Title: Carbon Fiber-Reinforced Polymer Confined Reactive Powder Concrete Columns - Experimental Investigation

Author(s): Adnan R. Malik and Stephen J. Foster

Publication: Structural Journal

Volume: 107

Issue: 3

Appears on pages(s): 263-271

Keywords: carbon fiber-reinforced polymer; columns; confinement; reactive powder concrete; wrapping.

DOI: 10.14359/51663691

Date: 5/1/2010

Abstract:
An experimental investigation was conducted to investigate the behavior of ultra-high-strength reactive powder concrete (RPC) columns confined by carbon fiber-reinforced polymers (CFRPs) and subjected to concentric and eccentric loadings. Seventeen columns were cast with the concrete mixture containing either no fibers, with a concrete strength of approximately 140 MPa (20.3 ksi), or 2% (by volume) of straight steel fibers, with a concrete strength of approximately 165 MPa (23.9 ksi). The column specimens contained no conventional steel reinforcement, either in the longitudinal or transverse direction with the tensile forces carried by the CFRP. Experimental data for strength, lateral and axial deformation, and the failure mode were obtained for each test. For the concentrically loaded specimens, failure occurred at or close to the peak loading with little or no residual capacity. The transverse strains measured at the fracture of the CFRP for confined columns were found to be significantly lower than the ultimate tensile strength reported by the manufacturer or obtained from the standard tensile coupon tests. For the eccentrically loaded columns, the final failure was sudden and explosive but only after the peak load was passed and at the point of tearing of the CFRP wrapping. There was no evidence, however, that the use of CFRP in the hoop direction significantly increased the strength for the eccentrically loaded columns.