ARDEX K 301 Exterior Self-Smoothing Levelling and Resurfacing Compound

ARDEX K 301 is a high-performance, fast-setting, cement-based levelling and resurfacing compound designed to smooth and restore rough or damaged concrete surfaces. Ideal for both internal and external applications, this versatile product delivers a durable, flowable mortar that creates a flat, smooth finish for a variety of concrete surfaces, including driveways, patios, walkways, balconies, and garage floors. Its rapid hardening properties make it an excellent choice for projects requiring quick turnaround times without compromising strength or qualit

Key Features

• Fast-Setting Formula: Sets within approximately 1-2 hours and is walkable in just 2-3 hours at 20°C (68°F), minimizing downtime.
• Rapid Hardening: Ready to support light rubber-wheeled vehicular traffic after 48 hours, ensuring durability for demanding environments.
• Flexible Application Thickness: Can be applied from 2mm to 20mm in a single layer, accommodating a range of surface irregularities.
• Self-Smoothing: Produces a fluid mortar that flows easily, reducing the need for extensive troweling and ensuring a consistent finish.
• Internal and External Use: Suitable for a variety of environments, including permanently wet areas like swimming pools, where it can be tiled directly.
• Pumpable: Simplifies large-scale applications, making it efficient for projects like parking areas, courtyards, and commercial floors.
• Crack-Resistant: Engineered to minimize cracking, providing a stable base for further finishes or coatings.
• Compatible with Coatings: Can be sealed, painted, or coated with suitable resin-based systems, such as ARDEX WPM 200, for enhanced protection.

Surface Preparation

For optimal results, surfaces must be properly prepared:

• Concrete should be mature (at least 6 weeks old), hard, sound, and free of oil, grease, curing compounds, or other contaminants.
• Substrate can be dry or damp but not wet.
• Cracks should be repaired using a suitable crack repair system, such as ARDEX P10 SR, to prevent telegraphing.
• Movement joints must be carried through to the surface to prevent cracking
• Priming is required: Internal Dry Areas: Use ARDEX P51 Primer diluted 1:1 with water for absorbent surfaces or 1:0.5 for non-absorbent surfaces. External or Damp Areas: Dilute ARDEX P51 Primer 1:7 with water. Remove excess primer to avoid incorporation into the mortar.

Application Guidelines

• Mix ARDEX K 301 with clean water (5 liters per 25kg bag) to achieve a lump-free, fluid consistency.
• Pour the mixed mortar onto the primed surface within its 30-minute working time.
• Spread using a steel trowel, float, or gauging tool for larger areas. The mortar will self-smooth within the first 10 minutes.
• For a non-slip finish, reduce water content slightly and apply a broom finish after initial set (~40 minutes).
• Protect the fresh surface from rapid drying, direct sunlight, frost, or strong drafts until fully hardened.
• For multi-layer applications, sand the first layer (16-36 grit), clean, prime, and allow it to fully harden before applying the next.

Limitations

• Not suitable for heavy-duty industrial floors, public highways, or surfaces subject to metal or solid-wheeled traffic.
• Avoid use on asphalt, tarmacadam, or frost-damaged concrete prone to deflection.
• Not recommended for areas with intensive abrasive use in wet conditions.
• Apply at temperatures above 5°C (41°F).

Why Choose ARDEX K 301?

ARDEX K 301 combines speed, versatility, and durability, making it a trusted solution for contractors, builders, and homeowners. Its ability to deliver a smooth, hard-wearing surface in just hours sets it apart for time-sensitive projects, while its compatibility with wet environments and various finishes ensures long-lasting performance. Whether you’re resurfacing a weathered driveway or preparing a poolside area for tiling, ARDEX K 301 provides a cost-effective, reliable foundation for your project.

Coverage: Approximately 7.8m2 at 2mm thick per 25kg bag.