本文選題：不同級配 + 橡膠瀝青　； 參考：《重慶交通大學》2015年碩士論文

【摘要】：近年來,隨著我國道路交通量的迅速增長,汽車車體的總質量及其軸載量也越來越大,而車輛荷載對路面的破壞也日趨嚴重。就當前出現(xiàn)的破壞狀況來看,大量新建的瀝青路面都以水損壞、車轍以及反射裂縫的破壞形式出現(xiàn),隨之出現(xiàn)的疲勞破壞也是瀝青路面主要破壞形式之一。而從世界范圍內的研究與實踐經驗來看,橡膠瀝青混合料路面具有良好的抗水損壞性、抗老化性、抗疲勞性、低溫柔韌性以及高溫穩(wěn)定性等優(yōu)點,在一定程度上能夠有效減緩路面早期損壞問題的出現(xiàn),并且橡膠瀝青混合料使用了大量的廢舊輪胎為橡膠瀝青的原料,從而很好的解決了廢舊輪胎回收利用問題。倘若對該環(huán)保材料進行合理的使用,將會對環(huán)境的保護及資源的節(jié)約起到極大的推動作用。因此,從道路原材料的性能著手來改善路面材料的抗疲勞性能,對橡膠瀝青混合料進行疲勞性能研究,進而對延長橡膠瀝青路面的使用壽命是具有重大意義的。首先,本文選取了目前最常用的三種級配即間斷級配SMA-13型和密級配AC-13型以及半開級配Type B-10型的橡膠瀝青混合料來作為研究對象分別對橡膠瀝青、集料、填料、添加劑等原材料的性能進行合格性試驗,并且采用目前最常用的小梁彎曲四點加載法對橡膠瀝青混合料疲勞性能加以研究。通過查閱國內相關配合比設計規(guī)范和試驗檢測分析,選用質量指標合格的各種原材料,再運用馬歇爾試驗確定三種級配的最佳油石比,最終確定三種級配的配合比,消除前期不利因素對研究橡膠瀝青混合料在抗疲勞性能方面的不利影響。其次,選定研究橡膠瀝青混合料疲勞性能的試驗方法和試驗參數(shù)后進行試件的制作、成型以及加載試驗,通過對這三種橡膠瀝青混合料試件進行兩種不同溫度(20℃和15℃)條件下的常應變控制的四點加載法小梁彎曲疲勞試驗,和對小梁彎曲疲勞試驗得到的有效數(shù)據(jù)進行分析整理,建立一元線性疲勞回歸方程來分析不同級配和不同試驗溫度等不同要素對橡膠瀝青混合料疲勞性能及壽命的影響。結果表明:橡膠瀝青混合料的疲勞性能與應變水平在雙對數(shù)坐標系中表現(xiàn)良好的線性關系;在相同溫度下間斷級配的橡膠瀝青混合料的疲勞性能明顯好于半開級配和連續(xù)級配橡膠瀝青混合料的疲勞性能;并且在常應變控制模式下,橡膠瀝青混合料的疲勞壽命隨溫度的升高而延長。最后,本文介紹了幾種研究瀝青混合料疲勞破壞機理的方法,分析了瀝青混合料疲勞損傷演化規(guī)律,并通過對幾種研究材料損傷機理論方法的分析比較,最后得出了一種較科學的研究方法。然而本文從疲勞損傷角度對橡膠瀝青混合料疲勞機理進行分析尚屬探索階段,還需要更深層次的研究。并且目前對橡膠瀝青疲勞性能所進行的各項研究的試驗條件都不全面,僅僅處于理論階段,要應用到實際工程中有待進一步的深入研究。
[Abstract]:In recent years, with the rapid growth of road traffic volume in China, the total mass of vehicle body and its axle load are becoming more and more large, and the damage to the road surface caused by vehicle load is becoming more and more serious. As far as the current failure situation is concerned, a large number of new asphalt pavements appear in the form of water damage, rutting and reflection cracks, and the fatigue damage that follows is one of the main failure forms of asphalt pavement. From the worldwide research and practical experience, the rubber asphalt mixture pavement has the advantages of good water damage resistance, aging resistance, fatigue resistance, low temperature flexibility and high temperature stability, etc. To a certain extent, it can effectively slow down the appearance of early damage, and rubber asphalt mixture used a large number of waste tyres as rubber asphalt raw materials, thus a good solution to the problem of recycling waste tires. If the environmental protection material is used reasonably, it will greatly promote the environmental protection and the conservation of resources. Therefore, it is of great significance to improve the fatigue resistance of pavement materials from the performance of road raw materials, to study the fatigue performance of rubber asphalt mixture, and to extend the service life of rubber asphalt pavement. First of all, three kinds of rubber asphalt mixture, discontinuous gradation SMA-13 type, dense gradation AC-13 type and semi-open gradation Type B-10 type, are selected as the research objects, respectively, for rubber asphalt, aggregate and filler. The properties of raw materials such as additives were tested and the fatigue properties of rubber asphalt mixtures were studied by trabecular bending four-point loading method. By referring to the design specifications of the relevant mix ratio in China and the test and analysis, selecting all kinds of raw materials with qualified quality indexes, and then using Marshall test to determine the best oil-stone ratio of the three grades, finally determining the mix ratio of the three grades. To eliminate the early adverse factors on the study of rubber asphalt mixture in the fatigue performance. Secondly, after choosing the test method and test parameters to study the fatigue performance of rubber asphalt mixture, the test pieces are made, formed and loaded. The three kinds of rubber asphalt mixture specimens were tested by four point loading method under constant strain control at 20 鈩，

本文編號：1855912