Heavy Civil Outdoor Paving

Heavy-civil pavement is designed around repeated trucks, buses, public traffic, frost, structures, drainage, staged construction, and formal quality testing. It usually has a thicker engineered granular and asphalt or concrete section, stronger joint details, and more extensive subgrade work than a light commercial lot. Actual design follows traffic and geotechnical data.

Reconstruction is required where widespread base or subgrade movement, drainage failure, deep rutting, frost heave, utility-trench settlement, or repeated alligator cracking shows that support has failed. Milling and overlay suit stable pavement with surface deterioration. Cores, test pits, proof rolling, and drainage review guide the decision.

The contract defines density testing by cores, gauges, or approved methods and establishes acceptance criteria. Harrowgate also monitors mix and mat temperature, lift thickness, roller pattern, passes, joints, and visual segregation. Testing is performed across the mat and at difficult edges so weak confined areas are not ignored.

Subdrains remove water from granular layers and subgrade before it reduces bearing or contributes to frost movement. They require correct elevation, bedding, filter material, pipe, outlets, and maintenance access. A pipe with no positive outlet or one clogged by fines cannot protect the pavement structure.

Traffic release depends on mix, lift, mat temperature, ambient conditions, edge support, and whether multiple lifts or markings remain. Asphalt must cool enough to resist scuffing and shoving. Harrowgate stages light and heavy access separately and protects joints or unsupported edges from turning truck wheels.

OPSS materials and construction methods provide useful Ontario benchmarks, but the private contract, geotechnical design, owner criteria, and local approvals determine which clauses apply. Harrowgate identifies the governing specification in the work plan and does not claim municipal acceptance where the project has a different testing or performance requirement.

Provide civil and pavement drawings, geotechnical report, traffic data, OPSS or local specifications, removals, structure adjustments, drainage, utilities, testing, traffic staging, haul restrictions, schedule, and restoration. Harrowgate verifies quantities and proposes the equipment, lift, truck, roller, and phasing plan needed to build the complete section.