BS 408:2006 pdf download – Timber structures — Structural timber and glued laminated timber — Determination of some physical and mechanical properties 5 Determination of dimensions of test pieces The dimensions of the test piece shall be measured to an accuracy of 1 %. All measurements shall be made when the test pieces are conditioned as specified in clause 8. If the width or thickness varies within a test piece, these dimensions should be recorded as the average of three separate measurements taken at different positions on the length of each piece. The measurements shall not be taken closer than 1 50 mm to the ends. Specimens for perpendicular to grain tests shall be planed. 6 Determination of moisture content of test pieces The moisture content of the test piece shall be determined in accordance with EN 1 31 83-1 on a section taken from the test piece. For structural timber the section shall be of full cross section, free from knots and resin pockets. For perpendicular to grain test specimens the moisture content shall be determined from the whole specimen. In strength tests for bending and tension parallel to grain and compression parallel to grain, the section shall be cut as close as possible to the fracture. 7 Determination of density of test pieces The density of the whole cross section of the test piece shall be determined on a section taken from the test piece. For structural timber the section shall be of full cross section, free from knots and resin pockets. In strength tests, the section shall be cut as close as possible to the fracture. For perpendicular to grain test specimens the density of the test pieces shall be determined prior to test after conditioning from the measurements of mass and volume of the whole test piece. 8 Conditioning of test pieces The tests shall be carried out on pieces which are conditioned at the standard environment of (20 ± 2) o C and (65 ± 5) % relative humidity. A test piece is conditioned when it attains constant mass. Constant mass is considered to be attained when the results of two successive weighings, carried out at an interval of 6 h, do not differ by more than 0,1 % of the mass of the test piece. Where the timber to be tested is not readily conditionable to the above standard environment (e.g. for hardwoodswith high...

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