河南科技大学学报（自然科学版）2024，Vol.45Issue(2)：21-29,9.DOI:10.15926/j.cnki.issn1672-6871.2024.02.004
不同纤维对高强轻骨料混凝土力学性能影响及微观机理研究
Effect of Different Fibers on Mechanical Properties of High-strength Lightweight Aggregate Concrete and Its Micro-Mechanism Research
摘要
Abstract
To improve the mechanical properties and flexural toughness of high-strength lightweight aggregate concrete,the effects of basalt fiber,fine polyvinyl alcohol fiber,imitation steel fiber,polypropylene fiber and coarse polyvinyl alcohol fiber on the compressive strength,splitting tensile strength and flexural strength of high-strength lightweight aggregate concrete were studied.The load-deflection curve was obtained by four-point bending test,and the effects of five kinds of fibers on the flexural toughness of high-strength lightweight aggregate concrete were compared and analyzed based on the toughness index.The surface morphology of the fibers before and after damage was observed by scanning electron microscopy,and the strengthening and toughening mechanisms of different fibers were explained.The results show that the incorporation of fibers improves the mechanical properties of high-strength lightweight aggregate concrete,mainly improving the tensile properties and flexural toughness of high-strength lightweight aggregate concrete.The coarse polyvinyl alcohol fiber improves the splitting tensile strength and bending strength by 83%and 220%respectively,which makes the failure of high strength lightweight aggregate concrete change from brittleness to high ductility.The improvement of fiber on the tensile properties and toughness of high strength lightweight aggregate concrete is proportional to the degree of fiber surface damage.关键词
高强轻骨料混凝土/纤维/力学性能/弯曲韧性Key words
high-strength lightweight aggregate/fiber/mechanical properties/flexural toughness分类
建筑与水利引用本文复制引用
张伟,李晓兵,王世合,张春晓..不同纤维对高强轻骨料混凝土力学性能影响及微观机理研究[J].河南科技大学学报（自然科学版）,2024,45(2):21-29,9.基金项目
国家自然科学基金项目(U21A20149) （U21A20149）
