The Evaluation of Corrosion Inhibitors for the Repair and Rehabilitation of Reinforced Concrete Bridge Components PDF Download
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Author: Brian D. Prowell
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 432
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Book Description
Author: Brian D. Prowell
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 432
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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: Ali Akbar Sohanghpurwala
Publisher: Transportation Research Board
ISBN: 0309098629
Category : Bridges, Concrete
Languages : en
Pages : 72
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Book Description
Author:
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 136
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Book Description
This report describes a technology review, field surveys, and laboratory investigations into the corrosion of prestressed concrete highway bridge elements and conventional repair methods used for these structures. Details of the technology review and field surveys are given in an Interim Report (FHWA-RD-95-041). Subsequent to completion of the field surveys, a laboratory program designed to evaluate corrosion performance of conventional concrete repair materials was initiated. Test specimens were precorroded by application of anodic current while exposed to chloride solutions. In order to study conventional concrete repairs, it was necessary to remove concrete from preselected areas on each purposely corroded test specimen and replace the chloride-contaminated/deteriorated original concrete with repair materials. Materials evaluated included conventional portland cement concrete, latex-modified fiber-reinforced patching mortar, and silica fume concrete containing either organic or inorganic corrosion inhibitors. Specimens where concrete was not removed were used to study the effects of sealers and coating applied on concrete surfaces to mitigate ongoing corrosion. All specimens were exposed for approximately 200 weeks to a 15% solution of sodium chloride after repair. At the conclusion of exposure, patches were removed from repair specimens and the steel and the applied coatings were examined.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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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: M Raupach
Publisher: Woodhead Publishing
ISBN: 1845692284
Category : Technology & Engineering
Languages : en
Pages : 337
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Book Description
Given the widespread use of reinforced concrete in infrastructure, understanding the corrosion of this material is of major importance. As a result there has been a wealth of research into catalysts, inhibitors and effective means of monitoring the rate of corrosion. Corrosion of reinforcement in concrete: mechanisms, monitoring, inhibitors and rehabilitation techniques summarises some of the most significant research and its implications.The book begins by reviewing findings from various experiments designed to test the corrosion rate of metals induced by a range of factors. Later chapters discuss techniques for monitoring and testing for corrosion. The book concludes by assessing important methods of prevention, including corrosion inhibitors, protective coatings and electrochemical methods for protection, together with rehabilitation procedures for susceptible structures.Filled with practical examples and written by a distinguished team of international contributors, Corrosion of reinforcement in concrete: mechanisms, monitoring, inhibitors and rehabilitation techniques is an essential reference for civil engineers using reinforced concrete. Summarises research into catalysts, inhibitors and effective means of monitoring the rate of corrosion Concludes by assessing important methods of prevention
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Deicing salts and salt-water spray can cause serious corrosion problems for reinforced concrete bridge structures. These problems can lead to costly and labor intensive repair and even replacement of the structure. Surface applied corrosion inhibitors are potentially a useful and cost effective way to prolong the life of existing structures. The purpose of this research project was to evaluate the effectiveness of commercially available corrosion inhibitors for surface treatments of existing reinforced concrete bridges. Reinforced concrete specimens were cast with different levels of initial chloride contents, coated with one of six products tested, and placed in accelerated corrosion environments. Each manufacturer donated their corresponding products for use in the experiment. The manufacturers were also given the test matrix and parameters in advance of the product application and invited to participate in the application process. Environmental conditions, voltmeter, and half cell potential readings were taken on a weekly basis in accordance with ASTM standards. Intermittently, some of these specimens were removed from their environments and evaluated on a visual, mass loss, strength loss, and chloride content basis. This data was then compiled and compared to each other and to control specimens located in a non-corrosive environment. It was found that surface applied corrosion inhibitors delay the onset of corrosion and the speed of the corrosion process. It was also found that a maximum chloride content of 0.5% by cement weight exists beyond which none of the inhibitor products were useful. Suggestions for further research in this area of study are also included.
Author: J. Mietz
Publisher: CRC Press
ISBN: 1000122433
Category : Science
Languages : en
Pages : 226
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Book Description
This book compiles the full papers presented in the successful session "Corrosion of Steel in Concrete" at EUROCORR '97. It highlights the areas of technical development in this field, including monitoring of steel reinforcement corrosion, prevention of corrosion and electrochemical repair methods.
Author: Bernhard Elsener
Publisher: CRC Press
ISBN:
Category : Business & Economics
Languages : en
Pages : 84
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Book Description
The use of inhibitors for rehabilitation of reinforced concrete structures is a new field of application and this new volume provides a State of the Art Report on this subject. Corrosion of steel in concrete is one of the major problems for infrastructure such as bridges, tunnels, housing etc. since it leads to spalling of the concrete and loss in cross section of the steel that may cause structural and safety problems. The steel in concrete generally resists corrosion as a result of a passive layer that develops on the metal surface in the alkaline environment of the concrete. Corrosion can occur if these conditions are disturbed, for example, in the presence of chlorides or with carbonation of concrete. Traditional repair methods consist in removing the deteriorated concrete and replacing it but these can be laborious, noisy and very costly. To avoid these disadvantages new methods have been developed in recent years. These include electrochemical procedures and, increasingly, the use of inhibitors. The use of inhibitors for rehabilitation of reinforced concrete structures is a new field of application and this new volume provides a State of the Art Report on this subject.The report, under the editorship of Prof. Bernhard Elsener, was prepared by a Task Group of the EFC Working Party on Corrosion of Reinforcement in Concrete. In a literature review it describes inorganic and organic chemicals that have been proposed and examined as well as the commercial corrosion inhibitors that are available on the market. Protection mechanism and possible effects of inhibitors on concrete properties are described. Practical experience with inhibitors for steel in concrete and the long term effectiveness are considered. The various test methods for evaluating the behaviour of the inhibitors are described and critically assessed. In a rapidly evolving field this State of the Art Report, based mainly on independent not commercial literature, will be of value to corrosion engineers and civil engineers concerned with maintenance and repair of reinforced concrete structures.
