發(fā)布時(shí)間：2018-04-02 01:20

  本文選題：布敦巖瀝青　切入點(diǎn)：改性瀝青　出處：《湖南大學(xué)》2014年碩士論文

【摘要】：近年來(lái),產(chǎn)于印度尼西亞的布敦巖瀝青(Buton Rock Asphalt, BRA)作為瀝青改性劑,以其優(yōu)良的使用性能、簡(jiǎn)便的施工工藝和合理的價(jià)格備受道路工程業(yè)界的青睞,在國(guó)內(nèi)的應(yīng)用也逐漸增多。但是,我國(guó)目前對(duì)BRA改性瀝青及其混合料的材料設(shè)計(jì)、質(zhì)量檢測(cè)方法和技術(shù)指標(biāo)等尚未形成系統(tǒng)的技術(shù)規(guī)范,因此在一定程度上限制了布敦巖瀝青的推廣應(yīng)用。本文以50號(hào)A級(jí)石油瀝青作為基質(zhì)瀝青,BRA作為改性劑,制備摻量分別為5%、10%、15%、20%、25%、30%和40%的改性瀝青,應(yīng)用不同的方法研究了BRA對(duì)基質(zhì)瀝青的改性效果,確定了BRA適宜的摻量范圍以及性能評(píng)價(jià)指標(biāo)。 首先通過(guò)常規(guī)試驗(yàn),分析了基質(zhì)瀝青和BRA改性瀝青的針入度、針入度指數(shù)、軟化點(diǎn)、延度、老化后的質(zhì)量損失及針入度比等技術(shù)參數(shù)。試驗(yàn)結(jié)果表明,BRA的摻入可明顯地改善基質(zhì)瀝青的高溫穩(wěn)定性能、感溫性能及抗老化性能。但BRA中的礦物質(zhì)顆粒會(huì)對(duì)改性瀝青的延度造成不利影響,有必要參考BRA改性瀝青混合料的試驗(yàn)結(jié)果,對(duì)其改性效果進(jìn)行更為全面的評(píng)價(jià)。綜合考慮BRA對(duì)基質(zhì)瀝青各方面性能的改善情況,推薦BRA的適宜摻量范圍為15%～30%。 其次,對(duì)基質(zhì)瀝青和BRA改性瀝青進(jìn)行了Superpave試驗(yàn),并對(duì)常規(guī)試驗(yàn)指標(biāo)和Superpave試驗(yàn)指標(biāo)的相關(guān)性進(jìn)行了分析。試驗(yàn)結(jié)果表明,BRA的摻入可以明顯地改善基質(zhì)瀝青的高溫性能,降低溫度敏感性,增強(qiáng)高溫抗車轍能力,兩種評(píng)價(jià)方法得出的結(jié)論是一致的。另外,隨著B(niǎo)RA摻量的增加,改性瀝青的可使用溫度范圍較基質(zhì)瀝青有所擴(kuò)大,這說(shuō)明與基質(zhì)瀝青相比,BRA改性瀝青更適合在溫度變化比較大的地區(qū)使用。 基于動(dòng)態(tài)力學(xué)分析方法,探討了溫度和荷載作用頻率對(duì)BRA改性瀝青流變性的影響。并通過(guò)時(shí)-溫等效原理將荷載作用頻率從0.1rad/s～10rad/s拓寬到10-4rad/s～103rad/s,涵蓋工程應(yīng)用的全部頻率范圍,為全面研究BRA改性瀝青粘彈性行為提供充分的依據(jù)。 最后,綜合經(jīng)濟(jì)、社會(huì)效益分析顯示,BRA改性瀝青能夠改善路面的使用性能,提高路面服務(wù)水平,且符合節(jié)能環(huán)保的要求,具有良好的社會(huì)、經(jīng)濟(jì)效益,值得大面積推廣應(yīng)用。
[Abstract]:In recent years, Buton Rock Asphalt (BRA), produced in Indonesia, as a asphalt modifier, has been favored by the road engineering industry for its excellent performance, simple construction technology and reasonable price, and its application in China has gradually increased.However, at present, the material design, quality testing method and technical index of BRA modified asphalt and its mixture have not formed systematic technical specification, so the popularization and application of Budun rock asphalt is limited to a certain extent.In this paper, 50 grade A petroleum asphalt was used as the modifier of base asphalt, and the preparation amount of modified asphalt was 5101015202025% and 40% respectively. The modification effect of BRA on the base asphalt was studied by different methods.The suitable range of BRA content and the performance evaluation index were determined.Firstly, the penetration, penetration index, softening point, ductility, mass loss and penetration ratio of base asphalt and BRA modified asphalt were analyzed.The results show that the addition of BRA can obviously improve the high temperature stability, temperature sensitivity and aging resistance of the asphalt.However, the mineral particles in BRA will adversely affect the ductility of modified asphalt. It is necessary to evaluate the modification effect of modified asphalt mixture by referring to the test results of BRA modified asphalt mixture.Considering the improvement of the performance of BRA on various aspects of asphalt, it is recommended that the suitable dosage of BRA is 150.30%.Secondly, the Superpave test of base asphalt and BRA modified asphalt was carried out, and the correlation between conventional test index and Superpave test index was analyzed.The experimental results show that the incorporation of BRA can obviously improve the high temperature performance of the asphalt matrix, reduce the temperature sensitivity and enhance the rutting resistance at high temperature. The conclusion of the two evaluation methods is consistent.In addition, with the increase of BRA content, the usable temperature range of modified asphalt is larger than that of base asphalt, which indicates that the modified asphalt is more suitable for use in areas with greater temperature change than base asphalt.Based on dynamic mechanical analysis, the effects of temperature and loading frequency on rheological properties of BRA modified asphalt were investigated.The loading frequency is broadened from 0.1rad/s~10rad/s to 10 ~ (-4) rads / s ~ (10 ~ (-3) radr / s) by time-temperature equivalent principle, which covers the whole frequency range of engineering application, which provides a sufficient basis for the comprehensive study of viscoelastic behavior of BRA modified asphalt.Finally, the comprehensive economic and social analysis shows that the modified asphalt can improve the pavement performance, improve the pavement service level, meet the requirements of energy saving and environmental protection, have good social and economic benefits, and is worthy of extensive application.
【學(xué)位授予單位】：湖南大學(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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