Issue 42

A. Jadidi et alii, Frattura ed Integrità Strutturale, 42 (2017) 249-262; DOI: 10.3221/IGF-ESIS.42.27 252 maximum pressure in kgf. This maximum pressure (force) is written down, and calculated in MPa with the help of compressive test graph. Figure 2 : Four-point bending machine. Figure 3 : Compressive strength machine. Experiment method Two sets of compressive samples are smoothened with the help of a grindstone. The samples are then placed and fixed between the pressing machine jaws. The compressive strength is calculated as: maximum load recorded by the machine divided by cross-sectional area of samples. p 1000 fc b d    (3) Materials used Quartz aggregates are used in this study, with particle sizes at most 5.0 mm and a specific gravity of 2.75 g/cm 3 . The dimensions of the aggregates used in this research are given in Tab. 1. The quality and requirements of the water used in steel fiber-reinforced concrete are similar to those used in plain concrete. The water used in this study is the drinking water of the city of Arak 1 which is of acceptable quality. Type 2 cement of Delijan 2 cement factory was used in making all samples. It is worth noting that, micro silica slurry and PCE super plasticizer (produced by Vandshimi Company) have been used in this research. Also, the fibers employed in the 1 Center of Markazi province 2 A city in Markazi province