The present invention discloses a micro-nano composite hollow structured nanometer material-modified high-durability concrete material, and according to mass parts, its raw material formula is as follows: cobaltosic oxide, 1000-1500 parts; cement, 1000-1300 parts; dioctyl sebacate, 1000-1500 parts; water, 800-1200 parts; nanocarbon, 1200-1800 parts; nano calcium carbonate, 35-50 parts; sodium silicate, 10-20 parts; micro-nano structured calcium molybdate, 50-80 parts; dipentaerythritol, 60-90 parts; and dioctyl ester 30-60 parts. The present invention enables existing concrete to be improved effectively and stably in terms of shrinkage, cracking resistance and rapid hardening; the synthetic chemical functional material may lower a chloride ion diffusion coefficient of the concrete by more than 50%, cut down shrinkage by more than 30%, and reduce the cracking risk of concrete products by 50%.

In one aspect of the present invention, a dental cement contains a glass powder, wherein the glass powder contains zinc, silicon, and fluorine and does not substantially contain aluminum.

A cementitious composition comprising a crystalline phase and an amorphous phase, and an activator selected from the group of materials comprising inorganic bases. In some cases the crystalline phase is gehlenite. In some cases the crystalline phase is anorthite. In some cases the amorphous phase is amorphous calcium aluminum silicate. In some cases the activator is elected from OPC (1-70 wt %), free lime (1-20 wt %), calcium hydroxide (1-20 wt %), and alkali hydroxides (NaOH, KOH 1 to 10 wt %), individually or in combination. A low lime cementitious material is cured by reaction with a curing reagent that includes a reagent chemical that is synthesized from CO.sub.2. Examples of such a reagent are oxalic acid and tartaric acid.

Treated perlite-based cementitious materials, concrete, and related techniques are disclosed. In accordance with some embodiments, a treated perlite-based cementitious material may be produced by intergrinding raw perlite ore, polyvinyl alcohol (PVA) powder, a polycarboxy late material, and (optionally) at least one of calcium sulfate (CaSO.sub.4) and calcium sulfite (CaSO.sub.3). In accordance with some embodiments, expanded perlite wastes and/or expanded perlite also may be included in the cementitious material. In accordance with some embodiments, raw perlite ore, expanded perlite wastes, and expanded perlite may be combined in providing a cementitious material. In at least some cases, the cementitious material may be provided as an all-in-one powder blend. In accordance with some embodiments, concrete may be produced by mixing the cementitious material with ordinary Portland cement (OPC), sand, rock, and water.

Treated perlite-based cementitious materials, concrete, and related techniques are disclosed. In accordance with some embodiments, a treated perlite-based cementitious material may be produced by intergrinding raw perlite ore, polyvinyl alcohol (PVA) powder, a polycarboxy late material, and (optionally) at least one of calcium sulfate (CaSO.sub.4) and calcium sulfite (CaSO.sub.3). In accordance with some embodiments, expanded perlite wastes and/or expanded perlite also may be included in the cementitious material. In accordance with some embodiments, raw perlite ore, expanded perlite wastes, and expanded perlite may be combined in providing a cementitious material. In at least some cases, the cementitious material may be provided as an all-in-one powder blend. In accordance with some embodiments, concrete may be produced by mixing the cementitious material with ordinary Portland cement (OPC), sand, rock, and water.

The present invention provides an admixture composition comprising a liquid suspension of colloidal silica, siloxane, and polycarboxylate polymer cement dispersant for enhancing early age strength, finishability, and other properties in hydratable cementitious compositions such as concrete (e.g., shotcrete). An inventive method involves mixing the components together in a specific sequence, thereby to obtain a stable liquid suspension. This attainment of a stable liquid suspension is surprising and unexpected because (i) the polycarboxylate polymer cement dispersant and siloxane components are incompatible and immiscible with one another; and (ii) that colloidal silica and siloxane compound are incompatible and immiscible with one another. Yet, the present inventors achieved an additive in the form of a stable liquid suspension which can be conveniently dosed into concretes and shotcrete mixtures, to enhance early age strength, and to improve workability and rheology in terms of finishability of concrete surfaces and improved rebound performance in shotcrete applications.

The present invention provides an admixture composition comprising a liquid suspension of colloidal silica, siloxane, and polycarboxylate polymer cement dispersant for enhancing early age strength, finishability, and other properties in hydratable cementitious compositions such as concrete (e.g., shotcrete). An inventive method involves mixing the components together in a specific sequence, thereby to obtain a stable liquid suspension. This attainment of a stable liquid suspension is surprising and unexpected because (i) the polycarboxylate polymer cement dispersant and siloxane components are incompatible and immiscible with one another; and (ii) that colloidal silica and siloxane compound are incompatible and immiscible with one another. Yet, the present inventors achieved an additive in the form of a stable liquid suspension which can be conveniently dosed into concretes and shotcrete mixtures, to enhance early age strength, and to improve workability and rheology in terms of finishability of concrete surfaces and improved rebound performance in shotcrete applications.

An environmentally friendly composition of matter comprising a limestone and fiberglass based waste material used to substitute out a portion of natural aggregate with said waste material so as to preserve natural resources, protect the environment and prevent depletion of landfill capacity and reuse unusable waste products into environmentally useful products.

An environmentally friendly composition of matter comprising a limestone and fiberglass based waste material used to substitute out a portion of natural aggregate with said waste material so as to preserve natural resources, protect the environment and prevent depletion of landfill capacity and reuse unusable waste products into environmentally useful products.

Methods to improve the workability of a mineral binder composition include at least one mineral binder and additionally recycled powder, said methods comprising the steps of providing at least one mineral binder, admixing recycled powder, admixing at least one workability improver selected from the group consisting of polycarboxylates, lignosulphonates, sugar acids, sugars, or mixtures thereof, and admixing water.