BEHAVIOR OF REINFORCED CONCRETE COLUMNS BY USING STEEL SLAG AND REINFORCED BY FRP GLASS BARS

Studying the axial compressive behavior of concrete columns reinforced with fiber-reinforced polymer (FRP) bars have been the subject of some studies, yet most studies focused on normal concrete without fibers. This study presents an experimental investigation of the axial behavior of concrete columns reinforced longitudinally with glass fiber-reinforced polymer (GFRP) bars by adding steel slag as a partial replacement of the coarse aggregate. Twelve columns are designed and tested in a vertical position and under compressive axial static loading to study how different parameters affect the axial compressive behavior of concrete column with steel slag and reinforced with (GFRP), the studied parameters are reinforcement type, longitudinal reinforcement ratio, spacing and ratio of steel ties, and the characteristic strength of concrete. All columns have the same crosssection dimensions 200*200mm and 1000mm height, the main (GFRP) reinforcements are 4#12mm, 6#12mm, and 8#12mm, and the transverse reinforcement is of steel stirrups. Results of specimens tests show that increasing main reinforcement, transverse reinforcement ratios in the column ends, or increasing characteristic strength of concrete have significantly enhanced the behavior of reinforced concrete columns contains steel slag as a partial replacement of the coarse aggregate, and reinforced by (GFRP) bars.