Corrosion
Assessment
Half-cell potential, electrical resistivity and moisture assessment — mapping corrosion probability across reinforced concrete structures.
Electrochemical
Corrosion Mapping
Corrosion testing evaluates the condition of reinforced concrete structures for quality control, integrity verification, and assessment of corrosion risk in aging assets. Our programs are tailored to project objectives and focus on key electrochemical and physical indicators of reinforcement corrosion.
The three complementary methods — half-cell potential, electrical resistivity and moisture assessment — are combined to build a spatially resolved corrosion probability map, enabling targeted investigation and prioritised remediation.
Three Methods,
One Complete Picture
Each method contributes a distinct dataset. Combined, they eliminate ambiguity in corrosion probability assessments and enable confident, defensible risk classification.
Half-Cell Potential Testing
Measures the electrical potential between reinforcing steel and a surface reference electrode. More negative readings indicate a higher probability of active corrosion, enabling efficient spatial mapping of corrosion-prone areas within a structure.
| Half-Cell Potential (mV vs CSE) | Corrosion Probability |
|---|---|
| More positive than −200 mV | Low — <10% chance of active corrosion |
| −200 mV to −350 mV | Uncertain — corrosion activity uncertain |
| More negative than −350 mV | High — >90% chance of active corrosion |
Electrical Resistivity Testing
Evaluates the concrete's resistance to ionic flow — strongly influenced by moisture content and pore-network permeability. Lower resistivity values are associated with increased corrosion risk and identify zones where environmental conditions favour reinforcement deterioration.
| Resistivity (kΩ·cm) | Corrosion Risk |
|---|---|
| > 950 kΩ·cm | Low |
| 400–950 kΩ·cm | Moderate |
| 220–400 kΩ·cm | High |
| < 220 kΩ·cm | Very High |
Moisture Assessment
Quantifies the presence of water within the concrete matrix, providing critical context for interpreting electrochemical test results. When combined with half-cell and resistivity data, moisture measurements improve confidence in corrosion risk evaluations and help explain spatial patterns in the mapped results.