Weighted Maturity is a Dutch standard for measuring the curing of concrete. It is similar to other systems based on the development of the temperature. The bottom graph shows the temperature (in time), the blue surface under this curve is time x temperature = maturity. By multiplying this with a ‘C-factor’, related to the heat sensitivity of the used cement, Weighted Maturity is obtained. (middle graph). By plotting the compressive strength of pressed cubes or cylinders and the weighted maturity against each other, the calibration line is obtained (top graph).
The bottom graph shows the conductivity in time. By plotting the compressive strength of the cubes / cylinders against the relative conductivity (Gmax/G, multiplied with a temperature correction factor, the calibration line is obtained.