Flexural Behavior of High Performance Cementitious Composites Reinforced With Hooked Steel Fibers

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Abstract

This research investigates the mechanical properties of High Performance Fiber Reinforced Cementitious Composites (HPFRCC) with two volume fractions of fiber (1% and 2%). Hooked steel fibers were incorporated into a mortar matrix with 49 MPa compressive strength. Four point bending tests were carried out according to ASTM C1018 and ASTM C1609 Standards. Parameters such as: load carrying capacity (equivalent bending strength), energy absorption capacity (toughness) , deflection, and cracking patterns (number of cracks), were evaluated to investigate the flexural behavior of two HPFRCCs. It was found that the increase in fiber volume fraction not only promotes the flexural behavior from deflection softening to deflection hardening, but also improves all mechanical properties. Deflection capacity gains the most from deflection hardening behavior. Besides, substantial increase in load carrying capacity and energy absorption is also achieved. It was observed that HPFRCC with deflection hardening behavior exhibits multiple cracking in the post cracking behavior.

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[1] Naaman AE )2002) Toughness, ductility surface energy and deflection-hardening FRC composites. In: Proceedings of JCI workshop on ductile fiber reinforced cementitious composites (DFRCC) – application and evaluation, Japan Concrete Institute, Tokyo, Japan, 33–57.
[2] Soranakom C, Mobasher B (2008) Correlation of tensile and flexural responses of strain softening and strain hardening cement composites. Cement Concrete Compos 30(6):465–77.
[3] Soroushian P, Bayasi Z (1991) Fiber-type effects on the performance of steel fiber reinforced concrete. ACI Mater J 88(2):129–34.
[4] Kim D, Naaman AE, Tawil SE (2008) Comparative flexural behavior of four fiber reinforced cementitious composites. Cement Concrete Compos 30:  917–928.
[5] Alaee F., nazrali G (2007) High performance fiber reinforced cementitious composite with crimped fiber. Fibre Concrete, Prague.
[6] Won J, Hong B, Joon C (2012)  Flexural behaviour of amorphous micro-steel fibre-reinforced cement composites. Compos Struct 94: 1443–1449.
[7] Nguyen D, Kim D, Ryu G (2012) Size effect on flexural behavior of ultra-high-performance hybrid fiber-reinforced concrete. Compos Part B-Eng 45(1): 1104–1116
[8] Banthia N, Trottier J-F (1995) Test methods for flexural toughness characterization of fiber reinforced concrete: some concerns and a proposition. ACI Mater J 92(1): 1–10.
[9] ASTM C 1609/C 1690M-05 (2006) Standard test method for flexural performance of fiber reinforced concrete (using beam with third-point loading). American Society of Testing and Materials 1–8.
[10] ASTM C 1018-97 (1998) Standard test method for flexural toughness and first-crack strength of fiber reinforced concrete (using beam with third-point loading). American Society of Testing and Materials 544–51.
[11] Caijun Shi, Mo YL (2008) High performance constraction materials: Science and Applications. Engineering Materials for Technological Needs.  World Scientific, Singapore, Hackensack.