ARDEX K 523™​​​​​​​​​​​​

Self-Leveling Concrete Topping with Aggregate Surface

  • Features a mix of black and white aggregate
  • Resurface indoor concrete
  • Polishable in as little as 24 hours


INFORMATION ARDEX K 523™​​​​​​​​​​​​

ARDEX K 523™ is a pourable, polishable, self-leveling topping for fast-track resurfacing of indoor concrete. ARDEX K 523 can be installed from a minimum thickness of 3/8″ (9 mm) up to a maximum thickness of 2″ (5 cm).  With black and white aggregates, ARDEX K 523 provides a polished, “aggregate-exposed” surface. Polishing can proceed in as little as 24 hours.

Key Features

  • A blend of Portland cement, hydraulic cements and specialty black and white aggregates
  • Resurface indoor concrete
  • Walk on in 2-3 hours, polish in as little as 24 hours
  • Use for interior floors only


Tested in accordance with ASTM C1708

TECHNICAL DATA ARDEX K 523™​​​​​​​​​​​​


Mixing Ratio: 3.25 or 3.75 quarts (3.07 or 3.55 L) of water per 50 lb. (22.7 kg) bag
Coverage: Up to 13 sq. ft. per bag at 3/8” (1.2 sq. m at 9 mm)


Flow time: 10 minutes
Compressive strength (ASTM C109/mod – air cure only): 6,200 psi (436 kg/sq. cm.) at 28 days
Flexural strength (ASTM C348): 1,100 psi (77 kg/sq. cm.) at 28 days
Walkable: 2 – 3 hours (without E 25); 24 hours (with E 25)
Polishable: 24 hours (without E 25); 48 hours (with E 25)
Available Colors: Gray
VOC: 0
Packaging: 50 lb. (22.7 kg) net weight bag
Storage: Store in a cool, dry area. Do not leave bags exposed to sun.
Shelf life: Nine months, if unopened
Warranty: ARDEX Americas Standard Limited Warranty applies.