基于试验路的乳化沥青冷再生混合料动态参数和疲劳性能研究

发布时间：2018-03-09 02:03

本文选题：乳化沥青冷再生　切入点：动态模量　出处：《山东建筑大学》2017年硕士论文　论文类型：学位论文

【摘要】：近年来,随着公路使用年限的增加,一些公路的路用性能下降,这些路面已进入大、中修养护期,势必产生大量的废旧沥青混合料,因此,路面再生技术越来越受到人们的重视。乳化沥青冷再生混合料相对传统热拌沥青混合料,生产过程相对环保,且可以最大程度的对废旧沥青混合料进行回收处理,所以对其开展研究具有重大的经济和环境效益。不同于一般研究方式,本文采用一种室内试验与试验路相结合的方式进行乳化沥青冷再生混合料动态参数和疲劳性能的研究。本文首先对原材料的各项性能进行检测,采用旋转压实法成型乳化沥青冷再生混合料试件,确定了乳化沥青冷再生混合料的配合比及最佳沥青用量和最佳含水率等指标;然后以室内试验配比为依据,对相关试验路段的铺筑过程进行了介绍(进行了试验路铺筑和现场压实度、强度等指标的检验);最后对试验路进行大规模取芯、取梁工作,开展了劈裂试验、动态模量试验、疲劳试验、OT (动态拉伸)试验,在对现场试件进行测试的基础上,对比分析了室内成型试件与试验路取回芯样之间性能的差异,并探讨了基于冷再生混合料的路面结构组合设计。通过研究发现,乳化沥青冷再生混合料最佳沥青用量3.4%,最佳含水率3.5%;通过对比乳化沥青冷再生试验路芯样和室内成型试件的劈裂数据后发现,试验路取回芯样整体劈裂强度高于实验室成型试件劈裂强度;通过对比乳化沥青冷再生混合料试验路芯样和热拌沥青混合料(HMA)动态模量、相位角后发现,乳化沥青冷再生混合料温度敏感性较热拌沥青混合料(HMA)低;通过对比乳化沥青冷再生试验路芯样和室内成型试件的动态模量、相位角后发现,乳化沥青冷再生试验路取回的芯样相比室内成型试件的模量较高,相位角较小,试验路芯样强度较高;对取回芯样进行动态拉伸(OT)试验,发现该种乳化沥青冷再生混合料具有一定的抵抗反射裂缝性能;对试验路取回芯样精确加工,进行了四点弯曲疲劳试验,得出疲劳方程,采用BISAR软件进行计算,得出设计路面使用寿命接近500万次,可以承受年限内交通荷载作用的结论。
[Abstract]:In recent years, with the increase of the service life of the highway, the road performance of some highways has declined. These roads have entered the period of large and medium repair maintenance, which is bound to produce a large number of used asphalt mixtures. The technology of pavement regeneration is paid more and more attention. Compared with the traditional hot mix asphalt mixture, emulsified asphalt cold recycled mixture is relatively environmentally friendly in production process, and it can be used to recover waste asphalt mixture as much as possible. So the research has significant economic and environmental benefits. Different from the general research methods, In this paper, the dynamic parameters and fatigue properties of emulsified bitumen cold recycled mixture are studied by a combination of laboratory test and test road. The mixture ratio, optimum asphalt dosage and moisture content of cold recycled emulsified asphalt mixture were determined by rotating compaction method, and then the ratio of indoor test was used as the basis, and the optimum asphalt content and moisture content of the cold recycled emulsified asphalt mixture were determined. This paper introduces the paving process of the relevant test road sections (including the test road paving, field compaction, strength and so on), and finally carries out large-scale coring, beam extraction, splitting test, dynamic modulus test, and so on. On the basis of testing the field specimen, the difference of the performance between the indoor shaped specimen and the core sample obtained by the test road is compared and analyzed, based on the fatigue test and the dynamic tensile test. The pavement structure combination design based on cold recycled mixture is discussed. The optimum asphalt content of emulsified asphalt cold recycled mixture is 3.4 and the optimum moisture content is 3.5. The integral splitting strength of the core sample obtained from the test road is higher than that of the laboratory formed specimen, and by comparing the dynamic modulus of the core sample and the hot mix asphalt mixture of emulsified asphalt cold recycled mixture, it is found after the phase angle, The temperature sensitivity of cold recycled emulsified asphalt mixture is lower than that of hot mix asphalt mixture. The core samples obtained from cold regeneration test road of emulsified asphalt are higher in modulus, smaller in phase angle and higher in strength than those in laboratory. It is found that this kind of cold recycled asphalt mixture has the property of resisting reflection crack, the four point bending fatigue test is carried out on the accurate processing of the core sample of the test road, and the fatigue equation is obtained, and the calculation is carried out by BISAR software. It is concluded that the service life of the designed pavement is close to 5 million times, which can withstand the traffic load within the life span.
【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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