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Bridge construction utilizing post-tensioned (PT) tendon systems have become increasingly popular. 1-2 PT construction allows engineers greater options for the design of highway bridges and provides efficient structures with advantages in construction, economy, and serviceability. In bonded post stresses to the reinfotensioned systems, the introduction of rced concrete element is made through tensioned highstrength steel strand that are anchored and encapsulated in a cementitious grout within a tendon.3-4 The hardened grout allows development of the stress along the length of the tendon and also provides corrosion protection by the presence of the alkaline pore water to passivate the steel strand and by creating a barrier from external contaminants.
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The 2014 US bridge inventory lists over 610,000 highway bridges. Industry experts believe that the cost of maintaining those bridges for repairs due to corrosion is at least $30 billion annually. Bridge owners do not have the resources to maintain bridges in good condition. New bridges are being constructed, at the rate of approximately 3,000 nationally each year. Those new bridges must not pose additional maintenance burdens on the already inadequate bridge maintenance budgets.
Waterborne polyurethane coatings have been used in the bridge preservation market for years as an alternative to solvent borne systems but early technologies required the bridge coatings engineer to compromise on properties or durability. Additionally, many of these early products still contained high levels of VOC although touted as waterborne technology. New alternatives have evolved that address these issues and fit well into an overall sustainability plan.
The corrosion profession, and the certified professionals who work in the industry, are committed to protecting people, assets, and the environment from the effects of corrosion. Those tasked with delivering the technical expertise to society must conduct their work with the knowledge and understanding of the ethical principles expected and required of those professionals.
The AMPP Code of Ethics is discussed in conjunction with relevant case studies and features real-life ethical violations of the AMPP attestations. Frameworks for making ethical decisions are also reviewed in this course along with the factors in the corrosion industry that can lead to unethical behavior.
This is an online, self-paced course which should take 1.5 to 2 hours to complete. After you have purchased the course in the store, log into your AMPP profile and select “Online Courses” to begin.
Purchase of this course includes a one-year subscription and is non-refundable. Students will have access to all course materials for a period of one year from the date of registration. All course work must be completed during this time period. Extensions or transfers cannot be granted.
Corrosion of steel in reinforced concrete bridges is a major concern for the structural integrity, long-term durability, and maintenance of the highway infrastructure. Statistics from a national study in 2002 indicated that approximately 15% of the national bridge inventory is structurally deficient because of corrosion and the national annual direct cost exceeded $8 billion.1 In the state of Florida, the typical design life expectation for the >6,000 bridges in the state highway infrastructure exceed 75 years.
The FHWA 100-year coating study was initiated in August 2009. The objective of this study is to identify and evaluate coating materials that can provide 100 years of maintenance-free service life for steel bridges.
To encourage bridge owners to implement a well-planned effort to control corrosion rather than perform necessary repairs after a structure has suffered critical damage and cannot be ignored any longer. 2011r
ANSI/NACE MR0175/ISO 15156 standard in context of the corrosion science and the forms of cracking that led to its development. Usage. User Support. Documents. Laboratory tests to confirm cracking resistance of materials in O & G environments. 2016 NACE E-BOOK
Using climate control proved its “cool” during a major, temperature sensitive construction project for the Charles-de-Gaulles Bridge Project between Montreal and Repentigny Canada. The air treatment company teamed with general contractor firm Construction Injection EDM Inc and Versailles 48 Inc. the coating contractor to successfully control the temperature and humidity of the containments on the underside of the bridge during a challenging retrofit and application of protective coatings of the steel structure.
Overcoating and other maintenance painting practices of the Texas Department of Transportation are discussed.
A preliminary research to identify the possible susceptibility of a case study marine bridge infrastructure to MIC is the main objective. This will be supported by determining the bacteria, nutrient levels, environmental conditions and other factors that could support MIC.