Description
Ardex A35 MIX Rapid Screed is a mix of standard Ardex A35 Cement that is pre-blended with graded sand for convenience – just add water. Ardex A35 MIX is specially formulated to produce ultra-rapid drying floor screeds, bonded, unbonded and floating screeds for internal locations. It can also be used for large repairs to existing cement/sand screeds. It is ideal for situations where early foot traffic and rapid hardening is required.
With ‘RAPIDRY FORMULA’ Technology, Ardex A35 MIX can be walked on just 3 hours after application and ceramic and natural stone tiles can be installed after just 24 hours irrespective of thickness. Resilient floorcoverings such as carpet, vinyl and wood can be installed after 24 hours, or if smoothed with Ardex A55 Ultra Rapid Drying Self Smoothing Compound, carpet and vinyl can be laid after just 4 hours.
Ardex A35 MIX achieves rapid strength and will pass a BRE Screed (ISCR) Test after just 6 hours. After a day, it will also exceed the acceptable minimum compressive and tensile bending strengths attained by ordinary cement screeds after 28 days.
Thickness:
Ardex A35 MIX should be applied to the following thicknesses: Bonded screeds: 15mm – 40mm Unbonded screeds: 40mm+ Floating screeds: 75mm+ or 65mm+ in lightly loaded/domestic locations. When used for screed repairs, Ardex A35 MIX can be applied to the full thickness of the existing cement/sand screed.
Water Content:
Add sufficient water to obtain a workable mix, up to a maximum of 2 litres per 25kg bag of Ardex A35 MIX. To achieve rapid drying and strength development, do not exceed the stated maximum water content.
Mixing:
Mix to a normal screed mortar consistency. When a sample of the mortar is squeezed in the hand, the sample should retain its shape and not crumble, and the hand should be left slightly moist. When a sample is compacted on the base, no film of water should form on the surface.
Mixing should be performed using a pan, trough or other forced action type. Normal ‘free-fall’ mixers are not suitable for mixing semi-dry screed mortars. Use clean equipment and do not use other cements, lime or screed additives in the mix.
Application:
The working time of the mixed mortar is approximately 1 hour at 20°C, therefore mixing, placing, compaction and trowelling off must proceed without delay. The amount of mortar mixed and the area to be screeded should be limited so that trowelling off and finishing can be completed within this time.
Where a new bay is laid against a set and hardened screed, it is recommended that day work joints are vertical and treated with the grouting slurry, as described under SUBSTRATE PREPARATION. Apply Ardex A35 MIX at temperatures above 5°C.
Application over underfloor heating systems: When Ardex A35 MIX has been laid on a hot water floor system, 3 days should be allowed to elapse before heating the water up to a flow temperature of 25°C; this should then be maintained for a further 3 days. The maximum floor temperature should then be used and maintained for a further 4 days. Throughout this time, draughts across the screed must be avoided. The floor should then be allowed to cool down to room temperature (above 15°C) before laying floorcoverings. NOTE: Ardex A35 MIX screeds can be thermally loaded up to 65°C (water temperature).
Drying Time:
Ardex A35 MIX can be walked on just 3 hours after application and ceramic and natural stone tiles installed after just 24 hours, irrespective of screed thickness. Resilient floorcoverings can be installed after 24 hours, or 4 hours for carpet, vinyl and rubberwhen smoothed with Ardex A55 Ultra Rapid Drying Self Smoothing Compound. The screed will be fully dry after 24 hours.
Coverage:
Material requirement is approximately 1.85kg of Ardex A35 MIX per m² per millimetre of screed thickness i.e. approximately 0.5m² at 25mm thick or 0.9m² at 15mm thick per bag.
Technical Data:
Weight of fresh mortar: approx. 2kg/litre
Working time at 20°C: approx. 60 minutes
Walkability at 20°C: approx. 3 hours
COMPRESSIVE STRENGTH (DIN 1164)
After 1 day: 25.0 N/mm²
After 3 days: 32.0 N/mm²
After 28 days: 40.0 N/mm²
TENSILE BENDING STRENGTH (DIN 1164)
After 1 day: 5.0 N/mm²
After 3 days: 6.0 N/mm²
After 28 days: 7.0 N/mm²
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