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Evaluation and Removal of Surface Contaminants From Steel Prior to Coating

Project Information

Project ID: 
FHWA-PROJ-11-0057
Project Status: 
Terminated
Start Date: 
Monday, August 1, 2011
End Date: 
Sunday, November 18, 2012
FHWA Program: 
Infrastructure
FHWA Subprogram: 
Structures
FHWA Topics: 
Roads and Bridges--Structures; Research/Technologies--Turner-Fairbank Highway Research Center (TFHRC)
TRT Terms: 
Infrastructure; Steel Bridges; Coatings; Research; Corrosion; Abrasives
FHWA Discipline: 
Structures
TRB Subject Area: 
Bridges and other structures, Research

Contact Information

First Name: 
Justin
Last Name: 
Ocel
Telephone: 
(202) 493-3080
Email Address: 
Team: 
Bridge Engineering Team
Office:
Office of Infrastructure Research and Development
Office Code: 
HRDI-40

Project Details

Project Description: 

Well-performing bridge coating systems are founded upon proper preparation prior to coating. Most coating systems require a near white metal blast-cleaned finish prior to the primer coat. However, there is a possibility for surface contamination from either not being removed during the blast cleaning operation or contaminated blast media, causing contamination. This project aims to understand what an acceptable level of contamination is prior to coating, identify what cleaning methods are required to achieve the acceptable level, and identify what means are necessary to measure the surface contaminant concentrations.

Goals

The key project objectives are to:

(1) Identify effective means of measuring chloride, nitrate, and sulfate contamination on the surface of uncoated steel.

(2) Identify proper techniques for cleaning uncoated steel to a target level of contamination.

(3) Determine what levels of contamination are detrimental to bridge coating performance.

Deliverables