Glass fiber reinforced cement composite materials
AssigneePilkington Brothers Limited
InventorIan Robert Kennedy Greig
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Abstract
Glass fiber reinforced cement composite materials are made by first preparing a cement slurry from a cement/water mix by a high shear mixing process which breaks up cement agglomerates into their primary particles, and then mixing chopped strands of glass fiber into the cement slurry by a low shear mixing process which restricts damage to the glass filaments to a minimum. Both the high shear and low shear processes may be carried out in the same impeller-type mixer using different power inputs and impeller speeds.
Claims6
In a method of making a glass fibre reinforced cement composite material in which chopped strands of glass filaments are mixed into a cement slurry which is then poured into a mould and allowed to cure, the improvement which consists in first preparing the cement slurry without filaments from a cement/water mix by a high shear mixing process using a mixer to which the power input is at least 5 KW/100 Kg of slurry, so that cement agglomerates are broken up into their primary particles, and then adding the chopped strands of glass filaments into the cement slurry during a relatively low shear mixing process using a mixer to which the power input is 1 KW/100 Kg of slurry or less to avoid separation of the strands into individual, filaments.
Dependencies are inferred from the claim text.