中南大学学报（自然科学版）2025，Vol.56Issue(4)：1426-1439,14.DOI:10.11817/j.issn.1672-7207.2025.04.015
建筑固废再生骨料水稳混合料疲劳试验与近场动力学模拟
Fatigue test and peridynamic simulation of cement-treated recycled aggregate mixture derived from building demolition waste
摘要
Abstract
The high-value reuse of recycled aggregates from construction and demolition waste has emerged as an important technological imperative for the construction of permeable road bases.However,the mechanisms of the fatigue crack generation and accumulation of micro damage to internal structure in cement-treated recycled aggregate materials(CRAM)remain unclear.Hence,it is necessary to analyze of the fatigue cracking behavior of CRAM and to explore the correlation mechanism between their internal microstructural characteristics and the macroscopic progression of fatigue damage.A damage mechanics model based on peridynamic theory was established accounting for the microstructural characteristics of CRAM.The fatigue damage mechanisms of these mixtures from meso-scale were revealed and the effects of recycled aggregate content and stress levels were explored.The results show that the peridynamic fatigue model is capable of accurately capturing the complete damage evolution process in CRAM.Notably,the stress concentration located at the interface between the aggregate and the cement matrix serving as the principal factor in the initiation and propagation of fatigue cracks.As the recycled aggregate content increases,the occurrence of fatigue cracks in dense cement-treated mixtures rises,with cracks exhibiting a straight morphology.Unlike dense cement-treated mixtures,the internal fatigue cracks in permeable cement-treated mixtures are influenced by stress concentration at the pore edges,resulting in fewer fatigue cracks.Their fatigue life exhibits a pronounced semi-logarithmic linear relationship with the stress ratio coefficient.Based on this finding,the derived fatigue equation can further predict the fatigue life of permeable cement-treated mixtures with varying recycled aggregate content at different stress levels,providing a theoretical foundation for the material optimization design of construction waste recycled cement-treated mixtures.关键词
建筑拆除固废/再生骨料水稳材料/疲劳损伤/数值模拟/近场动力学Key words
building demolition waste(BDW)/cement-treated recycled aggregate material/fatigue damage/numerical simulation/peridynamics分类
建筑与水利引用本文复制引用
侯可,华文俊,肖源杰,王小明,杨涛,陈宇亮,陶泓凯..建筑固废再生骨料水稳混合料疲劳试验与近场动力学模拟[J].中南大学学报（自然科学版）,2025,56(4):1426-1439,14.基金项目
国家自然科学基金资助项目(52178443) （52178443）
湖南省自然科学基金杰出青年基金资助项目(2024JJ2073) （2024JJ2073）
国家重点研发计划项目(2023YFC3807205,2019YFC1904704) （2023YFC3807205,2019YFC1904704）
武汉理工大学硅酸盐建筑材料国家重点实验室开放基金资助项目(SYSJJ2022-04)(Project(52178443)supported by the National Natural Science Foundation of China （SYSJJ2022-04）
Project(2024JJ2073)supported by the Science Fund for Distinguished Young Scholars of Hunan Province （2024JJ2073）
Projects(2023YFC3807205,2019YFC1904704)supported by the National Key R&D Program of China （2023YFC3807205,2019YFC1904704）
Project(SYSJJ2022-04)supported by the Open Fund of State Key Laboratory of Silicate Building Materials,Wuhan University of Technology) （SYSJJ2022-04）
