Abstract A unique chemical grouting composition is provided for injection stabilization of earth, sand and other porous, particulate formations or agglomerates or solids. The composition produces grouted structures of excellent strength and durability and has a wide range of uses in a system comprising sequential formulation and subsequent injection of on-site-formed aqueous solutions of (a) base materials comprising vegetative polyphenolic material derived from coniferous bark or a tannin of the catechin or condensed type and of (b) catalyst mixtures comprising a water soluble alkali metal silicate, formaldehyde or paraformaldehyde, and sufficient acid to establish the catalyst solution pH at 0.5 to 6.0 and preferably 3-5. Optional modification materials such as asphalt, clay, or a hydraulic cement, or fibrous material such as asbestos, may be included.
A composition according to claim 1 wherein said alkali metal silicate has a weight ratio of SiO2 to alkali metal oxide of from about 1.0 to about 3.8.
Claim 2
Dependent Claim
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A composition according to claim 1 which further contains from about 0.5 percent to about 5.0 percent of formaldehyde based on the weight of said polyphenolic material.
Claim 3
Dependent Claim
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A composition according to claim 3 in which said alkali metal silicate is sodium or potassium silicate.
Claim 4
Dependent Claim
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A composition according to claim 4 which contains sulfamic acid in an amount sufficient to adjust the pH in the catalyst solution to from about 0.5 to 6.0.
Claim 5
Dependent Claim
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A composition according to claim 4 in which said pH is adjusted from about 3.0 to about 5.0.
Claim 6
Dependent Claim
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A composition according to claim 4 which further contains an auxiliary material dispersed therein, said material being selected from the group consisting of aqueous asphalt emulsion, clay, hydraulic cement, asbestos and mixtures thereof.
Claim 7
Dependent Claim
127 words
A composition for producing a grouted structure which consists essentially of an aqueous solution of (a) vegetative polyphenolic material selected from the group consisting of catechin and condensed-type tannins and alkaline extracts of a coniferous tree bark, in an amount from about 5 percent to about 40 percent based on the weight of the solution, (b) sodium metasilicate in an amount sufficient to provide from about 1 percent to about 15 percent of SiO2 based on the weight of said polyphenolic material, (c) formaldehyde in an amount from about 0.5 percent to about 5.0 percent based on the weight of said polyphenolic material, and (d) a strong acid in an amount sufficient to establish to pH of the solution within the range from about 0.5 to 6.0.