个人信息Personal Information
教授
博士生导师
硕士生导师
性别:男
毕业院校:武汉理工大学
学位:博士
所在单位:土木工程系
学科:材料学. 结构工程
联系方式:mlchang@dlut.edu.cn
电子邮箱:mlchang@dlut.edu.cn
Effect of hybrid steel fibers on the mechanical performances and microstructure of sulphoaluminate cement-based reactive powder concrete
点击次数:
论文类型:期刊论文
发表时间:2021-01-10
发表刊物:CONSTRUCTION AND BUILDING MATERIALS
卷号:261
ISSN号:0950-0618
关键字:Sulphoaluminate cement-based reactive; powder concrete; Hybrid steel fibers; Mechanical properties; Microstructure
摘要:This paper investigated a novel reactive powder concrete (RPC) with high strength and toughness, namely hybrid steel fibers reinforced sulphoaluminate cement-based reactive powder concrete (HSRSRPC). In this study, different contents of MSF (macro steel fiber) and mSF (micro steel fiber) were used for HSRSRPC. The mechanical behaviors of HSRSRPC were studied, including strength, load-deflection curves, strength ratio, toughness index, and cracking behavior. Results indicated that the compressive strength and flexural strength of HSRSRPC were effectively improved with an increase of the content of steel fibers; meanwhile, the flexural toughness highly increased owing to the synergistic effect of hybrid MSF and mSF. The microstructure of specimens was analyzed using XRD, TG-DTG and FE-SEM, and the result shows that the addition of mSF accelerated the hydration process of matrix. Furthermore, the reinforcing mechanism of HSRSRPC was revealed, i.e., AFt, C-S-H, and AH(3), as three hydration products exhibiting fibrillar morphology with different sizes, were formed a lot with mSF supply, and contributed largely to the nanostructure and microstructure of matrix; and MSF and mSF, owing to their own characteristics (including the anchoring, interface and bridging effect), made the major contribution to the microstructure and macrostructure. (C) 2020 Elsevier Ltd. All rights reserved.