Pumpable backfill grout

• US 5,294,255 A
• Filed: 09/23/1992
• Issued: 03/15/1994
• Est. Priority Date: 09/23/1992
• Status: Expired due to Fees

• Current Assignee: Advanced Cell Technology Incorporated (Astellas Pharma Incorporated), Donald S. Daczko, Henry R. Hatch III, Intrusion-Prepakt Incorporated, Jeffrey D. Chokel, Leslie A. Hynes, Nelson S. Talbott, Quebec Avenue Properties, Inc., Richard E. Garman, Specrete-Ip Incorporated, William C. Mccoy Jr
• Original Assignee: Specrete-Ip Incorporated
• Inventors: Smetana, David A., Lenczewski, Richard J., Wilson, Alfonzo L.
• Primary Examiner(s): Bell, Mark L.
• Assistant Examiner(s): MARCHESCHI, MICHAEL A
• Application Number:
  US07/949,435
• Time in Patent Office: 538 Days
• Field of Search: 106/675, 106/677, 106/698, 106/705, 106/706, 106/708, 106/709, 106/718, 106/719, 106/724, 106/738, 106/820, 106/823, 106/DIG. 1, 106/DIG. 2, 252/378 P, 405/266, 405/267
• US Class Current: 106/698
• CPC Class Codes: C04B 14/08 Diatomaceous earth
• CPC Class Codes: C04B 14/104 Bentonite, e.g. montmorillonite
• CPC Class Codes: C04B 14/185 expanded
• CPC Class Codes: C04B 18/08 Flue dust , i.e. fly ash
• CPC Class Codes: C04B 2103/304 Air-entrainers
• CPC Class Codes: C04B 2103/465 Water-sorbing agents, hygroscopic or hydrophilic agents
• CPC Class Codes: C04B 2111/00146 Sprayable or pumpable mixtures
• CPC Class Codes: C04B 2111/00663 as filling material for cavities or the like
• CPC Class Codes: C04B 2111/00706 around pipelines or the like
• CPC Class Codes: C04B 28/04 Portland cements
• CPC Class Codes: Y02W 30/91 Use of waste materials as fillers for mortars or concrete
• CPC Class Codes: Y10S 106/02 Perlite

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.

Claims

1. An additive for a pumpable backfill grout consisting essentially of

2. An additive for a pumpable backfill grout consisting essentially of

3. A pumpable backfill grout consisting essentially of, parts by weight,

4. A pumpable backfill grout consisting essentially of, parts by weight,

5. An additive for a pumpable backfill grout consisting essentially of

6. An additive for a pumpable backfill grout consisting essentially of

7. A pumpable backfill grout comprising, parts by weight,

8. A pumpable backfill grout consisting essentially of, parts by weight,