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A. Namdar et alii, Frattura ed Integrità Strutturale, 26 (2013) 22-30; DOI: 10.3221/IGF-ESIS.26.03 24 Ingredients Amount (kg/m³) Grade 40 W/C Ratio 0.47 Mix Water 92.73 Cement (Portland) 198 Fine Aggregate (Sand) 320.76 Coarse Aggregate (Max: 20mm) 593.9 Table 1 : Proportion of materials for concrete Grade 40. Figure 4 : Stress-strain curve of plain concrete on 14 days. Figure 5 : Deflection testing equipment for testing beam B1 (part A) and same equipment used to measured compressive strength of plain concrete cube (part B). M ETHOD OF CONCRETE MIXING he plain concrete has been produced by using conventional method. In order to make good plain concrete, first the water has been dropped in mixer and subsequently cement has been added to the water and mixture has been continued until the cement paste has been made, then all aggregates have uniformly been mixed, and mixer has been stopped. The fiber has been added at final step. The linearly distribution of fiber is critical part of this method. The steel fiber in surface of beam is shown in Fig. 1. Concrete-steel fiber mixture needs to be done carefully to ensure the steel T