摘要
以高轻度骨料混凝土为基础,通过引入不同体积比(0%,1%,2%和3%(体积分数))的钢纤维对混凝土进行改性研究,通过对流动性、抗压抗折、冲击压缩等性能分析,研究了钢纤维掺量对混凝土基体的影响。结果表明,钢纤维掺入后,高强混凝土的流动度逐渐降低,从198 mm降至144 mm;随着钢纤维含量的增加,高强混凝土的抗压强度和抗折强度均逐渐升高,在钢纤维含量为3%时,抗压强度和抗折强度达到最大值,整体强度上升趋势呈现出前期强度增幅快,后期增幅慢的特点;SEM分析发现,钢纤维的直径约为200μm,表面无凹坑,比较光滑,钢纤维和浆体的结合比较紧密,没有产生空槽断面;对高强混凝土冲击压缩应力-应变分析发现,未掺杂钢纤维的基体冲击压缩性能最差,随着钢纤维含量的增加,冲击压缩性能得到了明显改善,整体表现出钢纤维掺量越多,冲击压缩性能越好。
Based on high-light-weight aggregate concrete,by in troducing steel fiber with different volume ratios(0,1 vol%,2 vol%,3 vol%)to modify the concrete,the influence of the amount of steel fiber on the concrete matrix is researched through the mechanical properties,fluidity,resistance compressive and flexural performance analysis.The results show that the fluidity of high strength concrete decreases with the introduction of steel fiber,from 198 mm to 144 mm,and with the increasing of steel fiber content,the compressive strength and flexural strength of high strength concrete increase gradually.When the steel fiber content is 3 vol%,the compressive strength and flexural strength reach the maximum.The rising trend of the overall strength shows the characteristics of fast growth in the early stage and slow growth in the later stage.SEM analysis shows that the diameter of steel fiber is about 200μm,the surface is smoother without pits,the combination of steel fiber and paste is relatively tight,and no hollow section is produced.The stress-strain analysis of high-strength concrete under impact compression shows that the impact compression performance of matrix without steel fiber is the worst.With the increasing of steel fiber content,the impact compression performance has been significantly improved.The overall performance is that the more steel fiber content,the better impact compression performance.
作者
任大鹏
于吉鲲
方迪
REN Dapeng;YU Jikun;FANG Di(Applied Technology College, Dalian Ocean University, Dalian 116300, China)
出处
《功能材料》
CAS
CSCD
北大核心
2021年第11期11132-11136,共5页
Journal of Functional Materials
基金
辽宁省教育厅2020年度科学研究经费资助项目(QL202017)。
关键词
钢纤维
高强混凝土
力学性能
流动度
冲击压缩性能
steel fiber
high-strength concrete
mechanical properties
fluidity
impact compression performance
