The present invention relates to method for producing construction aggregate, comprising the steps of: (i) preparing materials, which comprises (% by weight): fly ash (80 to 99.75%); alkaline activator (0.25 to 20%); water (6 to 30% of total weight of fly ash and alkaline activator); (ii) mixing the alkaline activator with all the aforementioned water amount to create alkaline activator solution, after which will be mixed with fly ash to create geopolymer mortar; (iii) molding the geopolymer mortar with the compressive force of 2 MPa and more with desired dimension, wherein the molding is carried out with hydraulic pressing, extrusion, rolling or tablet lamination. (iv) solidifying; and (v) optionally, crushing the construction aggregate obtained above to a predefined dimension. Besides, the present invention relates to the construction aggregate from fly ash obtained by the above mentioned method.

The present invention has solved the problems of conventional molding materials, and provides a hydraulic composition for additive manufacturing devices having high strength development, particularly high early strength development, and less generation of gas defect and graphite spheroidization defect. Specifically, the hydraulic composition for additive manufacturing devices of the present invention at least contains calcium aluminate. It is preferable that the hydraulic composition contain 0.5-10 parts by mass of gypsum with respect to 100 parts by mass of the calcium aluminate.

The present invention has solved the problems of conventional molding materials, and provides a hydraulic composition for additive manufacturing devices having high strength development, particularly high early strength development, and less generation of gas defect and graphite spheroidization defect. Specifically, the hydraulic composition for additive manufacturing devices of the present invention at least contains calcium aluminate. It is preferable that the hydraulic composition contain 0.5-10 parts by mass of gypsum with respect to 100 parts by mass of the calcium aluminate.

The invention relates to a mineral binder suitable for use in binding aggregate in a mineral mortar or concrete mixture, said binder comprising the following components:

a) at least 40 wt % of calcined kaolinitic clay and ultrafine crushed CDW,
wherein the ratio between calcined clay and ultrafine crushed CDW is between 3:7 and 1:1 (w/w),
b) optionally 2-50 wt. % of a chemical activator; and
wherein the calcined kaolinitic clay, the ultrafine crushed CDW and the optionally present chemical activator are present in a combined amount of at least 90 wt. %, based on the total weight of the binder. The invention further relates to mineral mortar or concrete mixtures based on this mineral binder, as well as building units made from these mixtures.

The invention relates to a mineral binder suitable for use in binding aggregate in a mineral mortar or concrete mixture, said binder comprising the following components:

a) at least 40 wt % of calcined kaolinitic clay and ultrafine crushed CDW,
wherein the ratio between calcined clay and ultrafine crushed CDW is between 3:7 and 1:1 (w/w),
b) optionally 2-50 wt. % of a chemical activator; and
wherein the calcined kaolinitic clay, the ultrafine crushed CDW and the optionally present chemical activator are present in a combined amount of at least 90 wt. %, based on the total weight of the binder. The invention further relates to mineral mortar or concrete mixtures based on this mineral binder, as well as building units made from these mixtures.

In the field of decorative floor coverings, decorative panels are known having a MDF (Medium Density Board) or HDF (High Density Board) based core layer on top of which a decorative substrate is attached to provide the panels a desired appearance. The invention relates to a panel, in particular a decorative panel, a floor panel, a ceiling panel or a wall panel. The invention also relates to a floor covering consisting of a plurality of mutually coupled panels.

In the field of decorative floor coverings, decorative panels are known having a MDF (Medium Density Board) or HDF (High Density Board) based core layer on top of which a decorative substrate is attached to provide the panels a desired appearance. The invention relates to a panel, in particular a decorative panel, a floor panel, a ceiling panel or a wall panel. The invention also relates to a floor covering consisting of a plurality of mutually coupled panels.

Methods for making carbon-fiber reinforced geopolymer composites are provided. The methods produce metakaolin-based geopolymer composites in which multiwalled carbon nanotubes and/or carbon nanofibers are well dispersed in an metakaolin-based geopolymer matrix. The mixing protocols of the methods used to produce carbon-fiber reinforced geopolymer composites produce composites with reduced porosity, high elastic moduli, high strength, and/or high fracture toughness.

Methods for making carbon-fiber reinforced geopolymer composites are provided. The methods produce metakaolin-based geopolymer composites in which multiwalled carbon nanotubes and/or carbon nanofibers are well dispersed in an metakaolin-based geopolymer matrix. The mixing protocols of the methods used to produce carbon-fiber reinforced geopolymer composites produce composites with reduced porosity, high elastic moduli, high strength, and/or high fracture toughness.

A process for fireproofing materials, using the following steps: a) placing a material in contact with a viscoelastic suspension obtained by mixing a pozzolanic material with an alkaline activation solution having at least one soluble metal hydroxide; b) geopolymerizing the viscoelastic suspension; c) obtaining a fireproof material with a geopolymer.