哈尔滨工程大学学报2025，Vol.46Issue(12)：2506-2513,8.DOI:10.11990/jheu.202403037
混杂纤维超高性能混凝土弯曲韧性与抗冲击性能
Flexural toughness and impact behavior of hybrid fibers reinforced ultra-high performance concrete
摘要
Abstract
To study the effect of hybrid fibers on the flexural toughness and impact toughness of ultra-high perform-ance concrete(UHPC),four-point bending and drop hammer impact tests were conducted to investigate the dam-age process,failure modes,load-deflection curves,and impact energy of specimens reinforced with steel fibers combined with three types of non-metallic fibers.The analysis includes peak load,flexural toughness,impact re-sistance capacity,and impact ductility of hybrid fiber-reinforced UHPC beams.The experimental results indicate that,at the same volume fraction,the crack resistance and toughening effects of hybrid fibers are superior to those obtained with single steel fibers.The combination of steel fibers with non-metallic fibers enhances the toughness and impact resistance of UHPC specimens.When 1%steel fibers by volume are mixed with 0.5%basalt fibers,glass fibers,or polyoxymethylene fibers,the impact ductility ratio is 2.06～2.29 greater than that of specimens with 1.5%single steel fibers.At a total fiber volume fraction of 2.0%,the impact ductility ratio of hybrid fiber speci-mens is 1.68～1.96 times greater than that of single steel fiber specimens.By introducing the impact energy ratio and ductility ratio to evaluate the impact performance of hybrid fiber-reinforced UHPC,the study provides a refer-ence for future engineering applications of UHPC.关键词
超高性能混凝土/混杂纤维/弯曲韧性/抗冲击性能/钢纤维/玄武岩纤维/聚甲醛纤维/玻璃纤维Key words
ultra-high performance concrete/hybrid fibers/flexural toughness/impact behavior/steel fiber/basalt fiber/polyoxymethylene fiber/glass fiber分类
建筑与水利引用本文复制引用
邓宗才,李华春,黄松..混杂纤维超高性能混凝土弯曲韧性与抗冲击性能[J].哈尔滨工程大学学报,2025,46(12):2506-2513,8.基金项目
北京市教委重点项目(KZ201810005008). （KZ201810005008）
