The present invention relates to a device for heat-treating solid material, in particular in granular form, wherein the device comprises a kiln and an external heat generator, wherein said kiln comprises at least one sloped sliding surface on which a bed of said solid material slides down within said kiln due to gravity while a hot gas generated by the external heat generator is led through said solid material to heat said solid material to a desired temperature in order to change the substance properties of said solid material. According to the invention, said external heat generator for generating said hot gas is external to said kiln, wherein said kiln further comprises at least one kiln gas inlet through which said hot gas enters said kiln, such that the necessary temperature of said hot gas can be controlled precisely in that said hot gas is generated in said external heat generator, ensuring that the solid material does not experience temperatures above an allowed maximum temperature, and further such that the solid material is not exposed to radiation from a burner.

A blended particulate composition includes: a blended supplementary cementitious material (SCM) formed by intergrinding: an SCM selected from the group consisting of calcined clay, metakaolin, fly ash, bottom ash, shale dust, metallurgical slags, waste glass, and combinations thereof; and a non-lime-bearing material selected from the group consisting of limestone that has not been calcined to form calcium oxide (CaO), fine aggregate, sand, basalt, sinters, ceramics, recycled bricks, recycled concrete, and refractory materials; and at least one of a calcium-based cement or calcium-based set accelerator. The calcium-based cement may include Portland cement and the calcium-based set accelerator may include calcium oxide (CaO), calcium chloride (CaCl.sub.2), calcium nitrite (Ca(NO.sub.2).sub.2, or calcium nitrate (Ca(NO.sub.3).sub.2.

A blended particulate composition includes: a blended supplementary cementitious material (SCM) formed by intergrinding: an SCM selected from the group consisting of calcined clay, metakaolin, fly ash, bottom ash, shale dust, metallurgical slags, waste glass, and combinations thereof; and a non-lime-bearing material selected from the group consisting of limestone that has not been calcined to form calcium oxide (CaO), fine aggregate, sand, basalt, sinters, ceramics, recycled bricks, recycled concrete, and refractory materials; and at least one of a calcium-based cement or calcium-based set accelerator. The calcium-based cement may include Portland cement and the calcium-based set accelerator may include calcium oxide (CaO), calcium chloride (CaCl.sub.2), calcium nitrite (Ca(NO.sub.2).sub.2, or calcium nitrate (Ca(NO.sub.3).sub.2.

A method of calcining a clay material for use as a supplementary cementitious material, includes providing a raw clay material, optionally drying the raw clay material, granulating the raw clay material in order to obtain raw clay granules, calcining the raw clay granules to obtain calcined clay granules, and grinding the calcined clay granules to obtain a pulverulent supplementary cementitious material.

A method of calcining a clay material for use as a supplementary cementitious material, includes providing a raw clay material, optionally drying the raw clay material, granulating the raw clay material in order to obtain raw clay granules, calcining the raw clay granules to obtain calcined clay granules, and grinding the calcined clay granules to obtain a pulverulent supplementary cementitious material.

A method of preparing an enhanced reactivity pozzolan may include: contacting a starting pozzolan with a catalyst material to form a mixture of the starting pozzolan and the catalyst material; reacting the mixture of starting pozzolan and catalyst material during an induction period to form reaction products; and recovering the enhanced reactivity pozzolan.

A method of preparing an enhanced reactivity pozzolan may include: contacting a starting pozzolan with a catalyst material to form a mixture of the starting pozzolan and the catalyst material; reacting the mixture of starting pozzolan and catalyst material during an induction period to form reaction products; and recovering the enhanced reactivity pozzolan.