A description is given of the use of an additive mixture (A) for combination with a solution or dispersion (B) comprising waterglass, for producing a moulding material mixture for producing articles from the group consisting of foundry moulds and foundry cores; a multi-component binder system comprising (A) an additive mixture and (B) a solution or dispersion comprising waterglass; a moulding material mixture comprising a mould base material (C) and also components (A) and (B) of such a multi-component binder system; a method for producing an article from the group consisting of foundry moulds and foundry cores; articles from the group consisting of foundry moulds and foundry cores; and the use of such an article for metal casting, preferably for light metal casting, more particularly for aluminium casting.

A description is given of the use of an additive mixture (A) for combination with a solution or dispersion (B) comprising waterglass, for producing a moulding material mixture for producing articles from the group consisting of foundry moulds and foundry cores; a multi-component binder system comprising (A) an additive mixture and (B) a solution or dispersion comprising waterglass; a moulding material mixture comprising a mould base material (C) and also components (A) and (B) of such a multi-component binder system; a method for producing an article from the group consisting of foundry moulds and foundry cores; articles from the group consisting of foundry moulds and foundry cores; and the use of such an article for metal casting, preferably for light metal casting, more particularly for aluminium casting.

A fire-proof material, in particular a fire-proof thermal insulation material containing water glass, which is composed of a compound which contains 34 to 49.9 wt % of inorganic non-flammable fibres, 50 to 65 wt % of an aqueous silicate solution, and 0.1 to 1 wt % of water glass stabiliser, while it further contains a water glass hardener and the aqueous silicate solution has a density in the range of 1370 to 1400 kg/m.sup.3 and a molar ratio of SiO.sub.2 to Na.sub.2O in the range of 3.2 to 3.4.

A fire-proof material, in particular a fire-proof thermal insulation material containing water glass, which is composed of a compound which contains 34 to 49.9 wt % of inorganic non-flammable fibres, 50 to 65 wt % of an aqueous silicate solution, and 0.1 to 1 wt % of water glass stabiliser, while it further contains a water glass hardener and the aqueous silicate solution has a density in the range of 1370 to 1400 kg/m.sup.3 and a molar ratio of SiO.sub.2 to Na.sub.2O in the range of 3.2 to 3.4.

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.

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.

Objects made of waterglass-bonded sand, methods of making such objects and kits useful for making such objects. In some embodiments, an object according to the teachings herein is a final goods (as opposed to being an intermediate goods) such as a toy, a medallion, a building block, furniture, a wall, a portion of a sand castle and a sand castle.

Objects made of waterglass-bonded sand, methods of making such objects and kits useful for making such objects. In some embodiments, an object according to the teachings herein is a final goods (as opposed to being an intermediate goods) such as a toy, a medallion, a building block, furniture, a wall, a portion of a sand castle and a sand castle.

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.