Blackpool sits barely six metres above sea level for most of its urban core. That figure alone should make every civil engineer pause before specifying a concrete pavement near the promenade. With a resident population of roughly 141,000 swelling to millions of visitors each summer, the promenade and its feeder roads take punishment most UK seaside towns never see. We approach rigid pavement design here as a layered problem: subgrade, subbase, slab, and—crucially—water. A standard catalogue cross-section copied from an inland scheme will fail early. Our team runs the ground investigation first, then builds the joint layout and thickness design around actual CBR values, not assumed ones. For schemes where the subbase sits on soft alluvium, we often pair the pavement scope with a deep excavation monitoring programme if adjacent structures are sensitive to settlement.
A concrete slab is only as good as the ground it floats on. On Blackpool's coastal sands, that means proving the subgrade before you pour a single cubic metre.
Our approach and scope
Local geotechnical context
We still see contractors in Blackpool placing concrete pavement directly onto a Type 1 subbase without a single plate-bearing test. On a dry day it looks fine. Two winters later the slab corners are curling, the transverse joints have lost aggregate interlock, and water is pumping fines out of the formation. At that point the repair bill is five times what the ground investigation would have cost. The biggest risk is differential frost heave where the subgrade transitions from free-draining sand to moisture-retentive clay over a short distance. Without a rigid pavement design that maps those transitions and adjusts slab thickness or subbase depth accordingly, the pavement will develop step faults that make it unsafe for the trams and the Illuminations crowds. Blackpool Council now requires a geotechnical interpretative report alongside the pavement design submission for any Section 278 agreement, and that is a standard we fully support.
Applicable standards
BS EN 1997-1:2004 + A1:2013 — Geotechnical design, DMRB CD 237 — Rigid pavement design for highways, BS 8500-1:2015 + A2:2019 — Concrete specification (XC4/XS1 exposure), HD 26/06 — Pavement construction and maintenance, BS 5930:2015 — Code of practice for ground investigations
Complementary services
Subgrade assessment and CBR verification
We log trial pits and run dynamic cone penetrometer profiles along the alignment to map CBR variability before the design thickness calculation begins.
Joint layout and load-transfer design
We size dowel bars, determine contraction joint spacing, and model curling stresses using Westergaard-based methods calibrated to local temperature ranges.
Construction-phase FWD testing
Post-construction we run falling-weight deflectometer surveys to confirm load transfer efficiency at joints and subgrade support uniformity before the road opens to traffic.
Typical parameters
Frequently asked questions
How much does a rigid pavement design package cost for a Blackpool project?
For a typical commercial access road or small highway scheme in Blackpool, the full package—ground investigation, CBR testing, pavement thickness design, joint detailing, and FWD verification—runs between £1,600 and £5,020. The spread depends on alignment length, number of trial pits, and whether we need to include stabilisation design for poor subgrade.
Why is rigid pavement preferred over flexible pavement on Blackpool's seafront?
Concrete slabs resist the constant moisture and salt spray far better than bituminous layers, which tend to strip and rut under heavy bus and tram loads. The rigidity also bridges localised soft spots in the made ground that would cause flexible pavements to deform within a few seasons.
Do you handle the Section 278 submission for Blackpool Council?
Yes. We prepare the geotechnical interpretative report and the rigid pavement design in the format Blackpool Council highways expects, including the required ground investigation logs, CBR data, and joint layout drawings. We also attend technical approval meetings if the council requests it.