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  

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

作　　者：韩建平[1] 韩维丽 文旭皓 牛昌林 魏宏亮 HAN Jian-ping;HAN Wei-li;WEN Xu-hao;NIU Chang-lin;WEI Hong-liang(Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province,Lanzhou Univ.of Tech.,Lanzhou 730050,China;Gansu Construction Investment of Science and Technology Development Co.Ltd.,Lanzhou 730050,China)

机构地区：[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

出　　处：《兰州理工大学学报》2024年第5期112-117,共6页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(52078243)。

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.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.

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 

分 类 号：TU528.58[建筑科学—建筑技术科学]