碾压混凝土基层在高速公路中的应用研究

发布时间：2018-08-14 17:21

【摘要】：沥青混凝土路面以其表面平整、无接缝、行车舒适、振动小、噪音低、耐磨、不扬尘易清洗、施工期短、养护维修简便可再生利用等优点得以广泛使用。目前，广东省高速公路中以沥青混凝土路面加半刚性基层的这种结构使用比较广泛，随着交通量的持续增长，车辆轴载以及重车比例的增大，这种半刚性基层沥青路面发生了大量的不同程度的早期损坏。根据调查发现，路面使用质量和使用寿命达不到应有水平，其主要原因是基层强度不足或基层强度衰减较快导致。实践证明，在高等级公路尤其是重交通路段上，，现有的半刚性基层材料，不足以适应交通发展的要求，需要采用新的强度更高的基层材料，以保证路面的使用品质。广东省地属高温、多雨的经济发达地区，交通量和交通轴载均较大，沥青路面早期破坏也较为严重，如何解决我省沥青路面早期病害问题，仍然是道路工作者们所面临的一项艰巨任务。针对广东地区在重载交通下易出现的沥青路面裂缝、坑槽、唧泥、车辙等早期损坏，特别是长大陡坡段的路面车辙等病害，尝试采用碾压混凝土刚性基层沥青路面结构，以期解决广东地区重载交通作用下的路面耐久性问题。基于碾压混凝土基层的耐久性沥青路面结构，与传统意义上的RCC+AC复合式路面，以及旧水泥混凝土路面加铺沥青面层等结构在材料特性和受力情况等方面较为相似，但又各具特性。因此，本研究在借鉴这些路面结构的应力分析理论和方法的基础上，根据碾压混凝土基层耐久性沥青路面结构的特点，对优质碾压混凝土基层施工难点、关键控制点进行进一步研究，从而不断积累经验和提高碾压混凝土路面基层的施工质量。
[Abstract]:Asphalt concrete pavement is widely used because of its smooth surface, no joint, comfortable driving, low vibration, low noise, wear resistance, easy cleaning, short construction period, easy maintenance and recycling. At present, the structure of asphalt concrete pavement with semi-rigid base is widely used in Guangdong expressway. According to the investigation, the service quality and service life of the semi-rigid base asphalt pavement can not reach the proper level. The main reason is that the base strength is insufficient or the base strength decays quickly. Existing semi-rigid base materials are not enough to meet the requirements of traffic development in expressways, especially in heavy traffic sections. It is necessary to adopt new and higher strength base materials to ensure the quality of pavement. Guangdong Province is a high-temperature and rainy economically developed area with large traffic volume and axle load, and early damage of asphalt pavement. It is also more serious. How to solve the problem of early disease of asphalt pavement in our province is still a difficult task for road workers.
Aiming at the early damage of asphalt pavement, such as cracks, pits, mud, ruts and so on, which are easy to occur under heavy traffic in Guangdong area, especially the ruts on long and steep slopes, the roller compacted concrete rigid base asphalt pavement structure is tried to solve the problem of pavement durability under heavy traffic in Guangdong area.
The durable asphalt pavement structure based on roller compacted concrete base course is similar to the traditional RCC+AC composite pavement and the overlay asphalt pavement of old cement concrete pavement in material characteristics and stress conditions, but each has its own characteristics. Therefore, this study draws lessons from the stress analysis theory and formula of these pavement structures. On the basis of the method, according to the characteristics of the durable asphalt pavement structure of the roller compacted concrete base, the construction difficulties and key control points of the high quality roller compacted concrete base are further studied, so as to accumulate experience and improve the construction quality of the roller compacted concrete base.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.2

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