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The details of mix proportions used in this research are given in Table 1 Ordinary Portland cement type I with high grade 52 5N and silica fume SF were used as cementitious materials The chemical compositions and physical properties of the cementitious materials used are listed in Table 2 For all test specimens a W C of 0 18 was applied Sand with grain size smaller than 0 6 were used Natural crushed basalt graded from 1 18 mm to 10 0 mm max nominal size was used as a coarse aggregate To improve fluidity a high performance water reducing agent Sikament NN super plasticizer SP was added to investigate the effect of steel fiber volume fraction and aspect ratio on the mechanical properties steel fibers with a length of 30 mm and a diameter of 1 0 mm and steel fibers with a length of 50 mm and a diameter of 1 0 mm were considered in three different volume fractions 0 1 2 and 3 with aspect ratios 50 and 30 leading to seven series of test specimens The properties of steel fiber are presented in Table 3 The test specimens were cured at clean tab water for 28 days Compression test The compression test was carried out on cube specimens 100 100 100 mm and cylinders with 100 mm diameter and 200 mm height after 28 days curing
