Description
Ardex A38 MIX Floor Screed is a pre-blended mix incorporating the standard Ardex A38 Screed Cement with graded sands. It has been specially formulated to produce ultra-rapid drying floor screeds for internal and external locations.
With ‘RAPIDRY PLUS FORMULA’ Technology, an Ardex A38 MIX screed can be walked on just 3 hours after application and ceramic and natural stone tiles can be installed after just 4 hours irrespective of thickness, making it ideal for fast track tiling projects. Resilient floorcoverings such as carpet, vinyl and wood can be installed after 48 hours irrespective of thickness.
Ardex A38 MIX Floor Screed achieves rapid strengthening 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.
Ardex A38 MIX Floor Screed is used to produce bonded, unbonded and floating screeds for internal and external locations, including wet areas such as swimming pools. Ardex A38 MIX 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.
Thickness:
Ardex A38 MIX screeds should be applied to the following thicknesses as recommended by BS 8204-1 or BS 5385-3: Bonded screeds: 15mm – 40mm Unbonded screeds: 40mm+ Floating screeds: 75mm+ or 65mm+ in lightly loaded/domestic locations. When used for screed repair, Ardex A38 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 1.75 litres per 25kg bag of Ardex A38 MIX. To achieve rapid drying and strength development, do not exceed the stated maximum.
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 etc., 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 in the datasheet. Apply Ardex A38 MIX at temperatures above 5°C.
Applications over underfloor heating systems: When an Ardex A38 MIX screed has been laid on a hot water floor system, 3 days should be allowed to elapse before heating the water up to a 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.
Drying Time:
Ardex A38 MIX can be walked on just 3 hours after application and ceramic and natural stone tiles installed after just 4 hours, irrespective of screed thickness. Resilient floorcoverings such as carpet, vinyl, rubber & wood can be installed after 2 days. The screed will be fully dry after 48 hours.
Surface Finish:
Before fixing ceramic tiles and quarry tiles, etc., the screed should be finished with a wood float. Prior to laying thin floorcoverings e.g. vinyl sheet, a very smooth surface may be obtained using any of the ARDEX levelling compounds which should be selected with the final floor finish in mind. Please see the relevant ARDEX datasheets for further information.
NOTE: Screeds are not designed as wearing surfaces, and should be given adequate protection once dry against damage, wear and contamination during subsequent building operations. Protective coverings will also minimise any curling and lipping at joints in unbonded screeds.
Coverage:
Material requirement is approximately 1.85kg of Ardex A38 MIX per m2 per millimetre of screed thickness i.e. approximately 0.5m2 at 25mm thick or 0.8m2 at 15mm thick per bag.
Technical Data:
Weight of fresh mortar: approx. 2.2kg/litre
Working time at 20°C: approx. 1 hour
Walkability at 20°C: approx. 3 hours
COMPRESSIVE STRENGTH (DIN 1164)
After 1 day 25.0 N/mm²
After 7 days 35.0 N/mm²
After 28 days 40.0 N/mm²
TENSILE BENDING STRENGTH (DIN 1164)
After 1 day 4 N/mm²
After 3 days 4.5 N/mm²
After 28 days 5.5 N/mm²
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