Experimental study on axial compression behaviour of glass fibre reinforced polymer (GFRP) wrapped nano material concrete columns

Abstract

Fibre reinforced plastics-FRP have become an excellent alternate to upgrade and restore improving failure infrastructures. The failure progress may be due to change in inappropriate design and improper construction practices. Glass Fibre-reinforced plastics (GFRP) wraps/laminates have proved to be a better option for use in infrastructure applications. This study has been made on square conventional columns and GFRP wrapped nano concrete columns under axial loads. The experimental investigation was to consist of the effect of varying the grade of concrete strength to 20 MPa & 30 MPa. In this research work is to evaluate the enhances, the effectiveness of using externally confined single and double layer GFRP wrapped nano concrete columns. Square RC columns of dimensions 150 mm × 150 mm and 750 mm length were cast and tested. One column specimen was of conventional concrete to provide as a reference, while all the remaining Nano concrete columns (NCC) were strengthened with GFRP laminates. The column specimens were provided with Glass Fibre Reinforced Plastics (GFRP) laminates with two different thicknesses. The parameters selected are stiffness, ultimate failure load, interpretation strength at ultimate state, and service load conditions. Further, the loads versus axial behavior were also determined. The associated failure modes and crack patterns for the experimental test column specimens were also examined. The experimental work showed a great improvement in the more strength for single and double layer GFRP wrapped nano concrete columns when compared with reference conventional concrete columns.