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Fritted Glass Bead Materials as Tensiometers and Tension Plates¹

ABSTRACT

A maximum temperature of 655°C which was reached in six steps with approximately 100°C/step/hour for 90 min was used to frit glass beads. Tensiometer or tension plate with desired dimension and operational characteristics can be constructed from the product. Uniformity tests on the product indicate negligible horizontal temperature variations during the fritting process and slow heat dissipation during the cooling phase tends to limit its thickness. Tests on the particle size distributions suggest that glass beads graded to very narrow distribution are required to produce fritted material with both the maximum saturated hydraulic conductivity and maximum air-entry value.

¹ Contribution from the Newfoundland Forest Research Centre, Canadian Forestry Service, St. John's, Newfoundland, Canada.

² Research Scientist, Newfoundland Forest Research Centre, Canadian Forestry Service, St. John's, Newfoundland.

Received for publication June 28, 1976. Accepted for publication September 7, 1976.