The main disadvantage of high-strength concrete is its highly brittle behavior and this can beovercome by adding fibers to the concrete. This would also improve some other mechanical properties of high-strength concrete such as tensile strength and compressive strength. These properties are not very well established for high-strength steel-fiber reinforced concrete (HSFRC) yet. In this study the influence of silica fume on the properties of HSFRC were investigated by using silica fume of two different percentages and three different hooked-end fibers namely, 30/0.50, 60/0.80 and 50/0.60 length/diameter (mm/mm). Fibers were added to concrete in three different volume percentages of 0.5, 1.0 and 2.0 by volume of concrete. The results indicated that there is a linear function between splitting tensile strength ( F splt ) and volume percentage of fibers ( V f ) (i.e. F plt = A ( V f ) + B , where A and B are correlation coefficients) as well as between splitting tensile strength ( F splt ) and compressive strength ( F c ) of plain series A concrete (i.e. F splt = C (√ F c ) + D , where C and D are correlation coefficients). These relations can describe the development of splitting tensile strength of HSFRC containing no silica fume, 5% silica fume and 10% silica fume by weight of cement. On the other hand, although silica fume has an effect on compressive strength, volume percentage and aspect ratio of steel fibers has little effect.
Construction and Building Materials – Elsevier
Published: Jan 1, 1997
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