A building construction product with an electroconductive surface, the building construction product comprising a core with one or more surfaces covered by an electroconductive paper comprising carbon fibers, the electroconductive paper being attached to the one or more surfaces of the core. Methods and materials for producing the building construction products with an electroconductive surface and products and methods for shielding an area from electromagnetic waves.

An apparatus for injecting an accelerating fluid into an oil well includes casing open at the ends into which a cement flows and positioned inside the well forming an annular zone with its walls. The casing includes a hollow cylindrical body with lateral surfaces integral with the casing internal surfaces and a central hole through which a cement flows, with a lower horizontal section than the casing section. The apparatus includes hollow internal chamber with an accelerating fluid; one or more body inlet devices, which put the body and chamber in fluid communication. The inlet devices are positioned on one of the hollow cylindrical body base surfaces. The apparatus includes at least one body outlet devices, which puts the chamber in fluid communication with the conduit through the central hole, positioned radially with respect to the cylindrical body axis and along the central hole internal surface.

A powdered quick-setting agent containing a calcium aluminate and a sodium silicate, preferably further containing at least one selected from the group consisting of an alkali metal sulfate, an alkaline earth metal sulfate, and an aluminum sulfate.

Methods of cementing include providing a geopolymer cement composition that includes a monophase amorphous hydraulic binder material (MAHBM), a metal silicate, an alkaline activator, and a carrier fluid, introducing the geopolymer cement composition into a subterranean formation, and allowing the geopolymer cement composition to set in the subterranean formation. The MAHBM includes silica or alumina core particulates coated with an amorphous calcium silicate hydrate.

Methods of cementing include providing a geopolymer cement composition that includes a monophase amorphous hydraulic binder material (MAHBM), a metal silicate, an alkaline activator, and a carrier fluid, introducing the geopolymer cement composition into a subterranean formation, and allowing the geopolymer cement composition to set in the subterranean formation. The MAHBM includes silica or alumina core particulates coated with an amorphous calcium silicate hydrate.

A packaged additive for preparing a cementitious composition comprises a water-soluble paper container and at least one non-liquid additive packaged within the water-soluble paper container. A kit for preparing a hardenable cementitious composition comprises the packaged additive and a separate packaged base cementitious material. Also disclosed is a method for preparing a hardenable cementitious composition using the packaged additive and separate base cementitious material components of the kit, and a method for repairing a flaw in a cementitious structure using the hardenable cementitious composition prepared with the packaged additive and the separate base cementitious material.

A packaged additive for preparing a cementitious composition comprises a water-soluble paper container and at least one non-liquid additive packaged within the water-soluble paper container. A kit for preparing a hardenable cementitious composition comprises the packaged additive and a separate packaged base cementitious material. Also disclosed is a method for preparing a hardenable cementitious composition using the packaged additive and separate base cementitious material components of the kit, and a method for repairing a flaw in a cementitious structure using the hardenable cementitious composition prepared with the packaged additive and the separate base cementitious material.

Methods of cementing include providing a geopolymer cement composition that includes a monophase amorphous hydraulic binder material (MAHBM), a metal silicate, an alkaline activator, and a carrier fluid, introducing the geopolymer cement composition into a subterranean formation, and allowing the geopolymer cement composition to set in the subterranean formation. The MAHBM includes silica or alumina core particulates coated with an amorphous calcium silicate hydrate.

Methods of cementing include providing a geopolymer cement composition that includes a monophase amorphous hydraulic binder material (MAHBM), a metal silicate, an alkaline activator, and a carrier fluid, introducing the geopolymer cement composition into a subterranean formation, and allowing the geopolymer cement composition to set in the subterranean formation. The MAHBM includes silica or alumina core particulates coated with an amorphous calcium silicate hydrate.

The invention belongs to the field of eliminating pollutant gases. In particular, the invention belongs to the field of pollutant gas-absorbing material such as CO2, SO2, NOx and VOCs.

The present invention relates to a fresh composite or composite paste and a composite material comprising aggregates of recycled concrete, porous carbon, a binder and optionally water, as well as to the method for manufacturing the composite and the use thereof for sanitizing air (indoor or outdoor). The invention also relates to an article (for example, an anti-noise wall, a tunnel lining, an indoor decoration, an item of street furniture, etc.) comprising the composite according to the invention.