本文選題：無縫伸縮縫　切入點(diǎn)：高低溫性能　出處：《武漢理工大學(xué)》2014年碩士論文　論文類型：學(xué)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(shì)在歐美國家得到了廣泛的應(yīng)用。無縫伸縮縫必須同時(shí)承受伸縮變形和行車載荷作用，因而必須同時(shí)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(gè)難點(diǎn)。本文通過復(fù)合改性的方法制備出伸縮縫瀝青膠結(jié)料，并在規(guī)范指標(biāo)的基礎(chǔ)上對(duì)其性能進(jìn)行了深入的研究。 伸縮縫瀝青膠結(jié)料配方制定結(jié)果表明，輕質(zhì)油分可以較好的解決低標(biāo)號(hào)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(dú)使用都不能滿足伸縮縫膠結(jié)料的性能要求；利用SBS和橡膠粉配以輕質(zhì)油分同樣無法調(diào)和高低溫性能之間無法共存的矛盾；而在SBS/橡膠粉復(fù)合改性的基礎(chǔ)上引入抗車轍劑之后，得到的瀝青膠結(jié)料性能滿足規(guī)范要求。 對(duì)性能滿足要求的瀝青膠結(jié)料進(jìn)行流變性、穩(wěn)定性和耐久性的研究。結(jié)果表明，瀝青膠結(jié)料高溫下具有相對(duì)很高的模量，而低溫下的模量又相對(duì)很低，與進(jìn)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(yīng)力松弛能力良好。短期老化之后，常規(guī)性能指標(biāo)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(jí)下降16℃。熱儲(chǔ)存之后，上下部分軟化點(diǎn)差僅為1.8℃，流變性能基本一致。 同時(shí)對(duì)伸縮縫瀝青混合料進(jìn)行高低溫性能的研究。結(jié)果表明，瀝青混合料在60℃的動(dòng)穩(wěn)定度達(dá)到1167次/mm，滿足項(xiàng)目提出的1000次/mm要求的同時(shí)也達(dá)到了進(jìn)口材料的水平，且車轍深度要明顯小于進(jìn)口材料。在-10℃的溫度下，伸縮縫瀝青混合料最大彎拉應(yīng)變達(dá)到36734μm/m，遠(yuǎn)高于文獻(xiàn)提出的10000μm/m的標(biāo)準(zhǔn)，-20℃下的最大彎拉應(yīng)變則達(dá)到7987μm/m，和進(jìn)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(yīng)力松弛速度相當(dāng)快，t75（應(yīng)力松弛掉75%所花時(shí)間）分別為64s和61s，完全滿足15min的評(píng)價(jià)標(biāo)準(zhǔn)，殘留應(yīng)力都在0.1MPa的數(shù)量級(jí)。足尺模擬拉伸試驗(yàn)結(jié)果表明，拉伸過程中跨縫鋼板邊緣位置的變形量最大，對(duì)總體變形的貢獻(xiàn)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(hào)：1573158