BS EN 933-2:2020 pdf free.Tests for geometrical properties of aggregates Determination of particle size distribution一Test sieves, nominal size of apertures .
BS EN 933-2 1 Scope. This document specifies the nominal size of apertures for test sieves used for determination of particle size of aggregates.It applies to: a) test sieves of perforated metal plate having square holes of size from 4 mm and up to 125 mm; b] test sieves of metal wire cloth having aperture sizes below 4 mm down to 0,063 mm. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 3310-1, Test sieves – Technical requirements and testing – Part 1: Test sieves of metal wire cloth ISO 3310-2, Test sieves – Technical requirements and testing – Part 2: Test sieves of perforated metal plate.3.1 metal wire cloth cloth of metal wires which cross each other to form square apertures of uniform size 3.2 perforated metal plate metal plate with square holes of uniform size in a regular arrangement 4 Requirements for applicable test sieves Test sieves with nominal aperture size of 4 mm and above shall have a perforated plate with square holes conforming to ISO 3310-2. Test sieves with nominal aperture size below 4 mm shall have a metal wire cloth with apertures conforming to ISO 3310-1. NOTE Test sieves of perforated metal plate with nominal aperture size of 4 mm and above have better sieving accuracy than test sieves of metal wire cloth with the same nominal size of apertures, due to tighter manufacturing tolerances. 5 Nominal size of apertures for applicable test sieves Nominal size of apertures for applicable test sieves are specified in Table 1. They are taken from the series R 20 in ISO 565:1990.BS EN 933-2 pdf download.