dielectric constant

The paper analyzes the method of identifying the maturity of concrete based on the results of measuring the temperature of concrete during its maturation using a temperature sensor built into the concrete. This method controls the maturity of concrete indirectly. The authors propose a method of controlling the maturity of concrete based on the results of direct measurement of its electrical parameters using a three-electrode capacitive sensor built into the concrete.

At the frequency range up to 100 MHz the real dielectric with permittivity e and conductivity λ simulated by twoterminal element of the electric circuit with complex impedance Z~ or complex conductivity L ~ , in which interaction of electromagnetic fields with the investigated substance is provided. The values of real e ¢ and imaginary e¢ parts of the complex dielectric constant e e e ¢ + ¢ = * is calculated based on the geometric factors and measured values of Z~ and L). In a simplest case two-terminal element represents as a parallel or series connected capacitor Cx and resistor Rx.