Electro-osmotic Techniques for Removal of Chloride from Concrete and for Emplacement of Concrete Sealants PDF Download
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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:
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: John Newman
Publisher: Elsevier
ISBN: 008052656X
Category : Architecture
Languages : en
Pages : 1920
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Book Description
Based on the Institute of Concrete Technology's advanced course, this new four volume series is a comprehensive educational and reference resource for the concrete materials technologist. An expert international team of authors from research, academia and industry has been brought together to produce this unique reference source. Each volume deals with different aspects of the properties, composition, uses and testing of concrete. With worked examples, case studies and illustrations throughout, this series will be a key reference for the concrete specialist for years to come. Expert international authorship ensures the series is authoritative Case studies and worked examples help the reader apply their knowledge to practice Comprehensive coverage of the subject gives the reader all the necessary reference material
Author: John Newman
Publisher: Elsevier
ISBN: 0080489990
Category : Technology & Engineering
Languages : en
Pages : 317
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Book Description
Based on the Institute of Concrete Technology's Advanced Concrete Technology Course, these four volumes are a comprehensive educational and reference resource for the concrete materials technologist. An expert international team of authors from research, academia and industry has been brought together to produce this unique series. Each volume deals with a different aspect of the subject: constituent materials, properties, processes and testing and quality. With worked examples, case studies and illustrations throughout, the books will be a key reference for the concrete specialist for years to come. Expert international authorship ensures the series is authoritative Case studies and worked examples help the reader apply their knowledge to practice Comprehensive coverage of the subject gives the reader all the necessary reference material
Author: Institution of Civil Engineers (Great Britain)
Publisher: Thomas Telford
ISBN: 9780727716354
Category : Technology & Engineering
Languages : en
Pages : 468
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Book Description
The level of research activity in the highway sector as a whole has declined precipitously in recent decades, whilst the challenges facing US state highway agencies have escalated. As a result, a Strategic Highway Research Program - SHRP) was initiated to establish collaboration with research bodies tackling similar highway problems in countries worldwide. This collection of reports from around the world presents SHRP`s progress towards providing research-based new products from which the international highway engineering community may benefit. SHRP concentrates on six high-priority research areas: asphaltic materials; pavement performance; cement and concrete; maintenance cost effectiveness; concrete bridge component protection systems and the chemical control of snow and ice.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1368
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Book Description
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.
Author:
Publisher:
ISBN:
Category : Highway research
Languages : en
Pages : 562
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Book Description
Author: Garrett L. Morrison
Publisher:
ISBN:
Category :
Languages : en
Pages : 38
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Book Description
Author: Garrett L. Morrison
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 44
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Book Description
Describes a simple and inexpensive procedure developed to determine the "relative permeability" of concrete.
Author:
Publisher:
ISBN:
Category : Polymer-impregnated concrete
Languages : en
Pages : 48
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Book Description
