BS EN 771-3 pdf free download

BS EN 771-3 pdf free download. Specification for masonry units — Part 3: Aggregate concrete masonry units (dense and light-weight aggregates).
3 Definitions, terms and symbols 3.1 Terms and definitions For the purposes of this European Standard the following terms and definitions apply. 3.1.1 masonry unit preformed component intended for use in masonry construction 3.1.2 common masonry unit masonry unit normally intended for use with no faces left visible 3.1.3 facing masonry unit masonry unit intended for use with one or more faces left visible and which may or may not be exposed to external climatic conditions 3.1.4 exposed masonry unit facing masonry unit exposed to external climatic conditions without render or other equivalent protection 3.1.5 aggregate concrete masonry unit masonry unit manufactured from, cementitious binder, aggregates and water and which may contain admixtures and additions and colouring pigments and other materials incorporated or applied during or subsequent to unit manufacture 3.1.6 co-ordinating size size of a co-ordinating space allocated to a masonry unit including allowances for joints 3.1.7 work size size of a unit specified for its manufacture, to which the actual size conforms within permissible deviations 3.1.8 actual size size of a unit as measured 3.1.9 regular shaped masonry unit masonry unit with an overall rectangular parallelepiped shape NOTE Examples of different shapes of concrete masonry units are shown in Annex C. 3.1.10 specially shaped masonry unit masonry unit which is not a rectangular parallelepiped 3.1.11 accessory unit unit which is shaped to provide a particular function, e.g. to complete the geometry of the masonry 3.1.12 interlocking features shaped matched projections and indentations on masonry units, e.g. tongue and groove systems 3.1.13 hole formed void which may or may not pass completely through a masonry unit 3.1.14 frog depression formed in one or both of the bed faces of a unit, the total volume of all such depressions which does not exceed a certain limit of the overall volume of the unit, i.e. length × width × height 3.1.15 recess depression or indentation in one or more surfaces of a masonry unit (e.g. mortar pocket, rendering keyway, grooves to provide a discontinuity in the mortar joint, grip hole) 3.1.16 shell peripheral solid material between the hole(s) and the face or the header of a unit 3.1.23 characteristic compressive strength of masonry units compressive strength corresponding to a 5 % lower fractile of the compressive strength of masonry units 3.1.24 combined thickness of webs and shells sum of the thicknesses of the shells and webs from one face or header of a masonry unit to the opposite face or header respectively along whichever path, via the formed voids, gives the smallest value, expressed as a percentage of the unit width or length respectively 4 Materials 4.1 General The specifications of the materials to be used shall be included in the production control documentation (see 8.3). If appropriate European Standards are available, they shall be used except that aggregates need not comply with grading requirements. If not available, the manufacturer shall specify the materials and have data on their suitability. 5 Requirements for aggregate concrete 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. NOTE A declared value may be chosen from the classification system, if any, of the place of manufacture/use of the units. It should be noted that the standard test methods are not always applicable to specially shaped and accessory units as defined in 3.1.10 and 3.1.11.BS EN 771-3  pdf download.