钢纤维对自密实混凝土工作性能和抗压韧性影响的试验研究

兰州理工大学学报 ›› 2024, Vol. 50 ›› Issue (5): 112-117.

钢纤维对自密实混凝土工作性能和抗压韧性影响的试验研究

韩建平^*1, 韩维丽¹, 文旭皓¹, 牛昌林², 魏宏亮²

1.兰州理工大学甘肃省土木工程防灾减灾重点实验室, 甘肃兰州 730050;
2.甘肃建投科技研发有限公司, 甘肃兰州 730050

收稿日期:2021-03-26 出版日期:2024-10-28 发布日期:2024-10-31
通讯作者: 韩建平(1970-),男,甘肃宕昌人,博士,教授.Email:jphan@lut.edu.cn
基金资助:
国家自然科学基金(52078243)

Experimental investigation on the influence of steel fiber on the workability and compressive toughness of self-compacting concrete

HAN Jian-ping¹, HAN Wei-li¹, WEN Xu-hao¹, NIU Chang-lin², WEI Hong-liang²

1. Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou Univ. of Tech., Lanzhou 730050, China;
2. Gansu Construction Investment of Science and Technology Development Co. Ltd., Lanzhou 730050, China

Received:2021-03-26 Online:2024-10-28 Published:2024-10-31

摘要/Abstract

摘要： 纤维掺量是影响钢纤维增强自密实混凝土(SFRSCC)性能的重要因素之一.为研究钢纤维掺量对SFRSCC性能的影响,设计制作6组不同纤维掺量的试块,进行工作性能和轴心受压力学性能试验.结果表明,钢纤维能够有效延缓裂缝发展,提高混凝土峰值应变,等效抗压韧性指数随纤维掺量的增加而增大.钢纤维的掺加使得新拌合混凝土流动性降低,与流变特性相关的SFRSCC形状因子λ值低于普通自密实混凝土(SCC).钢纤维的掺加对SFRSCC抗压强度的影响不大,且随着纤维掺量增加,抗压强度呈现先减小后增大的特征.

关键词: 钢纤维增强自密实混凝土, 坍落扩展度, 轴心受压, 抗压强度, 抗压韧性

Abstract: For steel fiber reinforced self-compacting concrete (SFRSCC), the fiber content is one of the important factors affecting its performance. In order to investigate the influence of the steel fiber content on the performance of SFRSCC, six sets of specimens with different proportions of steel fiber were designed and fabricated to test their workability and mechanical performance under axial compression.The results show that the addition of steel fiber effectively delays the crack development, increases the peak strain of SFRSCC. The equivalent compressive toughness index increases with the increase of fiber content. The addition of steel fiber reduces the fluidity of freshly mixed concrete, and the shape factor related to rheological behavior of SFRSCC is less than that of ordinary self-compacting concrete (SCC). The addition of steel fiber has little influence on the compressive strength of SFRSCC. With the increase of steel fiber content, the compressive strength of SFRSCC decreases first and then increases.

Key words: steel fiber reinforced self-compacting concrete (SFRSCC), slump expansion, axial compression, compressive strength, compressive toughness

中图分类号:

TU528.58

韩建平, 韩维丽, 文旭皓, 牛昌林, 魏宏亮. 钢纤维对自密实混凝土工作性能和抗压韧性影响的试验研究[J]. 兰州理工大学学报, 2024, 50(5): 112-117.

HAN Jian-ping, HAN Wei-li, WEN Xu-hao, NIU Chang-lin, WEI Hong-liang. Experimental investigation on the influence of steel fiber on the workability and compressive toughness of self-compacting concrete[J]. Journal of Lanzhou University of Technology, 2024, 50(5): 112-117.

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