US 5,330,785 AGranted

Method for the sealing of unstable rock strata

OwnerAnthony C. Plaisted, Leonard G. Hickaminventors

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Abstract

A method utilizing non-reactive fillers in the sealing of unstable rock strata under wet or humid conditions, the method comprising providing (a) from about 10 to about 85% by weight of a water soluble alkali metal silicate, (b) about 0.7% to about 10.0% by weight of a water soluble or water miscible reactant for said alkali metal silicate and (c) about 2 to about 50% by weight of non-reactive filler, bringing components (a), (b) and (c) together with sufficient mixing to form a sealing composition, applying the composition in a coating to the rock strata and permitting the composition to set while being exposed to wet or humid conditions to form an impervious sealant coating thereby imparting structural strength and reinforcement and preventing penetration of air and dust through the rock strata. Preferably the non-reactive filler comprises a minor proportion, for example from about 0.2% to about 10% by weight based on the weight of the sealant composition of reinforcing fibers.

Claims14

Dependent claims

A method of sealing rock strata utilizing non-reactive fillers, said method comprising:

providing an aqueous curable sealant composition having a stable shelf life, said composition having first and second components,
said first component comprising on a total weight basis:
(a) from about 10 to 85% by weight of alkali metal silicate solution;
and
(b) from about 2 to about 50% by weight of at least one
non-reactive filler,
said second component comprising a solution on a total weight basis of from about 0.7% to about 10.0% of a water soluble for said alkali metal silicate,
said method comprising mixing said first and second components together to form a sealing composition, applying said composition in a surface coating to said rock strata and said composition setting in a chemical reaction to initiate gel formation, said chemical reaction involving said alkali metal silicate and said water soluble reactant, to form an impervious sealant coating imparting structural strength and reinforcement and also preventing penetration of air and dust through said rock strata.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/979,753Filed 23 Nov 1992 · continuation in part
Priority: 12 Oct 1989
Granted: 19 Jul 1994
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

C04B 24/045
Carboxylic acids; Salts, anhydrides or esters thereof: esters, e.g. lactones
C04B 28/26
Containing alkyl, ammonium or metal silicates; containing silica sols: silicates of the alkali metals
C04B 2111/00724
Uses not provided for elsewhere in C04B2111/00: in mining operations, e.g. for backfilling; in making tunnels or galleries
Y02W 30/91
Reuse, recycling or recovery technologies: use of waste materials as fillers for mortars or concrete

Family

Serial420,495Parent of this continuation-in-part · filed 12 Oct 1989
Serial561,761Parent of this continuation-in-part · filed 27 Aug 1990
Serial804,143Parent of this continuation-in-part · filed 6 Dec 1991
US 5,165,958 AParent of this continuation-in-part
US 5,330,785 AThis patent

From the US filing history. Foreign family members aren’t listed.