External strengthening of concrete with natural and synthetic fiber composites

Abstract

The sustainable growth of construction industry mainly depends on the usage of environmental friendly materials. Fiber reinforced polymer (FRP) composites have been used for strengthening of civil engineering structures. Biodegradable composites can contribute to green and safe environment. In this context, Natural fiber reinforced polymers also known as bio fibers are emerging as alternative in composites to strengthen concrete and masonry structures. The present study is focused on the mechanical properties of concrete externally strengthened using natural and synthetic fibers. Experimental investigations were carried out on the mechanical performance of natural (Jute) and synthetic (Polypropylene) fibers. The mechanical properties of externally strengthened concrete such as compressive strength, flexural strength, compressive stress–strain characteristics, modulus of elasticity and strain energy at failure are examined. The test results indicate that compressive strength and flexural strength of concrete are enhanced with FRP confinement by about 22% and 1–2 MPa, respectively. Natural Jute fiber reinforced polymers performance is found to be on par with synthetic polypropylene fibers when used as external strengthening sheets for concrete cylinders and prisms. The natural Jute fiber reinforced polymers are recommended for external concrete confinement.