A recent infrastructure upgrade along 152 Street in Surrey revealed a common challenge: the native silty clays from the Semiahmoo and Fort Langley formations showed inconsistent stiffness. The project engineer needed reliable soaked CBR values before finalizing the structural pavement section. This is exactly the scenario where our laboratory CBR service becomes essential. By compacting remolded samples at target moisture and density—typically 95% of Modified Proctor per BC Ministry of Transportation specs—we simulate 96 hours of saturation to replicate worst-case field conditions. The load-penetration curve then reveals whether the subgrade can support design traffic without excessive thickness. Our Surrey-based team processes disturbed samples from across the Fraser Valley, from the upland tills of South Surrey to the compressible lowlands near Bridgeview, ensuring the pavement design accounts for real moisture sensitivity rather than optimistic dry assumptions. We complement the lab data with field density verification using the sand cone method when contractor compaction needs independent validation.
A soaked CBR of 3% versus 8% can mean the difference between 200 mm and 350 mm of asphalt on a Surrey collector road—moisture sensitivity drives the entire structural design.
