Performance evaluation and microstructural characterization of GFRP bars in seawater-contaminated concrete

Hilal El-Hassan, Tamer El-Maaddawy, Abdelrahman Al-Sallamin, Abdullah Al-Saidy

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

This paper aims to investigate the durability performance and microstructure characteristics of two different types of commercially-produced glass fiber-reinforced polymer (GFRP) bars conditioned in moist seawater-contaminated concrete. GFRP bars encased in seawater-contaminated concrete were immersed in tap water for 5, 10, and 15 months at temperatures of 20, 40, and 60 °C. Following conditioning, the GFRP bars were retrieved then tested to failure under uniaxial tension. Microstructure analysis was performed by employing differential scanning calorimetry (DSC), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and matrix digestion using nitric acid. Type I GFRP bars, with the lower moisture uptake, exhibited insignificant strength reductions in the range of 2–15% whereas Type II, with the higher moisture uptake, exhibited substantial strength reductions in the range of 19–50%. Type II GFRP bars featured lower matrix retention and developed higher hydroxyl ions during conditioning than those of their Type I counterparts. The extent of degradation was more sensitive to the conditioning temperature rather than conditioning duration. A decrease in the glass transition temperature (Tg) of both types of GFRP bars was recorded, indicating matrix plasticization. Results of SEM highlighted matrix disintegration and fiber debonding after conditioning.

Original languageEnglish
Pages (from-to)66-78
Number of pages13
JournalConstruction and Building Materials
Volume147
DOIs
Publication statusPublished - Aug 30 2017

Fingerprint

Seawater
Glass fibers
Polymers
Concretes
Moisture
Nitric Acid
Microstructure
Scanning electron microscopy
Disintegration
Debonding
Nitric acid
Fourier transform infrared spectroscopy
fiberglass
Differential scanning calorimetry
Durability
Degradation
Temperature
Water
Fibers
Ions

Keywords

  • Concrete
  • Durability performance
  • GFRP
  • Microstructure
  • Seawater
  • Tensile strength

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

Cite this

Performance evaluation and microstructural characterization of GFRP bars in seawater-contaminated concrete. / El-Hassan, Hilal; El-Maaddawy, Tamer; Al-Sallamin, Abdelrahman; Al-Saidy, Abdullah.

In: Construction and Building Materials, Vol. 147, 30.08.2017, p. 66-78.

Research output: Contribution to journalArticle

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