沥青与沥青混合料低温性能评价方法的研究

发布时间：2018-05-11 07:49

本文选题：低温开裂 + 评价方法　；参考：《山东建筑大学》2017年硕士论文

【摘要】：目前,随着交通业的发展,沥青路面仍然存在着许多未解决的问题,其中低温开裂是造成路面破坏的问题之一。针对沥青路面的低温开裂问题,世界上很多国家一直致力于研究路面抗裂设计和材料的低温性能指标的研究,并提出了很多关于沥青路面低温性能的评价指标。但如何将材料的低温指标与路用性能联系起来,还需要做进一步的研究。本文通过对沥青路面低温开裂评价方法的研究,将沥青及沥青混合料的低温评价方法与其路用性能联系起来,为了更好的评价沥青混合料的低温性能,探索沥青低温性能与沥青混合料低温性能评价方法的相关性,本文主要通过室内试验的研究对沥青和沥青混合料低温评价方法的合理性提供参考意见。首先,本文使用四种沥青(70#基质沥青、90#基质沥青、SBS改性沥青和橡胶改性沥青)对沥青低温评价方法进行研究,根据我国的针入度分级体系,以及SHRP的PG分级体系中表征沥青低温性能的评价方法,包括低温延度、脆点和弯曲梁流变试验(BBR)进行研究,同时基于Burgers模型,运用非线性拟合得到粘弹参数来分析温度对粘弹参数的影响,得到可评价沥青低温性能的综合柔量参数。依托山东高速集团的最新仪器设备APTTS进行约束试件温度应力试验,在中国被称为冻断试验,此试验是目前世界上公认的对沥青混合料低温性能最好的评价方法。选择四种沥青(70#、90#、SBS、橡胶)以及AC-13和SMA-13沥青代表性的混合料进行配合比设计,对我国的施工技术规范中沥青混合料低温评价方法低温弯曲试验和试验规程中的低温劈裂试验进行对比分析,得到的试验评价指标为下一章的研究进行准备。最后一章为了获得较为合理的沥青与沥青混合料低温性能评价方法和指标,运用灰关联分析,计算出沥青与沥青混合料低温评价指标的与约束试件温度应力试验中冻断温度之间的关联度大小,对得到的关联度进行大小排序研究分析,为确定合理的沥青与沥青混合料低温性能评价方法和指标提供参考意见。
[Abstract]:At present, with the development of traffic industry, there are still many unsolved problems in asphalt pavement, among which low temperature cracking is one of the problems that cause pavement damage. In view of the problem of low temperature cracking of asphalt pavement, many countries all over the world have been devoting themselves to studying the design of pavement crack resistance and the low temperature performance index of materials, and put forward a lot of evaluation indexes about the low temperature performance of asphalt pavement. However, further research is needed on how to relate the low temperature index of the material to the road performance. Through the research on the evaluation method of asphalt pavement low temperature cracking, this paper links the low temperature evaluation method of asphalt and asphalt mixture with its road performance, in order to better evaluate the low temperature performance of asphalt mixture. In order to explore the correlation between asphalt low-temperature performance and asphalt mixture low-temperature performance evaluation method, this paper mainly through the laboratory test of asphalt and asphalt mixture low-temperature evaluation method to provide a reference for the reasonableness. First of all, this paper studies the low temperature evaluation method of bitumen by using four kinds of bitumen, such as Asphalt No. 70# Base Asphalt, Asphalt modified Asphalt (SBS) and Rubber modified Asphalt, and according to the grading system of penetration degree of asphalt in our country, the evaluation method of asphalt at low temperature is studied. And the evaluation methods of asphalt performance at low temperature in PG classification system of SHRP, including low temperature ductility, brittle point and bending beam rheology test, were studied, and based on Burgers model, The influence of temperature on viscoelastic parameters was analyzed by nonlinear fitting, and the comprehensive compliance parameters were obtained to evaluate the low temperature performance of asphalt. The temperature stress test of restrained specimens based on the latest instrument and equipment APTTS of Shandong High Speed Group is called freezing breaking test in China. This test is recognized as the best method to evaluate the low temperature performance of asphalt mixture in the world. The mixture of four kinds of asphalt, such as Asphalt 70, #C90 #Ss, rubber) and AC-13 and SMA-13 bitumen, is selected for mix design. The low temperature evaluation method of asphalt mixture in the construction technical code of our country is compared with the low temperature splitting test in the test code and the low temperature bending test in the test code. The obtained test evaluation index is prepared for the next chapter. In the last chapter, in order to obtain reasonable evaluation method and index of asphalt and asphalt mixture's low temperature performance, grey correlation analysis is used. The correlation degree between the low temperature evaluation index of bitumen and bituminous mixture and the frozen break temperature in the temperature stress test of restrained specimens is calculated and the degree of correlation is studied and analyzed. It provides reference for determining reasonable evaluation method and index of low temperature performance of asphalt and asphalt mixture.
【学位授予单位】：山东建筑大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U414

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