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1、INTERNATIONAL STANDARD INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION MEXAYHAPOAHAR OPrAHM3AuMR I-IO CTAHAAPTM3AMM Cement-bonded particleboards - Boards of Portland or equivalent cement reinforced with fibrous wood particles Panneaux de particules B liant
2、 cimen t - Panneaux en ciment Portland ou Equivalent renforc.4 par des particules fibreuses de bois IS0 8335 First edition 1987-11-U Reference number IS0 8335 : 1987 (Ei) Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 mem
3、ber bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- m
4、ental and non-governmental, in liaison with ISO, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the IS0 Council, They are approved in accordance with
5、IS0 procedures requiring at least 75 % approval by the member bodies voting. International Standard IS0 8335 was prepared by Technical Committee ISO/TC 77, Products in fibre reinforced cement. Users should note that all International Standards undergo revision from time to time and that any referenc
6、e made herein to any other International Standard implies its latest edition, unless otherwise stated. 0 lnternatlonal Organlzation for Standardization, 1987 0 Printed in Switzerland ii -,-,- IS0 8335 : 1987 (El Contents Page 1 Scope and field of application . 1 2 References . 1 3 General compositio
7、n. 1 4 General appearance and finish 1 5 Characteristics 1 5.1 Geometrical characteristics . 1 5.2 Mechanical characteristics 2 5.3 Physical characteristics . 2 6 Testmethod 2 6.2 General test conditions . 2 6.2 Geometrical controls . s . 2 6.3 Physicaltests . 3 6.4 Mechanical tests 5 7 Marking . 7
8、8 Conformity with standards . 7 Annexes A Receiving inspection for products which are not subject to third-party certification . . . 8 B Third-party certification. . 8 C Method for determining screw-holding power . 9 INTERNATIONAL STANDARD IS0 8335 : 1987 (E) Cement-bonded particleboards - Boards of
9、 Portland or equivalent cement reinforced with fibrous wood particles 1 Scope and field of application This International Standard specifies the characteristics of compressed cement-bonded particleboards and establishes the test methods for determination and control of the specified values. These pr
10、oducts are suitable for all internal applications, such as partitions, ceilings, etc. For boards intended for applications exposed to the weather or moisture, special requirements apply (see 5.3). 2 References IS0 390, Asbestos-cement products - Sampling and inspeo tion. IS0 1006, Building construct
11、ion - Modular coordination - Basic module. 3 General composition Cement-bonded particleboards consist essentially of a mixture of fibrous wood particles and Portland cementt), or other cements with equivalent properties, to which other fibres, fillers and pigments may be added. Care should however b
12、e taken to exclude materials which have a deleterious effect on the product or its fastening (e.g. corrosionl. The fibrous wood particles are chips or shavings with typical sizes up to 15 mm in length, 3 mm in width and 0,3 mm in thickness, and used in amounts up to 30 % by dry weight. This Internat
13、ional Standard does not cover products made wholly or partly with magnesite binder. 4 General appearance and finish The board shall have a dense structure with a smooth, flat sur- face on both sides. 1) As defined by national standards. 5 Characteristics 5.1 Geometrical characteristics 5.1.1 Dimensi
14、ons2) The preferred standard range of sizes is as follows : a) length, I : 24OOto36UOmm b) width, I, : 900to125Omm c) thickness, e : 6 mm e 40 mm 5.1.2 Tolerances on dimensions Tolerances on dimensions are as follows : a) on length and width : + 5 mm (the measurement method is given in 6.2.2) b) on
15、thickness : 6mm e 12mm: + 1,Omm 12mm e 20mm: + 1,5mm 20mme : + 2,0 mm for sanded products : If: 0,3 mm (the measurement method is given in 6.2.3) 5.1.3 Tolerances on shape 5.1.3.1 Straightness of edges The tolerance on the straightness of edges is 1 mm/m for length and width. The measurement method
16、is given in 6.2.4. 5.1.3.2 Squareness of edges The tolerance on the squareness of edges is a maximum of 2 mm/m. The measurement method is given in 6.2.5. 2) Other dimensions may be supplied by agreement between the purchaser and the manufacturer. -,-,- IS0 8335 : 1987 (EI 5.1.4 Dimensional stability
17、 Dimensional variations due to changes of the moisture content of the boards shall be indicated in the manufacturers literature. Measurements shall be made according to national standards. 5.2 Mechanical characteristics 5.2.1 Bending strength The bending strength as determined by the measurement met
18、hod in 6.4.2 shall be at least 9 N/mm? For boards intended for use under wet conditions, the bending strength determined after 24 h immersion in water shall be at least 5,5 N/mm2 (type test). 5.2.2 Modulus of elasticity The value as determined by the measurement method in 6.4.2 shall be at least 3 0
19、60 N/mm? 5.2.3 Static point loading If appropriate to the intended use, the structure containing the product shall be subject to static point load testing and comply with test methods and values which may be specified in the country of use. 5.2.4 Screw-holding power If required, the screw-holding po
