Why is surface preparation important for concrete repair?

Surface preparation is the single most important factor in the longevity of a repair. If the substrate is dirty, smooth, or friable, the new repair mortar will not bond. We use techniques like grit blasting, high-pressure water jetting, or needle gunning to achieve the correct Concrete Surface Profile (CSP). This creates a rough 'key' for the mechanical bond. We also ensure the substrate is 'Saturated Surface Dry' (SSD) before application to prevent the old concrete from sucking moisture out of the new repair material.