Concrete Resistivity Survey

Birmingham City Laboratories


Concrete surface resistivity measurement provides extremely useful information about the state of a concrete structure. Not only has it been proven to be directly linked to the likelihood of corrosion and the corrosion rate, recent studies have shown that there is a direct correlation between resistivity and chloride diffusion rate and even to determination of early compressive strength. This makes it one of the most versatile NDT methods for concrete.

Birmingham City Laboratories are now using Proceq's Resipod device which is a fully integrated 4-point Wenner probe, designed to measure the electrical resistivity of concrete in a completely non-destructive test. It is the most accurate instrument available, extremely fast and stable and packaged in a robust, waterproof housing designed to operate in a demanding site environment. The Resipod is the successor of the classic CNS Farnell Resistivity Meter.




Proceq's Resipod









Concrete Resistivity
  • Fully integrated surface resistivity instrument
  • Highest resolution available for a surface resistivity instrument
  • Available with 1.5" (compliant with the AASHTO standard) or 50 mm probe spacing
  • Estimation of the likelihood of corrosion
  • Indication of corrosion rate
  • Correlation to chloride permeability
  • On site assessment of curing efficiency
  • Determination of zonal requirements for cathodic protection systems
  • Identification of wet and dry areas in a concrete structure
  • Indication of variations in the water/ cement ratios within a concrete structure
  • Identification of areas within a structure most susceptible to chloride penetration
  • Correlation to early compressive strength
  • Correlation to water permeability of rock