Materials Performance

AUG 2018

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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38 AUGUST 2018 W W W.MATERIALSPERFORMANCE.COM CATHODIC & ANODIC PROTECTION O At approximately 663,000 mi 2 (1.7 mil- lion km 2 ) and over twice the size of Texas, Alaska is by far the largest state in the United States. Due to its vast- ness, Alaska is home to several dis- tinct environments, with each pre- senting its own challenges when designing for corrosion control. Be- yond the environment, population sparsity and remoteness provide ad- ditional obstacles. These challenges, both technical and nontechnical, shape the strategies employed by lo- cal agencies and engineers in creat- ing their plans for asset management, durability, and sustainability. This ar- ticle examines these obstacles and corresponding strategies through specific case examples. "Our nation's aging infrastructure" is an oft-uttered phrase by media pundits, politi- cians, and everyday citizens. The phrase is typically followed by plans for new struc- tures, complaints about spending (whether it's spending too much or not enough), or a general statement about how the extremely va gu e "s om ethin g " n e ed s to b e don e. Ultimately, the task of defining and imple- menting the "something " falls to federal, state, and local government agencies as part of their asset management programs. These asset management programs face many obstacles for achieving success, which include technical obstacles such as attempting to rehabilitate existing struc- tures and assets to meet the demands of increasing population densities, as well as nontechnical obstacles like budget restric- tions, lack of qualified contractors or engi- neers, and internal knowledge loss from retiring employees. The State of Alaska is no different in these regards, but it does face many additional obstacles, which include extreme climates, limited access to remote areas, and low population densities. The fol- lowing case examples describe common corrosion problems faced by Alaskan agen- cies and methods that were used to mitigate those problems in a variety of locations and climates across Alaska (Figure 1). Case Example 1—Cruise Ship Terminal and Seawall Corrosion Repairs Southeast Alaska is characterized by its numerous islands and inlets, temperate rain forests that can average over 150 in (3,810 mm) of rainfall annually, and moun- tains that reach straight into the sea. The natural beauty inherent in this environ- ment drives over a million tourists to the region every year. Most of them arrive via cruise ships, making cruise ship terminals vital structures for the economic health of many southeast Alaskan cities. The City of Juneau's Steamship Wharf and adjacent Marine Park serve as a hub for the city's cruise ships and tourist industry. These structures are a combination of wood, steel, and concrete elements, and range in age from less than one year to sev- eral decades. As part of the city 's mainte- nance plan, they are currently in the final year of extensive corrosion repairs and upgrades that began with initial corrosion remediation recommendations in 2010 and construction in 2016. Corrosion in Alaskan Infrastructure Ryan Tinnea and Madeline l ee, Tinnea & Associates, Seattle, Washington, USA e R ich Schaal , City and Borough of Juneau, Docks and Harbors, Juneau, Alaska, USA

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