Ardex A23 – Rapid Hardening Cement
Ardex A23 – Rapid Hardening Cement is a special cement for producing a rapid hardening floor screed for internal use which allows ceramic tiles to be fixed after 48 hours, natural stone after 72 hours, and resilient floor coverings after 6 days.
Ardex A 23 is used to produce bonded, unbonded and floating screeds in internal locations where early foot traffic is required and where rapid drying is essential, e.g. to allow ceramic/porcelain tiles to be laid after 48 hours. A 1:7 mix is suitable for most normal screeding situations. Ardex A 23 can be installed on ground supported concrete slabs if an effective damp proof membrane is present. Ardex A 23 is not suitable as a wearing surface.
The working time of the mixed mortar is approximately 45 minutes at 20°C, therefore mixing, placing,
compaction and trowelling off must proceed without delay. The amount of mortar mixed and the area to be screeded should be limited so that trowelling off and finishing can be completed within the working time. Where a new bay is laid against a set and hardened screed it is recommended that such daywork joints are vertical and treated with the grouting slurry and may be tied together with steel reinforcement.
Apply Ardex A 23 cement and sand mortar at temperatures at 5°C and rising.
Application on a floor heating system:
When an Ardex A 23 screed has been laid on a hot water floor system, 6 days should be allowed to elapse before heating up the screed to a temperature of 25°C and maintained for a further 3 days. The maximum floor temperature should then be used and maintained for a further 4 days. In doing so draughts must be avoided. The floor should then be allowed to cool down to room temperature (above 15°C) before laying floor coverings.
All information on surface preparation, priming, mixing, water content and surface finishes can be found on the technical datasheet.
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