aggregate surface were studied deeply and systematically. In order to study the shear mechanical properties of the interface between asphalt and aggregate, the shear test of aggregate-asphalt-aggregate sandwich specimen was carried out by using a self-designed shear fixture, combined with a universal testing machine and an environmental box. The stress-displacement curve of each specimen under shear load is obtained. By observing and analyzing the shear failure surface, it is found that the interfacial failure mode under this condition is cohesion adhesion mixed failure, while pure adhesion failure and cohesion failure rarely occur. It is also found that when the test is repeated under the same test conditions, the shear stress-displacement curves of the asphalt-aggregate interface show different modes, which can be obviously divided into the wave peak curve and the double wave peak curve. Then the test conditions were changed and the effects of different test conditions on the shear test were analyzed. The results show that the aggregate surface roughness, molding ballast and test load loading rate have significant effects on the test, and these test factors have different effects on the stress-displacement curves of different modes. Wave peak stress and wave valley stress, as well as their corresponding displacement and shear stiffness indices, are used to describe these stress-displacement curves. In addition, it is found that the second peak value of the double-wave peak curve shows a linear decreasing relationship with its occurrence position.
【學(xué)位授予單位】:合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:U414
【參考文獻(xiàn)】
相關(guān)期刊論文 前10條
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