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Author:
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 26
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Book Description
Epoxy coated deck reinforcement was evaluated during the construction of two bridges on Rte. I-77 in Carroll County. The contractor was favorably impressed with the coated steel, which sustained no damage during shipping or deck construction. Among the data collected were resistivity and potential readings, initial chloride contents of the deck concrete, and unit costs. It appears that the epoxy coatings had many small bare spots and other flaws that were not effectively patched at the site. Further evaluations after the bridges are opened to traffic and subjected to applications of deicing salts are recommended.
Author:
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 26
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Book Description
Epoxy coated deck reinforcement was evaluated during the construction of two bridges on Rte. I-77 in Carroll County. The contractor was favorably impressed with the coated steel, which sustained no damage during shipping or deck construction. Among the data collected were resistivity and potential readings, initial chloride contents of the deck concrete, and unit costs. It appears that the epoxy coatings had many small bare spots and other flaws that were not effectively patched at the site. Further evaluations after the bridges are opened to traffic and subjected to applications of deicing salts are recommended.
Author: Stephen R. Sharp
Publisher:
ISBN:
Category : Epoxy coatings
Languages : en
Pages : 30
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Book Description
This study evaluated two half-cell mapping methods for nondestructive evaluation of epoxy-coated rebar (ECR) in concrete: the semi-fixed bi-electrode and the moving bi-electrode methods. These methods were expected to provide early detection of corrosion-related damage and ensure adequate time for repair. The techniques were evaluated by comparing the half-cell measurements using the two half-cell mapping techniques and measurements using the standard half-cell technique. The study found that in concrete specimens the response of both bi-electrode techniques was similar to that of the standard half-cell technique. Each technique was sensitive enough to distinguish between ponded and unponded regions along the Type I test beams. Although additional research is required to determine exactly how sensitive either bi-electrode technique is for assessing corrosion of ECR in concrete, it is clear that the use of any nondestructive tool for condition surveys of bridge decks would benefit VDOT and Virginia. The author recommends that the Type I test beams used in this study continue to be ponded until corrosion is initiated to aid in understanding the benefit of using the two bi-electrode methods during the various stages of corrosion. In addition, the Virginia Department of Transportation's Structure & Bridge Division should identify two structures that are beginning to show signs of corrosion, one bridge with ECR and the other with bare bar, to be used in a field study to determine if either bi-electrode method would benefit VDOT as a condition survey tool.
Author: Satinder K. Munjal
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 131
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Book Description
Author: David B. McDonald
Publisher:
ISBN:
Category : Epoxy coatings
Languages : en
Pages : 148
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Book Description
This report describes the work conducted from 1993 to 1998 to develop cost-effective "new breeds" of organic, inorganic, ceramic and metallic coatings, as well as metallic alloys that can be utilized on or as reinforcement for embedment in portland cement concrete. As part of the study, 12 different bar types were tested in concrete: black bars, 3 bendable and 3 nonbendable epoxies, Type 304 and Type 316 stainless steel, copper-clad, galvanized and spray metallic-clad reinforcing. Measurements of macrocell voltages, half-cell potentials, electrochemical impedance spectroscopy, linear polarization and mat-to-mat resistances were used in conjunction with visual observations to determine the effectiveness of each system.
Author: Kenneth C. Clear
Publisher: Transportation Research Board
ISBN: 9780309053709
Category : Bridges, Iron and steel
Languages : en
Pages : 164
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Book Description
Author: Satinder K. Munjal
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 131
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Book Description
Author: Alphonso Mulbah Kolliesuah
Publisher:
ISBN:
Category :
Languages : en
Pages : 216
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Author: David B. McDonald
Publisher:
ISBN:
Category : Corrosion resistant materials
Languages : en
Pages : 38
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Book Description
Author: Wallace T. McKeel
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 28
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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.
Author:
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 4
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Book Description
