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.

The present invention relates to the field of cementitious compositions. Particularly, the invention concerns an alkaline-activated fly ash cementitious composition and the use of this composition as a binder in concrete production.

The present invention relates to the field of cementitious compositions. Particularly, the invention concerns an alkaline-activated fly ash cementitious composition and the use of this composition as a binder in concrete production.

The present invention relates to a mechanically carboxylated fly ash which has a BET surface area of less than 50 m.sup.2/g and a CO.sub.2 content of more than 1 wt. %. The invention further relates to methods of its production and uses thereof, for example as a filler. The invention further relates to compositions comprising the mechanically carboxylated fly ash and a further material selected from the group consisting of asphalt, cement, polymers and combinations thereof and methods of their production.

The present invention relates to a mechanically carboxylated fly ash which has a BET surface area of less than 50 m.sup.2/g and a CO.sub.2 content of more than 1 wt. %. The invention further relates to methods of its production and uses thereof, for example as a filler. The invention further relates to compositions comprising the mechanically carboxylated fly ash and a further material selected from the group consisting of asphalt, cement, polymers and combinations thereof and methods of their production.

The present invention relates to compositions comprising a mechanochemically carboxylated mineral filler and a binder, wherein the binder is cement and/or asphalt and wherein the filler is obtainable by mechanochemically carboxylating a silicate mineral. The invention further relates to a method for preparing said compositions. The invention further relates to a method for preparing concrete from these compositions and to the concrete obtainable from said method for preparing concrete. The invention also relates to uses of the mechanochemically carboxylated mineral filler, for example as a filler in asphalt or cement.

The present invention relates to compositions comprising a mechanochemically carboxylated mineral filler and a binder, wherein the binder is cement and/or asphalt and wherein the filler is obtainable by mechanochemically carboxylating a silicate mineral. The invention further relates to a method for preparing said compositions. The invention further relates to a method for preparing concrete from these compositions and to the concrete obtainable from said method for preparing concrete. The invention also relates to uses of the mechanochemically carboxylated mineral filler, for example as a filler in asphalt or cement.

Method for the production of granular materials designed to be used as aggregates and fillers in a mix containing a binder for the manufacture of articles in slab or block form. The method comprises a step of melting a mixture of selected minerals having a specific chemical composition, a step of casting the molten material, a step of cooling the cast material until a predetermined temperature is reached and a step of crushing and/or grinding the cooled material to obtain granular materials having a selected particle size and suitable for use as aggregates or fillers in the mix for the manufacture of articles in slab or block form. Moreover, the method comprises, upstream of the melting step, a step for recovery and collection of the manufacturing waste of other previously manufactured articles. The manufacturing waste is designed to compose at least partially the mixture of selected minerals. The invention also relates to a method for manufacturing articles in slab or block form from a mix containing the aggregates and the fillers and a binder.

Method for the production of granular materials designed to be used as aggregates and fillers in a mix containing a binder for the manufacture of articles in slab or block form. The method comprises a step of melting a mixture of selected minerals having a specific chemical composition, a step of casting the molten material, a step of cooling the cast material until a predetermined temperature is reached and a step of crushing and/or grinding the cooled material to obtain granular materials having a selected particle size and suitable for use as aggregates or fillers in the mix for the manufacture of articles in slab or block form. Moreover, the method comprises, upstream of the melting step, a step for recovery and collection of the manufacturing waste of other previously manufactured articles. The manufacturing waste is designed to compose at least partially the mixture of selected minerals. The invention also relates to a method for manufacturing articles in slab or block form from a mix containing the aggregates and the fillers and a binder.

The present invention relates to a lead free glossy finish hybrid radiation shielding composite panel comprising: a) 40-70% of industrial waste red mud and 30-60% of epoxy/polyester resin with or without glass fibre, wherein the composite panel has density in the range of 1.4-2.2 g/cc; water absorption in the range of 0.20-0.30%; tensile strength in the range of 12-120 MPa; tensile modulus in the range of 1.5-7.5 GPa; and half value layer in the range of 0.36-0.47 cm and 0.48-0.52 cm for X-ray beam energies of 60 and 100 kVp, respectively. The present invention also describes a low temperature process for manufacturing the composite panels. Moreover, the developed composite panel is a unique material and have multifunctional applications in wider spectrum as high energy electromagnetic radiation shielding doors, panels, partition panels and as roofing sheets.