沥青混合料损伤愈合性能评价方法研究

发布时间：2018-07-10 11:29

本文选题：沥青混合料 + 损伤自愈能力　；参考：《湖南大学》2014年硕士论文

【摘要】：沥青混合料的损伤自愈能力是指混合料在一定条件下自身能够部分或完全恢复材料强度、刚度并延长沥青路面的疲劳寿命，它被认为是沥青混合料抵抗疲劳开裂的重要因素。经过道路科研工作者多年的努力，沥青混合料损伤愈合性能研究有了较大的发展，但仍存在对愈合性能形成机理认识不清晰、没有有效简便的愈合性能评价方法以及混合料自愈能力提升方法难以突破等关键问题有待进一步研究。本文在借鉴已有研究成果的基础上，立足于建立科学可靠的沥青混合料损伤愈合性能研究评价方法，主要从沥青混合料损伤愈合性能影响因素分析、试验评价方法、模糊综合评价方法三个方面开展研究工作：（1）在充分学习、借鉴前人对沥青混合料损伤愈合性能的研究成果的基础上，分析并总结了影响沥青混合料损伤愈合性能的主要指标因素及其影响效果。（2）引入弹性基础小梁试验模型，建立了沥青混合料损伤愈合性能的试验评价方法：试验评价模型中采用小梁试件的弯曲强度作为混合料愈合情况的主要评价指标，基于试验基础数据与ABAQUS有限元分析结果建立了适用于本模型的含初始缺陷小梁的三点弯曲强度计算方法；然后通过试验模型的应用，分析发现该试验评价方法既可以用于研究沥青混合料的损伤愈合特性，，也可用于判定某种特定影响因素对混合料损伤愈合性能的影响，以及比较不同种类沥青混合料愈合性能的差异。（3）在分析现有研究成果及本文试验评价方法研究结果的基础上，提出了混合料损伤愈合性能评价指标体系。对于定量连续型指标，采用4类共16种隶属度函数描述方法；对于定性离散型指标，采用经验赋值方法，然后引入依次评价原则、共同评价原则及改进的层次分析法，建立总体与多层次的两种模糊综合评价模型。最后通过实例应用，验证了两种模糊综合评价方法在评价沥青混合料损伤愈合性能方面的可行性和有效性。
[Abstract]:The damage self healing ability of asphalt mixture is that the mixture can partially or completely recover the strength, stiffness and fatigue life of asphalt pavement under certain conditions. It is considered as an important factor to resist fatigue cracking of asphalt mixture. After years of efforts by road researchers, the damage healing performance of asphalt mixture is also considered. There is a great development in the study, but there is still a lack of understanding of the formation mechanism of healing properties, the lack of effective and simple method for evaluating the healing performance and the difficulty of breaking through the method of improving the self healing ability of the mixture. This paper is based on the establishment of scientific and reliable asphalt on the basis of the existing research results. The research evaluation method of the damage healing performance of the mixture is mainly from the analysis of the factors affecting the damage healing performance of asphalt mixture, the method of test evaluation, and the fuzzy comprehensive evaluation method in three aspects.
(1) on the basis of the achievements of previous research on the damage healing performance of asphalt mixture, the main factors and effects on the damage healing performance of asphalt mixture are analyzed and summarized.
(2) introducing the elastic foundation trabecular test model, a test evaluation method for the damage healing performance of asphalt mixture is established: the bending strength of the trabecular specimen is used as the main evaluation index of the mixture healing in the test evaluation model. Based on the test base data and the ABAQUS finite element analysis result, the initial content of the model is established. The three point bending strength calculation method of the initial defect trabecula is obtained. Then through the application of the experimental model, it is found that the test evaluation method can be used to study the damage healing properties of asphalt mixture, and also to determine the effect of certain influence factors on the damage healing performance of the mixture, and to compare the different kinds of asphalt mixture. Differences in healing properties.
(3) on the basis of the analysis of the existing research results and the results of the experimental evaluation method, the evaluation index system for the damage healing performance of the mixture is proposed. For the quantitative continuous index, the 4 categories of 16 kinds of membership function description methods are adopted, and the empirical valuation method is adopted for the qualitative discrete index, and then the sequential evaluation principle is introduced. The common evaluation principle and the improved analytic hierarchy process (AHP) are used to establish two fuzzy comprehensive evaluation models of overall and multi-level. Finally, the feasibility and effectiveness of the two fuzzy comprehensive evaluation methods in evaluating the damage healing performance of asphalt mixture are verified by the application of the two fuzzy comprehensive evaluation methods.
【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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