Strength-related testing of concrete using microwave signals

Details Strength-related testing of concrete using microwave signals Strength-related testing of concrete using microwave signals

1993-05-07

1999-08-17

Karlsen, Ernest F.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Distributive type parameters

324647, 324632, G01R 2704

Patent

active

059398892

ABSTRACT:
An apparatus is disclosed for testing concrete having an unknown water/cement ratio and an unknown compressive strength. The apparatus includes a transmitter assembly for transmitting microwave signals at one or more predetermined frequencies. A receiver assembly receives each microwave signal reflected from the concrete under test. The reflected microwave signals, together with the transmitted microwave signals, are used to determine a reflection coefficient magnitude for the particular microwave frequency. A processing unit uses the reflection coefficient magnitude to determine a value related to concrete strength. In one embodiment, the processing unit relies on a logarithmic function that correlates the reflection coefficient magnitude and a water/cement ratio. A value related to the compressive strength of the concrete can also be obtained using the value of the water/cement ratio or the value of the reflection coefficient magnitude.

REFERENCES:
patent: 3562642 (1971-02-01), Hochschild
patent: 4155035 (1979-05-01), Fitzky
patent: 5046356 (1991-09-01), Osaki
patent: 5229726 (1993-07-01), Kent
patent: 5256978 (1993-10-01), Rose
Rzepecka, M.A., et al., "Monitoring of Concrete Curing Process by Microwave Terminal Measurements," pp. 120-125, IEEE Transactions on Industrial Electronics and Control Instrumentation, vol. IECI-19, No. 4, Nov. 1974.

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