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Improvements in and relating to board products
| Details |
Inventors: Occleshaw, John E.; Smith, Terence D.;
Assignee: TAC Construction Materials Ltd. (Manchester, EN)
Primary Examiner: Ansher; Harold
Assistant Examiner:
Attorney, Agent or Firm: Cushman, Darby & Cushman
A fire-resistant board product is comprised of a hydraulic cement binder reinforced by a mixture of long and short staple vitreous fibres, silica in an amount at least sufficient to react with the free lime in the cement, together with from 1 to 10% by weight of a cellulosic fibre. Optionally, the board product further includes at least one low density filler which may provide at least part of the silica component. |
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DETAILED DESCRIPTION We claim: 1.
An autoclaved fire-resistant board product consisting essentially of, in combination, a hydraulic cement binder, water, a mixture of long and short staple vitreous fibres, from 1 to 10% by weight of a cellulosic fibre, together with chemically reactive silica in an amount sufficient to react with the free lime remaining in the product after reaction between the cement and the water.
2.
A fire-resistant board product according to claim 1, wherein up to 75% of the cellulosic fibre content is replaced by an organic synthetic fibre.
3.
A fire-resistant board product according to claim 1, wherein the cellulosic fibre content is in the range from 1 to 5% by weight.
4.
A fire-resistant board product according to claim 1, wherein at least some of the vitreous fibre is derived from molten rock or slag.
5.
A fire-resistant board product according to claim 1, wherein the vitreous fibre is glass fibre.
6.
A fire-resistant board product according to claim 1, wherein the vitreous fibre is alkali resistant.
7.
A fire-resistant board product according to claim 1, including up to 25% by weight of short staple vitreous fibre.
8.
A fire-resistant board product according to claim 1, including an inert low density filler.
9.
A fire-resistant board product according to claim 8, wherein at least part of the silica component is provided by a low density filler.
10.
A fire-resistant board product according to claim 8 including perlite as low density filler.
11.
A fire-resistant board product according to claim 9 wherein the silica-containing low density filler is diatomite.
12.
A method of making a fire-resistant board product comprising the steps of mixing short staple vitreous fibre, long staple vitreous fibre, hydraulic cement, silica, cellulosic fibre and water in a beater to form a slurry, sheet off the slurry to form a wet board which is then consolidated, allowed to stand at ambient temperature, autoclaved, and stoved.
13.
A method according to claim 12 including the step of milling vitreous fibre to produce the short staple length
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