A multi-component resin system can be used for producing a mortar composition based on isocyanate amine adducts for the chemical fastening of construction elements. A mortar composition based on isocyanate amine adducts can be produced from the multi-component resin system. A method can be used for the chemical fastening of construction elements in mineral substrates with the mortar composition based on the isocyanate amine adducts.

Various inventive concepts of the present invention are directed to a water-repellent concrete admixture for the production of water-repellent masonry. In some exemplary embodiments, the water-repellent admixture includes water, a hydrolyzable silane, at least one silicone; and an amino-functional silane. The water-repellent concrete admixture is incorporated integrally into a concrete mixture.

Various inventive concepts of the present invention are directed to a water-repellent concrete admixture for the production of water-repellent masonry. In some exemplary embodiments, the water-repellent admixture includes water, a hydrolyzable silane, at least one silicone; and an amino-functional silane. The water-repellent concrete admixture is incorporated integrally into a concrete mixture.

A method of reducing lost circulation includes introducing a lost circulation solution comprising Saudi Arabian volcanic ash, a curing agent, and a resin into a subsurface formation through a wellbore, wherein the Saudi Arabian volcanic ash comprises SO.sub.3, CaO, SiO.sub.2, Al.sub.2O.sub.3, Fe.sub.2O.sub.3, MgO, and K.sub.2O; and allowing the lost circulation solution to thicken within the subsurface formation, thereby forming a barrier between the subsurface formation and the wellbore to reduce lost circulation.

A method of reducing lost circulation includes introducing a lost circulation solution comprising Saudi Arabian volcanic ash, a curing agent, and a resin into a subsurface formation through a wellbore, wherein the Saudi Arabian volcanic ash comprises SO.sub.3, CaO, SiO.sub.2, Al.sub.2O.sub.3, Fe.sub.2O.sub.3, MgO, and K.sub.2O; and allowing the lost circulation solution to thicken within the subsurface formation, thereby forming a barrier between the subsurface formation and the wellbore to reduce lost circulation.

A clinker that has a total content of C.sub.3A and C.sub.4AF of 22 to 40 mass %, calculated according to Bogue's formulas, and an iron modulus of 0.8 to 1.3 is pulverized with gypsum. Alternatively, the clinker after pulverization is mixed with gypsum powder. A pulverization agent comprising N-methyl-di-ethanol-amine and/or di-ethanol-isopropanol-amine is used in the pulverization.

A method includes introducing an epoxy resin system to a wellbore defect in a wellbore. The epoxy resin system comprises a polyhedral oligomeric silsesquioxane (POSS) epoxy resin with at least one reactive group and a curing agent. The method includes maintaining the epoxy resin system in the wellbore such that a cured epoxy resin system product forms in the wellbore defect.

A method includes introducing an epoxy resin system to a wellbore defect in a wellbore. The epoxy resin system comprises a polyhedral oligomeric silsesquioxane (POSS) epoxy resin with at least one reactive group and a curing agent. The method includes maintaining the epoxy resin system in the wellbore such that a cured epoxy resin system product forms in the wellbore defect.

A composition including cement, filler, polymer and a compound having epoxide groups and also an amine, wherein the composition contains more than 10% by weight of cement and at room temperature is present as storage-stable free-flowing powder and/or granular material. When mixed with water, the composition makes polymer-modified mortars having good processability, excellent adhesion, strength, water impermeability, chemical resistance and quick coatability possible.

A composition including cement, filler, polymer and a compound having epoxide groups and also an amine, wherein the composition contains more than 10% by weight of cement and at room temperature is present as storage-stable free-flowing powder and/or granular material. When mixed with water, the composition makes polymer-modified mortars having good processability, excellent adhesion, strength, water impermeability, chemical resistance and quick coatability possible.