【作者】 雷静芸；

【导师】 戴经梁；

【作者基本信息】 长安大学 ， 材料学， 2008， 硕士

【摘要】 纵观国内外沥青混合料级配设计方法,贝雷法既考虑了集料体积特性,又具有级配评价指标,在骨架密实型沥青混合料设计上具有优势。首先,本论文通过对路面结构层内部的剪切应力计算,分析了车辙变形的产生原因,并解释了伴随车辙的带状泛油现象,从结构上提出了中面层材料设计所需要保证的两个主要目标:高温抗车辙性与体积特性。其次,本论文详细分析了贝雷法设计流程,并重点讨论了设计过程中应考虑的两个因素:粗集料设计密度与0.075mm筛孔的通过率。再者,本论文在确定贝雷法的设计参数后通过贝雷方法设计出27组级配,选择综合稳定指数作为高温性能的评价标准。由于沥青混合料各档集料之间的相互影响,其在路用性能中的作用并非线性相关,由此采用贝雷法三参数表征沥青混合料级配,得到其与高温指标的多元非线性模型,并使用逐步分析的方法,确定了满足较好高温性能的贝雷法参数的取值范围。相同的方法应用于AC-20级配的体积特性分析,同样得到贝雷法三参数与矿料间隙率的多元非线性模型,并通过分析得出满足合适矿料间隙率的贝雷法参数取值范围。最后,本论文综合考虑中面层配合比设计中两个指标,从保证获得较高的高温性能与合适的矿料间隙率出发,得到优化后贝雷法三参数的取值范围,简化了贝雷法设计级配的过程,并以实际工程的目标配合比设计验证了所研究方法的实用性。更多还原

【Abstract】 Taking a wide view on gradation design methods both China and abroad, the Bailey Method not only considers the volumetric properties of the aggregate but also provides evaluating indicator of the gradation, so it posses predominance in design the skeleton density asphalt pavement .Firstly, according to analyzing the result of mechanics calculating, the asphalt middle coat is the leading area of resisting rut based on assurance certainly pavement performance. The asphalt middle coat also need ensures appropriate VMA for preferable stability. So this paper comes up with AC-20 asphalt concrete design goals as gradation design of the middle coat.Secondly, this paper analyses the steps of Bailey method, and discusses coarse aggregate designed density and 0.075mm percent of passing.Thirdly, Twenty seven groups of gradation are designed which are satisfied the condition of stone on stone contact by ways of the Bailey Method. This paper selects a new evaluation index-complex stability index to evaluate high-temperature stability of asphalt mixture. Because each specification of aggregate interact, they act on pavement performance linearly depedently.This paper introduces the three parameters of the Bailey Method to represent the gradation of asphalt concrete and comes up with multivariant non-linear model between the Bailey parameters and high-temperature evaluation index. The same method is applied to analyze volume property, just as well come up with multivariant non-linear model between the Bailey parameters and volume index.Lastly, compromisivly considering two dedign goals of the middle coat which are based on resisting rut and ensuring appropriate VMA, this paper gives reasonable range of the Bailey parameters. It simplifies Bailey dedign steps, and the paper confirms the engineering practicality of this optimistic method for the middle coat gradation.更多还原