This European Standard specifies requirements for the properties of fly ash for use as a type II addition in cast-in-situ or prefabricated structual concrete conforming to ENV 206. Fly ash for in use in the manufacture of cements according to ENV 197-1 is outside the scope of this standard. 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 are not part of this standard. As regards such provisions, reference is made to ENV 206 or national standards for concrete.