Chloride Removal and Monomer Impregnation of Bridge Deck Concrete by Electro-osmosis PDF Download
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Author: Garrett L. Morrison
Publisher:
ISBN:
Category :
Languages : en
Pages : 38
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Book Description
Author: Garrett L. Morrison
Publisher:
ISBN:
Category :
Languages : en
Pages : 38
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Book Description
Author:
Publisher:
ISBN:
Category : Polymer-impregnated concrete
Languages : en
Pages : 48
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Book Description
Author: Waterways Experiment Station (U.S.) Structures Laboratory
Publisher:
ISBN:
Category : Hydraulic engineering
Languages : en
Pages : 616
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Book Description
Author:
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 68
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Book Description
Chloride ion from bridge deck concrete can be removed by application of a direct current potential between bridge reinforcing steel( - ) and a copper screen(+) conductor on the bridge surface. Soaring prices of all types of energy would make removal of all chloride prohibitatively expensive. The importance of verification of all electrical connections prior to the treatment is emphasized by the demonstration of concrete cracking when the steel was made a positive instead of a negative electrode.
Author: G. P. Mallett
Publisher: Thomas Telford
ISBN: 9780727720078
Category : Technology & Engineering
Languages : en
Pages : 216
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Book Description
Provides a review of the repair, maintenance and protection of concrete bridges. This book summarizes information from conference papers, research and technical reports, and others. It aims to increase the expertise of structural engineers and safeguard the investment. It presents solutions to the problems and pitfalls that engineers encounter.
Author: United States. Federal Highway Administration. Offices of Research and Development
Publisher:
ISBN:
Category :
Languages : en
Pages : 704
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Book Description
Author: Enric Vázquez
Publisher: RILEM Publications
ISBN: 9782912143525
Category : Building materials
Languages : en
Pages : 582
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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: John P. Broomfield
Publisher: CRC Press
ISBN: 0203414608
Category : Architecture
Languages : en
Pages : 294
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Book Description
Corrosion of Steel in Concrete provides information on corrosion of steel in atmospherically exposed concrete structures and serves as a guide for those designing, constructing and maintaining buildings, bridges and all reinforced concrete structures. This new edition incorporates the new European standards as well as USA and other international standards. It also covers developments in galvanic and impressed current cathodic protection, new electrochemical techniques such as electro-osmosis, and stainless steel clad reinforcing bars. The corrosion of reinforcing steel in concrete is a major problem facing civil engineers and surveyors throughout the world today. There will always be a need to build structures in corrosive environments and it is therefore essential to address the problems that result. This is a book to educates about and forms a guide to the problems of corrosion, its causes and how to find solutions.
Author: Gerardo G. Clemeña
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 38
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Book Description
A recent SHRP study confirmed that applying an electrical field between the surface of a concrete structure and the rebars (like cathodic protection, except with 50 to 500 times more current) can expel the chloride ions from salt-contaminated reinforced concrete and mitigate rebar corrosion. This new rehabilitation method was tried on two whole deck spans, as part of pilot trials in Virginia to demonstrate the practicality of this electrochemical chloride extraction (ECE) process on full-sized bridge elements and to help refine the technique. The total concrete area treated was approximately 720 m 2 (7,750 ft2). To avoid traffic interruption, half of the deck was treated at a time (for 8 weeks, though a shorter time would likely suffice). The treatment used a very simple installation and procedure, involving placement of a temporary electrolyte-soaked anode system (of inert catalyzed titanium mesh sandwiched between two layers of felt) on the surface of the deck, and the application of total charges that varied between 741 to 1,077 A-hr/m 2 (68.8 to 100.1 A-hr/ft 2) in 57 to 58 days between the anode and the rebars. Approximately 72.2 to 82.1% of the initial chloride ions were removed from the concrete in various depths. These magnitudes surpassed the removal rate of 40 to 50% that was suggested for very heavy treatment by one SHRP report. A minor rectifiable difficulty was encountered in neutralizing the acidity generated in the electrolyte, especially during the first several days of each treatment phase. Lithium was used in the electrolyte for two portions of the deck and was observed to migrate readily into the concrete. However, a similar attempt to simultaneously inject a cationic corrosion inhibitor (tetraphenylphosphonium) into the concrete, which represented a first attempt ever on a concrete deck, yielded uncertain results. It is uncertain whether the corrosion inhibitor had migrated into the concrete; if it had, it was in quantities less than the minimum detection level of 25 ppm, by the capillary electrophoresis method used. Overall, the pilot treatment of the deck was judged to be very simple to perform and more than reasonably successful.
