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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Author(s)
Luis Osmel Millan Solorzano
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DOI:10.17265/1934-7359/2018.01.004
Affiliation(s)
Department, Millan Engineering, San José, 30303, Costa Rica
ABSTRACT
In Quepos, Pacific of Costa
Rica, it was finished on 2010 the first phase of a marina, including two mix
breakwaters, with rubble mound (rocks and concrete units), and 25 circular
steel sheet piles cofferdam cells, filled with sand and gravel. The maintenance
plan, considers tracking sheet pile corrosion, comparing “actual” against expected
rates, checking structural limits, and programming countermeasures if
accelerated corrosion is identified. Specific control sections, along the
breakwaters, both inside and outside the basin, were established. In each section,
thicknesses were measured every meter from the top of the steel cell to seabed
using an ultrasonic equipment, and an underwater transducer. Both land crew,
and divers for submerged portions, were used. The measurements campaigns are
for several years from 2011 to 2016. Sectors of the breakwater with varied
corrosion attack levels could be differentiated. Also, corrosion rates and
lifespans were estimated, both general for the structures, and specific for
each section and level. In turn, this allowed to identify maintenance
priorities, defining sites where measures of corrosion protection should
initiate, as well, to have confidence in the structural capacity and safety of
the breakwaters.
KEYWORDS
Monitoring of structures, maritime works, sheet piling, corrosion, ultrasonic thickness measurements.
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