不同机理温拌沥青混合料的路用性能研究

发布时间：2018-03-10 17:18

本文选题：热拌　切入点：温拌　出处：《重庆交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：目前,应用范围十分广泛的传统热拌沥青混合料(Hot Mix Asphalt,HMA)自沥青路面开始大规模应用以来一直是我国沥青路面的主要材料。而各种各样的问题如：产生大量的有害气体以及粉尘,严重污染环境并且影响施工人员的身体健康大量、消耗能源一直是HMA的缺陷。为了较好地解决HMA存在的这些HMA无法避免的弊端,经过长期的努力,广大的道路工作者们研发了温拌沥青混合料(Warm Mix Asphalt,WMA)技术。所谓WMA技术就是指采用一定的技术措施,通过在一定程度上降低沥青的粘度或者沥青与集料间的粘度来降低沥青混合料的拌和及压实温度,同时保证WMA的路用性能不低于甚至高于HMA。文章系统地介绍了常见的三类温拌添加剂：Sasobit、Aspha-min以及EvothermDAT的作用机理,通过室内试验如：沥青的三大指标试验、布氏粘度试验、RTFOT试验以及DSR试验分析评价了不同种类温拌剂对70#基质沥青的影响,并以HMA作为参照,采用传统的车辙试验、小梁弯曲试验、冻融劈裂试验等方法在相同的试验室条件下评价比较了三种温拌沥青混合料的路用性能。研究表明：三种温拌沥青混合料的路用性能(高温稳定性、低温抗裂性、水稳定性)均满足规范的技术要求；在此基础上,Sasobit可以提高温拌沥青混合料的高温稳定性、低温抗裂性但其对水稳定性有一定的负面影响；同时,研究认为Aspha-min可以提高温拌沥青混合料的高温稳定性,但其对沥青混合料的低温抗裂性和水稳定性都有一定的负面影响；Evotherm DAT可以提高混合料的水稳定性但其高温稳定性和低温抗裂性有一定程度的降低。此外,本文结合省道206线文山城区过境段路面工程,系统介绍了WMA在实际工程中的应用情况,并在工后对WMA的路用性能进行了评价,结果表明,WMA的路用性能良好,对环境污染较少。室内试验及工程应用表明,WMA的性能与HMA相差不大但在节能减排、延长施工季节方面具有显著优势。在此基础上,本文对WMA的应用范围进行了展望。同时,对温拌沥青的低温性能以及耐疲劳性还需要进一步的研究。
[Abstract]:At present, Hot Mix Asphalt HMA, which is widely used in traditional asphalt mixture, has been the main material of asphalt pavement in China since the large-scale application of asphalt pavement, and a variety of problems such as the production of a large number of harmful gases and dust, Seriously pollute the environment and affect the health of the construction personnel. Energy consumption has always been the defect of HMA. In order to solve the unavoidable disadvantages of HMA in HMA, after a long period of effort, The vast number of road workers have developed the Warm Mix AsphaltMA. the so-called WMA technology refers to the adoption of certain technical measures. By reducing the viscosity of asphalt or the viscosity between asphalt and aggregate to a certain extent, to reduce the mixing and compaction temperature of asphalt mixture, At the same time, the road performance of WMA is not lower than or even higher than that of WMA. This paper systematically introduces three kinds of warm mixing additives: 1. Sasite Aspha-min and the action mechanism of EvothermDAT. Brinell viscosity test, RTFOT test and DSR test were used to analyze and evaluate the effect of different kinds of warm mixing agents on 70# base asphalt. The traditional rutting test and trabecular beam bending test were used as reference to HMA. The pavement performance of three kinds of warm mix asphalt mixture is evaluated and compared under the same laboratory conditions by freeze-thaw splitting test. The results show that the pavement performance of the three kinds of warm mix asphalt mixture (high temperature stability, low temperature crack resistance, high temperature stability, low temperature cracking resistance, etc.). On the basis of this, Sasobit can improve the high temperature stability of warm mix asphalt mixture, but it has some negative effect on water stability. It is considered that Aspha-min can improve the high temperature stability of warm mix asphalt mixture. However, Evotherm DAT can improve the water stability of asphalt mixture, but its high temperature stability and low temperature crack resistance can be reduced to a certain extent. In this paper, the application of WMA in practical engineering is systematically introduced, and the road performance of WMA is evaluated after construction. The results show that the road performance of WMA is good. The indoor test and engineering application show that the performance of WMA is not different from that of HMA, but it has remarkable advantages in energy saving and emission reduction, and prolonging the construction season. On this basis, the application scope of WMA is prospected in this paper. Further research is needed on the low temperature performance and fatigue resistance of warm mix asphalt.
【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

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