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A platform for research: civil engineering, architecture and urbanism
Cellulosics to reinforce cement
Short notice given only substantially as follows: An Australian company claims to have found a way to exploit cellulosic fibres as reinforcements for cement. In US Patent 6 872 246, James Hardie Research Pty Ltd proposes that loaded cellulosic fibres be used. Normally, the Patent notes, the alkaline nature of the cement would cause the cellulosic fibres to degrade rapidly. The technique envisages removal of most of the lignin and so enables individual fibres to be separated, after which they are mechanically pulped. The fibres are prepared in a so-called hydra-pulper and are subsequently dispersed to a consistency in the range 1-6%, after which the fibres are fibrillated to 100-750 degrees of Canadian Standard Freeness and then to a level of 180-650 degrees. In this way, fibres containing voids are created where insoluble substances are deposited. These loaded fibres are then flash-dried until they have a moisture content of 5-50 %. Then these may be mixed with unloaded cellulosic fibres and with inorganic and/or synthetic fibres. Finally, these can be formed into a fibre-cement article. The technique can be used to make cellulosic fibrereinforced composites used as building materials that exhibit a reduced rate of water absorption, and lower water migration and permeability. (The insoluble substances within the voids of the delignified fibres inhibit water migration.) The Patent also claims that the new products have enhanced rot- and fire-resistance and are more resistant to freezing and thawing.
Cellulosics to reinforce cement
Short notice given only substantially as follows: An Australian company claims to have found a way to exploit cellulosic fibres as reinforcements for cement. In US Patent 6 872 246, James Hardie Research Pty Ltd proposes that loaded cellulosic fibres be used. Normally, the Patent notes, the alkaline nature of the cement would cause the cellulosic fibres to degrade rapidly. The technique envisages removal of most of the lignin and so enables individual fibres to be separated, after which they are mechanically pulped. The fibres are prepared in a so-called hydra-pulper and are subsequently dispersed to a consistency in the range 1-6%, after which the fibres are fibrillated to 100-750 degrees of Canadian Standard Freeness and then to a level of 180-650 degrees. In this way, fibres containing voids are created where insoluble substances are deposited. These loaded fibres are then flash-dried until they have a moisture content of 5-50 %. Then these may be mixed with unloaded cellulosic fibres and with inorganic and/or synthetic fibres. Finally, these can be formed into a fibre-cement article. The technique can be used to make cellulosic fibrereinforced composites used as building materials that exhibit a reduced rate of water absorption, and lower water migration and permeability. (The insoluble substances within the voids of the delignified fibres inhibit water migration.) The Patent also claims that the new products have enhanced rot- and fire-resistance and are more resistant to freezing and thawing.
Cellulosics to reinforce cement
2005
2 Seiten
Article (Journal)
English
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