MPC Research Reports
Report Details

Title:	Experimental Fatigue Assessment of CFRP-Retrofitted Reinforced Concrete Beams Subjected to Service Temperatures
Authors:	Hussam Mahmoud, Mehrdad Memari, and Rebecca Atadero
University:	Colorado State University
Publication Date:	Aug 2018
Report #:	MPC-18-362
Project #:	MPC-412
TRID #:	01710735
Keywords:	beams, carbon fibers, fatigue cracking, fiber reinforced polymers, reinforced concrete, reinforcing bars, retrofitting, temperature

Abstract

The use of Carbon Fiber Reinforced Polymers (CFRP) for the repair of civil infrastructure has been on the rise. Most studies have focused on the effect of CFRP to increase the stiffness and strength of reinforced concrete beams or columns. Limited attention has been given to the effect of CFRP on mitigating fatigue crack growth in steel reinforcement. Understanding how CFRP affects fatigue crack growth in rebar is important for predicting the impact of CFRP repairs on service life extension. This paper presents the results of an experimental study on the effect of externally bonded CFRP on slowing or arresting fatigue crack growth in the steel rebar in a reinforced concrete beam subjected to cyclic loading and service temperature. Localized debonding of the CFRP was observed and is attributed to the application of service temperature. Despite the development of localized debonding, the fatigue life was extended overall in specimens repaired with CFRP systems and subjected to service temperatures in comparison to those only repaired with CFRP. Crack growth rates were used to determine material constants for the Paris Law, which describes growth of a stable fatigue crack.

How to Cite

Mahmoud, Hussam, Mehrdad Memari, and Rebecca Atadero. Experimental Fatigue Assessment of CFRP-Retrofitted Reinforced Concrete Beams Subjected to Service Temperatures, MPC-18-362. North Dakota State University - Upper Great Plains Transportation Institute, Fargo: Mountain-Plains Consortium, 2018.