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The presentation will discuss the challenges, overall objective and unique characteristics of the viscous-elastic semi-solid compound and bolt cap protection system. Testing, installation procedures and previous projects will be covered. One of the projects to be covered is the system used to protect the support rods of the recently constructed San Francisco Bay Bridge connecting Oakland to San Francisco. The bridge made the news prior to opening when it was determined that a portion of the support rods were experiencing fatigue and showing signs of premature failure.
Details of a new protocol for evaluating the effectiveness of coatings to reduce corrosion of steel structures is presented in this paper. Basic concepts of accelerated testing specified in American Society for Testing Materials (ASTM) standards and recent research investigations were used to develop a procedure that can provide conclusive results within 2400 hours of exposure as compared to more than 5000 hours in current practices.
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Blistering is a common failure in marine coatings that can be caused by both physical, such as osmotic pressure and temperature gradients, and electrochemical forces like cathodic or anodic polarization. This paper/presentation will start by discussing the various mechanisms that lead to coating blistering, how blisters form, and how to prevent them.
This paper will describe this commonplace corrosion problem associated with protective coating damage at dissimilar metal bolted connections and present a typical case history. The paper will go on to explain why slotted bolt holes are more susceptible to more aggressive corrosion damage than round bolt holes. In addition, the paper will present successful measures that can be taken to prevent this prevalent problem.