Pumped Bentonitic Mixture Used to Seal Piezometers

by Claud A. Fetzer, (F.ASCE), Consulting Geotechnical Engr.; 1425 Holman View Dr., Cincinnati, Ohio 45215,

Serial Information: Journal of the Geotechnical Engineering Division, 1982, Vol. 108, Issue 2, Pg. 295-299

Document Type: Journal Paper


Methods used to install the bentonite seal and sand-cement grout seal for multi-level piezometers are described. After problems developed in trying to use bentonite pellets to install a seal, powdered bentonite was mixed with water for form a paste which was pumped to the bottom of the hole. Additives were used in the sand-cement grout above the bentonite seal to prevent shrinkage of the grout away from the wall of the hole and to retard the initial set until the casing could be pulled.

Subject Headings: Bentonite | Grouting | Pumps | Mixtures | Measuring instruments | Soil cement | Water management | Chemical additives

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