Grouting composition
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United States of America Patent
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Jun 4, 1991
Issued Date -
N/A
app pub date -
Oct 23, 1990
filing date -
Aug 12, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A grouting composition for sealing a borehole or other cavity contains 90-99.9% finely divided water swellable clay and 0.1-10% polyacrylate thinner having a molecular weight of about 5,000 to 95,000. The grouting composition is mixed with fresh water to provide a completely reswellable, unflocculated, easily placed, low permeability sealing composition. The thinner allows a very high concentration of water-swellable clay in the composition. A preferred grouting composition contains 98-99.9% sodium bentonite and 0.1-2% polyacrylate thinner of molecular weight of about 2,000 to 50,000. In use, 50lb. of the preferred grouting composition is mixed with 11-14 gallons of fresh water, to provide a grouting mixture which includes about 25-40% reswellable solids.
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