Structural Behavior of GFRP Reinforced Recycled Aggregate Concrete Columns with Polyvinyl Alcohol and Polyprophylene Fibers

Abstract

This research had the purpose of demonstrating the axial compressive behavior shown by GRFC columns by making a total of five circular columns (with height and cross section of 1150mm and 250mm respectively) and having them tested under the axial concentric loading. The micro fibers incorporated into concrete were of two separate kinds namely polypropylene fibers (PPF) as well as polyvinyl alcohol fibers (PVA). The transverse confinement provided was of two different types (GFRP hoops as well as the GFRP spirals). In order to explore the GFRP hoops’ efficiency, the spacing was kept at 75 mm, 150 mm, and 250 mm, respectively. Whereas, spacing of 75mm as well as 38mm was used to examine the GFRC spirals’ efficiency. The axial strength as well as ductility indices were higher for the GRFC columns that were confined with the GFRP spirals. Moreover, a detailed extensive finite element modeling (FEM) was carried out by taking into account the influence shown by hybrid fibers utilizing a revised and improved concrete damaged plastic (CDP) model. The suggested FEM showed high accuracy in capturing axial response as well as the cracking behavior shown by GRFC columns. This study resulted in putting forward a new and unique empirical model in order to capture axial strength shown by the GRFC columns taking into account the effect shown by GFRP bars as well as lateral confinement of the GFRP hoops/spirals.