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Frontiers of Structural and Civil Engineering

Front Arch Civil Eng Chin    2009, Vol. 3 Issue (2) : 131-136
Behavior of steel fiber–reinforced high-strength concrete at medium strain rate
Chujie JIAO1(), Wei SUN2, Shi HUAN3, Guoping JIANG3
1. School of Civil engineering, Guangzhou University, Guangzhou 510006, China; 2. School of Materials Science and Engineering, Southeast University, Nanjing 211189, China; 3. Earthquake Engineering Research Test Center, Guangzhou University, Guangzhou 510405, China
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Impact compression experiments for the steel fiber–reinforced high-strength concrete (SFRHSC) at medium strain rate were conducted using the split Hopkinson press bar (SHPB) testing method. The volume fractions of steel fibers of SFRHSC were between 0 and 3%. The experimental results showed that, when the strain rate increased from threshold value to 90 s-1, the maximum stress of SFRHSC increased about 30%, the elastic modulus of SFRHSC increased about 50%, and the increase in the peak strain of SFRHSC was 2-3 times of that in the matrix specimen. The strength and toughness of the matrix were improved remarkably because of the superposition effect of the aggregate high-strength matrix and steel fiber high-strength matrix. As a result, under impact loading, cracks developed in the SFRHSC specimen, but the overall shape of the specimen remained virtually unchanged. However, under similar impact loading, the matrix specimens were almost broken into small pieces.

Keywords steel fiber–reinforced high-strength concrete (SFRHSC)      high strain rates      split Hopkinson press bar (SHPB)      strain rate hardening effects     
Corresponding Author(s): JIAO Chujie,   
Issue Date: 05 June 2009
 Cite this article:   
Chujie JIAO,Wei SUN,Shi HUAN, et al. Behavior of steel fiber–reinforced high-strength concrete at medium strain rate[J]. Front Arch Civil Eng Chin, 2009, 3(2): 131-136.
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Articles by authors
Chujie JIAO
Guoping JIANG
water-binder ratio0.240.240.24
portland cement /(kg/m3)425435440
fly ash /(kg/m3)434444
silica fume /(kg/m3)646667
steel fiber /(kg/m3)0156234
fine aggregate /(kg/m3)616807880
coarse aggregate /(kg/m3)1252988879
water-reducing admixture /(kg/m3)9.9210.1910.31
water /(kg/m3)128132134
static compressive strength in 28 days /MPa118.2138.2154.3
Tab.1  Mixture proportions and strengths
Fig.1  Cross sections of specimens before experiment. (a) C100V; (b) C100V; (c) C100V
Fig.2  Schematic of SHPB
Fig.3  Stress-strain curves of three series of concrete. (a) C100V; (b) C100V; (c) C100V
Fig.4  Three series of concrete specimens after failure at a strain rate of about 70 s. (a) C100V; (b) C100V; (c) C100V
strain rate/ s-1compressive strength/MPapeak strain/×10-3
Tab.2  Dynamical mechanic performance of three series of concrete
Fig.5  Strength-strain rate relation of three series of concrete
Fig.6  Area enclosed by stress-strain curves of three series of concrete
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