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Incinerator Bottom Ash Recycling

Energy from waste facilities produce a bottom ash (IBA) that can be processed to make an aggregate suitable for construction projects and in the manufacture of asphalt.

Under contract to the EfW facilities, Day Group is experienced in the removal of IBA, as well as in the recycling and marketing of incinerator bottom ash aggregate (IBAA).

About IBAA

Incinerator bottom ash aggregate (IBAA) is a heterogeneous material which contains concrete, ceramics, glass, brick, clinker, some metals and fused material particles.

IBAA has been an accepted and widely used sustainable aggregate both in the UK and on the continent for many years. Over five million tonnes has been used as sub-base and capping material in numerous applications over that 10 year period.

It is a sustainable and cost effective option that complies with European and British Standards as well as sections of the Specification for Highway Works.


Day Aggregates IBAA is a manufactured aggregate compliant with various material designations from the Specification for Highway Works 600 and 800 series. It may also be used as a constituent of a granular material compliant to the same SHW 600 and 800 series. Manufactured aggregates must comply with the same requirements as primary materials. Given this, users and specifiers can choose a sustainable option such as IBAA, with the confidence that it will be fit for purpose and perform comparably with a primary material.


Day Aggregates IBAA may be used as a blend constituent in various aggregate mixtures. Mixtures can contain up to 20% IBAA as a blend constituent, this improves the grading of the overall mixture and aids with material compaction. Any mixtures should be regularly tested to demonstrate they are compliant with the relevant specification.


Unprocessed IBA is brought in to our purpose built plants in Brentford, Greenwich and Avonmouth using HGV tipper vehicles or by rail. The material is assessed on arrival against our site specific acceptance criteria and then stockpiled until it has suitably aged. Once this has occurred it will be ready for processing.

The process involves screening the material, separating the ferrous and non-ferrous metals for external recycling, re-screening, then further metal removal and then final product stockpiling. Dependant on the processing plant this results in two or three sizes of material being sent for stockpiling. These varying sized products are then blended together to produce an IBAA compliant to SHW Series 600.

If there is any doubt about which applications recycled or manufactured aggregates can be used in, please contact our Technical Department who will be happy to help you.

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