A method of diffusing CO.sub.2 within a concrete mixture that includes mixing a non-recycled aggregate material with a CO.sub.2 gas in a pretreatment chamber of a concrete preparation system to form a CO.sub.2 adsorbed aggregate material, transferring the CO.sub.2 adsorbed aggregate material from the pretreatment chamber into a cement mixing chamber of the concrete preparation system, and mixing the CO.sub.2 adsorbed aggregate material with cement and water to form the concrete mixture, where mixing the CO.sub.2 adsorbed aggregate material with cement and water releases CO.sub.2 from the CO.sub.2 adsorbed aggregate material and diffuses CO.sub.2 into the concrete mixture to form a carbonated concrete mixture.

A method of diffusing CO.sub.2 within a concrete mixture that includes mixing a non-recycled aggregate material with a CO.sub.2 gas in a pretreatment chamber of a concrete preparation system to form a CO.sub.2 adsorbed aggregate material, transferring the CO.sub.2 adsorbed aggregate material from the pretreatment chamber into a cement mixing chamber of the concrete preparation system, and mixing the CO.sub.2 adsorbed aggregate material with cement and water to form the concrete mixture, where mixing the CO.sub.2 adsorbed aggregate material with cement and water releases CO.sub.2 from the CO.sub.2 adsorbed aggregate material and diffuses CO.sub.2 into the concrete mixture to form a carbonated concrete mixture.

The present application provides for water capsules, preparation methods of water capsules, a preparation method for lightweight concrete and a structure of lightweight concrete. Each of the water capsules comprises an alkali-sensitive shell and water inside; the water capsules are used to mix with a cementitious matrix, the water capsules can survive during concrete mixing and transportation processes but then gradually rupture in hardened concrete; the water released during the hardening of the concrete is beneficial for the hydration of the concrete. The water capsules and their preparation method, the preparation method for and structure of the lightweight concrete of the present application are of unique design and strong practicability.

The present application provides for water capsules, preparation methods of water capsules, a preparation method for lightweight concrete and a structure of lightweight concrete. Each of the water capsules comprises an alkali-sensitive shell and water inside; the water capsules are used to mix with a cementitious matrix, the water capsules can survive during concrete mixing and transportation processes but then gradually rupture in hardened concrete; the water released during the hardening of the concrete is beneficial for the hydration of the concrete. The water capsules and their preparation method, the preparation method for and structure of the lightweight concrete of the present application are of unique design and strong practicability.

Fibers to be added to concrete to improve its properties are coated with an alkali-insoluble polymer, to provide adhesion of the fibers to the concrete. In a further improvement, nanoparticles are dispersed in an alkali-soluble polymer coating, and this is used to coat the fibers. When the fibers are mixed into the concrete mix, the nanoparticles are dispersed throughout the concrete, avoiding problems from agglomeration of the nanoparticles if simply added to the concrete mix.

Fibers to be added to concrete to improve its properties are coated with an alkali-insoluble polymer, to provide adhesion of the fibers to the concrete. In a further improvement, nanoparticles are dispersed in an alkali-soluble polymer coating, and this is used to coat the fibers. When the fibers are mixed into the concrete mix, the nanoparticles are dispersed throughout the concrete, avoiding problems from agglomeration of the nanoparticles if simply added to the concrete mix.

What is disclosed is a cellulose-based aggregate admix product and a method for producing the aggregate admix product that includes the steps of thoroughly hydrating cellulose fibers, mixing clay and mineral particulates with a liquid to produce an emulsion, adding the emulsion to the hydrated cellulose fibers, and thoroughly impregnating the cellulose fibers with components from the emulsion and producing an aggregate admix product.

This can be a method of making a high strength composite reinforcing fiber using flat GO flakes coated on a conventional reinforcing fiber. This maintains some the flexibility of the fiber and aligns the flat graphene flakes along the surface of the fiber; this dramatically increases the strength of the fiber. It also allows bonding between overlapping flakes, in contrast to flakes being uniformly dispersed in a host material that is being reinforced and dramatically increases the strength of the host material.

This can be a method of making a high strength composite reinforcing fiber using flat GO flakes coated on a conventional reinforcing fiber. This maintains some the flexibility of the fiber and aligns the flat graphene flakes along the surface of the fiber; this dramatically increases the strength of the fiber. It also allows bonding between overlapping flakes, in contrast to flakes being uniformly dispersed in a host material that is being reinforced and dramatically increases the strength of the host material.

A microcapsule of sustainable self-healing coal mine ventilation sealing material crack. The microcapsule includes a microcapsule core material and a microcapsule wall material. The microcapsule core material is prepared using a bacterial lyophilized powder and a substrate. By using urease-producing bacteria, there is provided a method of protecting bacteria to survive a long time in the cement-based material, supplying sufficient nutrient substances and reducing the impact of the doping of bacteria on the mechanical property of the cement-based material. The bacterial lyophilized powder and substrate are prepared into microcapsules which are added into the cement-based material when the cement-based material is mixed. In this case, once concrete cracks, the microcapsules breaks and the spores in the material are activated to perform normal metabolism so as to induce precipitation of calcium carbonate continuously, thereby continuously realizing self-healing of coal mine ventilation sealing material cracks.