水力发电学报2025，Vol.44Issue(8)：93-104,12.DOI:10.11660/slfdxb.20250809
单轴压缩作用下纤维增强耐磨粉煤灰混凝土力学特征参数
Mechanical characteristics of fiber-reinforced abrasion-resistant fly ash concrete under uniaxial compression
摘要
Abstract
This study selects polypropylene fibers(PP)and polyacrylonitrile fibers(PAN)as reinforcing contents of high-strength wear-resistant fly ash concrete(HF concrete)to improve its brittle damage characteristics.Combining digital image correlation technology(DIC)and ultrasonic detection(UT),we conduct experimental tests and examine the stress-strain characteristic parameters of this fiber-reinforced HF concrete under the condition of compression damage.The results show its damage and failure process can be divided into five stages-elasticity,plasticity,sudden damage,accelerated damage,and residual damage.PP inhibits the initiation of microcracks in elastoplastic stage,and PAN inhibits the propagation of microcracks in abrupt damage stage.With a PP content of 0.6 kg/m³ and PAN of 0.6 kg/m³,the concrete enjoys the best hybrid effect and a peak stress increase of 8.35%or 4.47%in comparison with that of the single PP or PAN respectively,and it manifests an increase of 23.74%or 9.87%respectively in its compressive toughness index.Finally,a stress-strain full curve model is developed for such fiber-reinforced HF concrete based on the CEB-FIP model and Guo Zhenhai model,and it is optimized using an improved differential evolution algorithm.It gives optimized stress-strain full curves in good agreement with the experimental curves.Our findings help engineering application of fiber-reinforced HF concrete and lay a basis for follow-up research.关键词
HF混凝土/纤维增韧/数字图像相关(DIC)/超声波检测/应力-应变/损伤演变Key words
HF concrete/fiber toughening/digital image correlation(DIC)/ultrasonic detection/stress-strain/damage evolution分类
建筑与水利引用本文复制引用
覃源,袁旭东,吴江江,赵映铖,赵靖伟,段明翰..单轴压缩作用下纤维增强耐磨粉煤灰混凝土力学特征参数[J].水力发电学报,2025,44(8):93-104,12.基金项目
国家自然科学基金项目(52279139) （52279139）
