Two-component composition for forming an injectable or pumpable organo-mineral material, and associated sealing methods and uses

A two-component composition comprising:

• a component A mixed, in situ, with a component B in order to form an injectable or pumpable organo-mineral material or compound,
• the component A comprising at least one alkali metal silicate and
• the component B comprising at least one polyisocyanate prepolymer and
• at least one cement,
• wherein component A moreover contains at least one polyol with a molecular mass of between 50 and 200 g/mol, a polymerization catalyst comprising at least one primary amine or alcohol function and at least one gelling agent wherein the final mixture of the two components A and B immediately forms a gel, that is not completely set, and in that the component B moreover comprises at least one compatible plasticizer, the final mixture of said components A and B leading to the formation of an organo-mineral material exhibiting compressive strength at 10% strain of at least 17 MPa, in accordance with the standard ISO 604, and shear strength of at least 7 MPa, in accordance with the standard ASTM D732, and setting times of between 20 seconds and 15 minutes at 20° C.