vector corrosion services - Projects
Vector Corrosion Services (VCS) has successfully provided solutions for asset managers facing corrosion and concrete durability concerns. Here are projects that we have completed that include investigation, corrosion engineering, and cathodic protection design services for infrastructure and building assets.
Portsmouth Memorial Bridge Micropile CP
Project Name: Portsmouth Memorial Bridge Micropile Sacrificial Anode System
Structure: Portsmouth Memorial Bridge
Location: Portsmouth, NH
Client: New Hampshire Department of Transportation
Technologies: Cathodic Protection Design
Project Issues: Design and Implementation of Cathodic Protection System
Project Date: April 2014
Contractor: Archer Western Contractors
Vector Corrosion Services (VCS) conducted a corrosion evaluation and cathodic protection (CP) design for the Portsmouth Memorial Bridge’s micro-piles. The bridge was undergoing a complete rehabilitation, including new concrete caps on the 100 year old mass concrete piers. VCS was asked to develop a CP system to protect micro-piles being installed into the original concrete piers.
As part of the Portsmouth Memorial Bridge renovation, steel threadbar micro-piles were used to pin the existing, approximately 100 year old, concrete piers to bedrock below the river channel. During the micro-pile installation, a concern arose that cracks, voids, or damage to the existing piers may have exposed the micro-pile steel casings directly to seawater. This exposure would lead to corrosion activity and a reduction in the micro-pile service life.
VCS performed corrosion testing on the micro-piles to determine the suitability of CP and to develop a replaceable system that will provide sufficient corrosion protection for 25 years. Onsite testing was conducted and confirmed that corrosion of the micro-piles was a concern. Polarization testing of the micropiles was conducted and the information was used to custom design the galvanic protection system utilizing bulk aluminum anodes placed around the piers. VCS evaluated the CP installation and verified proper operation after installation. VCS installed a monitoring station on each pier so that performance data from the CP system could be collected and analyzed. These monitoring stations allow the New Hampshire Department of Transportation to collect information on the remaining life of the anodes and verify operation of the CP system.