20、wer shall be determined by the method specified in annex C. 5.3 Physical characteristics Where the unprotected board is intended for applications ex- posed to the weather or moisture (but not roofing), it shall comply with the requirements of the appropriate type tests in- cluded in this Internation
21、al Standard. For roofing applications, the products need to be suitably protected. 5.3.1 Density When tested in accordance with 6.3.2, the boards shall have a density of at least 1 000 kg/ma at a moisture content of 9 % by weight. 5.3.2 Moisture content On despatch from the manufacturers premises, t
22、he moisture content shall be within 6 % to 12 % measured according to 6.3.3. 5.3.3 Thickness swelling When tested in accordance with 6.3.4, the boards shall not swell by more than 2 %. 5.3.4 Dimensional variations The dimensional variations due to changes in the moisture con- tent of the boards shal
23、l be indicated in the manufacturers literature. Measurements shall be made according to national standards. 5.3.5 Frost resistance (type test) This requirement shall only apply in cases when the conditions of use or national standards justify it. Boards tested according to the method in 6.3.5 shall
24、not show visible cracking or surface alteration. This specification does not apply to surface coatings. 5.3.6 Fire resistance (type test) Due to the composition and dense structure, the boards possess fire resistance characteristics which shall be tested if required according to relevant standards o
25、r national regula- tions. 5.3.7 Impact resistance If appropriate to the intended use, the product or the structure containing the product shall be subject to impact testing and comply with test methods and values which may be specified in the country of use. 6 Test method 6.1 General test conditions
26、 Test specimens shall have the moisture content specified in 5.3.2. Should the moisture content be outside this range, the samples should be equilibrated to constant mass at a temperature of 23 f 5 “C and a relative humidity of (60 + IO) %. Constant mass is achieved when two successive weighings, ca
27、rried out at an interval of 24 h, do not differ by more than 0,5 %. 6.2 Geometrical controls 6.2.1 Equipment 6.2.1.1 Smooth, flat and rigid inspection surface, large enough to take the sheet. Two metal rules may be fixed at right angles along the edges of the inspection surface. The straightness of
28、each metal rule shall be at least 0,3 mm/m and the right angle shall be accurate to at least 0,l % (less than 1 mm deviation from normal per metre of length) or 0,001 rad. Alternatively, a portable square may be used. The same re- quirements for straightness and angularity apply. 6.2.1.2 Metal ruler
29、s of a suitable length, capable of being read to 0,5 mm. 6.2.1.3 Micrometer, reading at least to 065 mm with flat and circular metal jaws of at least IO mm in diameter. 6.2.2 Measurement of width and length Smooth any rough areas. Measure to the nearest 0,5 mm, using a metal rule, the length and wid
30、th at three places avoiding taking the measurement over a local deformation which could be considered as a visual defect. 2 IS0 8335 : 1987 (E) Compare the values obtained with the specifications in 5.1.2. 6.2.3 Measurement of thickness Measure to the nearest 0,5 mm, using a micrometer (6.2.1.31, th
31、e thickness at three places over the width of the board (see figure I). Compare the maximum difference in thickness with the tolerances given in 5.1.2. 6.2.4 Measurement of straightness of edges In succession, apply each side of the sheet to the relevant arm of the square. Measure to the nearest 0,5
32、 mm, by means of a steel rule, the maximum gap between the edge of the sheet and the arm of the square. Compare the values obtained with the speci- fication given in 5.1.3-l. 6.2.5 Measurement of out-of-squareness of sheet Place each of the four corners of the sheet in succession be- tween the arms
33、of the square, keeping the large side against the large arm and the small side in contact with the small arm. In this position, measure the distance of the apex of the corner from the small arm of the square. Compare this value with the tolerance given in 5.1.3.2. 6.3 Physical tests The physical cha
34、racteristics of a board shall be determined as the average result of five test specimens of that board. 6.3.1 Test specimens Five test specimens shall be cut to be representative of the board. The specimens for the compulsory physical test shall be square, with sides measuring 100 mm, weighed to an
35、accuracy of 0,l g. The thickness of each specimen shall be measured at four dif- ferent points, shown by the circles in figure 2 to the nearest 0,05 mm. The arithmetic mean of the four readings shall be taken as the thickness of the test specimen. The dimensions of the sides, parallel to the edges,
36、shall be measured to the nearest 0,l mm. The mean of each of the two pairs of parallel measurements shall be taken as the length and width of the test specimen. Dimensions in millimetres Figure 1 - Thickness measurement points 3 ISO8335:1987(E) Dimensions in millimetres Figure 2 - Specimen dimension
37、s for physical tests 6.3.2 Determination of apparent density The apparent density, Q, is calculated by the formula where m is the mass of the test piece, in grams; V Is the volume of the test piece, in cubic centimetres. Determine the volume by calculation from the values of the measurements in 6.3.
