AS NZS 2908.2:2000 pdf free download – Cellulose-cement products Part 2: Flat sheets

AS NZS 2908.2:2000 pdf free download – Cellulose-cement products Part 2: Flat sheets.
The sheets are further classified into three categories according to their modulus of rupture.
The manufacturer shall declare the type and category of his product in his literature.
4.2 Type B
Type B sheets are not subjected to the type-tests and are intended for internal applications and external applications where they will not be subjected to the direct action of sun, rain and/or snow.
The sheets are further classified into five categories according to their modulus of rupture.
The manufacturer shall declare the type and category of his product in his literature.
NOTE I If sheets of type B are used in external applications where they are directly exposed to the weather but are protected (e.g. coating or impregnation), the weather resistance of the product is determined by the quality of the protection. Specification of this protection and methods for control and test are outside the scope of this International Standard.
5 Acceptance characteristics
5.1 Dimensional and geometrical characteristics
5.1.1 NomInal length and width
5.1.1.1 FIat fibre-cement sheets are normally available in nominal lengths up to 3 000 mm and nominal widths up to 1 250 mm. Sheets of greater nominal lengths and widths may be supplied.
5.1.1.2 Preferred nominal dimensions for length and width may be specified in national standards taking into account that the dimensions of the sheets are determined largely by the purpose for which they are intended.
NOTE 2 The nominal dimensions (width and length) specified in national standards may be increased by 20 mm to 30 mm (oversize sheets) for application where the sheet Is required to be cut by the user.
5.12 ThIckness
Flat fibre-cement sheets are normally available in thicknesses from 3 mm to 30 mm. although thicknesses outside this range may be supplied. Preferred thicknesses may be specified in national standards.
8.2.1.2 Preparation of specimens
Twenty specimens shall be cut from at least five sheets. Sheets which have provided specimens for other type-tests may be used.
Specimen dimensions shall be as required for the bending test in accordance with 8.1.2.1.1. The specimens shall be marked with the sheet number from which they were Cut and separated into two identical groups of 10 specimens each, one for equilibrium strength testing and one for wet strength testing.
In case of rectangular specimens care should be taken that each batch shall contain five specimens cut in one direction and five specimens cut in the other direction.
The test specimens shall be conditioned in accordance with the provisions of 81.2.1.3 and 81.2.1.4, as appropriate.
8.2.1.3 Test equipment and procedure
The bending strength test shall be carried out in accordance with the provisions of 8.1,21.
8.2.1.4 ExpressIon and InterpretatIon of results
The equilibrium modulus of rupture shall be the arithmetic mean of the test results obtained in the equilibrium condition. The wet modulus of rupture shall be the arithmetic mean of the test results obtained in the wet condition.
Assess the results against the specifications of 6.1.
8.2.2 Water permeability
8.2.2.1 PreparatIon of specimen
Three test specimens shall be cut, i.e. one from each of three sheets. Sheets used to provide specimens for other type•tests may be used or other sheets may be taken.
Specimen dimensions shall be 600 mm x 500 mm minimum except for narrow products when the dimensions shall be 600 mm x the maximum possible width.
8.2.2.2 Equipment
A suitable frame shall be sealed on top of the
specimen. The frame dimensions shall be
550 mm x 450 mm minimum. A narrow frame of the
same length shall be used for narrow products.
8.2.2.3 SpecImen condItionIng
The specimens shall be kept in a controlled environment for at least 7 days at ambient temperature (exceeding 5 °C).