Concrete Parking Lots

Thickness depends on passenger, delivery, fire-truck, bus, waste-truck, and tractor-trailer traffic, plus subgrade support, drainage, joint spacing, and concrete properties. Passenger areas are often thinner than truck routes. Harrowgate follows the engineered pavement design and builds separate heavy-duty zones where vehicle tracking shows higher loads.

Exterior slabs exposed to freezing and de-icing salts are commonly specified as CSA Class C-2, often 32 MPa with a maximum 0.45 water-to-cementing-material ratio and properly selected air content. The approved project mix and municipal requirements control. Harrowgate verifies the designation, delivery ticket, and specified field tests.

Dowels transfer wheel load across a joint while allowing adjacent slabs to open and close. They reduce differential deflection, pumping, faulting, and corner stress. Harrowgate installs baskets level, parallel, centred on the joint, and secured against movement. Misaligned dowels can lock the joint and create cracking.

Drainage starts with coordinated design elevations at buildings, curbs, catchbasins, islands, and road tie-ins. Harrowgate fine-grades the base, controls forms and screed elevations, checks surface profile during finishing, and surveys critical low points. Utility adjustments and construction joints are integrated so they do not become unintended dams.

Opening depends on achieved concrete strength, pavement design, vehicle class, temperature history, curing, and the owner's criteria. Harrowgate coordinates test results, keeps barriers in place, and releases passenger or construction traffic only for approved areas. Heavy trucks can require a later opening than light vehicles.

Yes. Harrowgate sequences temporary entrances, fire routes, accessible paths, truck circulation, deliveries, concrete access, curing zones, and tie-in joints. Each phase needs stable drainage and protected edges. The plan avoids forcing traffic over young pavement or leaving an operating property without the routes required for emergency and daily use.

Scaling is promoted by excess surface water, finishing over bleed water, inadequate air entrainment, weak paste, poor curing, freezing at low early strength, and de-icing chemicals applied too soon. Harrowgate controls mix acceptance, finish timing, curing coverage, weather protection, and opening instructions to preserve the specified exterior surface.