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Case study

Truro Eastern District Recycling Centre, Cornwall

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April 2020


Structural platform for recycling centre with access roads and car park. 

Material Specification
3,750 tonnes of SHW Series 600 Class 1A Fill and 5,000 tonnes of SHW Clause 803 Type 1 Subbase.

Suez Recycling and Recovery UK Limited.

Delivery Partner
Dawnus Construction Ltd.


IBAA (Incinerator Bottom Ash Aggregate) Class 1A fill was used to create a structural platform. IBAA Type 1 subbase was used underneath the surface materials of concrete and asphalt. Due to the large amounts of IBAA Class 1A fill, the IBAA Type 1 subbase only required placing at a depth of 150mm. Concrete and asphalt surfacing was laid at 250mm thickness over the IBAA Type 1 subbase.


IBAA is an extremely cost-effective material when compared to Primary Aggregates and BP UK is working towards a verified Carbon Footprint. There are also advantages logistically when using IBAA due to the low density of the material allowing for fewer vehicle movements as this gives volumetric advantages over primary materials.