Durable medium-density fibre cement composite
First Claim
1. A method of modifying the properties of a low or medium density FRC product comprising providing the low or medium density FRC product with a predetermined pore size distribution such that in particular critical zones of said distribution, the pore volume is substantially equivalent to or less than the pore volume in a respective critical zone of a conventional high density FRC product.
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Accused Products
Abstract
A cementitious product and method of modifying the properties of a low or medium density FRC product by providing a predetermined pore size distribution. The pore size distribution is obtained such that in critical zones of the distribution, the pore volume is substantially equivalent to or less than the pore volume in a respective critical zone of a conventional high density FRC product. The resultant material provides improved properties over conventional medium density FRC products, in particular improved freeze/thaw durability and/or improved workability.
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Citations
32 Claims
- 1. A method of modifying the properties of a low or medium density FRC product comprising providing the low or medium density FRC product with a predetermined pore size distribution such that in particular critical zones of said distribution, the pore volume is substantially equivalent to or less than the pore volume in a respective critical zone of a conventional high density FRC product.
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14. A method of providing a low or medium density FRC product, comprising the steps of:
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i) providing a formulation for a low or medium density product;
ii) forming a green article from said formulation;
iii) curing said green article to form said product;
wherein prior to step iii) a) one or more pore size modifying agents are added to the formulation and/or b) the green shaped article is subjected to a light press such that the pore volume of the product is reduced as compared with a conventional product emanating from steps i) to iii), while maintaining a density of no greater than about 1.6 g/cm3. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A method of modifying the properties of a low or medium density FRC article comprising adjusting the pore size distribution of the article such that over at least one particular pore size range, the total pore volume is no greater than about 150% of the pore volume in a corresponding pore size range of a conventional high density FRC product.
- 29. A cementitious product comprising a body constructed from fibre reinforced cement and having a density of no more than about 1.6 grams/cm3 wherein the product has a predetermined pore size distribution such that in particular critical zones of said distribution, the pore volume is substantially equivalent to or less than the pore volume in a respective critical zone of a conventional high density FRC product.
Specification