-
- Exhibitor List
The UK Quality Ash Association (UKQAA) is a trade association representing the producers and users of UK coal fired power station ash products. Ash is an inevitable consequence of burning coal as it results from soil and minerals laid down with the coal many thousands of years ago. In UK coal fired power stations there are two main types of ash produced - Furnace Bottom Ash (FBA) and Pulverised Fuel Ash (PFA) also known as fly ash in some applications and many countries. We promote our members interests of an environmental, scientific, technical, and educational nature associated with all applications. This is achieved by sponsoring research, promoting the range of applications for ash products, representation on standardisation committees (both National and European), project steering committees, exhibiting at various events and presenting lunchtime seminars, etc. Much of our time over recent years has been spent working closely with WRAP and the Environment Agency helping to produce a Quality Protocol for PFA.
Fly Ash in Concrete
In this application PFA is traditionally known as fly ash. Fly Ash is a pozzolana - this means it reacts with lime to form silicate hydrates. These hydrates give concrete its enhanced strength and durability and it is supplied to the standard EN450-1:2005. The use of classified fly ash (dry fly ash, processed to remove the coarser particles) reduces the water content of concrete therefore reducing permeability. It improves the sulfate resistance and reduces the risk of Alkali Silica Reaction (ASR). Fly ash reduces the heat of hydration compared to Portland Cement and also produces highly workable concrete that easily flows around reinforcement, such as in self compacting concrete. Lightweight concrete permits smaller bases to be used in construction due to reduced load.
FBA in Lightweight Aggregate Concrete Blocks (LWA) and PFA in Autoclaved Aerated Concrete Blocks (AAC)
By using FBA and PFA in LWA blocks you gain several benefits, one being the sustainable conversion of by products into a cost effective building material. Another is the production of blocks with a wide range of properties and a flexible range of applications at a weight which is safe to handle manually. AAC blocks have high levels of thermal insulation, a high strength/weight ratio and the ability to meet acoustic and fire insulation requirements. The blocks, which conform to UK standards, contribute overall to cost savings arising from a number of secondary savings. From their use, lighter foundations and structural frames result and this along with the need for less insulation go towards producing real benefits. They are easily cut, worked and laid, with minimum maintenance and low handling costs.
PFA in Road Construction and Maintenance
Fly Ash Bound Mixtures (FABMs) - Holdiford Road at Tixall, close to Stafford, is a narrow rural road with field and property accesses and canal and river bridges. It is a canal bridge conservation area, which also falls within the Cannock Chase area of outstanding natural beauty. The road required repair consisting of structural ‘edge-of-carriageway’ reconstruction utilising FABM. Normally used for full width new or reconstruction work, this use of FABM highlights the versatility of the slow setting, slow hardening mixture and its suitability for haunch repairs and other narrow works such as trench reinstatement.
PFA as Structural Fill Material - Celtic Manor Ryder Cup 2010
In excess of 200,000 tonnes of PFA was used as a fill material at the Celtic Manor golf course, host of the 2010 Ryder Cup. In preparation for this event PFA was used to raise and level off areas of the course on which to build the television compound, a driving range and the practice area. A textile capillary break was employed to prevent saturation of the ash from sub-surface water. The ash was then covered in top soil to the final levels.
lead sponsor
lead supporters
chosen charity
