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Concrete Reinforcement Corrosion Analysis

Corrosion of steel in reinforced concrete poses the biggest durability issue for concrete structures.  By the time corrosion is evident at the surface through spalling or cracking, damage is typically widespread and may require costly repairs.  Conducting a corrosion analysis of steel embedded in concrete utilizing half-cell electrical measurement technology can efficiently identify areas where corrosion is occurring.  Half-cell electrical measurement technology is used for the detection and mapping of steel reinforcing corrosion in reinforced concrete in accordance with ASTM C876-15, “Standard Test Method for Corrosion Potentials of Uncoated Reinforcing Steel in Concrete.”

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OHMSETT Facility Wave Test Tank Corrosion Analysis

ACER combined half-cell potential testing with chemical analysis of concrete to assess the state of the reinforcement within the concrete wave tank and to determine the extent of chloride intrusion into the concrete due to the salinity of the water...

 

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The goal of the half-cell potential field measurement is to measure the potentials at the concrete surfaces, in order to get a characteristic picture of the state of corrosion of the steel surface within the concrete.  These investigations can locate areas where corrosion is actively occurring but is not evident at the surface in order to identify problem areas and mitigate the issue before it is too late.  ACER’s full suite of half-cell potential measurement electrodes can be applied to very small areas such as columns and beams all the way up to entire bridge decks with a 4-wheeled survey cart.  Upon completion of the survey, the results are plotted on a Chipping Graph in accordance with ASTM C 876-09 which assigns a 90% probability of corrosion ongoing to the areas more negative than -350 mV, and a 90% probability of no corrosion to the areas more positive than -200 mV.  Further refining and calibration of these thresholds can be achieved through an intrusive investigation to correlate the measured potentials to the physical state of the reinforcing steel.

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Additional Geophysics & Non-Destructive Testing Services Provided by ACER:
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