A fire insulation precursor material formed of cement, in an amount of between 10-30% w/w; and an aluminium or magnesium hydroxide, huntite or hydromagnesite in an amount of between 60-90% w/w. A fire insulation material is provided including the previously mentioned precursor material. Further described are methods of forming a fire insulation material and applications for such material in sheaths, duct coatings, cable trays and other elongate components.

A composition consisting essentially of (a) 1 to 30% by weight of a 1 to 90% by weight aqueous phosphoric acid and/or a hydrogen phosphate; (b) 1 to 40% by weight of a compound selected from the group of oxides, hydroxides and oxide hydrates of magnesium, calcium, iron, zinc and copper; (c) 40 to 95% by weight of a particulate filler selected from the group of glass; mono-, oligo- and polyphosphates of magnesium, calcium, barium and aluminium; calcium sulphate; barium sulphate; simple and complex silicates; simple and complex aluminates; simple and complex titanates; simple and complex zirconates; zirconium dioxide; titanium dioxide, aluminium oxide; silicon oxide; silicon carbide; aluminium nitride; boron nitride and silicon nitride; (d) 1 to 10% by weight of an urea compound selected from the group consisting of imidazolidine-2-on, allantoin and imidazolidinyl urea; and (e) 0 to 15% by weight of a component differing from (a) to (d).

A composition consisting essentially of (a) 1 to 30% by weight of a 1 to 90% by weight aqueous phosphoric acid and/or a hydrogen phosphate; (b) 1 to 40% by weight of a compound selected from the group of oxides, hydroxides and oxide hydrates of magnesium, calcium, iron, zinc and copper; (c) 40 to 95% by weight of a particulate filler selected from the group of glass; mono-, oligo- and polyphosphates of magnesium, calcium, barium and aluminium; calcium sulphate; barium sulphate; simple and complex silicates; simple and complex aluminates; simple and complex titanates; simple and complex zirconates; zirconium dioxide; titanium dioxide, aluminium oxide; silicon oxide; silicon carbide; aluminium nitride; boron nitride and silicon nitride; (d) 1 to 10% by weight of an urea compound selected from the group consisting of imidazolidine-2-on, allantoin and imidazolidinyl urea; and (e) 0 to 15% by weight of a component differing from (a) to (d).

A cementing composition may include a sulfate-resistant cement and fly ash. The sulfate-resistant cement may contain calcium magnesium aluminum oxide silicate, brownmillerite, dolomite, periclase, and quartz. The composition may contain the fly ash in an amount in the range of 10 to 40 wt. %. The sulfate-resistant cement may contain the calcium magnesium aluminum oxide silicate in an amount of the range of 45 to 60 wt. %.

A cementing composition may include a sulfate-resistant cement and fly ash. The sulfate-resistant cement may contain calcium magnesium aluminum oxide silicate, brownmillerite, dolomite, periclase, and quartz. The composition may contain the fly ash in an amount in the range of 10 to 40 wt. %. The sulfate-resistant cement may contain the calcium magnesium aluminum oxide silicate in an amount of the range of 45 to 60 wt. %.

A low strength backfill material having a 28 days compressive strength less than approximately 2.0 MPa is provided. The backfill is suitable for use in areas with dense underground utilities due to its high excavatability and good thermal conductivity. The backfill includes a cementitious binder of approximately 1 weight percent to approximately 10 weight percent and fine aggregates in an amount of approximately 40 to approximately 75 weight percent. Filler is provided at 20 microns to approximately 100 microns for high flowability. A density-controlling agent of 0.0001-5 weight percent is used such that the density of a cured backfill material is approximately 1600 kg/m.sup.3 to 2000 kg/m.sup.3. Thermally conductive particles having a size range of approximately 0.01 microns to 500 microns in an amount of approximately 0.1 to 10 weight percent are evenly dispersed throughout the backfill.

A low strength backfill material having a 28 days compressive strength less than approximately 2.0 MPa is provided. The backfill is suitable for use in areas with dense underground utilities due to its high excavatability and good thermal conductivity. The backfill includes a cementitious binder of approximately 1 weight percent to approximately 10 weight percent and fine aggregates in an amount of approximately 40 to approximately 75 weight percent. Filler is provided at 20 microns to approximately 100 microns for high flowability. A density-controlling agent of 0.0001-5 weight percent is used such that the density of a cured backfill material is approximately 1600 kg/m.sup.3 to 2000 kg/m.sup.3. Thermally conductive particles having a size range of approximately 0.01 microns to 500 microns in an amount of approximately 0.1 to 10 weight percent are evenly dispersed throughout the backfill.

In the present disclosure, a cement board is disclosed. The cement board comprises a core having a first surface and a second surface opposite the first surface and a binder including a pozzolan material and a water-resistant additive, wherein the water-resistant additive is present in an amount of less than 5 wt. % based on the weight of the pozzolan material.

In the present disclosure, a cement board is disclosed. The cement board comprises a core having a first surface and a second surface opposite the first surface and a binder including a pozzolan material and a water-resistant additive, wherein the water-resistant additive is present in an amount of less than 5 wt. % based on the weight of the pozzolan material.

The present invention pertains to a phosphate cement composition and process for making such composition. More particularly, it pertains to a phosphate cement coating and process for making the coating for application to a given substrate.