A cementitious composite includes a cementitious mixture of cementitious materials and non-cementitious materials. Prior to the in-situ hydration, V.sub.b=M.sub.c/.sub.c.Math.(1+F.sub.v)+.sub.i.sup.n(M.sub.nc.sub.i/.sub.nc.sub.i) where V.sub.b is the bulk volume of the cementitious mixture per unit area of the cementitious composite, M.sub.c is a mass of the cementitious materials of the cementitious mixture per unit area of the cementitious composite, .sub.c is a density of the cementitious materials of the cementitious mixture, M.sub.nc.sub.i is a mass of each constituent type of the non-cementitious materials of the cementitious mixture per unit area of the cementitious composite, .sub.nc.sub.i is a density of each constituent type of the non-cementitious materials of the cementitious mixture, and F.sub.v is a ratio of the volume of the voids within the cementitious mixture relative to the volume of the cementitious materials of the cementitious mixture per unit area of the cementitious composite. F.sub.v is between 0.64 and 1.35.

A brick includes a thermoplastic material, such as high density polyethylene (HDPE), and a cement-containing material. The brick may be made by mixing thermoplastic material and dry, uncured cement-containing material. This mixture is placed in a mold. The mold is heated while the mixture is compressed to melt or soften the thermoplastic material and to bind the particulate material in the mold into the shape of a brick. After the hardened brick is removed from the mold, the surface of the brick may be sprayed with water to cure cement-containing material on the surface of the brick.

A brick includes a thermoplastic material, such as high density polyethylene (HDPE), and a cement-containing material. The brick may be made by mixing thermoplastic material and dry, uncured cement-containing material. This mixture is placed in a mold. The mold is heated while the mixture is compressed to melt or soften the thermoplastic material and to bind the particulate material in the mold into the shape of a brick. After the hardened brick is removed from the mold, the surface of the brick may be sprayed with water to cure cement-containing material on the surface of the brick.

The invention refers to the gypsum industry and the construction industry, in particular to a method for obtaining a water/gypsum mixture used to manufacture gypsum products. The technical result of the invention is continuous industrial manufacturing of water/gypsum mixture at critically low water/gypsum ratio while maintaining high fluidity of the mixture. The said technical result is achieved because a method for continuous manufacturing water/gypsum mixture at a water/gypsum ratio of less than 0.25:1 is implemented by using a portion of the mixture as a transport medium for introducing new batches of liquid and dry components and includes the following stages: pre-mixing a flow of fluid water/gypsum mixture and dry components; obtaining, in the mixer, a finished water/gypsum mixture with the specified water/gypsum ratio by intensively mixing the pre-mixed dry components and fluid water/gypsum mixture flow; releasing a portion of the finished water/gypsum mixture flow from the process cycle and returning the remaining portion of the finished water/gypsum mixture to the mixing process as a transport medium for introducing new components; obtaining a fluid water/gypsum mixture flow after adding liquid components to the remaining portion of the water/gypsum mixture flow with subsequent mixing.

Disclosed are cementitious materials as well as methods of forming cured cementitious materials.

Disclosed are cementitious materials as well as methods of forming cured cementitious materials.

Disclosed are fibers which include silver particles as incorporated into textile at low concentrations to render the textiles as bactericidal in accordance with various standards including government standards.

A lightweight aggregate-based non-steam-cured high-performance pipe culvert and a preparation method thereof. The lightweight aggregate-based non-steam-cured high-performance pipe culvert is prepared from a raw material including the following components by mass per unit volume: 300-450 kg/m.sup.3 of a low-carbon sulfur-aluminum-ferric cementitious material; 800-920 kg/m.sup.3 of a solid waste-based lightweight aggregate; 300-550 kg/m.sup.3 of a solid waste-based artificial sand; 0-100 kg/m.sup.3 of a mineral admixture; 0-50 kg/m.sup.3 of an auxiliary material; and 110-160 kg/m.sup.3 of water; and the lightweight aggregate-based non-steam-cured high-performance pipe culvert further includes a water reducer and a retarder. The lightweight aggregate-based non-steam-cured high-performance pipe culvert of the present invention can be demolded within 4 hours during forming, with short demolding time and no need for steam curing, resulting in a low production cost and high production efficiency. The obtained product has high strength, good impermeability and durability, and can utilize solid waste in a high proportion.

Set forth herein are processes and reagents for using concrete mixtures to make concrete in which the concrete mixture includes reactive CaO or reactive MgO and hardens via hydrothermal densification process comprising hydration and carbonation reactions. In hydrothermal densification process water in the form of vapor, liquid, or steam and CO.sub.2 in the form of gaseous or liquid or a combination thereof are enforced in concrete pore space to form hydrated calcium carbonates (HCC) and/or hydrated magnesium carbonates and other hydration products to densify concrete microstructure. Certain processes and reagents are useful for adjusting the initial porosity of a concrete mixture. Certain processes and reagents are useful for regulating the rate of microstructure development of concrete during curing. Certain processes and reagents are useful for adjusting the initial porosity of a concrete mixture and also useful for regulating the rate of microstructure development of concrete during curing. The instant disclosure provides pathways for the utilization of lime/magnesia-containing industrial solid waste that otherwise cannot be generally used for concrete applications.

An injection well bored in a mafic and/or ultramafic rock used for carbon dioxide sequestration and a method of cementing a CO.sub.2 injection well with a formulated cured. The injection well may include a surface casing and an injection casing placed in a drilled borehole. The injection well may have an open interval permitting fluid communication f into the mafic and/or ultramafic rock. A cured cement may be present between the mafic and/or ultramafic rock and the injection casing and may be formed from a cementitious slurry mixture containing a class G cement, fly ash, microsilica, additives, and an epoxy resin blend. An injection tubing is disposed in the interior of the injection casing, having fluid communication with the interior of the injection casing. A packer connected to the injection tubing may be present as a fluid seal within the injection casing.