Author:
Publisher:
ISBN:
Category : Epoxy coatings
Languages : en
Pages : 79
Book Description
Effectiveness of epoxy-coated reinforcing steel
Effectiveness of Epoxy-Coated Reinforced Steel
Author: Kenneth C. Clear
Publisher:
ISBN: 9781895102901
Category : Epoxy coatings
Languages : en
Pages : 94
Book Description
The primary function of an eposy-coating is to act as a barrier to prevent corrosion-causing chloride ions and oxygen from reaching steel surfaces. For more than a decade, epoxy-coated reinforcing steel has generally been effective in reducing or preventing chloride-induced corrosion in bridges and other concrete structures. Recently, however, instances of corrosion problems or premature failures in Florida, Oregon and New York have focussed attention on the product and its quality. This report was initiated as a result of the questions raised by these failures.
Publisher:
ISBN: 9781895102901
Category : Epoxy coatings
Languages : en
Pages : 94
Book Description
The primary function of an eposy-coating is to act as a barrier to prevent corrosion-causing chloride ions and oxygen from reaching steel surfaces. For more than a decade, epoxy-coated reinforcing steel has generally been effective in reducing or preventing chloride-induced corrosion in bridges and other concrete structures. Recently, however, instances of corrosion problems or premature failures in Florida, Oregon and New York have focussed attention on the product and its quality. This report was initiated as a result of the questions raised by these failures.
Performance of Epoxy-coated Reinforcing Steel in Highway Bridges
Author: Kenneth C. Clear
Publisher: Transportation Research Board
ISBN: 9780309053709
Category : Bridges, Iron and steel
Languages : en
Pages : 164
Book Description
Publisher: Transportation Research Board
ISBN: 9780309053709
Category : Bridges, Iron and steel
Languages : en
Pages : 164
Book Description
Summary Report on the Performance of Epoxy-coated Reinforcing Steel in Virginia
Author: Richard E. Weyers
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 32
Book Description
From 1992 to 2006, the Virginia Transportation Research Council and its contract researchers conducted a long-term systematic series of investigations to evaluate the corrosion protection effectiveness of epoxy-coated reinforcement (ECR) and to identify and recommend the best and most cost-effective corrosion protection system for Virginia bridge decks. This report summarizes this research and subsequent efforts to implement alternative reinforcement. The work was conducted, and is reported, in this general order: review of historical performance of ECR, ECR performance in solutions and concrete, and preliminary field investigations; investigation of field performance of bridge decks built with ECR; assessment of alternative corrosion protection methods; development of probabilistic service life models for bridge decks and laboratory assessment of ECR cores extracted from bridge decks to determine service life extension; efforts to implement alternative reinforcement. The series of studies demonstrated that the epoxy coating on ECR naturally degrades in the highly alkaline moist environment within concrete. The subsequent loss of bond, coupled with the inevitable flaws in the coating induced by construction, leads to an estimated service life benefit of ECR of as little as 3 to 5 years. Further, non-critical decks, beams, and substructure elements not exposed to marine environments, particularly on secondary and rural routes, can be cost-effectively constructed and maintained using low-permeability concrete and black reinforcing bar. However, because the Federal Highway Administration requires the use of corrosion-resistant reinforcement, and because ECR cannot provide adequate corrosion protection for structures designed for a 100-year+ service life as currently recommended by FHWA, the report recommends that the Virginia Department of Transportation amend its specifications regarding the use of ECR to require the use of corrosion-resistant metallic reinforcing bars such as MMFX2, stainless steel clad, and solid stainless steel.
