A traceable cement mixture includes a volume of cementitious material and a taggant disposed within the volume of cementitious material. The taggant includes data relating to a characteristic of the volume of cementitious material.

A traceable cement mixture includes a volume of cementitious material and a taggant disposed within the volume of cementitious material. The taggant includes data relating to a characteristic of the volume of cementitious material.

A system, method and composition for making a dental ceramics block. The system, method, and composition resulting in natural color matching without drying time between color layers. The system, method and composition also resulting in good color preparation on restorations of about 0.001 mm-1.000 mm thickness.

A system, method and composition for making a dental ceramics block. The system, method, and composition resulting in natural color matching without drying time between color layers. The system, method and composition also resulting in good color preparation on restorations of about 0.001 mm-1.000 mm thickness.

The present invention describes a hardening accelerating admixture for hydraulic binders, the accelerator being based on transition metal silicate hydrates having the general formula: aMe.sub.xO.sub.y bMO cAl.sub.2O.sub.3 SiO.sub.2 dH.sub.2O 1) whereMe represents a transition metal whose molar coefficient a is in a range between 0.001 and 2, preferably between 0.01 and 1; M represents an alkaline earth metal whose molar coefficient b is in a range between 0 and 2, preferably between 0.3 and 1.6; The molar coefficient c for Al.sub.2O.sub.3 is in a range between 0 and 2, preferably between 0.1 and 1; H.sub.2O represents the hydration water of the silicate hydrate whose molar coefficient d can vary within a wide range between 0.5 and 20; x and y can both be equal to 1 or different, depending on the valence of the transition metal, given that the valence of the oxygen atom in the metal oxide is equal to 2.

The present invention describes a hardening accelerating admixture for hydraulic binders, the accelerator being based on transition metal silicate hydrates having the general formula: aMe.sub.xO.sub.y bMO cAl.sub.2O.sub.3 SiO.sub.2 dH.sub.2O 1) whereMe represents a transition metal whose molar coefficient a is in a range between 0.001 and 2, preferably between 0.01 and 1; M represents an alkaline earth metal whose molar coefficient b is in a range between 0 and 2, preferably between 0.3 and 1.6; The molar coefficient c for Al.sub.2O.sub.3 is in a range between 0 and 2, preferably between 0.1 and 1; H.sub.2O represents the hydration water of the silicate hydrate whose molar coefficient d can vary within a wide range between 0.5 and 20; x and y can both be equal to 1 or different, depending on the valence of the transition metal, given that the valence of the oxygen atom in the metal oxide is equal to 2.

A method of manufacturing a concrete product includes providing a metal-based cementing agent including at least one of Fe.sub.2O.sub.3 and Fe.sub.3O.sub.4, an aqueous phosphoric acid cement reacting agent, an aggregate having at least one metallic oxide, a setting agent including at least one of Fe.sup.+2 and Mn.sup.+2, and an acid scavenging agent including at least one of K-feldspar and magnesium silicate. The method includes mixing the metal-based cementing agent, the cement reacting agent, the aggregate, the setting agent and the acid scavenging agent together to form a liquid concrete mixture, and placing the liquid concrete mixture in a form and allowing the liquid concrete mixture to set up and cure into the concrete product. The method can optionally include the additional step of placing the concrete product into an oven at a temperature of between 170 C. and 190 C.

A composite material used to form a concrete structure that includes a concrete matrix formed of a mixture of aggregates and a paste and a mixture of twisted steel micro-reinforcements (TSMRs) dispersed within the concrete matrix. The TSMRs have a variable twist pitch; wherein the twist pitch of a portion of the TSMRs is in the range of 6 to 20 twists per 25.4 mm (1 inch) applied along its longitudinal axis. The TSMRs are made from a common base stock and have the number of twists predetermined, such that the concrete structure exhibits at least 10% greater performance in one or more of a stress, deflection, energy, or crack mouth opening (CMOD) properties as determined through one or more defined standard tests than a similar concrete structure formed with the same amount by weight of steel fibers having one or two bends.