Chloride Profiling & Durability Modelling
Quantifying Corrosion Risk and Remaining Service Life
Overview
Chloride profiling measures chloride concentration at incremental depths within concrete to determine how far chloride ions have penetrated and at what rate. This data is the primary input for durability modelling — predicting when corrosion will initiate.
SiteOps obtains profiles by drilling powder samples at 10mm increments from the exposure surface. Samples are submitted to NATA-certified laboratories for acid-soluble chloride determination to AS 1012.20.
The resulting concentration-versus-depth profile is fitted to Fick's second law of diffusion to determine the apparent diffusion coefficient and surface chloride concentration — enabling residual service life prediction.
Applications
Corrosion Risk Quantification
Determining chloride concentration at reinforcement depth relative to the corrosion threshold.
Service Life Prediction
Mathematical modelling to predict when corrosion initiation will occur.
Maintenance Optimisation
Determining optimal timing for protective treatments or cathodic protection.
Design Life Extension
Providing evidence for continued service beyond original design life.
Technical specifications
| Sampling Interval | 10mm increments |
|---|---|
| Sampling Depth | 50–80mm or to reinforcement depth |
| Analysis | AS 1012.20 / ASTM C1152 |
| Threshold | 0.4–0.6% by weight of cement |
| Modelling | Fick's second law diffusion analysis |
| Laboratory | NATA-accredited (ISO/IEC 17025) |
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FAQ
Common questions
What is the corrosion threshold?+
Commonly cited as 0.4% chloride by weight of cement, though it varies with concrete quality and conditions.
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