Study the behavior of Slurry infiltrated fibrous concrete (SIFCON) under impact loading

Abstract

SIFCON, as a type of fiber reinforced concrete (FRC), has a unique and superior properties in the areas of both ductility and energy absorption and the impact resistance is recognized as one of the significant properties of SIFCON. The main object of present study is to determine the influence of SIFCON mortar type and fiber volume fraction on the behavior of SIFCON under impact loading. For SIFCON mortar, supplementary cementitious materials [Class F fly ash (FA) and silica fume (SF)] were used as a partial replacement by weight of cement. The percentage of FA replacement was (20%) and of SF replacement was (10%). Hooked end steel fibers were used with different fiber volume fraction (6, 8.5, and 11) %, the test was carried out using disc specimen (152 mm diameter by 63 mm thick). The test results were compared with those of fiber reinforced mortar (FRM) containing 2% fiber volume fraction, as a reference (control) mix. The test results show that in general, there is a significant improvement in impact resistance of all SIFCON mixes with increasing fiber volume fraction. SIFCON mix containing SF and FA and 11% volume fraction exhibited the highest impact resistance, and the energy required for completing failure was increased by 11.87 times, when compared with the control mix at 90 days.