本文選題：無縫伸縮縫　切入點：高低溫性能　出處：《武漢理工大學》2014年碩士論文　論文類型：學位論文

【摘要】：瀝青填充式橋梁無縫伸縮縫是一種瀝青混合料填充式的伸縮縫，由于其特有的優(yōu)勢在歐美國家得到了廣泛的應用。無縫伸縮縫必須同時承受伸縮變形和行車載荷作用，因而必須同時具備優(yōu)異的高低溫性能。如何兼顧材料的低溫柔韌性和高溫抗變形能力是本文的一個難點。本文通過復合改性的方法制備出伸縮縫瀝青膠結料，并在規(guī)范指標的基礎上對其性能進行了深入的研究。 伸縮縫瀝青膠結料配方制定結果表明，輕質油分可以較好的解決低標號瀝青改性效果差以及低溫性能差的問題。SBS可以很大程度改善瀝青的高溫穩(wěn)定性，而橡膠粉則可以改善瀝青的低溫柔韌性和耐久性，但這兩種改性劑單獨使用都不能滿足伸縮縫膠結料的性能要求；利用SBS和橡膠粉配以輕質油分同樣無法調和高低溫性能之間無法共存的矛盾；而在SBS/橡膠粉復合改性的基礎上引入抗車轍劑之后，得到的瀝青膠結料性能滿足規(guī)范要求。 對性能滿足要求的瀝青膠結料進行流變性、穩(wěn)定性和耐久性的研究。結果表明，瀝青膠結料高溫下具有相對很高的模量，而低溫下的模量又相對很低，與進口材料處在同一水平，高低溫的相位角僅在25.9°到41.6°的范圍，溫度敏感性低，高溫抗變形能力和低溫應力松弛能力良好。短期老化之后，常規(guī)性能指標變化不大，模量略有降低，，相位角則略有升高，且高溫區(qū)的變化更為明顯，老化之后高溫等級下降16℃。熱儲存之后，上下部分軟化點差僅為1.8℃，流變性能基本一致。 同時對伸縮縫瀝青混合料進行高低溫性能的研究。結果表明，瀝青混合料在60℃的動穩(wěn)定度達到1167次/mm，滿足項目提出的1000次/mm要求的同時也達到了進口材料的水平，且車轍深度要明顯小于進口材料。在-10℃的溫度下，伸縮縫瀝青混合料最大彎拉應變達到36734μm/m，遠高于文獻提出的10000μm/m的標準，-20℃下的最大彎拉應變則達到7987μm/m，和進口材料處于同一水平。在-10℃和-20℃的溫度下，伸縮縫混合料的應力松弛速度相當快，t75（應力松弛掉75%所花時間）分別為64s和61s，完全滿足15min的評價標準，殘留應力都在0.1MPa的數量級。足尺模擬拉伸試驗結果表明，拉伸過程中跨縫鋼板邊緣位置的變形量最大，對總體變形的貢獻率最大，在該位置最容易出現(xiàn)開裂破壞。
[Abstract]:The seamless expansion joint of asphalt filled bridge is a kind of asphalt mixture filled expansion joint, which has been widely used in Europe and America because of its unique advantages. Therefore, it is necessary to have excellent high and low temperature properties at the same time. How to combine the low temperature flexibility and the high temperature deformation resistance of the materials is a difficult point in this paper. In this paper, the expansion joint asphalt binder is prepared by the method of compound modification. And on the basis of the specification of the performance of the in-depth study. The formulation of asphalt binder for expansion joint shows that light oil content can solve the problem of poor modification effect and low temperature performance of low grade asphalt. SBS can greatly improve the high temperature stability of asphalt. Rubber powder can improve the low temperature flexibility and durability of asphalt, but these two modifiers alone can not meet the performance requirements of expansion joint binder. Using SBS and rubber powder with light oil can not reconcile the contradiction between high and low temperature performance, but after introducing rutting resistant agent on the basis of compound modification of SBS/ rubber powder, the properties of asphalt binder can meet the requirements of specifications. The rheological properties, stability and durability of asphalt binders are studied. The results show that asphalt binders have relatively high modulus at high temperature and relatively low modulus at low temperature. At the same level as the imported materials, the phase angle of high and low temperature is only in the range of 25.9 擄to 41.6 擄, the temperature sensitivity is low, the deformation resistance at high temperature and the relaxation ability at low temperature are good. The modulus decreases slightly, the phase angle increases slightly, and the change of high temperature region is more obvious. After aging, the grade of high temperature decreases by 16 鈩

本文編號：1573158