The Benkelman beam arcs across a test section in Brampton’s Castlemore area, its dial gauge recording deflections under an 80 kN axle load. A technician notes the rebound while a drill rig extracts Shelby tubes from the silty clay beneath the granular base. Flexible pavement design in Brampton relies on this measured subgrade response—not on textbook assumptions. The city’s population of roughly 700,000 generates traffic loads that demand a mechanistic-empirical approach, layering hot-mix asphalt over granular base and subbase courses calibrated to local CBR values. Climate adds another constraint: Brampton averages 120 freeze-thaw cycles annually, making frost-susceptibility testing a required step before finalizing any flexible pavement cross-section. Without site-specific modulus data, rutting appears within the first two winters.
A flexible pavement is only as strong as the subgrade it rests on—Brampton’s clay demands CBR testing at formation level before any aggregate hits the grade.