38、1, to the nearest 0,l ems. Compare each value obtained with the requirements of 5.3.1. 6.3.3 Determination of moisture content Determine the constant mass of each test piece cut in ac- cordance with 6.3.1 by drying in an oven at 100 to 105 “C, until the difference between two consecutive weighings a
39、fter an in- terval of 6 h is not more than 0,l %. After cooling in a dry atmosphere, weigh the sample with the same accuracy as before and rapidly enough to avoid an in- crease of moisture content of greater than 0,l %. Calculate the moisture content, H, as a percentage of each piece, to the nearest
40、 0,l % using the formula H= m0 - ml x 100 ml 4 where m. is the mass of the test piece at the time of sampling, in grams; ml is the mass of the dried test piece, in grams. The moisture content of a board shall be taken as the arithmetical mean of the moisture contents of all the relevant test pieces
41、and shall be stated to the nearest 0,l %. Compare each value obtained with the requirements of 5.3.2. 6.3.4 Determination of swelling in water Measure the thickness of the test piece as described in 6.3.1. Determine the thickness swelling by immersing each test specimen in clean water at ambient tem
42、perature. The specimens shall be placed vertically and be separated by at least 10 mm from each other and from the bottom and sides of the container. Cover them to an approximate depth of 25 mm of water. After 24 h, withdraw each specimen from the water and allow them to stand under normal room cond
43、itions for 2 h with the bottom edges on a non-absorbent surface. Then remeasure the thickness of each specimen at the same points as indicated in 6.3.1 and calculate the swelling value of the board after 24 h immersion in water, S,+ in grams to the nearest 0,l %, as follows : s, = - e2 - el x 1oo IS
44、0 8335 : 1987 (El where el is the mean thickness before water immersion; e2 is the mean thickness after water immersion. Compare the values obtained with the specification of 5.3.3. 6.3.5 Frost resistance (optional test) Test pieces shall be immersed in water at ambient temperature for 46 h. They sh
45、all then be submitted to alternate cycles of freezing and thawing between temperatures of - 20 OC and + 20 OC. The number and duration of the cycles shall be specified by the national standards. Check for visible cracking and surface alteration. 6.4 Mechanical tests 6.4.1 Test specimens The test pie
46、ces shall be cut from the same part of the board, as shown in figure 3. Five test pieces shall be taken in each direction. The width of each test specimen shall be 100 mm and the length 16e + 25 mm (to the nearest 25 mm), where e is the nominal thickness of the board in millimetres (see figure 3). T
47、he width of each test specimen shall be measured as specified in 6.3.1 to the nearest 1 mm. The thickness shall be measured as specified in 6.3.1 approximately 20 mm inside the midpoints of the two long edges, to an accuracy of + 065 mm. The mean of the two readings shall be calculated. NOTES 1 Test
48、 specimens used to determine modulus of elasticity may also be used to determine bending strength. 2 If it is not possible to take five specimens out of one length of the sheet, the fifth specimen can be taken as shown by the dotted line. 6.4.2 Test procedure 6.4.2.1 Equipment Each test specimen sha
49、ll be supported on parallel metal rollers having a radius of 10 to 30 mm and free to rotate in ball or roller bearings. The centre-to-centre distance between the rollers shall be If-9 to the nearest 25 mm. The span shall be measured to the nearest 1 mm. A load perpendicular to the face of the test piece shall then be applied at the centre of the span, by means of a metal bar of a radius of 10 to 30 mm, parallel to the supporting rollers and in contact with the test specimen over its whole width.