Effect of Contents, Tensile Strengths and Aspect Ratios of Hooked-End Steel Fibers (SFs) on Compressive and Flexural Performance of Normal Strength Concrete

International Journal of Concrete Structures and Materials

Research

Seok-Joon Jang¹  Dong-Hui Kim²  Woo-Jin Jeong²  Qi Wang²  Ai-Hua Jin²  Hyun-Do Yun²  Sun-Woo Kim³  Wan-Shin Park³ 

[1] Building Management Support Center, Korea Authority of Land & Infrastructure, 52856, Jinju, Republic of Korea;Department of Architectural Engineering, Chungnam National University, 34134, Daejeon, Republic of Korea;Department of Construction Engineering Education, Chungnam National University, 34134, Daejeon, Republic of Korea;

关键词: Steel fiber reinforced concrete (SFRC);    Compressive behavior;    Flexural behavior;    Toughness;    Residual flexural strength;   

DOI  :  10.1186/s40069-023-00611-6

 received in 2022-12-07, accepted in 2023-05-03,  发布年份 2023

来源: Springer

【 摘 要 】

This study is a part of the study to simplify the reinforcing details of reinforced concrete (RC) structural members by substituting the conventional reinforcement with hooked-end steel fibers (SFs). This paper investigates the effects of SF strength, dosage and aspect (l/d) ratio on the compressive and flexural behaviors of normal strength concrete with specified compressive strength of 30 MPa. In this study, hooked-end SFs of high strength (2000–2400 MPa) and normal strength (1100–1200 MPa) were used with three l/d ratios of 64, 67 and 80. Hooked-end SFs were incorporated with three dosages of 20 kg/m3 (0.25 vol.%), 40 kg/m3 (0.50 vol.%) and 60 kg/m3 (0.75 vol.%). Eighteen steel fiber reinforced concrete (SFRC) mixes were mixed. To evaluate the compressive and flexural performance of each SFRC mixture, three SFRC cylindrical and prismatic specimens for each mixture were manufactured and tested, respectively. The test results that the inclusion of hooked-end SFs had little effect on the compressive strength, while it improved the toughness of concrete. Hooked-end SFs were also found to be effective in enhancing the flexural performance of concrete. The dosage and properties (strength and l/d ratio) of SFs significantly affect the residual flexural tensile strength (fR1 and fR3) at serviceability (SLS) and ultimate limit state (ULS) defined in fib Model Code 2010 (MC2010).

【 授权许可】

CC BY   
© The Author(s) 2023

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