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 32
Book Description
From 1992 to 2006, the Virginia Transportation Research Council and its contract researchers conducted a long-term systematic series of investigations to evaluate the corrosion protection effectiveness of epoxy-coated reinforcement (ECR) and to identify and recommend the best and most cost-effective corrosion protection system for Virginia bridge decks. This report summarizes this research and subsequent efforts to implement alternative reinforcement. The work was conducted, and is reported, in this general order: review of historical performance of ECR, ECR performance in solutions and concrete, and preliminary field investigations; investigation of field performance of bridge decks built with ECR; assessment of alternative corrosion protection methods; development of probabilistic service life models for bridge decks and laboratory assessment of ECR cores extracted from bridge decks to determine service life extension; efforts to implement alternative reinforcement. The series of studies demonstrated that the epoxy coating on ECR naturally degrades in the highly alkaline moist environment within concrete. The subsequent loss of bond, coupled with the inevitable flaws in the coating induced by construction, leads to an estimated service life benefit of ECR of as little as 3 to 5 years. Further, non-critical decks, beams, and substructure elements not exposed to marine environments, particularly on secondary and rural routes, can be cost-effectively constructed and maintained using low-permeability concrete and black reinforcing bar. However, because the Federal Highway Administration requires the use of corrosion-resistant reinforcement, and because ECR cannot provide adequate corrosion protection for structures designed for a 100-year+ service life as currently recommended by FHWA, the report recommends that the Virginia Department of Transportation amend its specifications regarding the use of ECR to require the use of corrosion-resistant metallic reinforcing bars such as MMFX2, stainless steel clad, and solid stainless steel.
Time-to-corrosion of Reinforcing Steel in Concrete
Author: Yash Paul Virmani
Publisher:
ISBN:
Category :
Languages : en
Pages : 71
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 71
Book Description
Evaluation of Epoxy-coated Reinforcing Steel
Author: Wallace T. McKeel
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 28
Book Description
Virginia's first installation of epoxy-coated reinforcing steel, which was opened to traffic in 1977, was evaluated during construction and through 13 years of service. It was apparent at the time of construction that the integrity of the coating application did not meet the requirements of the specifications There were many flaws and holidays in the coatings on all of the bars, and patching with a liquid epoxy compound was not effective. Although the applicability of the findings, which are based on an application that does not represent the best practice, may be limited, useful information on the durability of the coated steel and its role in protecting the deck was developed. It was found that the coated reinforcement was exposed to relatively high chloride concentrations at transverse cracks in the decks early in the life of the structures, but the decks remained in good condition throughout the evaluation period. It was concluded that despite the poor coatings, the coated reinforcing steel contributed to the deck's durability by providing enhanced protection at critical cracked sections. Rebars taken from deck cores showed no signs of rusting, although the steel had a dull dark gray finish that may be underfilm corrosion. No debonding of the coating was evident.
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 28
Book Description
Virginia's first installation of epoxy-coated reinforcing steel, which was opened to traffic in 1977, was evaluated during construction and through 13 years of service. It was apparent at the time of construction that the integrity of the coating application did not meet the requirements of the specifications There were many flaws and holidays in the coatings on all of the bars, and patching with a liquid epoxy compound was not effective. Although the applicability of the findings, which are based on an application that does not represent the best practice, may be limited, useful information on the durability of the coated steel and its role in protecting the deck was developed. It was found that the coated reinforcement was exposed to relatively high chloride concentrations at transverse cracks in the decks early in the life of the structures, but the decks remained in good condition throughout the evaluation period. It was concluded that despite the poor coatings, the coated reinforcing steel contributed to the deck's durability by providing enhanced protection at critical cracked sections. Rebars taken from deck cores showed no signs of rusting, although the steel had a dull dark gray finish that may be underfilm corrosion. No debonding of the coating was evident.
Time-to-corrosion of Reinforcing Steel in Concrete Slabs: Calcium nitrite admixture or epoxy-coated reinforcing bars as corrosion protection systems
Author:
Publisher:
ISBN:
Category : Reinforced concrete
Languages : en
Pages : 94
Book Description
Publisher:
ISBN:
Category : Reinforced concrete
Languages : en
Pages : 94
Book Description
Mechanism of Corrosion of Epoxy-coated Reinforcing Steel in Concrete
Author: Alberto A. Sagüés
Publisher:
ISBN:
Category : Cathodic protection
Languages : en
Pages : 150
Book Description
Publisher:
ISBN:
Category : Cathodic protection
Languages : en
Pages : 150
Book Description
CRSI Performance Research
Author: Concrete Reinforcing Steel Institute
Publisher:
ISBN:
Category : Epoxy coatings
Languages : en
Pages : 22
Book Description
Publisher:
ISBN:
Category : Epoxy coatings
Languages : en
Pages : 22
Book Description
Report
Author:
Publisher:
ISBN:
Category : Highway research
Languages : en
Pages : 398
Book Description
Publisher:
ISBN:
Category : Highway research
Languages : en
Pages : 398
Book Description