This study presents experimentally the combined effect of using Nano-silica, Alccofine, GGBS, and steel fibers on the mechanical properties of hardened concrete. Nano-Silica, Alccofine, and GGBS are used as partial cement replacement by different percentages, and Steel Fiber is used as volume substitution by different percentages. Compressive strength, splitting tensile strength, and flexural strength are evaluated using different combinations between Nano-Silica, Alccofine, and GGBS. Significant improvement in the mechanical properties of concrete is observed on using Nano-Silica due to its high pozzolanic activity. The Optimum content of Steel Fiber is improved splitting tensile strength by 1%t percentage respectively compared to control mix concrete. Utilizing Nano-Silica and GGBS with Steel Fiber leads to improving compressive strength compared to other concrete mixes. Flexural strength is doubled for using Nano-Silica, GGBS, and Steel Fiber compared to other concrete.
This study presents experimentally the combined effect of using Nano-silica (NS) and steel fibers (SF) on the mechanical properties of hardened concrete. NS is used as partial cement replacement by different percentages, and SF is used as volume substitution by different percentages. Splitting tensile strength, modulus of elasticity, and flexural strength are evaluated using different combinations between NS and SF. Significant improvement in the mechanical properties of concrete is observed on using NS due to its high pozzolanic activity. The Optimum content of SF is improved splitting tensile strength with different percentages respectively compared to without either NS or SF. Utilizing NS with SF leads to improving modulus of elasticity compared to without either NS or SF. Flexural strength is doubled for using NS and SF compared to without NS and SF.
The partial replacement of cement with nanomaterials such as nano-silica(NS) particles in concrete improves its strength and other properties. In this study, the effect of NS as a partial replacement of cement for concrete mixes and concrete beams was examined. The studied response characteristics of reinforced concrete beams included compressive strength, failure mechanisms, load-carrying capacity, and load-deflection behavior. The results showed that compressive strength increased with an increase in NS content up to 2.0% replacement of cement weight. The rate of increase in compressive strength was no longer significant beyond 2.0% replacement, indeed there was a slight decrease in compressive strength for NS content of 3.0%. The effect of increased NS content on the flexural behavior of beams was also studied. Increased NS content led to increases in the first-cracking and ultimate loads and reductions in the deflection at cracking and ultimate load levels.
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