The resistivity (or its inverse conductivity) of a saturated concrete specimen provides rapid information on the resistance of the concrete to penetration of chloride ions by diffusion. The term bulk is used to indicate that the measurement is made through the specimen as opposed to a surface-based measurement.  

Merlin uses the four-point measurement method for accurately measuring the specimen resistance to an electrical alternating current (325 Hz) current, minimizing the effects of the conductive sponges and the pressure applied to the electrodes. A voltmeter measures the voltage drop across the specimen, and an ammeter measures the current through the specimen. From the measured current I and voltage V, the bulk resistivity or its inverse conductivity, are calculated and displayed.

Two versions are available depending on the size of specimens that want to be tested. The operation is very simple and a measurement is obtained within two seconds.

Concrete resistivity meter

• Research and development to characterize the influence of new materials on the electrical resistivity of concrete.
• Optimizing mixture proportions and blends of supplementary cementitious materials to increase concrete service life.
• On-site durability quality control and quality assurance.
• Evaluation of in-place concrete (using cores).

Concrete resistivity meter.

• 220 VAC / 60 Hz or 110 VAC / 50 Hz power supply
• Measurement time: ≈ 2 seconds
• Frequency: 325 Hz AC
• Sampling rate: 5 Hz
• Precision: ± 0.1 % for 20 to 4,000 Wm at 23^oC
• Test results displayed in terms of bulk resistivity or conductivity
• Test results can be stored for preparing test reports
• USB connection
• Compatible with Windows 7 / 8 / 10 operating systems.
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Two versions of the Merlin system are available:

To be ordered separately

• Technical data-sheet 

More documentation is available upon request.

ASTM C1876 “Standard Test Method for Bulk Electrical Resistivity or Bulk Conductivity of Concrete”