Estimating Concrete Bulk Resistivity via the Maturity Method

A recent research paper published by the University of Toronto studied the relationship between concrete maturity and its electrical resistivity.

This thesis also compared various devices used to measure electrical resistivity, including Giatec's RCON, Germann Instrument's Merlin, and Proceq's Resipod. It was shown that RCON provides relatively accurate results (±5%) on a model electrical circuit having resistance and capacitance properties.

The Role of Concrete Maturity in Resistivity-Based Performance Specification

Author: Gita Charmchi
Supervisor: Dr. Doug Hooton
Download original thesis.


RCON Most Accurate Electrical Resistivity Tool for Concrete

This research aims to develop a standard method for estimating concrete bulk resistivity via the maturity method. Eight different concrete mixtures were cured in different environments and monitored for resistivity development with relation to specimen maturity.

Additionally, various factors and their effects on bulk resistivity readings are discussed, including the degree of sample saturation and the saturating fluid.

Finally, three commercially available resistivity meters are compared:

  1. RCON by Giatec
  2. Merlin by Germann Instruments, and
  3. Resipod by Proceq.

Because bulk resistivity development is sensitive to curing temperature, a log-linear equation relating bulk resistivity and maturity of a particular concrete mixture could not be developed. Calibration between the three commercially available resistivity meters continues to pose a challenge for the standardization of resistivity-based performance specifications due to the difference in results produced by each meter, an average of +/- 9.0%.

Concrete Maturity is a reliable and standardized method for real-time strength estimation of concrete in a job site. Learn more about concrete maturity as well as how it's measured and used. What is Concrete Maturity?