Technical information for a wide range of applications for ash  Please choose the application you are interested in from the menu bar below; Applications for PFA and FBA The applications for PFA and FBA are split into two distinct categories; 1. Bound - which are covered by the Quality Protocol and therefore can be treated as products rather as waste.  The covers use in Concrete, grouts, highway construction, and block making. 2. Unbound - which are embankment fill, horse menages and similar. A Quality Protocol is being worked on for the Unbound applications, though in the interim period a Regulatory Position paper covers these applications. See our environment and sustainability sections.