Calcium oxide
0.6 +- 0.5
Molecular water
6.1 +- 0.6
Minor
2.6 +- 0.6
2.1.3
Bentonite Panels
Provide panels containing bentonite material sealed between two layers of
absorbent material, with a minimum of 4.9 kilograms one pound of evenly
distributed bentonite per square meter foot. The bentonite panels shall be
1200 mm 48 inches square by a minimum of 5 mm 3/16 inch thick, in dry state.
2.1.4
Bentonite Mineral-Base Jelly
Provide material meeting requirements of ASTM D 217 for a worked
penetration range of 215 to 275. Jelly shall contain 45 percent
controlled, partially hydrated, high-swelling sodium bentonite by weight
with minimum pH. of 8.8, no free water, and 25 percent or more residual
swell.
PART 3
EXECUTION
3.1
SURFACE PREPARATION
Examine surfaces prior to treatment, eliminating irregularities and
removing loose and foreign material. [Remove form tie rods.] [Point cracks
and honeycombs in concrete surfaces. Surfaces of finished patches shall be
flush with adjacent concrete surfaces.] [Allow cement mortar to dry for
minimum of 72 hours prior to application of bentonite panels.]
3.2
APPLICATION
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NOTE: Verify that location and extent of bentonite
waterproofing, and location of construction joints
and pipe conduit or similar through-wall openings
are shown on the project drawings regardless of
which option is chosen. Expansion joints will
require additional detailing and their
watertightness is the responsibility of the designer.
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Apply bentonite waterproofing [on exterior surfaces of below grade
[masonry] [and] [concrete] walls [and wall footings]] [and] [under
[concrete slabs,] [pile caps,] [grade beams,] [footings,] [elevator pits]]
[and] [against bulkhead walls] [where indicated], in accordance with
manufacturer's printed instructions. Securely fasten panels over all
construction joints and all expansion joints. Thoroughly pack all
through-wall openings and penetrations with bentonite gel or granular
bentonite, or both, prior to placement of bentonite panels.
3.3
PROTECTION
Provide protection to bentonite panels during backfilling and compaction as
recommended by manufacturer of bentonite materials. If backfill is not
immediately applied, protect panels against precipitation by covering
temporarily with polyethylene. Replace damaged panels with new panels
before and during backfilling and compaction. Compact backfill to at least
85 percent of ASTM D 1557 maximum density.
SECTION 07170
Page 5
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