High-early-strength phosphate grouting system for use in anchoring a bolt in a hole

In a grouting system for use in a hole in combination with a reinforcing member wherein a hardened grout is formed around the reinforcing member in the hole by the reaction of the mixed components of a hardenable inorganic grouting product, thereby anchoring the reinforcing member in the hole, the improvement comprising an inorganic grouting product comprising

• (a) an acidic reactive component comprising at least one acidic oxy phosphorus compound selected from the group consisting of phosphoric acids, anhydrides of phosphoric acids, and salts of phosphoric acids with multivalent metal cations;
• (b) a basic reactive component comprising at least one particulate basic metal compound of a Group II or Group III metal capable of reacting with said oxy phosphorus compound(s) in the presence of water to form a monolithic solid;
• and
• (c) an aqueous component;
• said components being present in or outside a hole in a separated condition such that any substantial hardening reaction between the acidic and basic components is prevented, and when present outside the hole being adapted to be delivered into the hole separately or in a freshly combined condition;
• said basic metal compound(s) having a particle surface area of up to about 40 square meters per gram and constituting about from 5 to 35 percent of the total weight of said grouting product, with the proviso that when the particles of said basic metal compound(s) have a surface area of less than 1 square meter per gram, more than about 95 percent of said particles pass through a 200 mesh screen;
• the ratio of the moles of said basic metal compound(s) to the moles of phosphorus pentoxide on which said oxy phosphorus compound(s) are based being in the range of about from 2/1 to 17/1;
• the amount of water present in said product constituting about from 3 to 20 percent of the total weight of said grouting product;
• a particulate aggregate being present in said product in an amount such as to constitute about from 30 to 70 percent of the total weight of said product;
• and the components, when mixed, reacting without the application of heat thereto to form a hardened grout having a pull strength of at least about 175 kilograms per centimeter of anchoring length within an hour.