A vibratory roller compactor moves across the hot asphalt mat on Rue Notre-Dame, its drum pressing aggregate into a dense, interlocking skeleton. That compaction pattern is the last physical step in a flexible pavement design sequence that starts months earlier in a materials lab. In Repentigny, where the Assomption River shapes local geography and winter temperatures drop below -20°C, the pavement structure must absorb traffic flexural strain without cracking during frost heave cycles. We calculate layer coefficients for asphalt concrete, granular base, and subbase using soil parameters extracted from borings across the MRC de L'Assomption. The goal is straightforward: enough structural number to carry projected ESALs over a 20-year design life, without overbuilding. Our team handles the full pavement thickness design package, from subgrade resilient modulus testing to final asphalt mix verification. The process ties directly into site investigation data — before we specify any lift thickness, we confirm what's underneath with test pits that expose the clay-silt transition common in Repentigny's low-lying sectors.
A pavement section is only as strong as its weakest spring thaw. We design for the March melt, not just the September traffic count.
