E - Fixed Constructions – 04 – F
Patent
E - Fixed Constructions
04
F
400/1358, 9/67,
E04F 13/16 (2006.01) C04B 28/10 (2006.01) C04B 40/02 (2006.01) D21H 17/70 (2006.01)
Patent
CA 1143910
ABSTRACT The present invention relates generally to the manufacture of an asbestos free fibre reinforced carbonated building element by exposing, to the action of carbon dioxide, a shape formed from a slurry of cellulose fibres and a suitable oxide or hydroxide. The invention deals particularly with the case in which the element is a sheet, the hydroxide is slaked lime, the fibres are from waste newspapers, the carbon dioxide is from waste flue gases, and the properties are those normally associated with asbestos cement sheets - in which case the invention produces, from lime and waste products a sheet that can at least replace asbestos cement sheets in all building applications. The slurry is formed into the shape of the building element as a matted felt having a porosity before carbon- ation within the range 35 to 50%, interconnected pores the contain water, and a cellulose fibre amount in a preferred range of 7 to 40% by weight of solids. The invention has three prime objectives: the first is to achieve the properties of asbestos cement in the fibre carbonate building element. The second is to achieve a higher rate of carbonation than in the prior art. The third is to utilise waste material (e.g. flue gas and waste paper) thereby protecting the environment and preserving virgin resources. - 35 -
333129
Davis Michael
Moorehead David R.
Csr Limited
Fetherstonhaugh & Co.
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