Evaluation of Selected Repair Methods for Chloride-included Corrosion Damaged Reinforced Concrete Railway Bridges PDF Download
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Author: Mohamed Jogiat
Publisher:
ISBN:
Category : Concrete construction
Languages : en
Pages : 232
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Book Description
Author: Mohamed Jogiat
Publisher:
ISBN:
Category : Concrete construction
Languages : en
Pages : 232
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Book Description
Author: Habib Tabatabai
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 376
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Book Description
Author: Ali Akbar Sohanghpurwala
Publisher: Transportation Research Board
ISBN: 0309098629
Category : Bridges, Concrete
Languages : en
Pages : 72
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Book Description
Author: Moavin Islam
Publisher: DIANE Publishing
ISBN: 1428995242
Category : Concrete bridges
Languages : en
Pages : 58
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Book Description
The primary objective of the project was to determine the effectiveness of cathodic protection, electrochemical chloride extraction, and corrosion-inhibitor treatment systems installed during the SHRP effort through the long-term evaluation of 32 field test sites and a number of laboratory concrete slab specimens. The FHWA program required monitoring the long-term performance of corrosion inhibitor treatments on selected components of four bridges that were treated and evaluated under SHRP C-103. Three evaluations over a period of 5 years were conducted on structures located in Minnesota, New York and Pennsylvania, and two evaluations were conducted on a structure in Washington State. An analysis of the results concluded that neither of the corrosion inhibitors evaluated in this study, using the specified repairs and exposed to the specific environments, provided any corrosion-inhibiting benefit. Shrinkage cracking plagued repairs at all test sites except for the Washington site.
Author: Stephen E. Herald
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 155
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Book Description
This report deals with the selction of a method and the development of detailed procedures to accurately measure the chloride content of reinforced concrete in the field. Specific ion probe, spectrophotometer, digital titrator, and quantab titrator stips were the methods investigated. Results from laboratory procedures and evaluation based on cost, speed accuracy, and levels of required expertise indicated that the specific ion probe was more suitable for use in the field than the other methods selected. Field validation testing was done to substantiate laboratory findings. Guidelines were produced for the instrumentation, digestion solution, and test procedure. The enhanced procedures were evaluated.
Author: Michael S. Murphy
Publisher:
ISBN:
Category : Chlorides
Languages : en
Pages : 155
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Book Description
Reinforced concrete bridge substructures in Minnesota and other northern climates possess an elevated risk for chloride induced corrosion damage, which can reduce capacity and shorten service life. Research was performed in 1997 to investigate new strategies for corrosion mitigation, including electrochemical chloride extraction (ECE) and installation of fiber reinforced polymer (FRP) wrap, which were applied on several corrosion-damaged piers on a 30-year-old bridge in Minneapolis. This report presents the results of follow-up research performed to assess the condition of the treated piers after 20 additional years of service, in order to understand the long-term effectiveness of the strategies implemented. The combination of ECE treatment and FRP wrap installation was found to be very effective, with no concrete distress or probable corrosion activity identified in the treated elements. Poor or mixed performance was observed with all other strategies, including both ECE treatment followed by application of a penetrating sealer and FRP wrap installation that was not accompanied with ECE. In addition, significant chloride contamination occurred in all of the subject piers within the 20 years since the initial study, indicating that neither FRP wrap nor concrete sealers prevented the ingress of new chlorides in the manner in which these systems were installed in the initial study. The findings indicated that performing ECE treatment, or installing FRP wraps, did not alone eliminate the risk of future corrosion activity. The most effective corrosion mitigation strategy to extend the service life of reinforced concrete bridge substructures was to minimize water and chloride exposure.
Author: Peter Pullar-Strecker
Publisher: Spon Press
ISBN:
Category : Concrete
Languages : en
Pages : 120
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Author: Kenneth C. Clear
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 52
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Author: Jennifer L. Kepler
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 244
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Book Description
Since the 1970s, research projects and field studies have been conducted on different methods for protecting reinforced concrete bridges from corrosion damage. The methods include alternative reinforcement and slab design, barrier methods, electrochemical methods, and corrosion inhibitors. Each method and its underlying principles are described, performance results of laboratory and/or field trials are reviewed, and systems are evaluated based on the results of the trials. Using performance results from the studies and costs obtained from transportation agencies, an economic analysis is used to estimate the cost of each system over a 75-year economic life using discount rates of 2%, 4% and 6%.
Author: George O. Shanafelt
Publisher: Transportation Research Board National Research
ISBN: 9780309030328
Category : Concrete bridges
Languages : en
Pages : 66
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