多空隙沥青混合料堵塞行为特性研究

发布时间：2018-07-03 12:05

本文选题：多空隙沥青混合料 + 结构参数　；参考：《南京林业大学》2014年硕士论文

【摘要】：多空隙沥青路面因能提高道路安全性能和降低交通噪声而备受关注，在日本等国家被广泛运用。但是，因为孔隙堵塞导致路面排水、降噪功能失效而严重影响了多空隙沥青路面在中国更大规模的推广应用。国内鲜有对多空隙沥青路面抗堵塞能力方面的研究，由此本文通过室内模拟多空隙沥青混合料长周期排水堵塞的行为来展开对其抗堵塞性能等方面的研究，为了得出配合比设计中不同结构参数对多空隙沥青混合料对其排水和抗堵塞能力的影响规律。本文通过配合比设计制备不同结构参数（空隙率、级配、沥青种类）的单、双层多空隙沥青混合料，测试并分析了混合料相关路用性能和其影响因素。分别用变水头和常水头两种方法分别测得渗水系数Cw和渗透系数k来评价试件在堵塞行为前后及过程中透水能力变化情况，研究各结构参数对多空隙沥青混合料的排水和抗堵塞能力的影响规律，，为以提高多空隙沥青混合料排水和抗堵塞能力为设计目标的多空隙沥青混合料配合比设计提供依据。通过分析试验结果发现多空隙沥青混合料试件的空隙率越大，排水和抗堵塞能力越强。空隙率和试件未堵塞前的排水能力相关性很强并与评价试件排水能力的渗透系数k建立了相关性方程，推导了空隙率和试件被堵塞后渗透系数k的关系式。不过随着空隙率增大，混合料的结构稳定性会下降。多空隙沥青混合料的级配越粗，公称最大粒径越大，试件的抗堵塞能力越大。高弹改性沥青的使用会明显提高多空隙沥青混合料稳定性和抗疲劳能力但对抗堵塞能力的影响很小。此外通过对双层多空隙沥青混合料进行堵塞行为特性研究发现上层混合料厚度越小、空隙率越高，混合料排水和抗堵塞能力越强。通过高压清洗机使用冲洗和刷洗两种方式来清洗多空隙沥青混合料试件，评价了多空隙混合料试件的易清理程度。发现试件的空隙率越大，则越容易被清理。而双层试件上面层厚度越小，则越容易清理。双层多空隙沥青混合料较单层更容易被清理。
[Abstract]:Multi-void asphalt pavement is widely used in Japan and other countries because it can improve road safety performance and reduce traffic noise. However, due to pore blockage leading to pavement drainage, noise reduction function has seriously affected the application of multi-voids asphalt pavement in China on a larger scale. There are few researches on the anti-clogging ability of multi-voids asphalt pavement in China, so the anti-blocking performance of multi-voids asphalt mixture is studied in this paper by simulating the behavior of long-period drainage blockage of multi-voids asphalt mixture in laboratory. In order to find out the influence of different structural parameters on the drainage and blockage resistance of multi-voids asphalt mixture in mix design. In this paper, single and double layer multi-voids asphalt mixtures with different structural parameters (void ratio, gradation, asphalt type) are prepared by mix ratio design. The related road performance and its influencing factors of mixture are tested and analyzed. The permeability coefficient C w and permeability coefficient k were measured by the variable head method and the constant water head method respectively to evaluate the change of the permeability of the specimen before and after the blockage behavior and during the process. The influence of structural parameters on the drainage and blockage resistance of multi-voids asphalt mixture is studied in order to provide the basis for the mix design of multi-void asphalt mixture with the aim of improving the drainage and anti-blocking ability of multi-voids asphalt mixture. By analyzing the test results, it is found that the larger the void ratio of the multi-void asphalt mixture is, the stronger the drainage capacity and the anti-blocking ability are. There is a strong correlation between the porosity and the drainage capacity before the specimen is not plugged, and the correlation equation between the porosity and the permeability coefficient k after the specimen is blocked is established, and the relationship between the porosity and the permeability coefficient k after the specimen is blocked is deduced. However, with the increase of void ratio, the structural stability of the mixture will decrease. The thicker the gradation of multi-void asphalt mixture and the larger the nominal maximum particle size, the greater the clogging resistance of the sample. The use of high elastic modified asphalt can obviously improve the stability and fatigue resistance of multi-voids asphalt mixture, but has little effect on the resistance to blockage. In addition, it is found that the smaller the thickness of the upper layer mixture is, the higher the void ratio is, and the stronger the drainage and anti-blocking ability of the mixture is. The multi-void asphalt mixture specimens were washed by high-pressure cleaning machine in two ways: flushing and scrubbing, and the degree of easy cleaning of multi-voids was evaluated. It is found that the larger the porosity, the easier it is to be cleaned up. The smaller the upper layer of the double-layer specimen is, the easier it is to clean it. Double-layer multi-void asphalt mixture is easier to be cleaned than single-layer asphalt mixture.
【学位授予单位】：南京林业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414

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