Accession Number : AD1049256

Title :   In-Situ Subsurface Coating of Corroded Steel Sheet Pile Structures: Final Report on Project F08-AR06

Descriptive Note : Technical Report

Corporate Author : ERDC-CERL CHAMPAIGN United States

Personal Author(s) : Beitelman,Alfred D ; Lampo,Richard G ; Clark,Lawrence ; Butler,Dave ; Van Draege,Eric ; Rozene,David

Full Text :

Report Date : 01 Sep 2017

Pagination or Media Count : 142

Abstract : The Department of Defense (DoD) spends over $100 million annually maintaining and repairing waterfront infrastructure, including corroded steel sheet pile structures located in warm, salt-water immersion and areas susceptible to accelerated low-water corrosion. Once designed as temporary structures, many now support permanent requirements and must be repaired in place. Conventional underwater repairand coating operations are accomplished by specialized divers at very high cost. This project investigated a cost-saving emerging technology called a limpet cofferdam, which is readily positioned below the waterline to provide workshop-like conditions for repair technicians, and is rapidly movable along submerged sheet pile structures. Also demonstrated was a highly durable, single-coat amine epoxy system that fully cures in immersion. Limpet deployment and dewatering was completed in 30 minutes or less, and leaks into the workspace through damaged sheet pile were sealed in 530 minutes, depending on perforation size and other variables. The coating was found to be readily sprayable with only minimal pinholing, and fully cured under water. Literature indicates that this coating can be expected to have a 25-30 year service life. The calculated return on investment for these technologies is 14.70, with higher potential return when planning includes the recommended site-assessment methods.

Descriptors :   pile structures , corrosion , protective coatings , maintenance , repair , department of defense , WATERFRONT STRUCTURES , SEA WATER CORROSION , steel , ENVIRONMENTAL STRESS CRACKING , STRESS CORROSION

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE