CEN/TC 104/WG 4 - EN 450 fly ash for concrete

This European Standard 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 European Standard specifies the procedure for the determination of free calcium oxide content in fly ash.
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.

This Technical Report describes the backgrounds to the revision on EN 450-1:2005+A1:2007, Fly ash for concrete - Part 1: Definition, specifications and conformity criteria.

This European Standard specifies requirements for the chemical and physical properties as well as quality control procedures for siliceous fly ash, as defined in 3.2, for use as a type II addition for production of concrete conforming to EN 206-1. Fly ash according to this document may also be used in mortars and grouts.
Fly ash produced with other types or higher percentages of co-combustion materials than those provided for in Clause 4 is outside the scope of this European Standard.
It is beyond the scope of this European Standard to specify provisions governing the practical application of fly ash in the production of concrete, i.e. requirements concerning composition, mixing, placing, curing etc. of concrete containing fly ash. Regarding such provisions, reference should be made to other European or national standards for concrete, such as EN 206-1.

This document specifies the scheme for the evaluation of conformity of fly ash according to EN 450-1:2005.
The document provides technical rules for the production control by the producer, including autocontrol testing of samples. It also provides rules for actions to be followed in the event of non-conformity, the procedure for the certification of conformity and requirements for dispatching centres.
Guidance
EN 450-2 deals with the evaluation of conformity of fly ash submitted for certification. It deals in particular with cases where “further testing” of the product is undertaken, as is the case for attestation system 1 + under the Construction Products Directive. The product for which EN 450-2 applies is defined in
EN 450-1:2005 as fly ash for the production of concrete which consists of a fine powder of mainly spherical, glassy particles, derived from burning of pulverised coal, with or without co-combustion materials, which has pozzolanic properties.

This CEN report compiles the experience collected from the co-combustion of biomass and waste by 2002. The data and the test results are given from systematic research projects and from investigations on fly ash obtained from co-combustion in different power plants in the framework of national certification processes or from other co-combustion tests. The report:
-   includes the existing national regulations for the demonstration of the suitability of fly ash from co-combustion,
-   gives a survey on the combustion materials used so far,
-   describes the chemical composition of fly ashes obtained from co-combustion,
-   lists the chemical and physical properties of the fly ashes, which are relevant to the technical and environmental properties of concrete,
-   includes test results of properties of concrete with fly ashes obtained from co-combustion.

prEN 450-2 specifies the scheme for the evaluation of conformity of fly ash according to prEN 450-1, including certification of conformity by a certification body.
The standard provides technical rules for the production control by the manufacturer, including autocontrol testing of samples, and for the tasks of the certification body. It also provides rules for actions to be followed in the event of non-conformity, the procedure for the certification of conformity and requirements for dispatching centres.

This European Standard specifies the scheme for the evaluation of conformity of fly ash according to EN 450-1.

This European Standard describes the procedure for the determination of free calcium oxide content in fly ash.
The standard describes the reference procedure. If other methods are used it shall be shown that they give results equivalent to those obtained by the reference method.

This European Standard specifies requirements for the chemical and physical properties as well as quality control procedures for fly ash, as defined in clause 3.2, for use as a type II addition for preparation of concrete, mortar and grout, including in particular cast-in-situ or prefabricated structural concrete conforming to EN 206-1. )
It is, however, beyond the scope of this standard to specify provisions governing the practical application of fly ash in the production of concrete, i.e. requirements concerning composition, mixing, placing, curing etc. of concrete containing fly ash. As regards such provisions, reference should be made to other European or national standards for concrete, such as EN 206-1.
Fly ash for use in the manufacture of cements according to EN 197-1 is outside the scope of this standard.

This European Standard specifies requirements for the chemical and physical properties as well as quality control procedures for fly ash, as defined in clause 3.2, for use as a type II addition for preparation of concrete, mortar and grout, including in particular cast-in-situ or prefabricated structural concrete conforming to EN 206-1. )
It is, however, beyond the scope of this standard to specify provisions governing the practical application of fly ash in the production of concrete, i.e. requirements concerning composition, mixing, placing, curing etc. of concrete containing fly ash. As regards such provisions, reference should be made to other European or national standards for concrete, such as EN 206-1.
Fly ash for use in the manufacture of cements according to EN 197-1 is outside the scope of this standard.