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瀝青—集料界面剪切力學(xué)性能試驗(yàn)研究

發(fā)布時(shí)間:2019-06-05 11:25
【摘要】:由于具有強(qiáng)度高、噪音低、成型和維護(hù)簡(jiǎn)單,而且行車平穩(wěn)舒適等特點(diǎn),瀝青混凝土在道路工程中得到了特別廣泛地應(yīng)用。眾所周知,我國(guó)瀝青混凝土路面的早期破壞現(xiàn)象嚴(yán)重,剝落、松散、坑槽等病害層出不窮,很大程度上降低了瀝青混凝土路面的使用壽命和行車的舒適性。大量研究者普遍認(rèn)為,瀝青與集料界面間的粘聚作用和粘附作用是瀝青混凝土材料強(qiáng)度形成的關(guān)鍵因素,并且對(duì)瀝青混凝土的各種路用性能有著直接影響。實(shí)踐表明,瀝青與集料的界面是瀝青混凝土結(jié)構(gòu)的薄弱環(huán)節(jié),各種破壞形式往往都起源于界面的破壞,界面之間力學(xué)性能的優(yōu)劣成為決定瀝青混凝土材料性能的關(guān)鍵因素。因此,對(duì)瀝青與集料的界面力學(xué)行為進(jìn)行深入的試驗(yàn)研究,探索其破壞規(guī)律,對(duì)瀝青混凝土的設(shè)計(jì)、成型與養(yǎng)護(hù)都至關(guān)重要。本研究從瀝青混凝土的基本結(jié)構(gòu)著手,在分析現(xiàn)有的瀝青混合料剪切力學(xué)行為的成果和瀝青與集料界面的力學(xué)行為的成果的基礎(chǔ)上,對(duì)瀝青與集料表面的粘聚粘附特性和破壞機(jī)理進(jìn)行深入而系統(tǒng)地研究。為了研究瀝青與集料界面的剪切力學(xué)性能,采用自行設(shè)計(jì)的剪切夾具,配合萬能試驗(yàn)機(jī)與環(huán)境箱,對(duì)集料-瀝青-集料三明治試件進(jìn)行剪切試驗(yàn),得到每個(gè)試件在剪切荷載作用下的應(yīng)力-位移全曲線。對(duì)剪切破壞面進(jìn)行觀察分析發(fā)現(xiàn),該條件下的界面破壞模式為粘聚粘附混合破壞,而純粹的粘附破壞和粘聚破壞則很少發(fā)生。試驗(yàn)還發(fā)現(xiàn),在同樣試驗(yàn)條件下重復(fù)該試驗(yàn),瀝青-集料界面的剪切應(yīng)力-位移曲線呈現(xiàn)出不同的模式,可以明顯地區(qū)分為當(dāng)波峰曲線和雙波峰曲線。隨后改變?cè)囼?yàn)條件,分析不同試驗(yàn)條件對(duì)該剪切試驗(yàn)的影響。結(jié)果表明,集料表面粗糙度、成型壓載和試驗(yàn)荷載加載速率等因素對(duì)該試驗(yàn)都有顯著影響,并且這些試驗(yàn)因素對(duì)不同模式的應(yīng)力-位移曲線有不同的影響。波峰應(yīng)力與波谷應(yīng)力以及它們所對(duì)應(yīng)的位移和剪切剛度指數(shù)等參數(shù)被用來描述這些應(yīng)力-位移曲線。另外,分析發(fā)現(xiàn),雙波峰曲線的第二峰值與其出現(xiàn)位置呈現(xiàn)線性遞減關(guān)系。
[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

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