Effects of steel fiber and strain rate on the dynamic compressive stress-strain relationship in reactive powder concrete

Abstract Three types of steel fiber-reinforced reactive powder concrete (SFRPC) with steel fiber contents of 0%, 2%, and 5% by volume are tested under dynamic compression by using a 40-mm-diameter split Hopkinson pressure bar (SHPB) apparatus. Data from SHPB experiments are employed to analyze the influence of critical parameters on the dynamic compressive stress-strain relationship of SFRPC at high strain rates. Test results show that steel fiber has a significant effect on the stress-strain relationship and energy absorption of RPC. Peak strain and peak stress increase with the increasing steel fiber content at the identical strain rates. A dynamic compressive damage-softening model for SFRPC at high strain rates is put forward on the basis of the Weibull distribution of SFRPC strength. A theoretical formula for Ed was established in order to ascertain Ed for the proposed constitutive model. The ratio of Ed to static elastic modulus Es increases with increasing strain rate and decreasing steel fiber content. The proposed constitutive model captures the dynamic compressive stress-strain relationship of SFRPC, and theoretical results are in agreement with measured data.

[1]  Zhi-Liang Wang,et al.  Stress–strain relationship of steel fiber-reinforced concrete under dynamic compression , 2008 .

[2]  Na Hyun Yi,et al.  Blast-resistant characteristics of ultra-high strength concrete and reactive powder concrete , 2012 .

[3]  Ying Wang,et al.  Compressive stress–strain relationship of steel fiber-reinforced reactive powder concrete after exposure to elevated temperatures , 2012 .

[4]  D. Krajcinovic,et al.  Introduction to continuum damage mechanics , 1986 .

[5]  U. S. Lindholm.  Some experiments with the split hopkinson pressure bar , 1964 .

[6]  Q. Yuan,et al.  Dynamic mechanical properties of cement and asphalt mortar based on SHPB test , 2014 .

[7]  A. Samer Ezeldin,et al.  Normal‐ and High‐Strength Fiber‐Reinforced Concrete under Compression , 1992 .

[8]  Wei Sun,et al.  Dynamic compression behavior of ultra-high performance cement based composites , 2010 .

[9]  Single and multiple dynamic impacts behaviour of ultra-high performance cementitious composite , 2011 .

[10]  Ying Wang,et al.  Stress–strain relationship of steel-fibre reinforced reactive powder concrete at elevated temperatures , 2015 .

[11]  Gilles Pijaudier-Cabot,et al.  CONTINUUM DAMAGE THEORY - APPLICATION TO CONCRETE , 1989 .

[12]  Y. Ju,et al.  Experimental study of dynamic mechanical properties of reactive powder concrete under high-strain-rate impacts , 2010 .

[13]  Herbert Kolsky,et al.  Stress Waves in Solids , 2003 .

[14]  Hong Hao,et al.  Experimental confirmation of some factors influencing dynamic concrete compressive strengths in high-speed impact tests , 2013 .

[15]  Wei Sun,et al.  Impact resistance of reactive powder concrete , 2015, Journal of Wuhan University of Technology-Mater. Sci. Ed..

[16]  H. Kohzu,et al.  Enhancement of energy absorption in a closed-cell aluminum by the modification of cellular structures , 1999 .

[17]  W. Weibull.  A Statistical Distribution Function of Wide Applicability , 1951 .

[18]  Ren Xing-tao.  Dynamic mechanical behavior of steel-fiber reactive powder concrete , 2011 .

[19]  S. Pyo,et al.  Crack propagation speed in ultra high performance concrete (UHPC) , 2016 .

[20]  Xiaoyan Liang,et al.  Experimental and numerical studies on dynamic compressive behavior of reactive powder concretes , 2008 .

[21]  Chengqing Wu,et al.  Effects of steel fibres on dynamic strength of UHPC , 2016 .

[22]  Jean Lemaitre,et al.  A Course on Damage Mechanics , 1992 .

[23]  S. H. Perry,et al.  Compressive behaviour of concrete at high strain rates , 1991 .