基于湿热气候的老挝沥青路面分区及沥青混合料性能评价方法研究
发布时间：2019-05-24 08:25
【摘要】：目前老挝沥青混合料设计没有统一的规范，，而且调查发现老挝路面的病害主要是由于雨量过多和高温引起的水损害和车辙，考虑老挝的湿热气候特点，开展沥青混合料性能评价方法研究，对老挝沥青混合料的设计提供一定的参考价值，对老挝公路建设具有重要的意义。 首先分析了老挝湿热系数的概率分布状况，绘制了基于湿热系数的沥青路面气候分区图。通过对老挝的年降雨量分析发现年降雨量普遍在2000mm以上，沥青路面会由于行车荷载而形成的动水压力作用造成严重的损害，针对沥青路面的动水冲刷破坏机理及评价方法的不足，使用相对简易的动水冲刷试验来评价沥青混合料的水稳定性，采用CT扫描技术和红外光谱对试件进行试验，分析了动水冲刷前后沥青混合料内部空隙率和材料的变化规律，验证了动水冲刷仪评价沥青混合料的水稳定性的可行性。并根据动水冲刷系统提出适合老挝的沥青路面水稳定性评价方法。分析影响水稳定性的主要内在因素，然后通过动水冲刷试验、冻融循环劈裂试验和静态模量试验，得出不同沥青混合料在水稳定性较佳时的最佳体积参数，推荐出适合老挝的常规水稳定性评价方法，参考SUPERPAVE的指导思想按照路面水稳定性对此提出基于老挝水稳定性和高温稳定性的沥青混合料设计方法。 最后通过分析沥青路面在不同阶段产生永久变形的原因，提出新的高温评价指标和方法；针对沥青混合料高温评价体系，提出了与气温、交通量、路面结构力学状况、结构层位等相关联的混合料高温性能指标，评价指标采用沥青混合料的抗剪强度，动稳定度标准和车辙深度标准。
[Abstract]:At present, there is no unified specification for asphalt mixture design in Laos, and it is found that the diseases of Lao pavement are mainly due to water damage and rut caused by excessive rainfall and high temperature, taking into account the characteristics of humid and hot climate in Laos. The research on the performance evaluation method of asphalt mixture provides certain reference value for the design of Lao asphalt mixture and is of great significance to the construction of Lao highway. Firstly, the probability distribution of humid-thermal coefficient in Laos is analyzed, and the climate zoning map of asphalt pavement based on humid-thermal coefficient is drawn. Through the analysis of the annual rainfall in Laos, it is found that the annual rainfall is generally above 2000mm, and the asphalt pavement will be seriously damaged by the dynamic water pressure caused by the driving load. In view of the deficiency of dynamic water scour failure mechanism and evaluation method of asphalt pavement, a relatively simple dynamic water scour test is used to evaluate the water stability of asphalt mixture. CT scanning technology and infrared spectroscopy are used to test the specimen. The variation of voidage and material in asphalt mixture before and after dynamic water scour is analyzed, and the feasibility of evaluating water stability of asphalt mixture by dynamic water scouring instrument is verified. According to the dynamic water scour system, the evaluation method of asphalt pavement water stability suitable for Laos is put forward. The main internal factors affecting water stability are analyzed, and then the optimum volume parameters of different asphalt mixtures are obtained by dynamic water scour test, freeze-thaw cycle split test and static modulus test. The conventional water stability evaluation method suitable for Laos is recommended, and the asphalt mixture design method based on Lao water stability and high temperature stability is put forward according to the guiding ideology of SUPERPAVE. Finally, by analyzing the causes of permanent deformation of asphalt pavement in different stages, a new high temperature evaluation index and method is put forward. According to the high temperature evaluation system of asphalt mixture, the high temperature performance indexes related to air temperature, traffic volume, pavement structural mechanics and structural layer are put forward, and the shear strength of asphalt mixture is adopted in the evaluation index. Dynamic stability standard and rut depth standard.
【学位授予单位】：长安大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：U414
本文编号：2484714
[Abstract]:At present, there is no unified specification for asphalt mixture design in Laos, and it is found that the diseases of Lao pavement are mainly due to water damage and rut caused by excessive rainfall and high temperature, taking into account the characteristics of humid and hot climate in Laos. The research on the performance evaluation method of asphalt mixture provides certain reference value for the design of Lao asphalt mixture and is of great significance to the construction of Lao highway. Firstly, the probability distribution of humid-thermal coefficient in Laos is analyzed, and the climate zoning map of asphalt pavement based on humid-thermal coefficient is drawn. Through the analysis of the annual rainfall in Laos, it is found that the annual rainfall is generally above 2000mm, and the asphalt pavement will be seriously damaged by the dynamic water pressure caused by the driving load. In view of the deficiency of dynamic water scour failure mechanism and evaluation method of asphalt pavement, a relatively simple dynamic water scour test is used to evaluate the water stability of asphalt mixture. CT scanning technology and infrared spectroscopy are used to test the specimen. The variation of voidage and material in asphalt mixture before and after dynamic water scour is analyzed, and the feasibility of evaluating water stability of asphalt mixture by dynamic water scouring instrument is verified. According to the dynamic water scour system, the evaluation method of asphalt pavement water stability suitable for Laos is put forward. The main internal factors affecting water stability are analyzed, and then the optimum volume parameters of different asphalt mixtures are obtained by dynamic water scour test, freeze-thaw cycle split test and static modulus test. The conventional water stability evaluation method suitable for Laos is recommended, and the asphalt mixture design method based on Lao water stability and high temperature stability is put forward according to the guiding ideology of SUPERPAVE. Finally, by analyzing the causes of permanent deformation of asphalt pavement in different stages, a new high temperature evaluation index and method is put forward. According to the high temperature evaluation system of asphalt mixture, the high temperature performance indexes related to air temperature, traffic volume, pavement structural mechanics and structural layer are put forward, and the shear strength of asphalt mixture is adopted in the evaluation index. Dynamic stability standard and rut depth standard.
【学位授予单位】：长安大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：U414
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