Cement-SCM blends employ particle packing principles to increase particle packing density and reduce interstitial spacing between the cement and SCM particles. Particle packing reduces the amount of water required to obtain a cement paste having a desired flow, lowers the water-cementitious material ratio (w/cm), and increases early and long-term strengths. This may be accomplished by providing a hydraulic cement fraction having a narrow PSD and at least one SCM fraction having a mean particle size that differs from the mean particle size of the narrow PSD cement by a multiple of 3.0 or more to yield a cement-SCM blend having a particle packing density of at least 57.0%.

A liquid accelerator composition for accelerating the setting reaction of calcium sulfate hemihydrate and water and methods of forming a liquid gypsum accelerator are provided. The liquid accelerator composition includes a liquid media in which calcium sulfate dihydrate is less than fully soluble and a ground product of a mill grinding of a mixture comprising calcium sulfate dihydrate.

A liquid accelerator composition for accelerating the setting reaction of calcium sulfate hemihydrate and water and methods of forming a liquid gypsum accelerator are provided. The liquid accelerator composition includes a liquid media in which calcium sulfate dihydrate is less than fully soluble and a ground product of a mill grinding of a mixture comprising calcium sulfate dihydrate.

A method of providing a reactive cement constituent or concrete additive includes at least the following steps: a) reworking a carbon-containing heap comprising at least coal and clay-bearing rock; b) extracting at least calcined rock; c) producing fine-grain calcined rock; and d) providing fine-grain calcined rock for use as cement constituent or concrete additive.

A method of providing a reactive cement constituent or concrete additive includes at least the following steps: a) reworking a carbon-containing heap comprising at least coal and clay-bearing rock; b) extracting at least calcined rock; c) producing fine-grain calcined rock; and d) providing fine-grain calcined rock for use as cement constituent or concrete additive.

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.

A concrete composition that includes (i) a treated palm oil fuel ash, wherein the treated palm oil fuel ash is the only binder present, (ii) a fine aggregate, (iii) a coarse aggregate, and (iv) an alkali activator containing an aqueous solution of sodium hydroxide and sodium silicate. A cured concrete made from the concrete composition is also disclosed with advantageous compressive strength properties.

A concrete composition that includes (i) a treated palm oil fuel ash, wherein the treated palm oil fuel ash is the only binder present, (ii) a fine aggregate, (iii) a coarse aggregate, and (iv) an alkali activator containing an aqueous solution of sodium hydroxide and sodium silicate. A cured concrete made from the concrete composition is also disclosed with advantageous compressive strength properties.

According to the present invention, there is provided a wet accelerator for use in the manufacture of a gypsum product, said wet accelerator comprising water, particles of calcium sulphate dihydrate and a stabiliser. Additionally, a method of preparing a wet accelerator and a method of producing a gypsum product are described.