Challenge
Voids beneath the A83 carriageway caused localised instability and safety concerns, requiring rapid ground stabilisation on a key strategic route without prolonged closures or disruptive reconstruction.
Solution
Geobear delivered precision geopolymer injection to fill voids, re‑compact underlying soils and restore pavement support, enabling rapid return to service within controlled traffic management.
Critical A83 transport corridor
Localised sub‑surface treatment
Rapid curing after injection
The A83 is a strategically important route serving communities and freight traffic in western Scotland. Localised voiding had developed beneath sections of the carriageway, leading to loss of support and potential pavement instability.
Such defects are commonly associated with water ingress and progressive washout of sub‑base materials. Without intervention, continued trafficking could have resulted in further deterioration, increased maintenance demand and potential safety risks.
Given the A83’s role as a key regional connection, extended closures or full-depth reconstruction would have caused significant disruption to road users and local communities.
A solution was required that could stabilise the affected ground quickly, address voiding at depth and maintain carriageway availability within restricted traffic management windows.
Geobear implemented a controlled geopolymer injection programme to fill identified voids and reinstate support beneath the carriageway. Small‑diameter injection points were drilled through the pavement at predetermined locations.
The two‑component geopolymer was injected beneath the surface where it expanded to fill voids, bind loose material and increase bearing capacity. Real‑time monitoring ensured controlled expansion and movement remained within acceptable tolerances.
The rapid curing characteristics of the geopolymer enabled treated areas to be reopened to traffic shortly after completion, supporting efficient programme delivery and minimising user impact.
The intervention reinstated sub‑surface support and mitigated the risk of further instability without the need for excavation.
By delivering the works within controlled traffic management windows, disruption to road users was limited while achieving a technically robust and durable stabilisation outcome aligned with long‑term asset management objectives.
Get in touch with our expert team today and discover how Geobear can extend the life of your critical infrastructure assets.
