What is ISO 22904 about?

ISO 22904 is an international standard on additions for concrete.

ISO 22904 specifies requirements for the properties for silica fume, siliceous fly ash and ground granulated blast furnace slag for use as a type II addition for the production of concrete.

NOTE: Fly ash produced with other types or higher percentages of co-combustion materials than those provided is not included in ISO 22904. Ground granulated blast-furnace slag containing any added materials other than grinding aids and/or gypsum (calcium sulphate) is not included in ISO 22904. ISO 22904 does not 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.

Who is ISO 22904 for?

ISO 22904 on additions for concrete is useful for:

Manufacturers and suppliers of concrete
Cement manufacturers

Why should you use ISO 22904?

Concrete is a structural material consisting of a hard, chemically inert particulate substance, known as aggregate, that is bonded together by cement and water.

ISO 22904 provides the chemical and physical properties of type II addition for the production of concrete that includes silica fume, fly ash and ground granulated blast furnace slag.

Regarding durability requirements, it is stated, in many applications, particularly in severe environmental conditions, the choice of cement has an influence on the durability of concrete, mortar and grouts e.g., freeze-thaw resistance and resistance to alkali-aggregate reactions.

ISO 22904 covers the test methods for determining the moisture content of ground granulated blast furnace slag, water requirement for category S fly ash and the content of soluble phosphate in fly ash which will help you in the manufacturing process of concrete.

These test methods are necessary for the guidance on conformity control and evaluation of conformity of concrete to ensure density, strength, durability, protection against corrosion and environment safety.

BS ISO 22904:2020

Additions for concrete

Current, Under Review

Published:

31 Jul 2020