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A. Namdar et alii, Frattura ed Integrità Strutturale, 26 (2013) 22-30 ; DOI: 10.3221/IGF-ESIS.26.03 30 research work smooth steel fiber has been used. It is well known that deformed steel fiber and rough surface steel fiber exhibit better performance. R EFERENCES [1] Kang, S.T., Lee, B.Y., Kim, J.K., Kim, Y.Y., The effect of fibre distribution characteristics on the flexural strength of steel fibre-reinforced ultra high strength concrete, Construction and Building Materials, 25 (2011) 2450-2457. [2] Stähli, V., Sutter, M., van Mier, JGM., Improving the mechanical properties of HFC by adjusting the filling method, In: Proceeding of RILEM fifth international workshop on high performance fibre reinforced cement composites (HPFRCC5), Mainz, Germany, (2007) 23-30. [3] Toutanji, H., Bayasi, Z., Effect of manufacturing techniques on the flexural behaviour of steel fiber-reinforced concrete, Cem Concr Res, 28 (1998) 115-24. [4] Yang, I.H., Joh, C., Kim, B.S., Flexural strength of ultra high strength concrete beams reinforced with steel fibers, Procedia Engineering, 14 (2011) 793-796. [5] Deng, J., Lee, M.M.K., Li, S., Flexural strength of steel–concrete composite beams reinforced with a prestressed CFRP plate, Construction and Building Materials, 25 (2011) 379-384. [6] Khaloo, A.R., Afshari, M., Flexural behaviour of small steel fibre reinforced concrete slabs, Cement & Concrete Composites, 27 (2005) 141-149. [7] Ghalib, M.A., Moment capacity of steel fibre reinforced small concrete slabs, ACI Journal, (1980) 247-57 [8] Bernal, S., Gutierrez, R.D., Delvasto, S., Rodriguez, E., Performance of an alkali-activated slag concrete reinforced with steel fibers, Construction and Building Materials, 24 (2010) 208-214. [9] Soutsos, M.N., Le, T.T., Lampropoulos, A.P., Flexural performance of fibre reinforced concrete made with steel and synthetic fibres, Construction and Building Materials, 36 (2012) 704-710. N OMENCLATURE L.F = Length of fiber (mm) W.F = Weight of fiber in a beam (g) %.F = % of fiber in a beam B1 = Beam with dimension of 100 (mm) × 100 (mm) × 500 (mm) B2 = Beam with dimension of 150 (mm) × 150 (mm) × 1000 (mm)