考虑纹理重构的道路养护吸能封层制备调控与功能评价  

Preparation Regulation and Functional Evaluation of Road Maintenance Energy-absorbing Seal Considering Texture Reconstruction

作　　者：王朝辉[1] 陈谦[1] 李彦伟 左志武 冯雷 黄帅 WANG Chao-hui;CHEN Qian;LI Yan-wei;ZUO Zhi-wu;FENG Lei;HUANG Shuai(School of Highway,Chang'an University,Xi'an 710064,Shaanxi,China;Taihang Urban and Rural Construction Group Co.Ltd.,Shijiazhuang 050222,Hebei,China;Shandong Hi-speed Group Co.Ltd.,Jinan 250098,Shandong,China)

机构地区：[1]长安大学公路学院,陕西西安710064 [2]太行城乡建设集团有限公司,河北石家庄050222 [3]山东高速集团有限公司,山东济南250098

出　　处：《中国公路学报》2024年第10期1-13,共13页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(52378429);陕西省创新能力支撑计划项目(2022TD-07);陕西省自然科学基础研究计划项目(2024JC-YBQN-0562)。

摘　　要：为进一步开拓吸能材料在道路养护领域的全新应用,赋予预防养护封层兼顾路表功能改善与既有路面结构承载力提升的双重功效,以新型路用吸能材料为载体,“夹芯式”封层结构为框架,考虑纹理重构,设计并制备了道路养护吸能封层;采用图像处理技术和加速加载试验,分析了道路养护吸能封层表面纹理特征与路表功能的衰变规律,明确了其耐久性;借助轮碾连续加载试验,评价了道路养护吸能封层对沥青混凝土板底应变的消减效果,探明了其耐荷缓力功效;基于动态热机械分析,阐释了道路养护吸能封层微观吸能特性及阻尼行为,揭示了其缓力机理;最终为道路养护吸能封层的深入探索与推广应用奠定坚实基础。结果表明:基于封层表面纹理及耐磨、抗滑等表面功能变化规律,确定集料覆盖率为40%,2.36~4.75 mm和1.18~2.36 mm两挡集料的比例为25∶75,吸能材料洒布方案为上层1.0 kg·m^(-2)+下层2.0 kg·m^(-2);加载磨耗4万次后,道路养护吸能封层表面纹理轻微衰减,表面功能耐久性良好;道路养护吸能封层有效降低沥青混凝土板底部的纵向与横向应变,可使原始拉应变转化为压应变,或者降低原始拉/压应变数值30%~50%;吸能封层材料损耗因子[tan(δ)]维持在0.1~0.3,能够在-50℃~200℃、10^(-4)~10^(8)Hz较宽温度域与频率域中表现优异阻尼性能。The purpose of this study was to develop a new application of energy-absorbing materials in the road maintenance field and to produce a preventive maintenance seal that can improve the road surface function and enhance the structural bearing capacity of existing roads.A new road energy-absorbing material was used as the matrix,and a“sandwich”structure was used as the framework.A road maintenance energy-absorbing seal was designed and prepared,considering texture reconstruction.Image-processing analysis and accelerated loading tests were performed to analyze the decay law of the surface texture characteristics and road surface function of the road maintenance energy-absorbing seal and evaluate the durability of the seal.The effect of the road maintenance energy-absorption seal on decreasing the strain at the bottom of an asphalt concrete plate was evaluated using a continuous loading test of wheel rolling,and its load-bearing and buffering effects were investigated.Based on dynamic thermomechanical analysis,the microenergy-absorbing characteristics and damping behavior of the road maintenance energy-absorption seal were described,and its buffering mechanism was revealed.Finally,this study lays a solid foundation for the extensive investigation and promotion of the road maintenance energy-absorbing seal.The results show that the aggregate coverage rate is 40%,based on the seal surface texture and surface functions(wear resistance and sliding resistance).The ratio between the 2.36-4.75 mm and 1.18-2.36 mm aggregates is 25:75.The spraying plans for the energy-absorbing material are 1.0 and 2.0 kg·m^(-2)for the upper and lower layers,respectively.After 40000 cycles of loading and wear cycles,the surface texture of the road maintenance energy-absorbing seal attenuated slightly,and the decline in the durability of its surface was evident.A road maintenance energy-absorbing seal can effectively reduce longitudinal and transverse strains at the bottom of an asphalt concrete plate.Moreover,it can convert the original

关 键 词：路面工程 吸能封层 加速加载试验 制备 缓力 纹理 机理 

分 类 号：U414[交通运输工程—道路与铁道工程]