Adderstone Strata NE scheme: materials reuse and carbon lessons for engineers
Reviewed by Tom Sullivan
First reported on The Construction Index
30 Second Briefing
Adderstone Civils is reprocessing about 22,000m³ (circa 48,000t) of excavated stone into Type 1 sub-base for Strata’s first north-east housing scheme in Spennymoor, County Durham, covering adoptable roads, foul and surface water drainage, utilities and external works. The three‑year programme, which began in May 2026, uses an “intelligent” cut‑and‑fill balance so no virgin aggregate is imported and no arisings go to landfill. The materials strategy avoids an estimated 2,000 HGV movements and cuts embodied carbon by roughly 480t CO₂e.
Technical Brief
- Site-won stone is processed to a graded Type 1 sub-base specification for adoptable highways.
- Reprocessed material also supports foul and surface water drainage corridors and utility trench backfill.
- Cut-and-fill balance is managed to satisfy platform levels without off-site import or disposal.
- On-site processing reduces interface risk with local road network congestion and associated haulage safety exposure.
- Eliminating landfill arisings removes gate-fee costs and potential landfill tax exposure from the earthworks budget.
- Approach provides a replicable model for volume housebuilder infrastructure where underlying geology yields suitable stone.
Our Take
An embodied carbon reduction of 480 tonnes CO2e on a single UK infrastructure job is at the upper end of what is usually reported in our Infrastructure coverage, which suggests Strata’s north east debut could become a reference case when local authorities in the region tighten embodied-carbon requirements in procurement.
Given that many of the 917 Infrastructure stories centre on urban or trunk-road schemes, a Spennymoor-based project using recycled aggregate positions the north east as a test bed for circular-materials specifications that could later be standardised across other UK regions.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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