埃塞AA高速公路高模量沥青混凝土基层施工技术探究

发布时间：2018-01-09 22:03

本文关键词：埃塞AA高速公路高模量沥青混凝土基层施工技术探究　出处：《长安大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着全球经济的不断发展,非洲地区的交通建设呈现高速发展态势。但由于交通基础差,路网稀疏、路况不佳,严重制约其经济的发展和民生环境的改善。因此该地区的大部分道路亟待改造或重建,并且许多非洲国家的国家公路网道路等级也逐步从柔性土路、柔性沥青表处路面向经济效益好、使用寿命长,且在运营期间不需维护或较少维护的柔性沥青混凝土路面发展。而从当前柔性沥青混凝土路面的发展趋势和研究实验结果来看,采用高模量沥青混凝土基层柔性路面其更好的抗车辙、扩散荷载的能力,更长的使用寿命,更低的总体造价以及更快的建设周期恰恰为该地区快速缓解迫在眉睫的交通压力提供了捷径。本文依托埃塞俄比亚首都亚的斯亚贝巴至阿达玛高速公路(简称AA高速)的工程建设,主要对适用于埃塞气候、交通特点下高速公路高模量沥青混凝土基层施工技术进行研究和总结。由于该技术在非洲地区尚属首次应用,因此本次研究的技术依据基于国内对该项技术的一些研究经验和国内现行的高速公路建设技术规范、试验规程等。研究首先对AA高速实际使用的集料和沥青等原材料进行试验检验,从而确定了初定的路用原材料性能均能满足工程实施的需求。其次,为了寻求满足高模量沥青混合料技术性能的高模量剂和高模量剂最佳掺量,优化高模量混合料施工成本,本研究还对多种高模量剂进行了最佳油石比状态下的马歇尔实验、车辙试验等比选试验和施工性能、经济型等方面的比选,从而选定了实施用高模量剂和最佳掺量。接下来本研究针对工程实施需求的混合料要求进行了目标配合比和生产配合比的设计与验证,从而论证了高模量沥青混合料在高温抗车辙、残留稳定度比、冻融劈裂强度、破坏劲度模量及抗老化性能等方面均优于其他外加剂改性沥青混合料的大量实验室结论。随后,选定长度为200m的一段路基进行了HMAC-25高模量基层的试铺试验,并以此为依据开展了AA高速公路HMAC-25高模量基层的大面积施工。施工过程中针对现场实际情况对部分施工参数进行了适当调整,并对各项路用性能指标陆续进行了自检及抽检工作,最终确定了高模量基层施工工艺。通过对埃塞俄比亚AA高速公路高模量基层依托工程的修筑过程进行研究总结,验证了掺加高模量剂后,高模量沥青混合料的抗车辙性能和水稳定性均得到了大幅度的增强,且施工工艺简单、易操作,其工程各项检测结果均达到了预期目标,符合非洲地区当前改善路网的路面发展需求。同时通过本项目的实施和研究总结了高模量沥青混合料在原材料选择、配合比设计、混合料拌合、运输、摊铺、碾压等实施过程中的大量施工生产控制参数,取得了一定的实践经验,为高模量沥青混凝土路面在非洲地区的推广应用,为国内沥青路面技术的发展以及其他国家、地区沥青路面的发展积累更多更好的经验。
[Abstract]:With the continuous development of the global economy, Africa's transportation construction showing a trend of rapid development. But because of the traffic infrastructure is poor, sparse network, poor road conditions, seriously restrict the development of its economy and people's livelihood environment improvement. Therefore most of the roads in the area need improvement or reconstruction, and many African countries of the national road network, road grade gradually from the soft soil road, flexible asphalt surface road for good economic benefit, long service life, less maintenance and maintenance or flexible asphalt concrete pavement without during operation. From the current development trend of flexible asphalt concrete pavement and Study on the experimental results, the rutting resistance of high modulus asphalt concrete base flexible pavement is better the ability to spread load, longer service life, lower overall cost and faster construction period just as fast slow in the region forced in solution The traffic pressure provides a shortcut. This paper relies on the Ethiopia capital Addisababa to Adama highway (referred to as AA) of the project, mainly for Ethiopia climate, traffic characteristics of highway construction technology of high modulus asphalt concrete base were studied and summarized. Because the technology is still used for the first time in Africa, so the technology on the basis of this based on the domestic research on the technology of the current domestic highway construction experience and technical specifications, test procedures and so on. Firstly, the actual use of AA high speed of asphalt and other raw materials were tested, so as to determine the initial road material performance can satisfy the engineering demand. Secondly, the implementation of in order to meet the high modulus, high modulus agent agent and the best dosage of high modulus asphalt mixture performance, optimization of high modulus mixture The material construction cost, the study of a variety of high modulus agent the optimum asphalt content under the condition of the Marshall test, rutting test and construction performance test geometric selection, selection and other aspects of the economy, and the implementation of high modulus agent and the optimal dosage. The next research project implementation demand for needle mixture the requirements of the target mix and match the design and verification of production ratio, which proves that the high modulus asphalt mixture in high temperature rutting, residual stability, freeze-thaw splitting strength, stiffness modulus and failure of a large number of laboratory conclusion anti aging properties superior to other additive modified asphalt mixture. Then, the selected length is 200m a section of subgrade for HMAC-25 high modulus of base of the test shop test, and on the basis of the construction of large area AA highway HMAC-25 high modulus of base construction process for. The actual situation of the scene of the adjustment of some construction parameters, and the road performance indexes have carried out self inspection and sampling work, and ultimately determine the construction process of high modulus of base. This paper studies through the construction process of Ethiopia AA expressway high modulus of base project, verify the agent with high modulus, high modulus asphalt the rutting resistance performance and water stability was enhanced greatly, and the construction process is simple, easy to operate, the project of the test results are to achieve the desired goal, meet the development needs of Africa as the road network improvement. At the same time, through the implementation of this project and summarizes the high modulus asphalt mixture selection in the raw materials, mix design, mixing, transportation, paving, rolling in the process of implementation of the construction of a large number of production control parameters, achieved some real Practical experience has promoted the application of high modulus asphalt concrete pavement in Africa, and accumulated more and more experience for the development of domestic asphalt pavement technology and the development of asphalt pavement in other countries.

【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.2

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