Over near Langley, we see a lot of pavements that fail early because the subgrade was never really understood. Hampton sits on the Coastal Plain, and the soils here run from silty sands to fat clays that swell with every rain. That matters when you're designing a flexible pavement section. The asphalt thickness, the base course, and the drainage layer all depend on what's underneath. We run the lab tests that feed directly into the AASHTO 93 design equation, so your structural number isn't just a guess. Before we even touch the pavement design, we often pair it with a CBR road survey to map out the support values across the site, and we use grain size analysis to confirm how the base aggregate will drain during a coastal storm. The city's flat topography doesn't mean the soil is uniform. We've logged profiles where the bearing capacity changes completely within 40 feet. Getting the pavement right means getting the subgrade right first.
An accurate resilient modulus test on the subgrade saves more asphalt dollars than any value-engineering exercise ever could.
