Sheet material of fibre-reinforced cement

Details Sheet material of fibre-reinforced cement Sheet material of fibre-reinforced cement

C - Chemistry, Metallurgy

04

B

261/60, 9/65

C04B 14/42 (2006.01) C04B 28/04 (2006.01)

Patent

CA 1226589

ABSTRACT OF THE DISCLOSURE Sheet material, which may be flat or of profiled (e.g. corrugated) cross-section, suitable for use as building panels, e.g. roofing slates, is formed of a fibre reinforced cement composition comprising, in weight percentages:- Ordinary Portland cement 50 to 71% Pulverised fuel ash 14 to 40% Volatilised silica (containing at least 86% SiO2) 5 to 12% Filamentised chopped glass fibre strands 2 to 7% these components constituting at least 90% by weight of the composition, the material having a minimum average modulus of rupture of 16 N.mm-2 and a minimum density of 1.3 g.cm-3. The balance of the composition may include up to 4% by weight cellulose pulp and up to 5% of a plasticiser such as ball clay, bentonite or talc, together with small quantities of known dispersing agents and flocculating agents.

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