Effect of harsh environmental conditions on the tensile properties of GFRP bars

Abstract This paper presents the test results of an experimental study carried out to investigate the residual tensile properties of new generation of GFRP bars after being subjected to several harsh environmental conditions for different periods. The bars were exposed to ten different environmental conditions for 6, 12, and 18 months. In addition to a control laboratory condition, the environments included exposure to ordinary tap water and sea water at two temperatures (room and 50 °C), sea water dry/wet, alkaline solution, and hot-dry condition at 50 °C. Furthermore, the environments included two typical harsh field conditions of the Kingdom of Saudi Arabia. The performance of the GFRP bars was evaluated by conducting tensile tests on the bars after different exposure periods. Scanning electron microscope was used to investigate the degradation mechanism of the bars. After 18 months of exposure, the test results showed that at 50 °C the tap water and alkaline solution had the maximum harmful effect on the tensile strength of the tested GFRP bars. The two field conditions considered in the present study did not show any significant effect on the tensile properties of the bars. The test results also showed that the GFRP bars tested in this study had better resistance to alkalinity and water compared to most of the GFRP bars in the literature.

[1]  Brahim Benmokrane,et al.  Durability of GFRP bars: a critical review of the literature , 2005 .

[2]  S. Cabral-Fonseca.  DURABILITY OF GLASS FIBRE REINFORCED POLYESTER (GFRP) PULTRUDED PROFILES USED IN CIVIL ENGINEERING APPLICATIONS , 2005 .

[3]  Edoardo Cosenza,et al.  Durability issues of FRP rebars in reinforced concrete members , 2006 .

[4]  S. Syed.  Atmospheric corrosion of hot and cold rolled carbon steel under field exposure in Saudi Arabia , 2008 .

[5]  B. Benmokrane,et al.  Influence of Reinforcement on the Behavior of Concrete Bridge Deck Slabs Reinforced with FRP Bars , 2007 .

[6]  Jong-Pil Won,et al.  The effect of exposure to alkaline solution and water on the strength–porosity relationship of GFRP rebar , 2008 .

[7]  V. Karbhari,et al.  Durability evaluation of moderate temperature cured E-glass/vinylester systems , 2004 .

[8]  T. Almusallam,et al.  Creep effect on the behavior of concrete beams reinforced with GFRP bars subjected to different environments , 2007 .

[9]  John J. Lesko,et al.  THE EFFECTS OF MOISTURE ON THE FATIGUE BEHAVIOR OF A GLASS/VINYL ESTER COMPOSITE , 1998 .

[10]  Francisco Aguiniga Gaona.  Characterization of design parameters for fiber reinforced polymer composite reinforced concrete systems , 2004 .

[11]  M. A. Pisani,et al.  Fatigue behaviour of concrete bridge deck slabs reinforced with GFRP bars , 2010 .

[12]  P. B. Keating,et al.  Characterization of Design Parameters for Fiber Reinforced Polymer Composite Reinforced Concrete Systems , 2005 .

[13]  Yu Zheng,et al.  Investigation of structural behaviours of laterally restrained GFRP reinforced concrete slabs , 2012 .

[14]  A. Nanni.  Guide for the Design and Construction of Concrete Reinforced with FRP Bars (ACI 440.1R-03) , 2005 .

[15]  Julio F. Davalos,et al.  Accelerated aging tests for evaluations of durability performance of FRP reinforcing bars for concrete structures , 2007 .

[16]  Brahim Benmokrane,et al.  Durability of GFRP Reinforcing Bars Embedded in Moist Concrete , 2009 .

[17]  B. Benmokrane,et al.  An exploratory study of GFRP rebar with ribs containing milled glass fibers , 2008 .

[18]  Young-Jun You,et al.  Short-term durability test for GFRP rods under various environmental conditions , 2008 .

[19]  Lawrence C. Bank,et al.  Accelerated Test Methods to Determine the Long-Term Behavior of FRP Composite Structures: Environmental Effects , 1995 .