布敦岩沥青（BRA）改性沥青结合料使用性能研究

发布时间：2018-04-02 01:20

本文选题：布敦岩沥青　切入点：改性沥青　出处：《湖南大学》2014年硕士论文

【摘要】：近年来,产于印度尼西亚的布敦岩沥青(Buton Rock Asphalt, BRA)作为沥青改性剂,以其优良的使用性能、简便的施工工艺和合理的价格备受道路工程业界的青睐,在国内的应用也逐渐增多。但是,我国目前对BRA改性沥青及其混合料的材料设计、质量检测方法和技术指标等尚未形成系统的技术规范,因此在一定程度上限制了布敦岩沥青的推广应用。本文以50号A级石油沥青作为基质沥青,BRA作为改性剂,制备掺量分别为5%、10%、15%、20%、25%、30%和40%的改性沥青,应用不同的方法研究了BRA对基质沥青的改性效果,确定了BRA适宜的掺量范围以及性能评价指标。首先通过常规试验,分析了基质沥青和BRA改性沥青的针入度、针入度指数、软化点、延度、老化后的质量损失及针入度比等技术参数。试验结果表明,BRA的掺入可明显地改善基质沥青的高温稳定性能、感温性能及抗老化性能。但BRA中的矿物质颗粒会对改性沥青的延度造成不利影响,有必要参考BRA改性沥青混合料的试验结果,对其改性效果进行更为全面的评价。综合考虑BRA对基质沥青各方面性能的改善情况,推荐BRA的适宜掺量范围为15%～30%。其次,对基质沥青和BRA改性沥青进行了Superpave试验,并对常规试验指标和Superpave试验指标的相关性进行了分析。试验结果表明,BRA的掺入可以明显地改善基质沥青的高温性能,降低温度敏感性,增强高温抗车辙能力,两种评价方法得出的结论是一致的。另外,随着BRA掺量的增加,改性沥青的可使用温度范围较基质沥青有所扩大,这说明与基质沥青相比,BRA改性沥青更适合在温度变化比较大的地区使用。基于动态力学分析方法,探讨了温度和荷载作用频率对BRA改性沥青流变性的影响。并通过时-温等效原理将荷载作用频率从0.1rad/s～10rad/s拓宽到10-4rad/s～103rad/s,涵盖工程应用的全部频率范围,为全面研究BRA改性沥青粘弹性行为提供充分的依据。最后,综合经济、社会效益分析显示,BRA改性沥青能够改善路面的使用性能,提高路面服务水平,且符合节能环保的要求,具有良好的社会、经济效益,值得大面积推广应用。
[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.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414

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