Half Cell Potential Difference Test

Use Cases

• Applicable to: Concrete elements of any size, cover depth, or age.
• Purpose: Identify areas with a high probability of active corrosion in reinforcement.
• Non-destructive: Causes no harm to the structural integrity.
• Expert Interpretation Required: Results must be analyzed by corrosion engineers or specialists in concrete materials.

Key Benefits:

• Detects early signs of corrosion activity in reinforced concrete
• Guides decisions on repair, maintenance, or replacement
• Can be integrated with other tests (chloride ion content, resistivity, GPR) for comprehensive durability assessment
• Ideal for bridges, tunnels, parking decks, marine structures, dams, and exposed concrete

ASTM Standard:

• ASTM C876Standard Test Method for Corrosion Potentials of Uncoated Reinforcing Steel in Concrete Specifies procedures for conducting the test, interpreting results, and assessing corrosion risk thresholds

 ACI References:

• ACI 222R-01–Protection of Metals in Concrete Against Corrosion Discusses half-cell potential testing as a tool to evaluate and mitigate corrosion in concrete structures
• ACI 201.2R-16 – Guide to Durable Concrete
  Highlights corrosion testing methods including ASTM C876, especially for existing concrete structures
• ACI 362.1R-12 – Guide for the Design of Durable Parking Structures Recommends half-cell testing as part of condition assessments

AASHTO Reference:

• AASHTO T 358–Standard Method of Test for Surface Resistivity Indication of Concrete’s Ability to Resist Chloride Ion Penetration
  While not the same test, this is used in with half-cell potential for durability assessments
• AASHTO Maintenance Manual for Roadways and BridgesRecommends ASTM C876 as a corrosion condition assessment method during bridge inspections