INFLUENCE OF STEEL FIBER CONTENT ON FRACTURE ENERGY OF HPFRCC

Author(s): P. Zhang, W. Ma, F.H. Wittmann, W. Wang and T. Zhao
Book Title: Seventh International RILEM Conference on High Performance Fiber Reinforced Cement Composites (HPFRCC7)
Editor: H.W. Reinhardt, G.J. Parra-Montesinos, H. Garrecht
ISBN: 978-2-35158-145-2
e-ISBN: 978-2-35158-146-9
Publisher: RILEM Publications SARL
Publication year: 2015
Pages: 119-126
Total Pages: 8
Language: English

Abstract: Fracture energy of ordinary concrete and of HPFRCC can be increased by addition of steel fibres to the fresh mix. Based on reliable experimental data optimum fibre content can be determined for a given application in practice. First a fine mortar matrix was optimized by modifying the composition in a systematic way. Different amounts of steel fibres, up to 200 kg/m3, were added to the fine mortar matrix. Stress-strain diagrams of the neat and fibre-reinforced HPFRCC were measured under direct tension. In addition the deformation under three point bending was measured until failure. With both test methods load bearing capacity and fracture energy was determined experimentally. It turned out that the wedge splitting test is not suitable for determination of fracture energy of steel fibre reinforced cement-based composites.

It was found that the maximum tensile load bearing capacity of steel fibre reinforced HPFRCC increases significantly by addition of 150 and 200 kg/m3 steel fibres. After the first crack occurred strain hardening and high fracture energy could be observed at high concentrations of steel fibres. Fracture energy increased almost linearly with the amount of steel fibres added. Results obtained will be presented and discussed in this contribution.

Online publication: 2015
Publication Type: full_text
Public price (Euros): 0.00