發(fā)布時(shí)間：2018-04-14 01:39

  本文選題：SBS改性瀝青 + 紫外線光老化��； 參考：《武漢工程大學(xué)》2014年碩士論文

【摘要】：SBS改性瀝青曝露在高溫和紫外輻射中會(huì)發(fā)生熱氧老化和紫外老化,均會(huì)導(dǎo)致SBS改性瀝青的路用性能和使用壽命下降。研究SBS改性瀝青的熱氧老化和紫外老化對(duì)于改善SBS改性瀝青路用性能十分重要,目前已有很多SBS改性瀝青熱氧老化和紫外老化的相關(guān)研究,這些研究大多是針對(duì)SBS改性瀝青整體體系進(jìn)行研究,但SBS改性瀝青各組分在熱氧老化和紫外老化過(guò)程中會(huì)相互影響,導(dǎo)致對(duì)SBS改性瀝青老化行為的深層認(rèn)識(shí)仍有限。本文建立了SBS的分離方法并研究了SBS改性瀝青的紫外老化過(guò)程,以SBS改性瀝青為原料,用薄膜烘箱老化試驗(yàn)方法模擬SBS改性瀝青混合料在儲(chǔ)運(yùn)、施工、拌合過(guò)程中發(fā)生的短期老化,再采用紫外輻射試驗(yàn)箱方法和自然光老化方法對(duì)SBS改性瀝青進(jìn)行室內(nèi)、外紫外老化試驗(yàn),對(duì)不同老化時(shí)間和老化方式的SBS改性瀝青進(jìn)行外觀觀察和熒光顯微觀察,最后將四個(gè)組分和SBS改性劑分離出來(lái),并且用紅外光譜分析各個(gè)組分隨老化時(shí)間延長(zhǎng)的結(jié)構(gòu)變化,本研究為更準(zhǔn)確地分析出SBS改性瀝青的熱氧老化和紫外老化機(jī)理打下基礎(chǔ),對(duì)評(píng)價(jià)與預(yù)測(cè)SBS改性瀝青的光氧化性能具有重要的意義。通過(guò)對(duì)以上內(nèi)容的分析研究,本論文主要得到以下結(jié)論:1.設(shè)計(jì)新的SBS分離方法并證明其可行,但該方法會(huì)造成SBS的少量損失和含有部分芳香分和膠質(zhì)。2.隨著老化時(shí)間延長(zhǎng)SBS改性瀝青表面顏色由黑色向灰色轉(zhuǎn)變,有明顯的硬化收縮現(xiàn)象且皺紋增多增大,熒光顯微鏡分析發(fā)現(xiàn)SBS顆粒在基質(zhì)瀝青中呈分散狀態(tài)。3.通過(guò)對(duì)不同老化時(shí)間的SBS改性瀝青進(jìn)行各組分測(cè)定,可得知紫外老化后SBS改性瀝青的總體變化趨勢(shì)為飽和分、芳香分、SBS含量降低,膠質(zhì)、瀝青質(zhì)含量和Ic值上升。4.通過(guò)傅立葉紅外光譜分析SBS改性瀝青各組分的組成,最明顯的變化是紫外老化后羰基和亞砜基含量增加,聚丁二烯的特征峰含量降低。
[Abstract]:The exposure of SBS modified asphalt to high temperature and ultraviolet radiation will lead to thermal oxygen aging and ultraviolet aging, which will lead to the decrease of pavement performance and service life of SBS modified asphalt.It is very important to study the thermal oxygen aging and ultraviolet aging of SBS modified asphalt for improving the performance of SBS modified asphalt. At present, there have been many researches on thermal oxygen aging and ultraviolet aging of SBS modified asphalt.Most of these studies are aimed at the whole system of SBS modified asphalt, but the components of SBS modified asphalt will affect each other in the process of thermal oxygen aging and ultraviolet aging, which leads to a limited understanding of the aging behavior of SBS modified asphalt.In this paper, the separation method of SBS was established and the ultraviolet aging process of SBS modified asphalt was studied. Using SBS modified asphalt as raw material, the aging test method of membrane oven was used to simulate the storage, transportation and construction of SBS modified asphalt mixture.The short term aging occurred in the mixing process, and then the ultraviolet radiation test chamber and natural light aging method were used to carry out the indoor and external ultraviolet aging tests of SBS modified asphalt.The appearance and fluorescence microscopy of SBS modified asphalt with different aging time and aging mode were observed. Finally, four components and SBS modifier were separated out, and the structural changes of each component with aging time were analyzed by infrared spectroscopy.This study lays a foundation for more accurate analysis of thermal oxygen aging and ultraviolet aging mechanism of SBS modified asphalt, and is of great significance to evaluate and predict the photooxidation performance of SBS modified asphalt.Through the above content analysis and research, this paper mainly obtains the following conclusion: 1.A new SBS separation method was designed and proved to be feasible, but this method can cause a small loss of SBS and contain some aromatic and colloidal.With the aging time prolonging, the surface color of SBS modified asphalt changed from black to gray, and there was obvious hardening and shrinkage phenomenon, and the wrinkle increased. Fluorescence microscope analysis showed that SBS particles were dispersed in the matrix asphalt.By measuring the components of SBS modified asphalt with different aging time, it can be seen that the total change trend of SBS modified asphalt after UV aging is saturation fraction, the content of aromatic component of SBS modified asphalt decreases, the content of resin, asphaltene and IC value increase by .4.The composition of SBS modified asphalt was analyzed by Fourier transform infrared spectroscopy. The most obvious change was that the contents of carbonyl and sulfoxide increased and the characteristic peak content of polybutadiene decreased after UV aging.
【學(xué)位授予單位】：武漢工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U414

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