A concrete saw cutting a test section and a falling weight deflectometer rolling across the fresh cut is how our rigid pavement design work starts in Victoria. We don't rely on desktop assumptions for the Capital Region. The marine environment here, with salt-laden wind off the Strait of Juan de Fuca and winter wet-dry cycles, puts real stress on jointed plain concrete pavement. Our lab runs flexural strength beams, measures the modulus of rupture, and ties everything back to the specific aggregate sources available on Vancouver Island. Before we write a single thickness number, we confirm the subgrade support under Victoria's variable glacial till and marine clay deposits. That ground truth is what separates a pavement section that lasts 25 years from one that spalls after the first heavy rain. The plate load test gives us the modulus of subgrade reaction k-value right at formation level, not from a textbook table. For projects near the Inner Harbour or Esquimalt, where fill layers can hide soft pockets, we also run CPT testing to map the vertical profile and catch any low-strength lenses that would crack a rigid slab under repeated axle loads.
A rigid pavement slab is only as good as the k-value you design it on. We measure it, we don't assume it.
