STRENGTHENING OF CONCRETE CYLINDERS WITH CFRP SHEET

Abstract

Strengthening of Concrete structures with externally wrapping CFRP sheets and plates has become very popular over the past decade. Wrapping is generally applied to concrete specimens, with the aim of enhancing their load carrying and to increase concrete strength and ductility. When concrete cylinder is loaded to axial compressive stress, it expands laterally. The Carbon fiber reinforced polymer (CFRP) has significantly enhanced the strength and ductility of concrete by forming perfect adhesive bond between concrete and the wrapping material. In this work, studied 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 CFRP 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. Along that stressstrain curve is presented to predict the axial compressive behavior of CFRP wrapped and unwrapped concrete cylinders by noting deformations at different loads. Comparisons between the analytical results obtained using the proposed model and experimental results are also presented