Description
Ardex K80 Levelling Compound is a specially formulated cement-based compound for resurfacing and levelling existing concrete floors to give a hard, smooth, flat, wearing surface or as a base for suitable paint and resin coatings. It is designed to be combined with Ardex SD-TB Levelling Base Mix, a pumpable Subfloor Pre-Levelling Base Mix, pre-blended with graded aggregate to give significant cost savings on floors that require greater application thicknesses.
Ardex K80 Levelling Compound comes in 25kg bags.
Ardex K80 Industrial Floor System provides the ideal combination of toughness, low maintenance, ease of application and high durability coupled with the incorporation of the unique Ardex ‘Rapidry Formula’. Due to the ‘Rapidry Formula’ chemically binding the mixed water, the Ardex K80 Levelling Compound literally dries within itself at the same time as it rapidly develops strength.
When mixed with water, Ardex K80 produces a fluid self-levelling mortar which can be applied by trowel or pump as a floor finish from 5mm-10mm. Where thick applications are required the cost effective Ardex SD-T B base mix can be initially applied from 10mm-50mm depth to level the concrete base. The ‘Rapidry Formula’ technology of the Ardex SD-T B base mix means that within only hours of its application a minimum 5mm thickness of Ardex K80 can be applied.
Ardex K80 Industrial Floor System is virtually tension free and provides a very high strength surface which has enough resiliency to accept heavy wheeled traffic, such as that found in industrial factories, workshops and warehouses, etc. Independent testing at Aston University has confirmed the excellent inherent abrasion resistance of Ardex K80/SD-TB Industrial Floor System ensuring its suitability for a wide range of applications.
Substrate Preparation:
The concrete surface must be hard, sound and free of dust and other barrier materials such as paint, lime coatings, plaster, curing agents, laitance, adhesive residues, etc., that will inhibit adhesion to the substrate. The surface strength of the concrete must be sufficient to support the Ardex K80. BS8204-3 recommends a minimum surface tensile strength of 0.8N/mm2 for concrete bases to receive wearing or levelling screeds. NOTE: For heavy duty locations or where a subsequent resin coating may be applied, the minimum surface tensile strength should be 1.5N/mm2.
Use Ardex DGR degreaser to remove polish, wax, grease, oil and similar contaminating substances prior to mechanical preparation. Contact our Technical Services Department for further information. Concrete surfaces must be mechanically prepared, either by scabbling, grinding or contained shot blasting equipment or similar, and be vacuumed clean prior to priming. All surfaces need priming. It is recommended to prime with a sand blinded application of Ardex R3E Solvent Free Epoxy Primer or Ardex R5E Rapid Curing Solvent Free Epoxy Primer in accordance with the technical data sheet. The sand used to create a blinded/aggregate keyed surface should be Ardex Fine Aggregate, approximately 1 to 1.5mm in size. Overwatered, or otherwise weak concrete surfaces must be suitably prepared down to sound, solid concrete by mechanical methods. Direct to earth concrete sub-floors must be dry and have an effective damp proof membrane such as Ardex DPM 1C.
When applying Ardex K80 on top of Ardex SD-TB base mix, ensure any contamination is removed prior to priming with Ardex P51 primer mixed 1:2 with water using a broom in accordance with the Priming and Preparation data sheet. The surface of the Ardex SD-T B base mix must be thoroughly primed and the primer allowed to dry prior to applying the Ardex K80. NOTE: Any joints or cracks in the concrete base where differential movement is anticipated e.g. movement joints, should be brought through to the finished surface. Ardex K80 and Ardex SD-TB should not be used in external or areas subject to wetting.
Mixing Ardex K80 Levelling Compound:
To the required amount of clean water in a clean mixing container add the powder whilst mixing thoroughly using an Ardex mixing paddle with a 10mm chuck variable speed (600 -1,000 rpm) electric drill, until a smooth lump free mortar is produced. For each 25kg bag of Ardex K80, add 4 & 3/4 to 5 & 1/4 litres of clean water. Use the minimum amount of water for thick applications or cold conditions. Do not use more than 5 litres per bag.
Application:
Pour the mixed Ardex K80 compound onto the prepared sub-floor. The mixed mortar will flow out and self-level during the first 10 minutes of its 30 minutes working time at 20°C. Use an ARDEX gauging tool with height adjustment for gauging thicker applications. Use an ARDEX long handled smoothing trowel or spiked roller for finishing off depending upon the finish required. Use a pin rake with height adjustment for thicker applications. A spiked roller can be used for finishing off depending on the finish required. Minimum recommended application temperature 10°C. Where large sub-floors require levelling and/or thick applications are required it is recommended to pump Ardex K80/SD-TB Industrial Floor System.
Thickness:
Ardex K80 should be applied at thicknesses between 5 and 10mm.
Coverage:
Approximately 1.65kg Ardex K80 powder/m2/mm, e.g. one 25kg bag will cover approximately 3.0m2 at 5mm thick.
Technical Data:
Working time at 20°C: approximately 30 minutes
Compressive Strength: 1 day: 14 N/mm2, 7 days: 20 N/mm2, 28 days: 32 N/mm2
Flexural Strength in accordance with EN 196: 1 day: 3.8 N/mm2, 7 days: 5.8 N/mm2, 28 days: 9.0 N/mm2
Ball Pressure Hardness: 1 day: 60 N/mm2, 7 days: 65 N/mm2, 28 days: 90 N/mm2
Abrasion Resistance: The abrasion resistance of Ardex K80, when measured in accordance with BS 8204, was rated as at least AR1.
Resistance to chair castors: Yes
Suitable for underfloor heating: Yes
Bulk density: approx. 1.3kg/litre
Weight of fresh mortar: approx. 2.0kg/litre
Working time at 20°C: approx. 1/2hour
Walkability at 20°C: after approx. 2 hours
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