控制横向开裂率的沥青路面结构组合研究

发布时间：2018-06-08 13:47

本文选题：温缩系数 + 干缩系数　；参考：《哈尔滨工业大学》2016年硕士论文

【摘要】：调查表明,横向裂缝已成为半刚性沥青路面最主要的病害之一。目前从材料特性角度提高路面抗裂性能的研究较多,包括提高沥青混合料低温性能、提高半刚性基层材料抗收缩性能等,但从优化结构组合角度提高沥青路面抗裂性能的研究还很少。因此,文章在分析吉林省典型路面结构形式的基础上,测定基层与面层单体材料的收缩系数以及不同结构组合试件的温缩系数,并提出不同结构组合试件的理论温缩系数公式。进而考虑沥青面层与基层之间的相互制约关系,给出了不同结构组合的横向温缩裂缝间距计算方法,并分析各个相关因素对结构组合横向温缩裂缝间距的影响,最终提出控制横向裂缝间距的措施,给出吉林省地区适宜的路面结构组合形式。主要研究内容如下:首先,分析了沥青路面的横向开裂机理,并结合吉林省路面的典型结构形式及横向开裂情况确定了试验的材料类型及级配设计。接着在前人试验方法研究的基础上设计出简易可靠的温缩系数及干缩系数试验方法,测定了面层的温缩系数与基层的温缩系数、干缩系数,并分析各个相关因素变化对试件温缩系数、干缩系数的影响。其次,根据面层及基层单体试件的温缩系数试验结果,选取6种典型的面层与基层组合试件,分别测定它们各代表厚度处的温缩系数,并和理论分析得出的温缩系数进行对比分析,进而验证组合试件理论温缩系数公式的准确性。最后,建立面层与基层组合结构收缩变形分析的相关模型,综合考虑温缩和干缩作用,推导出组合结构的面层和基层横向裂缝间距公式。接着分析了各相关因素变化对路面横向裂缝间距的影响,并提出控制路面横向开裂的一系列措施。最终,对比分析不同结构组合的平均裂缝间距,给出吉林省适宜的结构组合形式。
[Abstract]:The investigation shows that the transverse crack has become one of the most important diseases of semi-rigid asphalt pavement. At present, there are many researches on improving pavement crack resistance from the point of view of material characteristics, including improving the low temperature performance of asphalt mixture, improving the shrinkage resistance of semi-rigid base materials, etc. However, there is little research on how to improve the crack resistance of asphalt pavement from the angle of optimizing structure combination. Therefore, based on the analysis of typical pavement structure in Jilin Province, the shrinkage coefficient of single base and surface material and the temperature shrinkage coefficient of different structural combination specimens are measured, and the theoretical formula of temperature shrinkage coefficient of different structural composite specimens is put forward. Then considering the mutual restriction relationship between asphalt surface and base, the calculation method of transverse temperature shrinkage crack spacing of different structure combination is given, and the influence of each relevant factor on the transverse temperature shrinkage crack spacing of structure combination is analyzed. Finally, the measures to control the transverse crack spacing are put forward, and the suitable pavement structure combination form in Jilin Province is given. The main research contents are as follows: firstly, the transverse cracking mechanism of asphalt pavement is analyzed, and combined with the typical structure and transverse cracking of Jilin Province pavement, the material types and gradation design of the test are determined. Then a simple and reliable test method of temperature shrinkage coefficient and dry shrinkage coefficient is designed on the basis of the previous experimental methods. The temperature shrinkage coefficient of the surface layer and the temperature shrinkage coefficient of the base layer and the dry shrinkage coefficient are measured. The influence of each related factor on the temperature shrinkage coefficient and dry shrinkage coefficient of the specimen was analyzed. Secondly, according to the test results of the temperature shrinkage coefficient of the surface layer and the basic unit specimen, the temperature shrinkage coefficient of each representative thickness of the six kinds of typical surface layer and the base layer composite specimen is measured respectively. By comparing with the temperature shrinkage coefficient obtained by theoretical analysis, the accuracy of the theoretical formula of temperature shrinkage coefficient of the combined specimen is verified. Finally, a model is established for the analysis of shrinkage and deformation of the composite structure of the surface and the base, and the formula of transverse crack spacing between the surface and the base of the composite structure is derived by considering the effects of temperature shrinkage and dry shrinkage. Then, the influence of relative factors on the pavement transverse crack spacing is analyzed, and a series of measures to control the pavement transverse crack are put forward. Finally, the average crack spacing of different structural combinations is analyzed, and the suitable structure combination form in Jilin Province is given.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U416.217

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