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RS ISO 22904: 2020
Additions for concrete

Abstract

This document specifies requirements for the properties for silica fume, siliceous fly ash and ground
granulated blastfurnace slag for use as a type II addition for production of concrete conforming to
ISO 22965. Additions according to this document can also be used in mortars and grouts.
This document applies to the silica fume which is a by-product of the smelting process used to produce
silicon metal and ferro-silicon alloys.
Fly ash produced with other types or higher percentages of co-combustion materials than those
provided for in this document is outside the scope of this document.
Ground granulated blastfurnace slag containing any added materials other than grinding aids and/or
gypsum (calcium sulfate) is not within the scope of this document.
It is not within the scope of this document to specify provisions for the practical application of additions
in the production of concrete, mortar or grout, i.e. requirements concerning composition, mixing,
placing, curing, etc.
NOTE Some rules are given in ISO 22965-2, e.g. provisions on general suitability and use of additions.
Guidance on batching, control of additions content and the use of the k-value concept are also given in ISO 22965-2.

General Information

Code	Classification	Theme	Pages	Publisher	Availability
RS ISO 22904: 2020	ADOPTED ISO STANDARDS	Civil engineering	31	First Edition Apr 2025	Available