Frequently ask questions... Many of questions asked of the UKQAA are similar, the following are those with answers. Click on the question to see the answer. If you have a question then please contact us and we will answer it as soon as possible. 1.     What is Pulverised Fuel Ash and Furnace Bottom Ash?  2.     What is fly ash? 3.     What does the word Pulverised mean in PFA?  4.     What's happened to BS3892 PFA and what's this BS EN450-1?  5.     How much does PFA or FBA cost? 6.     There are few coal fired power stations left. Is there enough PFA available?  7.     There are few coal fired power stations left. Is there enough FBA available?  8.     How much PFA can I put into a concrete mix?  9.     What is the 'drainage blanket' for beneath PFA when used as a fill material?  10.     What is the steepest slope that can be created using PFA as a fill material?  11.     What is the environmental impact of using PFA as a fill material?  12.     What is the environmental impact of using PFA in concrete?  13.     What is the environmental impact of using PFA grouts?  14.     Is there much sulfate in PFA? What class of sulfates for the concrete in foundations is required?  15.     Can PFA attack some metals?  16.     I want to import PFA (Fly ash) into my country, who should I contact?  17.     I / my company would be interested in becoming a member of the UKQAA?  18.     How much PFA and FBA are produced in the UK?  19.     Does the chromium VI directive on cement effect PFA?  20.     REACH - how will this affect the industry?  21.     Can I use PFA and/or FBA in Foamed Concrete without any risk of an explosion?  22.     Your question could be here - contact us with one...