TY - GEN
T1 - Microstructural characterization of GFRP reinforcing bars in severe environment
AU - El-Hassan, Hilal
AU - Al-Sallamin, Abdelrahman
AU - El-Maaddawy, Tamer
PY - 2016
Y1 - 2016
N2 - Glass fiber-reinforced polymer (GFRP) bars are increasingly used as internal reinforcement in concrete structures because of their noncorrosive nature, lightweight, high strength, and ultraviolet resistance. The microstructure and composition changes of GFRP bars exposed to severe environmental conditions are investigated in this paper. Test specimens were placed in moist seawater-contaminated concrete for up to 15 months at temperatures of 20, 40, and 60°C. Microstructural analysis was performed using differential scanning calorimetry (DSC), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and matrix digestion using nitric acid. A decrease in glass transition temperature (Tg) and matrix content of GFRP bars was recorded after conditioning. Conditioned GFRP bars exhibited matrix plasticization and chemical degradation. Findings from FTIR showed an increase in hydroxyl ions with conditioning at higher temperatures. Results of SEM indicated a separation at the fiber-matrix interface and matrix deterioration in conditioned specimens.
AB - Glass fiber-reinforced polymer (GFRP) bars are increasingly used as internal reinforcement in concrete structures because of their noncorrosive nature, lightweight, high strength, and ultraviolet resistance. The microstructure and composition changes of GFRP bars exposed to severe environmental conditions are investigated in this paper. Test specimens were placed in moist seawater-contaminated concrete for up to 15 months at temperatures of 20, 40, and 60°C. Microstructural analysis was performed using differential scanning calorimetry (DSC), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and matrix digestion using nitric acid. A decrease in glass transition temperature (Tg) and matrix content of GFRP bars was recorded after conditioning. Conditioned GFRP bars exhibited matrix plasticization and chemical degradation. Findings from FTIR showed an increase in hydroxyl ions with conditioning at higher temperatures. Results of SEM indicated a separation at the fiber-matrix interface and matrix deterioration in conditioned specimens.
KW - Concrete
KW - Microstructure, GFRP
KW - Severe environment
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M3 - Conference contribution
AN - SCOPUS:85019015305
T3 - Materials Engineering and Sciences Division 2016 - Core Programming Area at the 2016 AIChE Annual Meeting
SP - 295
EP - 302
BT - Materials Engineering and Sciences Division 2016 - Core Programming Area at the 2016 AIChE Annual Meeting
PB - AIChE
T2 - Materials Engineering and Sciences Division 2016 - Core Programming Area at the 2016 AIChE Annual Meeting
Y2 - 13 November 2016 through 18 November 2016
ER -