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130,000 tonnes of SHW Series 600 Class 1A Fill.
J Murphy & Son Ltd.
IBAA (Incinerator Bottom Ash Aggregate) Class 1A fill used to construct embankments for the grade separated intersection ramps. The embankment slopes were ~60 degrees in some places near the roundabout.
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.
The extraction of primary aggregates for construction and transport to construction sites places enormous pressure on the environment. Mineral mining accounts for 2.8% of the global greenhouse gas emissions. The use of manufactured aggregates from IBA prevents landfilling, mining of virgin raw materials and contributes to the circular economy.