STUDY ON THE STRENGTH OF CONCRETE CYLINDERS WRAPPED WITH MULTIPLE LAYERS OF GFRP SHEET

Abstract

As we know that, the concrete is composite material and it has relatively high compressive strength, but significantly low tensile strength. The use of externally bonded fiber-reinforced polymers (FRP) has become increasingly popular for civil infrastructure applications. The Glass fiber reinforced polymer (GFRP) has significantly enhanced the strength and ductility of concrete by forming perfect adhesive bond between concrete and the wrapping material. The present investigation studies the behavior of the concrete wrapped with bidirectional GFRP sheet under uniaxial compression. Specimens considered for the work was cylinders having circular in shape of diameter 150mm and height 300mm. Experiments were conducted on concrete cylinders with and without FRP wrapping. Three specimens were tested with conventional concrete and 1 layer, 2 layers and 3 layers of 100mm center wrapping. The specimens were tested for compressive strength and split-tensile strength. In addition, a stress–strain model is presented to predict the axial compressive behavior of GFRP Wrapped and unwrapped concrete cylinders. Comparisons between the analytical results obtained using the proposed model and experimental results are also presented.