Pumpable backfill grout
AssigneeSpecrete-IP Incorporated
InventorsDavid A. Smetana, Richard J. Lenczewski, Alfonzo L. Wilson
Life of this patent
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Abstract
A pumpable backfill grout which hardens into a controlled low strength material and an additive for making up such a backfill grout. The grout consists essentially of portland cement, a smooth surfaced vesicular expanded perlite, fly ash, fine aggregate, water, an air entraining agent, a quick dispersing thixiotropic suspending agent and a bentonite thickening agent.
Claims8
An additive for a pumpable backfill grout consisting essentially of
- ______________________________________ Material Parts by Weight ______________________________________ vesicular 500-1200 expanded perlite air entraining agent 100-200 diatomaceous earth 25-75 quick dispersing thixiotropic 25-75 suspending agent bentonite thickening 10-35 agent dispersant 10-35. ______________________________________
An additive for a pumpable backfill grout consisting essentially of
- ______________________________________ Material Parts by Weight ______________________________________ vesicular 500-1200 expanded perlite air entraining agent 100-200 diatomaceous earth 25-75 quick dispersing hydroxy ethyl 25-75 cellulose thixiotropic suspending agent bentonite thickening 10-35 agent calcium lignosulfonate 10-35. ______________________________________
A pumpable backfill grout consisting essentially of, parts by weight,
- ______________________________________ portland cement 60-300 fly ash 250-350 fine aggregate 2500-3000 water 400-700 vesicular 3-15 expanded perlite air entraining agent .6-1.2 diatomaceous earth .15-.45 quick dispensing thixiotropic .15-.45 suspending agent bentonite thickening agent .06-.2 dispersant .06-.2. ______________________________________
A pumpable backfill grout consisting essentially of, parts by weight,
- ______________________________________ portland cement 60-300 fly ash 250-350 fine aggregate 2500-3000 water 400-700 vesicular 3-15 expanded perlite air entraining agent .6-1.2 diatomaceous earth .15-.45 quick dispensing hydroxyethyl .15-.45 cellulose thixiotropic suspending agent bentonite thickening .06-.2 agent caclium lignosulfonate dispersant .06-.2. ______________________________________
An additive for a pumpable backfill grout consisting essentially of
- ______________________________________ Material Parts by Weight ______________________________________ smooth surfaced vesicular 500-1200 expanded perlite air entraining agent 100-200 diatomaceous earth 25-75 quick dispersing thixiotropic 25-75 suspending agent bentonite thickening 10-35 agent dispersant 10-35. ______________________________________
An additive for a pumpable backfill grout consisting essentially of
- ______________________________________ Material Parts by Weight ______________________________________ smooth surfaced vesicular 500-1200 expanded perlite air entraining agent 100-200 diatomaceous earth 25-75 quick dispersing hydroxy ethyl 25-75 cellulose thixiotropic suspending agent bentonite thickening 10-35 agent calcium lignosulfonate 10-35. ______________________________________
A pumpable backfill grout comprising, parts by weight,
- ______________________________________ portland cement 60-300 fly ash 250-350 fine aggregate 2500-3000 water 400-700 smooth surfaced vesicular 3-15 expanded perlite air entraining agent .6-1.2 diatomaceous earth .15-.45 quick dispensing thixiotropic .15-.45 suspending agent bentonite thickening .06-.2 agent dispersant .06-.2. ______________________________________
A pumpable backfill grout consisting essentially of, parts by weight,
- ______________________________________ portland cement 60-300 fly ash 250-350 fine aggregate 2500-3000 water 400-700 smooth surfaced vesicular 3-15 expanded perlite air entraining agent .6-1.2 diatomaceous earth .15-.45 quick dispensing hydroxyethyl .15-.45 cellulose thixiotropic suspending agent bentonite thickening .06-.2 agent caclium lignosulfonate dispersant .06-.2. ______________________________________
Dependencies are inferred from the claim text.