Structures in direct contact with coastal waters experience
corrosion activity around the tidal and splash zone areas.
Uncontrolled corrosion of reinforcing steel and prestressing
strands in marine structures can decrease the life expectancy
of a structure to a fraction of its design life.
Many of Florida’s coastal structures suffer from premature
deterioration of substructure elements. The reinforcing steel
or prestressing strands do not have a protective coating and
overdriving of concrete piles during construction caused
hairline cracks in the concrete that serve as a direct path for
moisture, oxygen and chlorides to reach the reinforcing steel.
Faced with this deteriorating condition, the Florida Department
of Transportation (FDOT) aggressively implemented a corrosion
protection program to mitigate the corrosion process of
substructure elements. Both impressed current and galvanic
cathodic protection systems have been regularly installed
since 1991, and as of today approximately 40 impressed current
systems have been installed on coastal bridges on both the
east and west coasts and throughout the Florida Keys.
Because impressed current systems require a low voltage DC
power supply to be constantly on for the system to function
properly, monitoring is required. The travel distance from the
FDOT Corrosion Lab in Gainesville to various sites for monitoring
proved overwhelming after a few years, so the decision was
made to invest and install remote monitor units at all sites.
Remote monitors allow engineers to access the rectifier and
other equipment from anywhere with an internet connection.
As the number of installations grew, so did the number of
remote monitors and the need to outsource the monitoring
and maintenance of the systems. The FDOT awarded Corrpro
a two-year contract beginning in July 2015 to perform this
work. Under this contract, engineers from Corrpro’s Florida
office perform the following scope of services:
- Monthly remote monitoring and reporting of all sites statewide
- Maintaining and upgrading the website for accessing the sites
- Visiting sites to maintain and upgrade equipment
- Developing and installing new remotely-controlled equipment
such as cameras, weather stations, scour monitors, tide
elevation, etc., that can be used by engineers to assess
Corrpro currently manufactures and supplies the
materials and equipment used today on FDOT impressed
current system such as anodes, reference electrodes,
rectifiers and remote monitors.