All remnants of concrete, mortar, dust, grease, oil, etc., must be completely removed. Damaged or contaminated concrete should be removed to expose the aggregate surface. Utilize non-impact/vibrating cleaning methods like grit or high-pressure water blasting. The repair edges should be cut vertically to a depth of at least 5 mm. Ensure all exposed reinforcement is cleaned to a minimum SA 2 grade following ISO 8501-1 / ISO 2944-4 standards. Clear the back of the rebar from contaminants as well. If corrosion is detected on reinforcing bars, cut back the concrete by at least 20mm behind them. Use grit blasting to
remove corrosion products around the bars and then coat with PCConrend®ZRP to prevent further corrosion. If the diameter of the reinforcing bars is reduced by over 20% after grit blasting, consider replacing the affected section with guidance from the project’s structural engineer.

After completing the necessary preparation steps outlined above, the concrete surface is now ready for repair and restoration. When applying new concrete, make sure it is of high quality and compatible with the existing structure to ensure long-lasting results. Properly place and compact the fresh concrete to achieve a smooth and uniform finish.