GFRP Reinforcement in Concrete after 15 Years of Service

Omid Gooranorimi, Antonio Nanni

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Glass fiber-reinforced polymer (GFRP) composite bar is emerging as a feasible and economical solution to eliminate the corrosion problem of steel reinforcements in concrete structures; thus, confirmation of its long-term durability is crucial. The objective of this study is to investigate the performance of GFRP bars exposed to concrete alkalinity and ambient conditions after 15 years of service. In order to monitor possible changes in GFRP and concrete, samples were extracted from a bridge for various types of analysis. Carbonation depth and pH of the concrete surrounding the GFRP bars were measured. Scanning electron microscopy (SEM) imaging and energy dispersive X-ray spectroscopy (EDS) were performed on GFRP coupons. Finally, GFRP horizontal shear strength, glass transition temperature (Tg), and fiber content were measured and compared with the results of similar tests performed on control samples at the time of construction. The SEM and EDS did not show any sign of GFRP microstructural deterioration or change of chemical composition, and Tg and fiber content were comparable to pristine values while the results of the horizontal shear strength were inconclusive. This study adds new evidence to the validation of the long-term durability of GFRP bars as concrete reinforcement in field applications.

Original languageEnglish (US)
Article number04017024
JournalJournal of Composites for Construction
Volume21
Issue number5
DOIs
StatePublished - Oct 1 2017

Fingerprint

Glass fibers
Reinforcement
Polymers
Concretes
Shear strength
Energy dispersive spectroscopy
Durability
Concrete reinforcements
Scanning electron microscopy
Carbonation
fiberglass
Fibers
Steel
Alkalinity
Concrete construction
Deterioration
Corrosion
Imaging techniques
Composite materials
Chemical analysis

Keywords

  • Durability
  • Glass fiber-reinforced polymer (GFRP)
  • Horizontal shear strength
  • Reinforced concrete
  • Scanning electron microscopy (SEM)

ASJC Scopus subject areas

  • Ceramics and Composites
  • Civil and Structural Engineering
  • Building and Construction
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

GFRP Reinforcement in Concrete after 15 Years of Service. / Gooranorimi, Omid; Nanni, Antonio.

In: Journal of Composites for Construction, Vol. 21, No. 5, 04017024, 01.10.2017.

Research output: Contribution to journalArticle

@article{e1cd322724964a3292c8cefdf6505882,
title = "GFRP Reinforcement in Concrete after 15 Years of Service",
abstract = "Glass fiber-reinforced polymer (GFRP) composite bar is emerging as a feasible and economical solution to eliminate the corrosion problem of steel reinforcements in concrete structures; thus, confirmation of its long-term durability is crucial. The objective of this study is to investigate the performance of GFRP bars exposed to concrete alkalinity and ambient conditions after 15 years of service. In order to monitor possible changes in GFRP and concrete, samples were extracted from a bridge for various types of analysis. Carbonation depth and pH of the concrete surrounding the GFRP bars were measured. Scanning electron microscopy (SEM) imaging and energy dispersive X-ray spectroscopy (EDS) were performed on GFRP coupons. Finally, GFRP horizontal shear strength, glass transition temperature (Tg), and fiber content were measured and compared with the results of similar tests performed on control samples at the time of construction. The SEM and EDS did not show any sign of GFRP microstructural deterioration or change of chemical composition, and Tg and fiber content were comparable to pristine values while the results of the horizontal shear strength were inconclusive. This study adds new evidence to the validation of the long-term durability of GFRP bars as concrete reinforcement in field applications.",
keywords = "Durability, Glass fiber-reinforced polymer (GFRP), Horizontal shear strength, Reinforced concrete, Scanning electron microscopy (SEM)",
author = "Omid Gooranorimi and Antonio Nanni",
year = "2017",
month = "10",
day = "1",
doi = "10.1061/(ASCE)CC.1943-5614.0000806",
language = "English (US)",
volume = "21",
journal = "Journal of Composites for Construction",
issn = "1090-0268",
publisher = "American Society of Civil Engineers (ASCE)",
number = "5",

}

TY - JOUR

T1 - GFRP Reinforcement in Concrete after 15 Years of Service

AU - Gooranorimi, Omid

AU - Nanni, Antonio

PY - 2017/10/1

Y1 - 2017/10/1

N2 - Glass fiber-reinforced polymer (GFRP) composite bar is emerging as a feasible and economical solution to eliminate the corrosion problem of steel reinforcements in concrete structures; thus, confirmation of its long-term durability is crucial. The objective of this study is to investigate the performance of GFRP bars exposed to concrete alkalinity and ambient conditions after 15 years of service. In order to monitor possible changes in GFRP and concrete, samples were extracted from a bridge for various types of analysis. Carbonation depth and pH of the concrete surrounding the GFRP bars were measured. Scanning electron microscopy (SEM) imaging and energy dispersive X-ray spectroscopy (EDS) were performed on GFRP coupons. Finally, GFRP horizontal shear strength, glass transition temperature (Tg), and fiber content were measured and compared with the results of similar tests performed on control samples at the time of construction. The SEM and EDS did not show any sign of GFRP microstructural deterioration or change of chemical composition, and Tg and fiber content were comparable to pristine values while the results of the horizontal shear strength were inconclusive. This study adds new evidence to the validation of the long-term durability of GFRP bars as concrete reinforcement in field applications.

AB - Glass fiber-reinforced polymer (GFRP) composite bar is emerging as a feasible and economical solution to eliminate the corrosion problem of steel reinforcements in concrete structures; thus, confirmation of its long-term durability is crucial. The objective of this study is to investigate the performance of GFRP bars exposed to concrete alkalinity and ambient conditions after 15 years of service. In order to monitor possible changes in GFRP and concrete, samples were extracted from a bridge for various types of analysis. Carbonation depth and pH of the concrete surrounding the GFRP bars were measured. Scanning electron microscopy (SEM) imaging and energy dispersive X-ray spectroscopy (EDS) were performed on GFRP coupons. Finally, GFRP horizontal shear strength, glass transition temperature (Tg), and fiber content were measured and compared with the results of similar tests performed on control samples at the time of construction. The SEM and EDS did not show any sign of GFRP microstructural deterioration or change of chemical composition, and Tg and fiber content were comparable to pristine values while the results of the horizontal shear strength were inconclusive. This study adds new evidence to the validation of the long-term durability of GFRP bars as concrete reinforcement in field applications.

KW - Durability

KW - Glass fiber-reinforced polymer (GFRP)

KW - Horizontal shear strength

KW - Reinforced concrete

KW - Scanning electron microscopy (SEM)

UR - http://www.scopus.com/inward/record.url?scp=85039951844&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85039951844&partnerID=8YFLogxK

U2 - 10.1061/(ASCE)CC.1943-5614.0000806

DO - 10.1061/(ASCE)CC.1943-5614.0000806

M3 - Article

AN - SCOPUS:85039951844

VL - 21

JO - Journal of Composites for Construction

JF - Journal of Composites for Construction

SN - 1090-0268

IS - 5

M1 - 04017024

ER -