农村公路冷再生沥青路面材料和结构研究

发布时间：2018-01-16 08:24

本文关键词：农村公路冷再生沥青路面材料和结构研究　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：冷再生技术既经济又环保，符合当前我国可持续发展的战略方针，具有很大的发展优势，势必会在我国农村公路的旧路养护和改造中得到广泛的应用。在此情况下，研究农村公路冷再生沥青路面的结构设计指标及对无机结合料稳定冷再生方案进行对比分析，推荐出再生方案，进而推荐出农村公路冷再生路面的典型结构很有必要。为了研究农村公路沥青路面设计指标，本文首先参考大量相关文献，对我国农村公路的典型结构和病害进行汇总分析，得出我们农村公路的8种典型结构及坑槽、网裂等主要病害；然后，用ABAQUS对我国农村公路典型结构进行力学分析，得出我国农村公路的受力特点：沥青层疲劳寿命小于累计当量轴次，基层底部疲劳寿命约有41.7%的小于累计当量轴次，路基顶面的竖向压应变大于其容许压应变，面层顶面的温度应力部分大于其劈裂强度，基层顶面的温度应力部分大于其劈裂强度，面层底面的综合应力小于沥青混合料的抗拉强度，基层底部的综合应力部分大于其劈裂强度；最后，针对我国农村公路的病害和受力特点提出我国农村公路的设计指标：在《公路沥青路面设计规范（征求意见稿）》提出的无机结合料层疲劳开裂、路基顶面的永久变形、沥青层永久变形、沥青面层低温开裂的基础上增加了基层低温开裂、基层底部极限开裂指标。在冷再生混合料的配合比设计研究方面，针对我国农村公路冷再生混合料的性能要求，提出7d无侧限抗压强度、28d弯拉强度、60d抗压回弹模量、温缩系数、软化系数、工程造价指标，并依据上述指标对12种配合比方案进行比选。对于水泥稳定方案，推荐配合比为5:95；对于二灰稳定方案，推荐配合比为5:12.5:82.5；对于水泥粉煤灰稳定方案，推荐配合比为5:15:80；对于水泥石灰稳定方案，推荐配合比为5:10:85。对各稳定方案的推荐配合比进行对比，推荐出最佳稳定方案为5:15:80的水泥粉煤灰稳定方案。最后推荐出菏泽地区农村公路冷再生沥青路面各稳定方案的典型结构。
[Abstract]:Cold regeneration technology is not only economic and environmental protection, in line with the current strategic policy of sustainable development in China, has a great development advantage. It is bound to be widely used in the maintenance and reconstruction of old roads in rural areas in China. This paper studies the structural design index of cold recycled asphalt pavement of rural highway and makes a comparative analysis of the stable cold regeneration scheme of inorganic binder and recommends the regeneration scheme. Furthermore, it is necessary to recommend the typical structure of cold-regenerated road surface in rural areas. In order to study the design index of asphalt pavement of rural highway, this paper first refer to a large number of relevant documents, and analyze the typical structure and disease of rural highway in China. Eight typical structures of our rural highway and main diseases such as pothole and net crack are obtained. Then, the mechanical analysis of typical structure of rural highway in China is carried out with ABAQUS, and the mechanical characteristics of rural highway in China are obtained: the fatigue life of asphalt layer is less than accumulative equivalent axis. The fatigue life of the base bed is about 41.7% less than the cumulative equivalent axis, the vertical compressive strain of the top surface of the subgrade is greater than its allowable compressive strain, and the temperature stress of the top surface of the surface is larger than its splitting strength. The temperature stress of the top surface of the base is greater than its splitting strength, the comprehensive stress of the bottom of the surface is smaller than the tensile strength of the asphalt mixture, and the comprehensive stress of the base is larger than its splitting strength. Finally, according to the disease and mechanical characteristics of rural highway in China, the design index of rural highway in China is put forward: fatigue cracking of inorganic binder layer in "Design Code for Highway Asphalt pavement (draft for advice)". On the basis of the permanent deformation of the top surface of the subgrade, the permanent deformation of the asphalt layer and the low temperature cracking of the asphalt surface, the cracking index of the base temperature and the limit of the base base are increased. In the aspect of mix ratio design of cold recycled mixture, according to the performance requirements of cold recycled mixture in rural highway of our country, the unconfined compressive strength of 7 days and the flexural tensile strength of 28 days and the compressive resilience modulus of 60 days are put forward. Temperature shrinkage coefficient, softening coefficient, engineering cost index, and according to the above indexes, 12 mix ratio schemes are compared and selected. For cement stabilization scheme, the recommended mix ratio is 5: 95; For the lime-fly ash stabilization scheme, the recommended mix ratio is 5: 12.5: 82.5; For cement fly ash stabilization scheme, the recommended mix ratio is 5: 15: 80; For the cement lime stabilization scheme, the recommended mix ratio is 5: 10: 85. The recommended mix ratio of each stabilization plan is compared. It is recommended that the best stabilization scheme is the cement fly ash stabilization scheme of 5: 15: 80. Finally, the typical structure of each stabilization scheme of cold recycled asphalt pavement for rural highway in Heze area is recommended.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.26;U414

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