Concrete Repair and Restoration Ottawa

Step 1, diagnose before defining repair limits. Harrowgate checks cracking, delamination surveys, sounding, cores, chloride or carbonation data, leakage, reinforcement cover, structural drawings, drainage, movement, and prior repairs with the consultant as required.

Step 2, isolate and remove safely. Loads, traffic, services, falling debris, dust, silica, water, and temporary support are controlled. Sawcuts define edges and low-vibration tools remove unsound material without bruising the concrete that must remain.

Step 3, treat reinforcement and substrate. Bars are exposed around their circumference where specified, cleaned, measured, supplemented or replaced under the design, and protected if required. The substrate is roughened, cleaned, and brought to the moisture condition required by the repair material.

Step 4, place and cure the repair. Hand-applied mortar, formed concrete, grout, shotcrete, or injection is installed within manufacturer and specification limits. Lift thickness, consolidation, finishing, temperature, and curing are controlled to reduce shrinkage and debonding.

Step 5, verify and protect. Sounding, bond tests, cores, injection records, thickness checks, or visual acceptance follow the specification. Joints, membranes, coatings, drainage, and traffic protection are completed only after the repair reaches the required condition.

The work zone is isolated and any required shoring installed before removal. We mark engineer-defined boundaries, sawcut edges to a controlled depth, and remove unsound concrete by chipping, milling, scarifying, or hydrodemolition selected for member thickness, reinforcement, vibration limits, contamination, and required surface. Removal extends to sound material and around corroded bars as detailed, without feather edges or uncontrolled damage to retained concrete.

Exposed concrete is sounded and reinforcement inspected after cleaning. Bar diameter and section loss are compared with the repair criteria. Supplemental or replacement bars, couplers, dowels, and anchors are installed only to issued details. Corrosion products, laitance, oil, salts, dust, and weak paste are removed. The substrate receives the specified roughness and moisture condition, while formwork is sealed and vented for the selected hand patch, formed-and-pumped repair, shotcrete, overlay, or crack treatment.

Repair material is chosen for placement thickness, orientation, strength, modulus, shrinkage, permeability, thermal movement, exposure, and return-to-service time. Harrowgate batches and conditions proprietary materials within their limits, rejects expired or overheated product, and controls water addition. Concrete and mortar are consolidated against all prepared faces and behind bars. Overhead and vertical repairs are placed in lifts or through forms that prevent sag, rebound pockets, and trapped air.

Curing begins immediately and matches the material. Rapid-strength does not mean no cure. We protect repairs from vibration, freezing, evaporation, water, and loading until acceptance criteria are met. Crack injection, sealers, membranes, coatings, joint replacement, and drainage corrections follow only after substrate conditions are suitable. Closeout records identify repair limits, depth, bar work, material batches, tests, curing, and approved field changes.