硅酸盐通报2025，Vol.44Issue(12)：4359-4367,9.DOI:10.16552/j.cnki.issn1001-1625.2025.0562
纤维定向分布对UHPC弯曲性能的影响
Effect of Fiber Orientation Distribution on Flexural Properties of UHPC
ZOU Hua 1LI Shuichang 1LAO Jiakun 1LIU Ping2
作者信息
- 1. Hunan Highway Design and Research Institute Co.,Ltd.,Changsha 410026,China
- 2. School of Continuing Education,Changsha University of Science and Technology,Changsha 410114,China
- 折叠
摘要
Abstract
To investigate the influence of steel fiber orientation on the flexural performance of ultra-high performance concrete(UHPC),an electromagnetic coil was developed to generate a uniform magnetic field,and the characteristics of its internal field distribution were analyzed.Directional steel fiber UHPC was prepared using magnetic field-induced alignment.The fiber orientation was quantitatively evaluated using CT scanning and 3D image reconstruction.Four-point bending tests were conducted on UHPC with different fiber volume fractions(0％,0.5％,1.0％,1.5％and 2.0％)and fiber lengths(10,13,16 and 20 mm)for fiber orientation distribution and randomly distribution.Additionally,the effects of different parameters on load-deflection behavior,flexural strength,and toughness were investigated.The results indicate that after magnetic field induction,the fibers are predominantly aligned along the target direction,achieving a fiber orientation coefficient of up to 0.882 or greater.The flexural strength and toughness of directional steel fiber UHPC increase by 68.6％～125.7％and 68.2％～325.1％,respectively.The optimal strengthening effect is observed at a fiber length of 13 mm and a volume fraction of 1.5％.Compared with randomly distribution fiber UHPC,under equivalent flexural strength,the fiber content in directional steel fiber UHPC is reduced by more than 50％.关键词
UHPC/定向钢纤维/弯曲强度/弯曲韧性/磁场/取向系数Key words
UHPC/directional steel fiber/flexural strength/flexural toughness/magnetic field/orientation coefficient分类
化学化工引用本文复制引用
ZOU Hua,LI Shuichang,LAO Jiakun,LIU Ping..纤维定向分布对UHPC弯曲性能的影响[J].硅酸盐通报,2025,44(12):4359-4367,9.
