沥青混合料骨架密实结构评价指标及性能研究

发布时间：2018-07-07 16:37

本文选题：骨架密实结构 + 级配优化设计　；参考：《长安大学》2015年硕士论文

【摘要】：骨架密实型沥青混合料是当前混合料设计发展的主要趋势,它与普通AC沥青混合料相比较,具有优良的级配组成,能够充分发挥粗集料的骨架作用和细集料对骨架空隙的填充作用。该类型的沥青混合料在路用性能及力学性能等方面都有很大的提高,增强了沥青混合料的稳定性进而有效改善了沥青路面的使用性能。骨架密实型沥青混合料级配设计的研究,对减少沥青路面病害发生、延长沥青路面使用寿命具有重要的现实意义。本论文旨在提出一种骨架密实型沥青混合料的优化设计方法。首先,对不同关键筛孔通过率组成的级配进行路用性能及力学性能试验,研究关键筛孔通过率对混合料各项性能的影响,提出混合料能够形成骨架密实结构的关键筛孔通过率推荐值。其次,利用初选的骨架密实结构评价指标与混合料路用性能指标及力学性能指标进行灰色关联分析,通过比较各骨架密实结构指标与混合料各项性能指标的相关性,选取混合料骨架密实结构的最优评价指标。在此研究基础上,提出基于耐久的骨架密实型沥青混合料的优化设计方法。最后,通过对添加了工业废渣类外掺剂的混合料进行各项性能指标的试验,研究该类型的外掺剂对混合料路用性能、力学性能及耐久性能的影响。研究表明,在沥青混合料的级配组成设计过程中,4.75mm筛孔通过率、2.36mm~4.75mm粒径集料用量对沥青混合料的路用性能及力学性能影响较大。通过对试验数据的分析研究,建议4.75mm筛孔的通过率在35%左右,2.36mm~4.75mm粒径集料用量控制在0%~5%时,混合料能够形成骨架密实结构;选取骨架密实度C作为评价沥青混合料是否形成骨架密实结构的指标,并建议其取值范围为1.06~1.10;工业废渣类外掺剂不仅对沥青混合料的路用性能和力学性能有明显的改善作用,而且对混合料耐久性能的提高也有较大的作用。
[Abstract]:The skeleton dense asphalt mixture is the main trend in the design and development of the mixture at present. Compared with the ordinary AC asphalt mixture, it has excellent gradation composition. It can give full play to the skeleton function of coarse aggregate and the filling effect of fine aggregate to skeleton void. This type of asphalt mixture has a great improvement in road performance and mechanical performance, which enhances the stability of asphalt mixture and effectively improves the performance of asphalt pavement. The research on gradation design of dense skeleton asphalt mixture has important practical significance for reducing the occurrence of asphalt pavement disease and prolonging the service life of asphalt pavement. The purpose of this paper is to put forward an optimal design method of skeleton dense asphalt mixture. Firstly, the road performance and mechanical properties of different critical sieve pass ratio are tested, and the influence of key sieve pass rate on the performance of mixture is studied. It is suggested that the critical sieve pass rate of the mixture can form a skeleton dense structure. Secondly, by using the primary evaluation index of skeleton dense structure and the road performance index and mechanical performance index of the mixture, the grey correlation analysis is carried out, and the correlation between each skeleton dense structure index and each performance index of the mixture is compared. The optimal evaluation index of the dense structure of the mixture skeleton is selected. On the basis of this research, the optimum design method of the framework dense asphalt mixture based on durability is put forward. Finally, the influence of the admixture on the pavement performance, mechanical property and durability of the mixture was studied through the test of the performance index of the mixture with the admixture of industrial waste slag. The results show that the passing rate of 4.75mm sieve hole is 2.36mm and 4.75mm particle size aggregate content has a great influence on the pavement performance and mechanical properties of asphalt mixture. Through the analysis and study of the test data, it is suggested that when the passing rate of the 4.75mm sieve hole is about 35% or so 2.36mm or 4.75mm particle size aggregate dosage is controlled in the range of 0 ~ 5, the mixture can form a dense skeleton structure. The skeleton compactness C is selected as the index to evaluate whether the asphalt mixture has formed the skeleton dense structure, and the range of its value is suggested to be 1.061.10.The industrial waste slag admixture not only improves the pavement performance and mechanical performance of asphalt mixture, but also improves the mechanical properties of asphalt mixture. Moreover, it also plays an important role in improving the durability of the mixture.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

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