Repentigny’s expansion along the Assomption River floodplain, with its residential crescents pushing north onto the till plains of the Lanaudière region, has created a mosaic of subgrade conditions that few generalist labs appreciate. The silty sands of the older river terraces near Boulevard Brien behave differently under repeated wheel loads than the dense lodgement till encountered at three meters depth in newer developments near Rue Notre-Dame. Our laboratory CBR test program addresses this variability by controlling moisture, density, and surcharge weight precisely, producing penetration curves that civil engineers can trust when designing flexible pavements for collector roads or rigid pavement sections for heavy truck routes. For projects where the subgrade shows marginal bearing capacity, we often recommend complementing the soaked CBR evaluation with a CPT test to map the vertical extent of weak layers before finalizing the pavement structure, or reviewing the slope stability when the alignment cuts into the riverbank bluffs that characterize the southern edge of the city.
A soaked CBR value from a properly compacted specimen at the target moisture content is the single most reliable predictor of pavement rutting performance under Repentigny’s freeze-thaw cycles.
