乳化沥青冷再生路面性能衰变与病害特征分析

发布时间：2019-02-15 07:58

【摘要】：为掌握乳化沥青冷再生路面技术状况衰变特征,选择我国南方某高速公路路面维修工程中153车道公里乳化沥青厂拌冷再生路段作为研究对象,分析了其开放交通29个月内路面损坏状况指数PCI、路面行驶质量指数RQI、路面车辙深度指数RDI、路面结构强度指数PSSI随时间和交通荷载的变化规律。结果表明,经受了775万次累计当量轴载作用后,乳化沥青冷再生路面PCI、RQI、RDI、PSSI指标均处在优的等级。乳化沥青冷再生路面技术状况指标衰变规律可以采用路面性能衰变通用方程描述,但是表征耐久性的路面寿命因子ɑ高于常规路面结构。路面最主要的病害是翻浆,其次是Top-Down裂缝。PCI、RQI指标随交通量增长的衰变规律呈明显的"快-慢"两阶段特征,在运营初期出现较快的小幅衰减后,乳化沥青冷再生路面性能在相当长的时间内保持高位稳定。PSSI在85~90和60~85范围内与PCI分别存在良好的线性相关关系,PSSI从90降至85会造成PCI的显著下降,PSSI超过90之后与PCI基本没有相关性。为保证冷再生路面性能和使用寿命,路面PSSI指标应始终保持在90以上。
[Abstract]:In order to understand the decay characteristics of emulsified asphalt cold recycled pavement, 153 lane emulsified asphalt factory cold recycled section of a highway pavement maintenance project in southern China was selected as the research object. In this paper, the pavement damage index, PCI, pavement quality index, RQI, pavement rutting depth index, RDI, pavement structural strength index, PSSI, are analyzed within 29 months of open traffic. The changes of PSSI with time and traffic load are analyzed. The results show that after 7.75 million accumulative equivalent axial loads, the PCI,RQI,RDI,PSSI index of emulsified asphalt cold recycled pavement is in the superior grade. The decay law of cold recycled asphalt pavement can be described by the general equation of pavement performance decay, but the pavement life factor which represents durability is higher than that of conventional pavement structure. The most important disease of pavement is slurry, followed by Top-Down crack. The decay law of PCI,RQI index with the increase of traffic volume shows obvious characteristics of "fast slow" two-stage, and after a relatively fast and small attenuation in the initial stage of operation, The performance of emulsified bitumen cold recycled pavement remains high and stable for quite a long time. There is a good linear correlation between PSSI and PCI in the range of 85 ~ 90 and 60 ~ 85, respectively, and the decrease of PSSI from 90 to 85 results in a significant decrease of PCI. There was no correlation between PSSI and PCI after 90 years. In order to ensure the performance and service life of cold recycled pavement, the PSSI index of pavement should always be kept above 90.
【作者单位】：交通运输部公路科学研究所道路结构与材料交通运输行业重点实验室;
【分类号】：U416.26

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