Patent ID: 7892352
Filing Date: 2011-02-22
Classification: C04B,C09K,Y02W,Y10S

Abstract:
1. A cement composition consisting essentially of: hydraulic cement consisting essentially of at least one cement selected from the group consisting of API Class A Portland cement, API Class C Portland cement, API Class G Portland cement, API Portland Class H cement, a pozzolana cement, a gypsum cement, a high alumina content cement, a slag cement, a silica cement, and any combination thereof; water; particulate nano-silica having a particle size in the range of from about 1 nanometer to about 100 nanometers and present in an amount in the range of from about 1% to about 25% by weight of the hydraulic cement on a dry basis; and at least one additive selected from the group consisting of nano-alumina, nano-zinc oxide, nano-boron, nano-iron oxide, crystalline silica, amorphous silica, salt, fiber, a hydratable clay, vitrified shale, a microsphere, lime, latex, a thixotropic additive, and any combination thereof.