ISSN: 1945-7545
CODEN: GTJODJ
Page Count: 3

Effect of Dissolved Oxygen (and Bubbles) on the Measured Permittivity of Geotextiles

Halse, YH
Research associate, professor of physics, and professor of civil engineering, Geosynthetic Research Institute, Drexel University, Philadelphia, PA

Lord, AE
Research associate, professor of physics, and professor of civil engineering, Geosynthetic Research Institute, Drexel University, Philadelphia, PA

Koerner, RM
Research associate, professor of physics, and professor of civil engineering, Geosynthetic Research Institute, Drexel University, Philadelphia, PA

Abstract

Measurements are made of the permittivity in a heat set, nonwoven staple filament polypropylene as a function of the dissolved oxygen content (DOC) of the water. Vacuum deairing of the water to a DOC of 5 ppm or below insures that the measured permittivity will not be lowered by oxygen effects. Careful long-term measurements show that the measured permittivity is reduced very significantly if the DOC rises above 6 ppm. However as long as bubbles are not observed in the water, reasonably good values of the permittivity can usually be achieved, provided the measurements are performed rather quickly.

Keywords:
geosynthetics, geotextiles, permittivity, deairing, flux, dissolved oxygen content (DOC)

Paper ID: GTJ10963J
DOI: 10.1520/GTJ10963J
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