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CEMENT-BENTONITE GROUT BACKFILL FOR BOREHOLE INSTRUMENTS (2002)

The backfill for a borehole instrument is often an item that receives a
disproportionate lack of attention. The behavior of the backfill, the
material that is in the most intimate contact with both the formation
and the instrument, is critical for obtaining correct measurements.In
many situations, instrument observations may just reflect unstable
backfill, lack of backfill or backfill that is too stiff or too soft. Sand,
gravel and various bentonite products have proven to be both too
difficult to place and often entirely inappropriate. Experience has
shown the author that cement-bentonite grout is the most universally
applicable material for successfully backfilling a borehole instrument. 
Reference:
GEOTECHNICAL INSTRUMENTATION NEWS, December 2002
Organization:
Consulting Engineer, Geometron
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