Abstract: Test apparatus for testing porous material such as used in roadway base or building foundations may be deployed in the field at various test sites. The test apparatus includes electrodes that contact the porous material under test and a sensor unit that supplies electromagnetic signals to the porous material. Response signals reveal electrical parameters such as complex impedance which can be equated to material properties such as density and moisture content. Reference may be made to empirical correlations made in laboratory tests using the same test apparatus to enable the effects of the test apparatus on the measurement to be accounted for. The electrodes may include flexible coplanar electrodes that reduce air gaps when in contact with the porous material.
Type:
Grant
Filed:
January 23, 2019
Date of Patent:
June 22, 2021
Assignee:
ELECTRICAL DENSITY GAUGE, LLC
Inventors:
Dennis M. Anderson, Stephan R-K Fuelling, Dave B Straley, Willian Ehni