1、STD-BSI BS EN 1353-ENGL 1997 m 1b2Lfbb Ob47021 183 BRITISH STANDARD Determination of moisture content of autoclaved aerated concrete The European Stan b) Cdiipers, capable of reading the dimensions of test specimens to an accuracy of 0,l mm; c) A balance, capable of determining the mass of test spec
2、imens to an accuracy of 0,1%, d) A ventilated drying oven, capable of maintaining a temperature of (105 f 5) “C. Page 3 EN 1353 : 1996 5 %st specimens 6.1 Sample The sample for the prepdon of the test specimens (i.e. normally at least one Prefabricated component) shall be taken in such a manner that
3、 it is represenaive of the product to be investigated. 6.2 Shape and size of test specimens The test specimens shall be prisms, cubes, or cylinders with a minimum dimension of at least 50 mm and a volume of at least 0,5 X 6.3 Number of test specimens A test set shall consist of at least three test s
4、pecimens. Whenever possible, one test specimen shall be prepared from the upper third of the component, one from the middle and one from the lower third, in the direction of rise of the mass during manufacture (see fim 1). The position of the test specimens in the material, relative to the rise of t
5、he mass, shall be shown by the numbering. Alternatively, one single test specimen is sufficient, if it extens over the full height of the rise of the mass and if its volume is at least 1,5 X m3. The moisture content determined on such a test Specimen is equivalent to the mean value of three individu
6、al test specimens according to 6.2. 6.4 Preparation of test specimens The test specimens shall be cut by means of a saw (or by means of a core drill in the case of cylindrical test specimens) taking care that the moisture content is influenced as little as possible (e.g. no water cooling of the saw
7、or core drill). Au surfaces shall be clean and plane enough to enable determination of the volume with sufficient accuracy (see 6.2). If the inclusion of reinforcement cannot be avoided, the mass and the volume of the reinforcement, including antixorrosion coating, shall be considered in the calcula
8、tion of the moisture content. NOTE. Preferably, test specimens should not contain any reinforcement. m3 each. ) A European Standard for prefabricated reinforced components of autoclaved aerated concrete is in preparation at CEN. O BSI 1997 STD-BSI BS EN 1353-ENGL 1797 I1b24bb9 b47028 538 I Page 4 EN
9、 1363 : 1996 Direction of rise - Zone 3 Zone 1 Zone 2 4- 1 w13 w13 w13 r - Width W e Figure 1. Sampling scheme 6 Testing procedure 6.1 Determination of the mass of test specimens ;n the moist state i. I mediately after the prepdon of the test specimens, before any loss of moisture has occurred, the
10、mass mh, of the individual test specimens in the moist state shall be determined to an accuracy of 0,196 6.2 Determination of the volume of test specimens The volume of the individual test specimens is cal- Mm their measured dimensions. The error in determining the volume V shal not exceed 1 % 6.3 D
11、rying of test specimens ARer these measurements, the test specimens shall be placed in a ventilated rying oven at (105 f 5) C until constant mass is attained. The dry mass mw of the individual test specimens shall be determined immeiately after removal from the drymg oven. The error in determining t
12、he mass shall not exceed 0,1%. The mass of the test specimen is considered constant if ar 24 h of further drying it has not changed by more than 0,2 3. 7 Llest results The moisture content, related to mass, is calculated according to equation (1): where pm mhm is the mass of the test specimen in the
13、 moist mw is the mass of the dried test specimen, in The moisture content, related to mass, pm, of each is the moisture content, related to mass, in per cent; -, in grams; grams. individual t mhm is the mass of the test specimen in the moist state, in grams; mw is the mass of the dried test specimen
14、, in grams; V is the volume of the test specimen, in cubic miimetres. The moisture content related to volume, ,uln of each individual test specimen and the mean value shail be expressed to the nearest 1 kghn3. 8 %st report The test report shall include the foliowing: a) identificaton of the product;
15、 b) date of manufacture or other code; c) place and date of testing, testing institute, and person responsible for testing d) number and date of issue of this European e) shape, size, and relative position of test specimens; f) moisture content ,um andlor pv of each individual test specimen and mean
16、 value; g) (if unusuai) observations on the appearance of test specimens; h) (if appropriate) deviations from the standard method of testing; j) a declaration that the testing has been carried out in accordance with this European Stanch except as detailed in Sh). Standard; O BSI 1997 STD-BSI BS EN 1
17、353-ENGL 1777 m lb24bb7 b47029 474 BS EN 1353 : 1997 BSI 389 Chiswick High Road London w4 4AL BSI - British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the intedonal level. It is incorpo
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