Long-term Effects of Cathodic Protection on Prestressed Concrete Bridge Components PDF Download
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Author:
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Category :
Languages : en
Pages : 110
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Author:
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ISBN:
Category :
Languages : en
Pages : 110
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Author: William Handy Hartt
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 124
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While cathodic protection effectively reduces or stops ongoing corrosion of reinforcing steel in concrete, applicability of this technology to prestressing steel has been limited because of concerns of possible bond loss and hydrogen embrittlement. Within this context the present research was intended as a comprehensive, multifaceted undertaking to elevate the understanding of prestressed concrete cathodic protection to the same level as for reinforced concrete. The experimental part of the program involved three approaches: 1) constant extension rate tests (CERT) upon straight tendon wire, 2) monitoring of cathodically polarized prestressed beams for both bond loss and hydrogen embrittlement, and 3) concrete block pullout tests involving both tendon and wire.
Author: United States. Federal Highway Administration
Publisher:
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Category : Concrete bridges
Languages : en
Pages : 4
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Author:
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ISBN:
Category : Concrete bridges
Languages : en
Pages : 84
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While cathodic protection effectively reduces or stops ongoing corrosion of reinforcing steel in concrete, applicability of this technology to prestressed members has been limited because of concerns regarding possible bond loss and hydrogen embrittlement. Within this context, the present research was intended as a comprehensive, multifaceted undertaking to elevate the understanding of prestressed concrete cathodic protection to the same level as for reinforced concrete. The program involved four components: (1) constant extension rate testing (CERT) of precorroded tendon wires, (2) cathodic overprotection of precorroded, pretensioned beams with evaluation for hydrogen embrittlement susceptibility, (3) concrete block pull-out tests to determine any effect of cathodic protection on the tendon-to-concrete bond, and (4) evaluation of a commercially available remote monitoring and control hardware and software system for application to prestressed concrete cathodic protection.
Author:
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Category : Cathodic protection
Languages : en
Pages : 80
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This is the final report in a study to demonstrate the feasibility of using cathodic protection (CP) on concrete bridge structures containing prestressed steel. The interim report, FHWA-RD-95-032, has more details on the installation of selected CP systems. Past laboratory and test yard studies had indicated that overprotection could result in the evolution of atomic hydrogen and the embrittlement of prestressing steel. Systems utilizing catalyzed titanium mesh, conductive rubber, and arc-sprayed zinc anodes were installed on prestressed pilings and girders of the Howard Frankland Bridge in Tampa, Florida; and systems using flame-sprayed zinc and conductive paint anodes were installed on the soffit of prestressed box beams of the Abbey Road and West 130th Street bridges near Cleveland, Ohio. For most of the components tested, CP was achieved safely and reliably without reaching conditions that could result in embrittlement of prestressed steel.
Author: Moavin Islam
Publisher: DIANE Publishing
ISBN: 1428995242
Category : Concrete bridges
Languages : en
Pages : 58
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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: David G. Enos
Publisher:
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Category :
Languages : en
Pages :
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Author: Ali Akbar Sohanghpurwala
Publisher: Transportation Research Board National Research
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 60
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At head of title: National Cooperative Highway Research Program.
Author:
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ISBN:
Category :
Languages : en
Pages : 108
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ISBN:
Category :
Languages : en
Pages : 148
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