Effect of Change in Micro Steel Fiber Content on Properties of High Strength Steel Fiber Reinforced Lightweight Self-Compacting Concrete (HSLSCC)

As known, with addition of fibers to concrete, the properties of concrete are altered. Steel fiber is one of the common fiber used in concrete. Using lightweight concrete is extremely important for reducing the self-weight of structures, especially in heavy ones, like high rise buildings. It enables to decrease additional loads in case of renovation or/strengthening of existing structures. Moreover, self-compaction avoids using vibrations for compaction of concrete in existing structures. Therefore the present study is aimed at investigating the effect of change in micro steel fiber content on the properties of high strength steel fiber reinforced lightweight self-compacting (HSLSCC). For this reason slump flow test was conducted to find workability of the fresh concrete mixture. Further compressive strength, splitting tensile strength, modulus of elasticity and flexural strength of the hardened concrete were tested. Four concrete mixes of HSLSCC with different fiber contents were prepared to study the change in its fresh and hardened properties. Results show that there is strong influence on workability of SCC with steel fiber content of 1% or more. There is around 7% reduction in compressive strength, 18% and 70% increase in splitting tensile strength and flexural strength respectively, with increase of steel fiber content from 0.5% to 1.25%, while the modulus of elasticity remains almost the same.