摘要
为探究水工沥青混凝土面板防渗层的裂缝愈合特性,采用小梁弯曲、裂缝观测及超声无损检测手段,从力学性能、结构完整性两个维度对比分析了基准沥青混凝土和纤维沥青混凝土的裂缝愈合行为差异。试验结果表明,沥青混凝土浸水7 d后,纤维的吸附作用和弹性性能有效维持了力学性能的稳定性,纤维沥青混凝土弯曲愈合率高达95%,而基准沥青混凝土仅为41%。水环境对裂缝表面愈合具有显著促进作用,表面愈合率最高可达97%,远优于干燥环境。纤维沥青混凝土内部损伤修复具有“迟滞-强化”的愈合特性,初期愈合迟滞特点是由于纤维的吸油效应增加了结构沥青厚度,而纤维与沥青协同变形保证了优异的7 d养护期内的持续愈合能力。采用这种多指标协同的评价方法,有助于全面了解纤维增强沥青混凝土的裂缝愈合行为。
For the impervious layer in hydraulic asphalt concrete panels,this study examine its crack-healing characteristics by conducting beam bending tests,crack observation,and ultrasonic non-destructive testing on fiber-reinforced asphalt concrete.We make a comparative analysis of its crack-healing behaviors with those of the reference asphalt concrete,focusing on mechanical properties and structural integrity.Experimental results show that after seven days of a fiber concrete specimen immersed in water,its fibers'adsorption effect and elastic properties maintain the stability of its mechanical properties.Its bending healing rate reaches up to 95%,whereas the reference concrete has a rate as low as 41%.Water environment promotes surface healing significantly,with the highest rate up to 97%,far superior to that in dry conditions.For the fiber concrete,its internal damage healing is characterized with hysteresis-strengthening.The initial-stage healing hysteresis is attributed to the oil absorption effect of fibers,increasing the thickness of structural asphalt,while the synergistic deformation of fibers and asphalt ensures excellent continuous healing performance in the period of seven days.This study further achieves a multi-index collaborative evaluation method for the crack-healing performance of fiber-reinforced hydraulic concrete,and lays a basis for its engineering application.
作者
李洋
吴文博
闵永涛
郝如升
张伟
贺晶晶
LI Yang;WU Wenbo;MIN Yongtao;HAO Rusheng;ZHANG Wei;HE Jingjing(Power China Northwest Engineering Co.,Ltd.,Xi'an 710100,China)
出处
《水力发电学报》
北大核心
2025年第11期81-88,共8页
Journal of Hydroelectric Engineering
基金
陕西省创新能力支撑计划项目(2020KJXX-099)
陕西省混凝土结构安全与耐久性重点实验室开放基金(sz02403)。
关键词
水工沥青混凝土
防渗层
裂缝愈合
纤维
超声无损检测
hydraulic asphalt concrete
impermeable panel
crack healing
fiber
ultrasonic nondestructive testing
