DIN EN 451-2:2017-08

This European specifies the method for the determination of fly ash fineness by wet sieving on a 0,045 mm sieve (ISO 565). The European Standard specifies the reference procedure. If other methods are used it needs to be shown that they give results equivalent to those obtained by the reference method. In case of a dispute, only the reference method is used. This standard differs from DIN EN 451-2:1995-01 as follows: a) term and definition of "constant mass" have been included; b) requirements for the preparation of a sample have been included in Clause 7; c) information on repeatability and reproducibility has been included in Clause 11; d) the standard has been editorially revised. Working Committee NA 005-07-24 AA "Betonzusatzstoffe (SpA zu CEN/TC 104/WG 4, SpA zu CEN/TC 104/WG 9, SpA zu CEN/TC 104/WG 15)" ("Additions for concrete (national mirror committee of CEN/TC 104/WG 4, CEN/TC 104/WG 9, CEN/TC 104/WG 15)") at DIN Standards Committee Building and Civil Engineering (NABau) is responsible for the German collaboration.