A shotcrete nozzle assembly comprising: a tubular body including a body sidewall defining a central passageway extending along a central longitudinal passageway axis, and water dispensing bores extending through the body sidewall and including: first and second sets of water dispensing bores positioned such that outlet openings thereof defined in an inner face of the body sidewall are disposed in a respective one of longitudinally spaced-apart first and second transversal planes extending perpendicularly to the passageway axis, at least some of the water dispensing bores being oriented such that the central bore axes thereof extend in a non-radial direction relative to the passageway axis, and such that an orthogonal projection of the central bore axes of the first and second sets of water dispensing bores onto one of the transversal planes forms first and second projected central bore axes which intersect each other at a first non-zero angle.

A system for spraying granular pasty matrices onto buildings, the system including a spray gun for wet mortar which makes possible the easy, safe, and efficient spraying of wet mortar including aggregates with a particle size D50 of between 1 and 15 millimeters. The spray gun is provided with a gun body with at least one injector emerging in a contacting chamber, at least one spray nozzle for mortar, and at least one connection end piece mounted on an inlet of a body for flow of mortar. Flow of mortar within a guiding duct of the body is monodirectional or multidirectional having angular deviation <30. The position of an injection head of the injector in the chamber is adjustable. The mortar is constituted by a pasty matrix including aggregates, fillers and additives. The aggregates have a D50=1-15 mm and a form factor F1.

A system and method for applying a construction material is provided. The method may include mixing blast furnace slag material, geopolymer material, alkali-based powder, and sand at a batching and mixing device to generate a non-Portland cement-based material. The method may also include transporting the non-Portland cement-based material from the mixing device, through a conduit to a nozzle and combining the transported non-Portland cement-based material with liquid at the nozzle to generate a partially liquefied non-Portland cement-based material. The method may further include pneumatically applying the partially liquefied non-Portland cement-based material to a surface.

A process for producing insulating foam, wherein certain especially small inorganic minerals such as silica fume are directly integrated into bubble fluid to better mechanically strengthen bubbles formed and thus allow the formation of smaller bubbles to be reformed. The manner of reforming the bubbles is progressive and actualized by a glass bead chamber, a second stage consisting of two screened discs, separated from each other and located at the end of the glass bead chamber, and a third stage chamber presenting itself with a considerably enlarged screen area and having considerably finer meshes than the second stage.

An apparatus for cooling a concrete mixture, including a mobile base, and an arm support assembly. The arm support assembly is pivotally attached to the mobile base, and wherein the arm support assembly is configured to fold against the mobile base for transport. An arm assembly, wherein the arm assembly is configured to move along the arm support assembly, and wherein the arm assembly is configured to fold against the arm support assembly for transport. A lance assembly, wherein the lance assembly is configured to be inserted into a cement mixer, wherein the lance assembly is configured to fold against the arm assembly for transport. A method for cooling a concrete mixture, including positioning the lance and cement truck to enter the opening of a cement truck. Inserting the lance into the cement truck and introducing liquid nitrogen into the concrete mixer and thereby mixing with the cement mixture.

Disclosed is a composite gypsum board comprising a set gypsum core disposed between face (e.g., Manila) and back (e.g., Newsline) cover sheets. The set gypsum core is formed from a core slurry comprising stucco, water, and optional additives, such as foaming agent, migrating starch, accelerator, retarder, dispersant, etc. A dense layer formed from a dense layer slurry comprising stucco, water, fiber (e.g., paper fiber), and optionally, strength-enhancing starch, is disposed between the core and the face paper. The dense layer slurry contains a greater concentration of fiber, and optionally, strength-enhancing starch, than the core slurry, but the concentration of one or more other additives (e.g., accelerator, retarder, dispersant, or combinations thereof) is lower or the same in the dense slurry as compared with the core slurry. Also disclosed is a method of making board using one board mixer. In embodiments, paper fiber is added to water to form a suspension. The suspension is introduced, while in a non-laminar state, into the dense slurry. Further disclosed is apparatus, such as an extractor and an additive injection system, which can be a part of a cementitious slurry mixing and dispensing assembly.

A feed wheel is provided that includes a body, a plurality of material ports formed in the body, and a plurality of outer pressure ports formed in the body. The body is operable to rotate about a central axis. The material ports are operable to receive material. The outer pressure ports are positioned radially outward in relation to the material ports. Each of the outer pressure ports is operable to receive pressurized gas when in registration with a pneumatic supply as the body rotates about the central axis. Each of the outer pressure ports are in fluid communication with a corresponding material port such that when an outer pressure port receives the pressurized gas, the pressurized gas discharges the material from the corresponding material port s out of the top surface of the body.

A heatable storage tank includes a storage chamber arranged to hold a material. The storage tank may include a heating element disposed in the storage chamber to heat the material. The storage tank may also include a jet mixing device to mix the material in the storage chamber. The jet mixing device may include an array of nozzles configured to eject the material from the nozzles and into the storage chamber to agitate and mix the material in the storage chamber. The nozzles may be positioned in a lower half of the storage chamber and oriented to eject the material downwardly toward the bottom wall.