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陆进保

 

(乌鲁木齐职业大学 智能制造学院 , 乌鲁木齐   830002)

摘  要: 为了进一步提高混凝土的弯曲韧性 , 以粉煤灰 、聚丙烯纤维 、玄武岩纤维和钢纤维为研究对象 ,以混凝土的抗弯强度和韧性指数为评价指标 , 开展了粉煤灰以及混杂纤维对混凝土弯曲韧性的影响研究 。结果表明 : 单独掺入粉煤灰时对混凝土弯曲韧性的影响相对较小 , 当粉煤灰的掺量为 20%时 , 混凝土的抗弯强度和韧性指数均可达最大值 。单独掺入聚丙烯纤维 、玄武岩纤维和钢纤维时 , 混凝土的弯曲韧性均可得到不同程度的改善 , 其中钢纤维对混凝土弯曲韧性的改善效果最好 。混杂纤维的掺入对混凝土弯曲韧性的提升效果更好 ,其中将钢纤维和玄武岩纤维混合掺入混凝土时 , 可显著提升混凝土的抗弯强度和韧性指数 , 当钢-玄武岩混杂纤维的掺量为 1. 2% 时 , 混凝土的抗弯强度为 11. 08 MPa, 韧性指数 I5 、I10  和 I20  分别可以达到 8. 01、12. 15、 15. 87, 相对于空白混凝土而言 , 抗弯强度提升了 73. 67% , 韧性指数 I5 、I10 和 I20 分别提升了 71. 15%、67. 36%、 48. 46% , 混凝土的弯曲韧性得到了明显的改善 。研究结果认为粉煤灰及混杂纤维联合使用可发挥良好的协同增效作用 , 使混凝土的弯曲韧性得到较大幅度的提升。

关键词: 混凝土 ; 粉煤灰 ; 混杂纤维 ; 弯曲韧性 ; 掺量 ; 抗弯强度

中图分类号: TU528      文献标志码: A      文章编号: 1005-8249 (2026) 04-0031-06

DOI:10. 19860/j. cnki. issn1005-8249. 2026. 04. 005

 

Study on the Influence of Fly Ash and Mixed Fibers on the Flexural Toughness of Concrete

LU Jinbao

(College of Intelligent Manufacturing, Urumqi Vocational University, Urumqi 830002, China)

Abstract : In order to further improve the flexural toughness of concrete, a study was conducted on the effects of fly ash, polypropylene fiber, basalt fiber, and steel fiber on the flexural toughness of concrete, with the flexural strength and toughness index of concrete as evaluation indicators. The results show that the effect of adding fly ash alone on the flexural toughness of concrete is relatively small. When the fly ash content is 20% , the flexural strength and toughness index of concrete can reach their maximum values. When polypropylene fiber, basalt fiber, and steel fiber are separately added, the flexural toughness of concrete can be improved to varying degrees, with steel fiber having the best effect on improving the flexural toughness of concrete. The addition of hybrid fibers has a better effect on improving the flexural toughness of concrete. When steel fibers and basalt fibers are mixed into concrete, the flexural strength and toughness index of concrete can be significantly improved. When the content of steel basalt hybrid fibers is 1. 2% , the flexural strength of concrete is 11. 08 MPa, and the toughness indices I5 、 I10 and I20 can reach 8. 01, 12. 15, and 15. 87,respectively. Compared with blank concrete, the flexural strength is increased by 73. 67% , and the toughness indices I5 、I10 and I20 are increased by 71. 67% , respectively. 15% , 67. 36% , and 48. 46% showed significant improvement in the flexural toughness of concrete. The research findings suggest that the combined use of fly ash and hybrid fibers can achieve a synergistic effect, significantly enhancing the flexural toughness of concrete.

Key words: concrete; fly ash; mixed fibers; bending toughness; dosage; flexural strength