Nev. Admin. Code § 534.065 - "Cement-bentonite grout" defined
"Cement-bentonite grout" means a mixture of sodium bentonite and portland cement that, when mixed with water, is specifically designed to seal and plug instrumentation boreholes and:
1. Consists of a range of water to cement to
bentonite ratios by weight of between 2.5 to 1 to 0.3 and 4 to 1 to 1. For
example, the ratio by weight of 2.5 to 1 to 0.3 is obtained by mixing 30
gallons of water per 94-pound bag of portland cement with 25 pounds of
bentonite and the ratio by weight of 4 to 1 to 1 is obtained by mixing 45
gallons of water per 94-pound bag of portland cement with 94 pounds of
bentonite;
2. Has hydraulic
conductivity or permeability values of 10-7
centimeters per second or less;
3.
Has a fluid weight of not less than 10 pounds per gallon; and
4. Has a 28-day compressive strength of at
least 100 pounds per square inch.
Notes
NRS 534.020, 534.110
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