Whats happened to BS3892 PFA and whats this BS EN450-1:2005?
BS3892 Part 1 (PFA for concrete) will be withdrawn as from 1 January 2007. After many years finally a ‘harmonised standard’ for PFA, or fly ash as it is commonly known in the rest of Europe has been agreed. This standard in BS EN450-1:2005. This standard permits a wide range of fly ash to be used in concrete. However, the finer material as required by the old BS3892 Part 1 will not disappear – but it will have a new name. It will be called EN450-1:2005 Category S fly ash. Think of the ‘S’ as meaning special ash. In addition there will be a Category N fly ash to EN450-1:2005 which will increasingly become available in the UK.
