摘要
沥青路面层间结合失效的位置易发生剪切滑移和水损害,层间处治技术的研究有利于保障路面结构具有良好的耐久性。为了研究合理的长寿命路面层间结合处治措施,结合实际工程中长寿命路面结构和材料设计,采用了橡胶沥青、碎石、玻璃纤维、不黏轮乳化沥青等材料。由于层间受力和材料特性的不同,针对不同的路面层间分别设计了30种层间处治方案,进而铺筑试验路,通过钻芯取样获得层间试件。设计了适用于路面芯样测试的直剪试验和应力消散试验,分别选取了黏结强度和应力消散能作为层间黏结性能的评价指标。结果表明:分别针对上-中面层层间橡胶沥青掺加碎石和玻璃纤维的层间处治方案和中-下面层层间所选的不黏轮乳化沥青层间处治方案均可获得较优的层间黏结性能,其中碎石的粒径和用量对层间黏结性能产生影响,且存在最优的范围,温度的升高会显著降低层间黏结性能,说明夏季路面层间易发生破坏。通过加入泥、砂、水等杂质研究了恶劣施工条件的影响,发现水对层间黏结性能的影响最大,因此需要尽量避免在雨天施工或采取一定的防治措施。通过应力消散试验得到的应力消散能指标与直剪试验的黏结强度指标的相关性较高,说明了应力消散试验可以作为层间黏结性能测试的一种试验方法。
Asphalt pavements are prone to shear slip and water damage at the location of interlayer bond failure, the study of interlayer treatment technology is beneficial to ensure the durability of pavement structure. To investigate the reasonable interlayer bond treatment measures for perpetual pavements, combining with the long-life pavement structure and material design in the actual projects, the materials such as rubberized asphalt, crushed stone, glass fiber, and non-stick wheel emulsified asphalt are used. Due to different interlayer forces and material properties, 30 treatment solutions for different pavement interlayers are designed. Then, a test road is paved, and interlayer specimens are obtained by drilling core samples. The direct shear test and stress dissipation test are designed for the testing of pavement core samples, and the adhesion strength and stress dissipation energy are selected as the evaluation indicators of interlayer adhesion performance. The result shows that the interlayer treatment schemes of non-stick wheel emulsified asphalt and rubber asphalt mixed with crushed stone and glass fiber for the upper-middle surface interlayer and the middle-lower layer interlayer respectively can obtain better interlayer bonding performance. Among them, the particle size and amount of crushed stone have influence on the interlayer bonding performance, and there is an optimal range. The increase of temperature will significantly reduce the interlayer bonding performance, indicating that the interlayer is prone to damage in summer. The influence of adverse construction conditions is investigated by adding impurities such as mud, sand and water. It is found that water has the greatest influence on the interlayer bonding performance, so it is necessary to avoid construction in rainy days or take certain preventive measures. The stress dissipation energy obtained from the stress dissipation test correlates well with the bond strength obtained from the direct shear test, indicating that the stress dissipation test can be used as a test method for testing interlayer bonding performance.
作者
石长洪
郑俞
严二虎
杨毅
刘军海
SHI Chang-hong;ZHENG Yu;YAN Er-hu;YANG Yi;LIU Jun-hai(CCCC Second Highway Engineering Co.,Ltd.,Xi’an Shaanxi 710061,China;Research Institute of Highway,Ministry of Transport,Beijing 100088,China;Hefei Mingchao Expressway Co.,Ltd.,Hefei Anhui 231699,China)
出处
《公路交通科技》
CAS
CSCD
北大核心
2022年第7期30-39,共10页
Journal of Highway and Transportation Research and Development
关键词
道路工程
长寿命路面
层间处治方案
层间黏结性能
应力消散性能
road engineering
perpetual pavement
interlayer treatment scheme
interlayer bonding performance
stress dissipation performance
