Experimental study on tensile behavior of cement paste, mortar and concrete under high strain rates

Abstract

Effects of the strain rate on cement paste, mortar and concrete were studied. A modified SHPB testing technique with flattened Brazilian disc (FBD) specimen was developed to measure the dynamic tensile stress-strain curve of materials. A pulse-shaped split Hopkinson pressure bar (SHPB) was employed to determine the dynamic tensile mechanical responses and failure behavior of materials under valid dynamic testing conditions. Quasi-static experiments were conducted to study material strain rate sensitivity. Strain rate sensitivity of the materials was measured in terms of the stress-strain curve, elastic modulus, tensile strength and critical strain at peak stress. Empirical relations between dynamic increase factor (DIF) and the material properties were derived and presented.

Keywords

tensile behavior / cement-based materials / experimental study / split Hopkinson pressure bar

References

[1] Tabatabaei ZS, Volz JS, Baird J, et al. Experimental and Numerical Analyses of Long Carbon Fiber Reinforced Concrete Panels Exposed to Blast Loading [J]. Int. J. Impact Eng., 2013, 57(7): 70-80.

[2] Lambert DE, Ross CA. Strain Rate Effects on Dynamic Fracture and Strength[J]. Int. J. Impact Eng., 2000, 24(10): 985-998.

[3] Ross CA, Thompson PY, Tedesco JW. Split-Hopkinson Pressure-Bar Tests on Concrete and Mortar in Tension and Compression[J]. ACI Mater. J., 1989, 86(5): 475-481.

[4] Zhou J, Chen X, Wu L, et al. Influence of Free Water Content on the Compressive Mechanical Behavior of Cement Mortar under High Strain Rate[J]. Sadhana: Acad. P. Eng. Sci., 2011, 36(3): 357-369.

[5] Zheng W K A L PKK. Direct Tension Test of Concrete[J]. ACI Mater. J., 2001, 98(1): 63-71.

[6] Mesbah A, Morel J, Walker P, et al. Development of a Direct Tensile Test for Compacted Earth Blocks Reinforced with Natural Fibers[J]. J. Mater. Civ. Eng., 2004, 16(1): 95-98.

[7] Rocco C, Guinea GV, Planas J, et al. Size Effect and Boundary Conditions in the Brazilian Test: Theoretical Analysis[J]. Mater. Struct., 1999, 32(6): 437-444.

[8] Wu S, Chen X, Zhou J. Influence of Strain Rate and Water Content on Mechanical Behavior of Dam Concrete[J]. Constr. Build. Mater., 2012, 36(11): 448-457.

[9] Lok T, Xiao JR. Flexural Strength Assessment of Steel Fiber Reinforced Concrete[J]. J. Mater. Civ. Eng., 1999, 11(3): 188-196.

[10] Ruiz G, Ortiz M, Pandolfi A. Three-dimensional Finite-Element Simulation of the Dynamic Brazilian Tests on Concrete Cylinders[J]. Int. J. Numer. Mech. Eng., 2000, 48: 963-994.

[11] Grantham SG, Siviour CR, Proud WG, et al. High-strain Rate Brazilian Testing of an Explosive Simulant Using Speckle Metrology[J]. Meas. Sci. Technol., 2004, 15(9): 1867-1870.

[12] Wang QZ, Li W, Xie HP. Dynamic Split Tensile Test of Flattened Brazilian Disc of Rock with SHPB Setup[J]. Mech. Mater., 2009, 41(3): 252-260.

[13] Saksala T, Hokka M, Kuokkala VT, et al. Numerical Modeling and Experimentation of Dynamic Brazilian Disc Test on Kuru Granite[J]. Int. J. Rock Mech. Min. Sci., 2013, 59(4): 128-138.

[14] Zhang QB, Zhao J. Determination of Mechanical Properties and Fullfield Strain Measurements of Rock Material under Dynamic Loads[J]. Int. J. Rock Mech. Min. Sci., 2013, 60(6): 423-439.

[15] Wang QZ, Jia XM, Kou SQ, et al. The Flattened Brazilian Disc Specimen Used for Testing Elastic Modulus, Tensile Strength and Fracture Toughness of Brittle Rocks: Analytical and Numerical Results[J]. Int. J. Rock. Mech. Min. Sci., 2004, 41(2): 245-253.

[16] Xiao Y, Shan J, Zheng Q, et al. Experimental Studies on Concrete Filled Steel Tubes under High Strain Rate Loading[J]. J. Mater. Civ. Eng., 2009, 21(10): 569-577.

[17] Zhu D, Mobasher B, Rajan S. Dynamic Tensile Testing of Kevlar 49 Fabrics[J]. J. Mater. Civ. Eng., 2011, 23(3): 230-239.

[18] Frew DJ, Forrestal MJ, Chen W. A Split Hopkinson Pressure Bar Technique to Determine Compressive Stress-Strain Data for Rock Materials[J]. Exp. Mech., 2001, 41(1): 40-46.

[19] Frew DJ, Forrestal MJ, Chen W. Pulse Shaping Techniques for Testing Brittle Materials with a Split Hopkinson Pressure Bar[J]. Exp. Mech., 2002, 42(1): 93-106.

[20] Lu YB, Li QM. Appraisal of Pulse-Shaping Technique in Split Hopkinson Pressure Bar Tests for Brittle Materials[J]. Int. J. Prot. Struct., 2010, 1(3): 363-390.

[21] Li QM, Meng H. About the Dynamic Strength Enhancement of Concrete-Like Materials in a SHPB[J]. Int. J. Solids Struct., 2003, 40(2): 343-360.

[22] Bischoff PH, Perry SH. Compressive Behavior of Concrete at High Strain-rates[J]. Mater. Struct., 1991, 24(6): 425-450.

[23] Lu YB, Li QM. About the Dynamic Uniaxial Tensile Strength of Concrete-Like Materials[J]. Int. J. Impact Eng., 2010, 38(4): 171-180.

[24] Lai J, Sun W. Dynamic Behavior of Visco-elastic Damage Model of Ultra-High Performance Cementitious Composites[J]. Cem. Concr. Res., 2009, 39(11): 1044-1051.