基于RAP料的柔性路面结构层性能研究

发布时间：2018-08-11 17:14

【摘要】：为验证旧沥青路面再生中,剩余路面结构承载力足够的情况下,RAP料直接作为柔性底基层的可行性,本文从室内试验和理论分析两方面进行了探究。通过对RAP料组成成分和强度形成机理进行分析,确定参照级配碎石的标准对RAP料进行评价。研究了不同旧路弯沉、铣刨深度、铣刨机型下RAP料的级配变化,使用灰色理论对级配进行评价,并使用CBR值和最大干密度对评价结果进行验证。通过试验探究了RAP料的CBR值影响因素,得到了未浸水CBR值和压实度的二项式回归关系。使用有侧限顶面法测量RAP料的回弹模量,证明了级配是影响RAP料回弹模量值的最大因素。设置RAP料柔性底基层后路面结构的受力情况将发生巨大的变化,通过设置不同的参数研究了路面结构的弯沉、层底拉应力、层顶压应变等力学性能的变化规律。以RAP料层和剩余路面结构作为匀质体确定当量回弹模量,完成了试验段的路面结构设计,通过试验段施工,总结了RAP料柔性底基层的施工工艺和质量控制,并对RAP料层的竣工弯沉和后期强度进行了跟踪检测。
[Abstract]:In order to verify the feasibility of using rap as the base of flexible base directly under the condition of sufficient bearing capacity of residual pavement structure in the regeneration of old asphalt pavement, this paper probes into it from two aspects of indoor test and theoretical analysis. Based on the analysis of the composition and strength formation mechanism of RAP, the standard of graded crushed stone was determined to evaluate the RAP compound. The gradation change of RAP material under different old road deflection, milling depth and milling machine type is studied. Gradation is evaluated by grey theory, and the evaluation results are verified by CBR value and maximum dry density. The factors influencing the CBR value of RAP were investigated and the binomial regression relationship between CBR value and compaction degree was obtained. The springback modulus of RAP is measured by the method of side limiting top surface. It is proved that gradation is the most important factor affecting the modulus of resilience of RAP. The mechanical properties of pavement structure such as deflection, bottom tensile stress, top compressive strain and so on are studied by setting different parameters. The equivalent modulus of resilience is determined by using the RAP layer and the remaining pavement structure as the homogeneous material, and the pavement structure design of the test section is completed. Through the construction of the test section, the construction technology and quality control of the RAP flexible base are summarized. The final deflection and later strength of RAP layer were tested.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.2

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