Experiment Study on Strength of Concrete using Nanosilica

Abstract

In recent times, the retrofitting of existing columns has become indispensable, necessitating the use of Carbon Fiber Reinforced Polymers (CFRPs) to fortify reinforced concrete columns. This application has led to notable enhancements in both strength and stability. Research, encompassing both experimental and theoretical approaches, has delved into the performance of concrete confined with CFRPs, particularly focusing on circular columns under concentric loading conditions. The findings from these studies indicate that CFRP confinement is more effective in circular columns compared to square columns. This is attributed to the concentration of stresses at the corners of square columns, resulting in a lower active area for CFRP confinement. Consequently, modifying square columns to a circular shape has been observed to enhance the effectiveness of CFRP confinement.