透水型建筑固废再生水稳材料疲劳性能试验及预测模型
Experimental investigation and prediction model of fatigue performance of cement-stabilized permeable recycled aggregate materials from construction solid waste
杨涛 1肖源杰 2陈宇亮 3李昀博 1何庆宇 1周震 4李鼎硕1
作者信息
- 1. 中南大学 土木工程学院,湖南 长沙 410075
- 2. 中南大学 土木工程学院,湖南 长沙 410075;中南大学 重载铁路工程结构教育部重点实验室,湖南 长沙 410075
- 3. 湖南省交通科学研究院有限公司,湖南 长沙 410015
- 4. 广东省交通规划设计研究院集团股份有限公司,广东 广州 510440
- 折叠
摘要
为探讨建筑固体废弃物再生骨料在透水型公路水泥稳定碎石基层中的应用和耐久性强化问题,以建筑固废再生骨料部分替代天然碎石制备透水型再生水泥稳定碎石试样,开展无侧限抗压和四点弯曲疲劳试验.基于能量理论分析透水型再生水泥稳定碎石材料在疲劳加载过程中的耗散能变化规律,并建立基于耗散能的疲劳损伤预估模型,进而分析透水型建筑固废再生水稳碎石材料的疲劳损伤演化规律.研究结果表明:透水型建筑固废再生水稳碎石材料其抗压强度和渗透系数满足我国大多数公路基层的使用要求;试样累积耗散能随疲劳应力加载峰值的上升呈指数级增长,并且单次疲劳应力加卸载循环中产生的耗散能量与疲劳应力比具有较强关联,疲劳应力比为0.75和0.85的试样在每个疲劳加载循环中的耗散能相较于0.55的试样整体分别提高了50%和200%;随着试样中再生骨料占比的提升,试样在单次加载中产生的耗散能降低,试样疲劳损伤变量和疲劳损伤相对变化速率均有不同程度的增大.基于疲劳应力峰值和损伤演化规律提出的疲劳寿命预测模型可较好地预估不同疲劳应力水平下材料的疲劳寿命.研究结果可为建筑固体废弃物再生骨料在透水型公路水泥稳定碎石基层中的高效应用及长期服役性能提升提供理论依据和技术参考.
Abstract
To investigate the application and durability improvement of recycled aggregates from construction demolition wastes(CDWs)in cement-stabilized crushed stone base for permeable road.The marginal aggregates recycled from CDWs were used to partially replace natural virgin aggregates for preparing cement-stabilized permeable recycled aggregate(CPRAM)specimens.The unconfined compressive strength tests,permeability tests,and four-point bending fatigue tests were used to test the mechanical properties of CPRAM.The dissipated energy of the CPRAM specimens during the fatigue loading process was analyzed with energy theory,and the fatigue damage model was established based on the dissipated energy to analyze the fatigue damage evolution of the CPRAM specimens.The research results show that the compressive strength and coefficient of permeability of the CPRAM specimens satisfy the performance requirements specified for most types of roads in China.The cumulative dissipated energy of the specimens increases exponentially with the peak fatigue stress rises.The dissipated energy generated in a single fatigue stress loading and unloading cycle has a strong correlation with the fatigue stress ratio values,the dissipated energy of the specimens with fatigue stress ratio of 0.75 and 0.85 increases 50%and 200%,respectively,compared with that of the specimens with fatigue stress ratio of 0.55 in each fatigue.The proportion of recycled aggregate in the specimen is increased.The amount of dissipated energy generated in a single loading will be reduced.The fatigue damage variables and the relative rate of change of fatigue damage of the specimen will be shown to be different degrees of increase.The fatigue life prediction model based on the peak fatigue stress and fatigue damage evolution can predict the fatigue life of the CPRAM materials under different levels of fatigue stress reasonably well.The research results can provide a reference for further improve the engineering application and long-term safe service of recycled aggregates from CDWs in cement-stabilized crushed stone base for permeable road.
关键词
透水型基层/建筑固废/再生水泥稳定材料/疲劳损伤/疲劳寿命Key words
permeable road base/building demolition wastes/cement-stabilized recycled aggregate materials/fatigue damage/fatigue life引用本文复制引用
基金项目
国家自然科学基金资助项目(52178443)
国家重点研发计划项目(2019YFC1904704)
交通运输部重点科技项目(2022-MS5-122)
出版年
2024
国家科技期刊平台
NSTL
万方数据