Precautions for Grinding Hardened Concrete Floors

Grinding Sequence and Pad Selection: It is essential to strictly follow the grinding pad sequence from coarse to fine (e.g., 50 grit → 300 grit → 500 grit → 1000 grit). Skipping grits will result in deep scratches that cannot be removed.

In the coarse grinding stage, use diamond pads or low-grit pads (e.g., 100 grit) to treat the substrate. In the fine grinding stage, gradually switch to higher-grit pads (e.g., 800-3000 grit) for polishing.

Post-Grinding Cleaning: Thoroughly clean the floor of dust and slurry after each grinding session. Otherwise, residual particles will affect the penetration of subsequent materials or cause grinding marks.

It is recommended to use a vacuum cleaner or rinse with clean water to ensure the substrate is clean before proceeding to the next step.

Operating Techniques: The grinder should be used at a uniform speed with cross-grit grinding to avoid excessive wear in certain areas or uneven surfaces.

Use a handheld angle grinder to assist in the treatment of corner areas to ensure overall flatness.

Environmental and Material Control: The application temperature must be between 10-35℃; low temperatures will inhibit the hardener reaction.

The hardener must be diluted according to the specified ratio. After spraying, allow it to fully penetrate (approximately 2 hours), and promptly clean any surface residue to avoid white spots.

Common Problem Avoidance: If scratches appear on the surface, it must be re-gritmed at the next higher grit.

The concrete strength must be at least C25; a low-strength substrate will result in poor curing.

Following these steps effectively improves the quality of floor grinding, ensuring a hard, smooth, and high-gloss final finish.