半刚性基层材料体积参数与疲劳性能研究

发布时间：2018-01-14 00:29

本文关键词：半刚性基层材料体积参数与疲劳性能研究　出处：《重庆交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：半刚性基层是我国应用最为广泛的基层形式,不仅在路面使用效果方面性能良好,而且从经济角度分析也非常符合我国高速公路建设对资源与环境的要求,在我国有着广阔的应用前景。随着现代高性能施工机械的发展和对路面使用要求的不断提高,需要对半刚性基层材料的参数指标和常用的水泥稳定级配碎石材料的疲劳性能进行更加深入的研究。为了分析不同参数对水泥稳定级配碎石材料性能的影响,文中采用CBG-25的设计方法,在26.5mm和0.075mm通过率确定的情况下,以4.75mm通过率和水泥剂量作为变量因素,每个因素采用5个水平标准,使用均匀设计法设计出十种配合比方案。十种配合比方案分别使用重型击实法、静压法、旋转压实法成型,通过对三种方法成型试件的最佳含水率和最大干密度的研究,评价击实法与静压法压实效果的差异,并结合试验经验,对使用旋转压实仪成型水泥稳定级配碎石材料方法的适用范围进行分析。借鉴沥青混合料体积参数,研究水泥稳定级配碎石材料最大理论密度、空隙率、骨架间隙率和水泥浆饱和度。使用试验与计算结合的方法测定材料的理论最大密度,然后采用塑封法测量试验件的毛体积密度,总结出一套半刚性材料适用的体积参数测定方法。计算十组配合比的体积参数,使用DPS数据处理系统对两个影响因素与体积参数进行回归分析,分析影响的效果。分别测定十种配合比方案的7天无侧限抗压强度、抗压回弹模量然后,结合各自方案体积参数进行分析,总结体积参数与力学性能之间的关系。再选取其中五组配合比进行中梁的疲劳性能研究。中梁的疲劳试验采用应力控制模式,以断裂作为破坏标准,讨论空隙率等体积参数对水泥稳定级配碎石材料疲劳寿命的影响。
[Abstract]:Semi-rigid base is the most widely used base in our country. It not only has good performance in pavement use effect, but also accords with the requirements of resources and environment of highway construction in China from the economic point of view. With the development of modern high-performance construction machinery and the continuous improvement of pavement use requirements. In order to analyze the influence of different parameters on the properties of cement stabilized graded macadam, it is necessary to study more deeply the parameters of semi-rigid base material and the fatigue performance of cement stabilized graded macadam. In this paper, the design method of CBG-25 is used to determine the passing rate of 26.5mm and 0.075mm, and the passing rate of 4.75mm and the dosage of cement are taken as variable factors. Each factor adopts five horizontal standards, and ten mix proportion schemes are designed by uniform design method. Ten mix proportion schemes are formed by heavy compaction method, static pressure method and rotary compaction method respectively. Through the study of the optimum moisture content and maximum dry density of the three methods, the difference of compaction effect between compaction method and static pressure method is evaluated, and the experimental experience is combined. The scope of application of the method of forming cement-stabilized graded macadam with rotary compactor is analyzed. The maximum theoretical density and void ratio of cement-stabilized gradation macadam are studied by referring to the volume parameters of asphalt mixture. Skeleton clearance rate and slurry saturation. The theoretical maximum density of the material was determined by means of combination of test and calculation, and then the bulk density of the specimen was measured by plastic sealing method. A set of volume parameters measurement method for semi-rigid materials was summarized. The volume parameters of ten groups of mix ratio were calculated and the regression analysis of two influencing factors and volume parameters was carried out by using DPS data processing system. Analysis of the effect of the effect. 10 mix ratio of the seven days unconfined compressive strength, modulus of resilience, then combined with the volume parameters of the respective analysis. The relationship between the volume parameters and the mechanical properties is summarized. Then five groups of mixed ratio are selected to study the fatigue behavior of the middle beam. The fatigue test of the middle beam adopts stress control mode and fracture as the failure criterion. The effect of volume parameters such as porosity on fatigue life of cement stabilized graded macadam is discussed.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

【共引文献】