1.Surface treatment
• All surfaces should be firm, clean, free of empty drums, oil, wax and release agent and other loose objects, painted surfaces should be rough balls, exposing at least 80% of the original surface, after the concrete surface is finished, it shall be cured for at least 28 days before it can be paved with bricks
• New plastered surfaces should be cured for at least 7 days before being paved with brick. Old concrete and plastered surfaces can be cleaned with industrial detergents or oil stains and then rinsed with a high-pressure faucet.
• The surface should be sun-dried for 24 hours before bricklaying
• Remove residue from concrete surfaces, especially from slant concrete slabs