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ARDEX A 23 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 six 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. It 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.


  • Rapid hardening – walkable after five hours.
  • Install ceramic tiles after 48 hours and natural stone after 72 hours.
  • Install resilient and wood floor finishes after six days.
  • Apply as a bonded, unbonded or floating screed.
  • Can be used with underfloor heating systems.
  • Can be pumped for fast application.

Related literature

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Standard product features

Compressive strength (using 0–8 mm graded aggregate):

  • After 7 days: 21 N/mm².
  • After 28 days: 30 N/mm².



ARDEX A 38 should be applied at the following thicknesses for normal cement/ sand screeds:

  • Minimum 20 mm (design thickness up to 40 mm) for bonded screeds.
  • Minimum 50 mm for unbonded screeds.
  • Minimum 75 mm for floating screeds (65 mm in lightly loaded (domestic) locations).

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-55-10/345 Cementitious levelling screed mix

Product specification

An important note about specifying





+44 (0)1440 714939

Product reference

ARDEX A 23 Fast Track Cement for Screeds

Manufacturer details

Homefield Road,
Suffolk, CB9 8QP
Tel +44 (0)1440 714939
Fax +44 (0)1440 716667
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