【摘要】：本文在了解國內(nèi)外改性瀝青發(fā)展以及碳納米管性質(zhì)的基礎(chǔ)上,首次嘗試用碳納米管作為單純改性劑來改性基質(zhì)瀝青,研究碳納米管改性瀝青的常規(guī)瀝青性能的改善以及路用性能的改善,并對(duì)碳納米管改性瀝青作為微觀結(jié)構(gòu)分析,探索改性瀝青的新發(fā)展,為納米級(jí)碳材料改性瀝青的研究與應(yīng)用奠定了一定的基礎(chǔ)。文章以研究碳納米管對(duì)基質(zhì)瀝青的溫度敏感性的改善為主要目的,研究了瀝青常規(guī)性能,包括瀝青三大指標(biāo)性能、粘度指標(biāo)性能以及流變性能,其中針入度、粘度和流變性試驗(yàn)采用較高溫度,研究碳納米管改性瀝青的高溫性能改善,延度采用低溫,用以研究碳納米管改性瀝青的低溫性能。根據(jù)改性瀝青的相關(guān)文獻(xiàn)制定了合適的配合比,從而研究碳納米管改性瀝青混合料路用性能的改善;通過對(duì)碳納米管本身性能的了解,對(duì)碳納米管改性瀝青進(jìn)行了熒光顯微鏡觀察和差式掃描熱量分析DSC的微觀試驗(yàn)。宏觀的試驗(yàn)主要以碳納米管摻量的變化為主,研究不同摻量下碳納米管改性瀝青性能的變化,溫度敏感性分別從高溫和低溫兩個(gè)反面就行試驗(yàn)設(shè)計(jì)。微觀試驗(yàn)主要探索碳納米管與基質(zhì)瀝青的共混方式,以及通過研究基質(zhì)瀝青在潤濕碳納米管過程中熱量的變化來分析共混機(jī)理。試驗(yàn)中的難點(diǎn)主要集中在碳納米管在基質(zhì)瀝青中的分散方面,由于碳納米管具有高團(tuán)聚性,較難在基質(zhì)瀝青中自由均勻的分散,本文嘗試用剪切乳化儀在高溫下長時(shí)間的剪切以達(dá)到碳納米管分散的最佳效果。熒光顯微鏡微觀觀察改性瀝青中,由于瀝青不易切片,因此樣品的制備也是難點(diǎn),查閱了相關(guān)文獻(xiàn)得知需采用熔融壓片法。通過熒光顯微鏡微觀分析得知物理機(jī)械的分散起到了一定的效果。DSR的分析得知碳納米管與基質(zhì)瀝青的融合產(chǎn)生了熱量的變化,雖然變化較小但表明了碳納米管提高了改性瀝青的熱穩(wěn)定性,而且碳納米管與基質(zhì)瀝青通過試驗(yàn)方法的改變達(dá)到了一定的相容。試驗(yàn)結(jié)果達(dá)到了預(yù)期的目的,碳納米管降低了基質(zhì)瀝青的溫度敏感性,提高了改性瀝青的高溫穩(wěn)定性和低溫抗裂性。碳納米管改性瀝青混合料的實(shí)驗(yàn)結(jié)果表明改性瀝青在實(shí)際應(yīng)用中有較好的前景。
[Abstract]:On the basis of understanding the development of modified asphalt at home and abroad and the properties of carbon nanotubes, this paper first tries to use carbon nanotubes as a pure modifier to modify the matrix asphalt. This paper studies the improvement of conventional asphalt performance and road performance of carbon nanotube modified asphalt, analyzes the microstructure of carbon nanotube modified asphalt, and explores the new development of modified asphalt. It lays a foundation for the research and application of carbon modified asphalt. In order to improve the temperature sensitivity of carbon nanotubes (CNTs) to base asphalt, the conventional properties of bitumen are studied, including three indexes of asphalt, viscosity and rheological properties, including penetration. The viscosity and rheological properties of carbon nanotube modified asphalt were studied by using high temperature. The ductility of carbon nanotube modified asphalt was studied by using low temperature to study the low temperature performance of carbon nanotube modified asphalt. According to the related literature of modified asphalt, the appropriate mix ratio is worked out to study the improvement of pavement performance of CNT modified asphalt mixture, and through the understanding of the performance of CNT itself, Carbon nanotube modified asphalt was studied by fluorescence microscope and differential scanning calorimetry (DSC). The macroscopical test mainly focused on the change of carbon nanotube (CNT) content. The temperature sensitivity was designed from the two opposite sides of high temperature and low temperature, respectively. The microcosmic test mainly explores the blending mode of carbon nanotubes (CNTs) and matrix asphalt, and analyzes the blending mechanism by studying the heat change of matrix asphalt in the process of wetting carbon nanotubes (CNTs). The difficulties in the test are mainly focused on the dispersion of carbon nanotubes in the matrix asphalt. Due to the high agglomeration of carbon nanotubes, it is difficult to disperse freely and uniformly in the matrix asphalt. This paper attempts to achieve the best effect of carbon nanotube dispersion by using the shear emulsifier for a long time at high temperature. Because the bitumen is not easy to be sliced by fluorescence microscope, the preparation of the sample is also difficult. According to the relevant literatures, it is necessary to adopt the melt pressing method. The microscopic analysis of fluorescence microscope shows that the dispersion of physical and mechanical has a certain effect. DSR analysis shows that the fusion of carbon nanotubes and asphalt matrix produced a change in heat. Although the change is small, it shows that the thermal stability of modified asphalt is improved by carbon nanotubes, and the compatibility between carbon nanotubes and base asphalt is achieved by the change of test method. The experimental results achieved the expected goal. Carbon nanotubes (CNTs) reduced the temperature sensitivity of the asphalt and improved the high temperature stability and low temperature cracking resistance of the modified asphalt. The experimental results of carbon nanotube modified asphalt mixture show that the modified asphalt has a good prospect in practical application.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U414

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本文編號(hào)：2263168