An experimental study on flexural strength enhancement of concrete by means of small steel fibers

Abdoullah Namdar, Ideris Bin Zakaria, Azimah Bt Hazeli, Sayed Javid Azimi, Abdul Syukor Bin Abd. Razak, G. S. Gopalakrishna


Cost effective improvement of the mechanical performances of structural materials is an important
goal in construction industry. To improve the flexural strength of plain concrete so as to reduce construction
costs, the addition of fibers to the concrete mixture can be adopted. The addition of small steel fibers with
different lengths and proportion have experimentally been analyzed in terms of concrete flexural strength
enhancement. The main objectives of the present study are related to the evaluation of the influence of steel
fibers design on the increase of concrete flexural characteristics and on the mode of failure. Two types of beams
have been investigated. The force level, deflection and time to failure of beams have been measured. The shear
crack, flexural crack and intermediate shear-flexural crack have been studied. The steel fiber content controlled
crack morphology. Flexural strength and time to failure of fiber reinforce concrete could be further enhanced if,
instead of smooth steel fibers, corrugated fibers were used.

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