Performance Evaluation of Metallic Fibres on the Low and high Volume Class F Flyash based Cement Concrete

Flyash based concrete attracts more attention owing to huge cost savings, reduction in the heat of hydration and longer durability. This research study presents the experimental investigation thatwas carried out to evaluate the performance characteristics of flyash addition in concrete. The concrete mixtures were prepared with different dosages of steel fibres and different replacement level of Class F flyash. The test results on mechanical properties indicated that the addition of flyash at 30% and 50% showed an initial reduction in compressive strength. However, at longer curing periods there was a subsequent gain in strength. Also, the addition of steel fibres at 1% volume fraction showed a consistent improvement in the concrete strength of 45.50 MPa and 59.80 MPa at 7 and 28 days respectively. It can be concluded that the addition of 30% of flyash with 1% steel fibre based concrete showed a marginal improvement in compressive strength and significant increase in flexural strength than conventional concrete.