Influence of Mix Proportions on The Impact Resistance of High Strength Concrete

Abstract

This research aim to study the Influence of mix proportions on the impact resistance of high strength concrete, Trial laboratory batches were used including as follows: -Normal concrete mixture (C1) as a reference mix ((w/c) = 0.45, without admixtures);-Four concrete mixtures (C2, C3, C4, C5) prepared by fixing (w/c) =0.45, and using different amount of super plasticizers (0.25, 0.50, 0.75, 1.00)% as a percentage of cement content, respectively; -Four concrete mixtures (C6, C7, C8, C9) prepared by reducing and fixing (w/c) = 0.30, and using silica fume = (15)% as replacement of cement content and different amount of superplasticizers (1.25, 1.50, 1.75, 2.00)% as a percentage of cement content; and -Three concrete mixtures (C10, C11, C12) prepared by fixing the amount of superplasticizers (1.50)% and using different (w/c) = (0.40, 0.29, 0.27).Results show that Mixture C11 prepared with (1.50%) addition of superplasticizers and (15%) addition of silica fume leads to (90.29%) increasing in the compressive strength and records an improvement in the impact resistance by (725.56%) as compared with the reference mix. On the other hand, all of the mix proportions lead to an increase in both compressive strength and impact resistance for all the mixes.

Keywords

• Mix proportions
• Impact Resistance
• Compressive Strength
• Superplasticizers
• ACI 544
• First-Crack Strength