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ARDEX Products

Toppings

ARDEX K 521™

ARDEX K 521™

Self-Leveling Concrete Topping with Aggregate Surface
Product Quantity 50 lbs
Colours Grey With Aggregate
Working Time 10 Minutes
Pot Life 10 Minutes
Dry Time 2-4 Hours Walkable | 24 Hours Polish
SF Or LF 15 SF | 9-10 SF
Area Or Depth 1/4" Thick
Floor Or Wall Floors
Interior or Exterior Interior
Compressive Strength (PSI) Day28 6800
TF Tack Free
RC Recoat
CG Concrete Guard
CD Concrete Dressing
FT Foot Traffic
LT Light Traffic
DT Dry Through
FC Full Cure
HFT Heavy Foot Traffic (Forklift)
VT Vehicular Traffic
FUT Full Traffic

  • ARDEX K 521™ is a pourable, polishable, self-leveling topping for fast-track resurfacing of indoor concrete. ARDEX K 521 can be installed from a minimum thickness of 3/8” (9 mm) up to a maximum thickness of 2” (5 cm). Use ARDEX K 521 to provide a polished, “aggregate-exposed” surface

  • Recommended Tools:ARDEX T-1 Mixing Paddle; ARDEX T-10 Mixing Drum; ARDEX T-4 Spreader; ARDEX T-5 smoother; ARDEX T-6 Spiked Roller; ARDEX MB-3.75 Measuring Bucket [3 3/4 quarts (3.55 L) per 50 lb. (22.7 kg) bag]; 1/2” (12 mm) heavy-duty drill (min. 650 rpm) and baseball or soccer shoes with non-metallic cleats

  • Priming: For all applications, prime with ARDEX EP 2000™ Substrate Preparation Epoxy Primer. Follow the general recommendations for substrate preparation above, and apply the ARDEX EP 2000 with sand broadcast, carefully following the instructions in the ARDEX EP 2000 technical data sheet

  • APPLICATION GUIDELINES: ARDEX K 521 has a flow time of 10 minutes at 70°F (21°C). Pour the mix onto the substrate and spread with the ARDEX T-4 Spreader. Immediately smooth the material with the ARDEX T-5 Smoother. If desired, use the ARDEX T-6 Spiked Roller to minimize smoother lines and reduce the need to fill aggregate voids. Wear baseball or soccer shoes with non-metallic cleats to avoid leaving marks in the liquid ARDEX K 521