The Benkelman beam and the heavy falling weight deflectometer are the tools we unload first on any rigid pavement job in Swindon. Not glamorous, but they tell you exactly how the ground will behave under repeated load. Swindon sits on a mix of Upper Jurassic limestone, Oxford Clay, and extensive made ground from the old railway works — it’s a layered puzzle. You can’t just pour a 200 mm concrete slab and hope for the best. We start with deflection testing and dynamic cone penetration to back-calculate the modulus of each layer, then run the numbers through Westergaard or finite element models. For logistics parks near the A419 or industrial units off Great Western Way, a plate load test gives us the modulus of subgrade reaction directly — no guesswork. And when the top 600 mm look suspicious, a quick test pit lets us log the fill and check for old brick rubble, clinker, or voids from Swindon's industrial past. The goal is always the same: a slab that won't curl, crack, or pump fines out of the joints after two wet winters.
A rigid pavement fails from the bottom up: if the subgrade pumps, the slab cracks. Swindon's Oxford Clay needs drainage and a stiff capping layer before any concrete goes down.
