Method and apparatus for testing relative permeability of materi

Details Method and apparatus for testing relative permeability of materi Method and apparatus for testing relative permeability of materi

1988-12-01

1990-12-25

Williams, Hezron E.

Measuring and testing

With fluid pressure

Porosity or permeability

73 40, G01M 326

Patent

active

049793900

ABSTRACT:
An apparatus for testing the relative permeability of materials, particularly concrete structures, comprises a transparent, optically non-distorting head having a gasket, which together with the head defines a head chamber, and which allows the head to be sealed against the structure when a partial vacuum is induced in the head chamber. The decay of the vacuum may be measured, and the rate of decay provides an index of permeability. A liquid may be applied to the surface being tested and will foan to allow identification of cracks and fissures. In alternative embodiment, a fluid is introduced into a secondary chamber defined by a secondary gasket and the head, and the rate of permeation of the fluid into the structure provides a measure of permeability. The vacuum mounted test apparatus allows in-situ testing without requiring the extraction of sample cores from the structure or making invasive attachments to the structure, thus providing a quality control apparatus and method for rapid testing of construction materials.

REFERENCES:
patent: 2108176 (1938-02-01), Newby
patent: 3184957 (1965-05-01), Ellis
patent: 3524342 (1970-08-01), Hobbs
patent: 3861196 (1975-01-01), Domenighetti
patent: 4002055 (1977-01-01), Kops
patent: 4052885 (1977-10-01), Shuck
patent: 4311037 (1982-01-01), Gotche
patent: 4676091 (1987-06-01), Schuster
"Permeability Testing of Site Concrete--A Review of Method and Experience"--The Concrete Society (Nov. 1985).
"Permeability as a Measure of Potential Durability of Concrete" K. Schonlin, H. K. Hiladorf.

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