基于碳纳米管改性沥青的结构和性能的研究
发布时间：2018-10-10 20:38
【摘要】：本文在了解国内外改性沥青发展以及碳纳米管性质的基础上,首次尝试用碳纳米管作为单纯改性剂来改性基质沥青,研究碳纳米管改性沥青的常规沥青性能的改善以及路用性能的改善,并对碳纳米管改性沥青作为微观结构分析,探索改性沥青的新发展,为纳米级碳材料改性沥青的研究与应用奠定了一定的基础。文章以研究碳纳米管对基质沥青的温度敏感性的改善为主要目的,研究了沥青常规性能,包括沥青三大指标性能、粘度指标性能以及流变性能,其中针入度、粘度和流变性试验采用较高温度,研究碳纳米管改性沥青的高温性能改善,延度采用低温,用以研究碳纳米管改性沥青的低温性能。根据改性沥青的相关文献制定了合适的配合比,从而研究碳纳米管改性沥青混合料路用性能的改善;通过对碳纳米管本身性能的了解,对碳纳米管改性沥青进行了荧光显微镜观察和差式扫描热量分析DSC的微观试验。宏观的试验主要以碳纳米管掺量的变化为主,研究不同掺量下碳纳米管改性沥青性能的变化,温度敏感性分别从高温和低温两个反面就行试验设计。微观试验主要探索碳纳米管与基质沥青的共混方式,以及通过研究基质沥青在润湿碳纳米管过程中热量的变化来分析共混机理。试验中的难点主要集中在碳纳米管在基质沥青中的分散方面,由于碳纳米管具有高团聚性,较难在基质沥青中自由均匀的分散,本文尝试用剪切乳化仪在高温下长时间的剪切以达到碳纳米管分散的最佳效果。荧光显微镜微观观察改性沥青中,由于沥青不易切片,因此样品的制备也是难点,查阅了相关文献得知需采用熔融压片法。通过荧光显微镜微观分析得知物理机械的分散起到了一定的效果。DSR的分析得知碳纳米管与基质沥青的融合产生了热量的变化,虽然变化较小但表明了碳纳米管提高了改性沥青的热稳定性,而且碳纳米管与基质沥青通过试验方法的改变达到了一定的相容。试验结果达到了预期的目的,碳纳米管降低了基质沥青的温度敏感性,提高了改性沥青的高温稳定性和低温抗裂性。碳纳米管改性沥青混合料的实验结果表明改性沥青在实际应用中有较好的前景。
[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.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414
本文编号：2263168
[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.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414
【参考文献】
相关期刊论文 前2条
1 王银龙;;浅谈沥青三大指标[J];山西建筑;2011年05期
2 杨雄麟,杨倩燕;路用改性沥青的开发动向[J];现代化工;1992年05期
，本文编号：2263168
本文链接：https://www.wllwen.com/kejilunwen/daoluqiaoliang/2263168.html
