Title:
New Durability Concept for FRP Reinforcing Bars
Author(s):
Andre Weber and Christian Witt Baquero
Publication:
Concrete International
Volume:
32
Issue:
7
Appears on pages(s):
49-53
Keywords:
reinforcing bars, FRP, tensile strength, failure
DOI:
Date:
7/1/2010
Abstract:
A new time-to-failure concept has been developed for glass fiber-reinforced polymer (GFRP) reinforcing bars in concrete. A series of bars is tested in highly alkaline water-saturated concrete at 23, 40, and 60°C (73, 104, and 140°F). The failure line of the material over time is described by a slope and the strength after 1000 hours of loading. Characteristic (5th percentile) values of the tensile strength for a specific design service life and a defined environment can be calculated. The concept allows for potentially much higher design values than do existing codes and guidelines, but without compromising safety. The concept applies to any fiber-reinforced polymer reinforcing bar, and it has been internationally accepted and adopted by fib.