A method of manufacturing an expanded granular material comprises: forming a mixture comprising a silicate material, an alkali compound and water; curing the mixture to form a solid precursor; crushing and/or milling the solid precursor to form an expandable granular material; and heating the granular material to form an expanded granular material.

The invention comprises a cementitious material comprising a natural pozzolan selected from hyaloclastite, sideromelane or tachylite, wherein the natural pozzolan has a volume-based mean particle size of less than or equal to 40 μm. The cementitious material also comprising an aqueous alkaline activating solution suitable for forming a geopolymer. A method making a cementitious material is also disclosed.

The invention relates to a cement powder blend comprising, based on total weight 45-90 wt. % non-Portland cement; 5-30 wt. % polyvinylalcohol; the blend having a content of 0-25 wt. % siliceous fly ash; and 0-25 wt. % limestone, preferably polyvinylalcohol having a size distribution with D.sub.10=170-270 μm, D.sub.50=370-450 μm, D.sub.90=690-850 μm and D.sub.100=1000-1300 μm. Further the invention relates to concrete composed of a blend according to the invention and aggregate.

The invention relates to a cement powder blend comprising, based on total weight 45-90 wt. % non-Portland cement; 5-30 wt. % polyvinylalcohol; the blend having a content of 0-25 wt. % siliceous fly ash; and 0-25 wt. % limestone, preferably polyvinylalcohol having a size distribution with D.sub.10=170-270 μm, D.sub.50=370-450 μm, D.sub.90=690-850 μm and D.sub.100=1000-1300 μm. Further the invention relates to concrete composed of a blend according to the invention and aggregate.

Geopolymer cement slurries, cured geopolymer cements, and methods of making cured geopolymer cement and methods of using geopolymer cement slurries are provided. The geopolymer cement slurry comprises cement precursor material, Saudi Arabian volcanic ash, and an aqueous solution. The Saudi Arabian volcanic ash comprises SO.sub.3, CaO, SiO.sub.2, Al.sub.2O.sub.3, Fe.sub.2O.sub.3, MgO, and K.sub.2O.

Cement compositions that can capture carbon dioxide and related methods are generally described.

Cement compositions that can capture carbon dioxide and related methods are generally described.

Described are cementitious reagent materials produced from globally abundant inorganic feedstocks. Also described are methods for the manufacture of such cementitious reagent materials and forming the reagent materials as microspheroidal glassy particles. Also described are apparatuses, systems and methods for the thermochemical production of glassy cementitious reagents with spheroidal morphology. The apparatuses, systems and methods make use of an in-flight melting/quenching technology such that solid particles are flown in suspension, melted in suspension, and then quenched in suspension. The cementitious reagents can be used in concrete to substantially reduce the CO.sub.2 emission associated with cement production.

Suggested is a solid formed with Si, Al, Ca, O and at least one of Na and K, characterized in that in the .sup.27Al-MAS-NMR spectra of the solid compared to the .sup.27Al-MAS-NMR spectrum of calcium aluminate, an additional signal is present which has a chemical shift which lies between that of the main peak of calcium aluminate and that peak of calcium aluminate which is closest to the main peak in the higher field. 2.

Described are cementitious reagent materials produced from globally abundant inorganic feedstocks. Also described are methods for the manufacture of such cementitious reagent materials and forming the reagent materials as microspheroidal glassy particles. Also described are apparatuses, systems and methods for the thermochemical production of glassy cementitious reagents with spheroidal morphology. The apparatuses, systems and methods make use of an in-flight melting/quenching technology such that solid particles are flown in suspension, melted in suspension, and then quenched in suspension. The cementitious reagents can be used in concrete to substantially reduce the CO.sub.2 emission associated with cement production.