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Concrete Corrosion Analysis & Testing

 

The characteristics of uncontaminated concrete naturally inhibit the corrosion process from taking place. However, when the concrete becomes contaminated, those characteristics change and corrosion of the steel readily occurs. That change can be caused by de-icing salts, calcium chloride additives, seawater or industrial chemicals. The resultant corrosion product, or rust, occupies a volume 4-5 times that of the original metal and causes internal stresses that crack the concrete. When the concrete is contaminated at the reinforcing steel level, no traditional repair methods, such as patching, sealers or membranes, will stop the corrosion.

Before any concrete structure is rehabilitated, it is important to determine the condition of the concrete. Concrete distress can be caused by many factors. To help the structural engineer or contractor determine the best rehabilitation plan, MATCOR provides such diagnostic services as: 

Potential Profiles 
Using highly accurate equipment and techniques, we conduct electro-potential (half-cell) surveys on all types of structures. Done in accordance with ASTM Standards, a profile drawing is developed that clearly shows the areas of corrosion. 

Chloride Analysis
Utilizing the information developed in the potential profiles, areas are selected for chloride ion analysis. The results can help determine the severity of corrosion and where future problems will occur. 

Core Samples
Data taken from the potential profiles is also used to determine the location for core samples. The samples are then subjected to thorough laboratory analysis. 

Reporting
The MATCOR diagnostic program goes beyond reporting the as-is condition of the structure. By processing the large amount of data through a sophisticated computer program, rehabilitation procedures for various life expectancies can be made.