Preparation of the concrete base

 

NEW CONCRETE
- compression strength min. 20 N/mm2 (B200, C16)
- 28 days after casting
- clean, dry surface
- no cement paste is allowed on the top of surface
- apply vacuum-cleaner if necessary
REQUIREMENTS AND PREPARATION OF OLD CONCRETE BASE

- compression strength min. 20 N/mm2 , clean, dry surface
How to make clean surface?

Only mechanical method could be effective!
1. If the surface is not deeply soiled (1-2 mm in thickness) remove it with grinder
2. If the surface deeply soiled (more than 2 mm) apply milling cutter.

 

Előkészítés
old, deeply soiled concrete surface preparation with milling cutter