BS-EN-771-5 pdf free download

BS-EN-771-5 pdf free download. Specification for masonry units — Part 5: Manufactured stone masonry units.
4 Materials 4.1 General The specifications of the materials to be used shall be included in the production control documentation. If appropriate European Standards are available, they shall be used except that aggregate need not comply with the grading requirements. If not available, the manufacturer shall specify the materials and have data on their suitability. 5 Requirements for manufactured stone masonry units 5.1 General The requirements and properties specified in this European Standard shall be defined in terms of the test methods and other procedures referred to in this European Standard. It should be noted that the standard test methods are not always applicable to specially shaped masonry units and accessory units as defined in 3.10 and 3.11 respectively. The conformity criteria given in the following sub-clauses relate to initial type testing (see 8.2) and when relevant to consignment testing (see annex A). For the compressive strength of Category I units use a 50 % fractile (p = 0,50) for mean values or 5 % fractile (p = 0,05) for characteristic values and a confidence level of 95 %. For production evaluation the manufacturer shall define the conformity criteria in the factory production control documentation (see 8.3). 5.2 Dimensions and tolerances 5.2.1 Dimensions The manufacturer shall declare the dimensions of the manufactured stone masonry units in millimetres for length, width and height, in that order (see Figure 1), and shall declare the tolerance category ! (see 5.2.2.1)”. 5.2.2.2 Flatness of bed faces When manufactured stone masonry units are intended to be used with thin layer mortar, the manufacturer shall declare the maximum deviation from flatness of the bed faces. If sampled in accordance with Clause A.2 and tested in accordance with EN 772-20, the deviation from flatness of the bed faces shall not exceed the declared value. 5.2.2.3 Parallelism of bed faces When manufactured stone masonry units are intended to be used with thin layer mortar, the manufacturer shall also declare the maximum deviation from plane parallelism of the bed faces. If sampled in accordance with Clause A.2 and tested in accordance with EN 772-16 Method d), the deviation from plane parallelism shall not exceed the declared value.” 5.3 !Configuration and appearance” 5.3.1 General Units may be homogenous or two-part but in the case of two-part masonry units the facing mix shall have a thickness of not less than 20 mm. There shall be no delamination between the facing and the backing concretes. !Text deleted” 5.3.2 !Configuration When relevant to the uses for which manufactured stone masonry units are put on the market, the configuration shall be declared, including the maximum area of voids on a bed face as a percentage of the length × width of the unit. The declaration may be made using a drawing or an illustration. Units intended for use in structural applications shall contain not more than 60 % by volume of all formed voids and may be provided with or without recesses or interlocking features. Such units containing not more than 25 % by volume of formed voids and having no single void greater than 12,5 % of the total volume of the unit may be declared as Group 1 masonry units, in accordance with the requirements of EN 1996-1-1.BS-EN-771-5 pdf download.