Measuring and testing – With fluid pressure – Porosity or permeability
Patent
1982-12-15
1984-06-12
Goldberg, Gerald
Measuring and testing
With fluid pressure
Porosity or permeability
374 45, G01N 1508
Patent
active
044533985
ABSTRACT:
An ice porosimeter for the accurate and efficient derivation of measurements concerning the porosity of a porous material, which includes a mercury dilatometer having a mercury-filled reservoir with a capillary stem extending upwardly therefrom. The porous material to be analyzed is inserted into the reservoir after it is saturated with water. The temperature of the contents of the reservoir is then varied to cause the water in the porous material to change state, either freezing the water or melting the ice. A thermistor measures the temperature in the reservoir and transmits these readings to a means for recording those measurements. Concurrently, a condenser is placed surrounding the capillary stem of the dilatometer and is connected to electrical circuitry which induces a capacitance across the condenser. As the volume of the contents of the dilatometer increases or decreases with change in temperature, mercury from the reservoir moves up or down the capillary stem thereby changing the capacitance of the condenser. The volume of the pores, pore size distribution, total specific pore surface, and size of pore constrictions can then be derived by means which compares electrical capacitance across the condenser as a function of temperature as measured by the thermistor.
REFERENCES:
patent: 3106086 (1963-10-01), Hughel
patent: 3327524 (1967-06-01), Osgood
patent: 4170129 (1979-10-01), Lowell
Demirel Turgut
Enustun Bekir V.
Goldberg Gerald
Iowa State University & Research Foundation, Inc.
Williams Hezron
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