Coating Performance on Existing Steel Bridge Superstructures PDF Download
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Author: R. Liu
Publisher:
ISBN:
Category : Chlorides
Languages : en
Pages : 41
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Book Description
Author: R. Liu
Publisher:
ISBN:
Category : Chlorides
Languages : en
Pages : 41
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Book Description
Author: Tom W. Neal
Publisher: Transportation Research Board
ISBN: 9780309061148
Category : Bridges
Languages : en
Pages : 100
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Book Description
This synthesis will be of interest to state department of transportation (DOT) bridge maintenance engineers, coating specialists, chemists, and researchers. Manufacturers and suppliers of corrosion protection products and systems for exposed structural steel on existing bridges will also find it of interest. This synthesis describes current practice regarding maintenance and protection strategies for exposed structural steel on existing bridges. NCHRP Synthesis 251, Lead-Based Paint Removal for Steel Highway Bridges ( 1997), provides a complementary and more in-depth treatment of maintenance issues involving lead-based paint removal. This report of the Transportation Research Board defines the maintenance management systems and decision making criteria used by transportation agencies for maintaining exposed bridge steel. Material selection criteria, surface preparation and application practices, quality control and quality assurance programs, and funding mechanisms are discussed in detail. The impact of recent and proposed environmental and worker protection regulations on current practice is reported. Information for the synthesis was collected by surveying state transportation agencies and by conducting a literature search. Responses to the survey, Appendix C to this document, are published on the Internet as NCHRP Web Document 11.
Author: Douglas D. Crampton
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 40
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Book Description
Weathering steel is commonly used as a cost-effective alternative for bridge superstructures, as the costs and environmental impacts associated with the maintenance/replacement of paint coatings are theoretically eliminated. The performance of weathering steel depends on the proper formation of a surface patina, which consists of a dense layer of corrosion product used to protect the steel from further atmospheric corrosion. The development of the weathering steel patina may be hindered by environmental factors such as humid environments, wetting/drying cycles, sheltering, exposure to de-icing chlorides, and design details that permit water to pond on steel surfaces. Weathering steel bridges constructed over or adjacent to other roadways could be subjected to sufficient salt spray that would impede the development of an adequate patina. Addressing areas of corrosion on a weathering steel bridge superstructure where a protective patina has not formed is often costly and negates the anticipated cost savings for this type of steel superstructure. Early detection of weathering steel corrosion is important to extending the service life of the bridge structure; however, written inspection procedures are not available for inspectors to evaluate the performance or quality of the patina. This project focused on the evaluation of weathering steel bridge structures, including possible methods to assess the quality of the weathering steel patina and to properly maintain the quality of the patina. The objectives of this project are summarized as follows: -- Identify weathering steel bridge structures that would be most vulnerable to chloride contamination, based on location, exposure, environment, and other factors. -- Identify locations on an individual weathering steel bridge structure that would be most susceptible to chloride contamination, such as below joints, splash/spray zones, and areas of ponding water or debris. -- Identify possible testing methods and/or inspection techniques for inspectors to evaluate the quality of the weathering steel patina at locations discussed above. -- Identify possible methods to measure and evaluate the level of chloride contamination at the locations discussed above. -- Evaluate the effectiveness of water washing on removing chlorides from the weathering steel patina. -- Develop a general prioritization for the washing of bridge structures based on the structure's location, environment, inspection observations, patina evaluation findings, and chloride test results.
Author: J. Peter Ault
Publisher:
ISBN: 9780309390361
Category : Iron and steel bridges
Languages : en
Pages : 75
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Book Description
Author: D. M. Berger
Publisher: ASTM International
ISBN: 9780803102361
Category : Coatings
Languages : en
Pages : 139
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Book Description
Author: Kenneth C. Clear
Publisher: Transportation Research Board
ISBN: 9780309053709
Category : Bridges, Iron and steel
Languages : en
Pages : 164
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Book Description
Author:
Publisher:
ISBN:
Category : Protective coatings
Languages : en
Pages : 109
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Book Description
Departments of Transportation currently use the conventional three-coat system as the predominant choice for the corrosion protection of steel bridge structures. Eliminating one step in the coating process could potentially save time and the cost associated with lane closures and traffic control costs. Available field performance data for the two-coat system, zinc-rich and a polysiloxane top coat, is somewhat limited. To set the stage for any potential field applications, a comprehensive testing approach is presented and conducted in this report. This experimental work evaluates several two-coat systems, based on the zinc-rich primer and polysiloxane top coat technology. All samples were conditioned and coated in a state-of-the-art, climate-controlled paint booth chamber, simulating common field environmental conditions (ENCON) (ENCON 1: 25 °C/50% RH, ENCON 2: 10 °C/40%RH, and ENCON 3 :32°C/80% RH). Severe accelerated weathering tests were performed on scribed and un-scribed panels. Test results include accelerated corrosion tests, dry film thickness, adhesion, chipping resistance, UV/Condensation, abrasion resistance, fresh and salt water immersion tests, and flexibility of the coating systems. Overall and regardless of the ENCON considered, the performance of the two-coat system is very comparable to the three-coat system. This coating technology offers much improved performance with quicker set time and better adhesion to steel structures. Considering the lower cost and ease of application, this two-coat system can be attractive to other Departments of Transportation and will enhance and extend the service life of the infrastructure assets.
Author:
Publisher:
ISBN:
Category : Highway research
Languages : en
Pages : 464
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Book Description
Author:
Publisher:
ISBN:
Category : Bridges, Iron and steel
Languages : en
Pages : 128
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Book Description
The recently promulgated environmental regulations concerning volatile organic compounds (VOC) and certain hazardous heavy metals have had a great impact on the bridge painting industry. As a response to these regulations, many of the major coating manufacturers now offer "environmentally acceptable" alternative coating systems to replace those traditionally used on bridge structures. The Federal Highway Administration sponsored a 7-year study to determine the relative corrosion control performance of these newly available coating systems. The most promising coating systems were selected for long-term field evaluation based on accelerated test performance. The long-term exposure testing was conducted for 5 years in three marine locations. Panels were exposed on two bridges, one in New Jersey and one in southern Louisiana. The third long-term exposure location was in Sea Isle City, New Jersey. Thirteen coating systems were included for long-term exposure testing.
Author: Clive H. Hare
Publisher: Van Nostrand Reinhold Company
ISBN:
Category : Bridges, Iron and steel
Languages : en
Pages : 328
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Book Description
Good,No Highlights,No Markup,all pages are intact, Slight Shelfwear,may have the corners slightly dented, may have slight color changes/slightly damaged spine.
