SikaScreed®-548

SikaScreed®-548 follows the main requirements of

EN 13185 for class CT-C35-F6

Special cement with admixtures and aggregates

12 months from date of production

Store in undamaged, unopened, original sealed packaging in dry conditions at temperatures between +5°C and +30°C. Protect from direct sunlight, heat and moisture.

~4 mm

-30°C to +80°C, frost resistant

~2.21 kg/l (23°C)

+5°C min. / +30°C max.

For hot weather condition please follow best practices of hot weather application methods or contact Sika Technical Services for advice.

~2 L of water per 25 kg bag

~60 minutes

Times are achieved when the temperatures of mortar, ambient air and substrate are approx. +23°C over the entire period and the relative humidity does not exceed 50%. See also “General information on the application of rapid setting cement screeds”.

Times are achieved when the temperatures of mortar, ambient air and substrate are approx. +23°C over the entire period and the relative humidity does not exceed 50%. See also “General information on the application of rapid setting cement screeds”.

As a guide: ~22.1 kg/m² of mixed material per cm layer thickness

This figure is theoretical and does not include for any additional material required due to surface porosity, surface profile, variations in level or wastage, etc.

For Small to Medium volumes the following equipment is of use:

• Mixing containers
• Weighing scales
• Water containers
• Water measuring container
• Double spiral mix paddle & drill (< 500 rpm)

For Medium to Large volumes the following equipment should be used:

• Weighing scales
• Water containers
• Water measuring container
• Forced action mixer or rotating pan, paddle or trough type. (Compulsory mixer)
• Mixed material carriers/carts ( wheel barrows)

Note : Free fall (tumble) mixers must not be used in any case.

Preparation of substrate for bonded screeds according to BS 8204-1

The substrate must be clean, sound, free from grease, old paint and other residues. Remove heavy contamination mechanically, residues of oil and wax. Smoothed surfaces with a cement slurry on top should be removed by e.g. shot blasting.

Pre-wet the prepared substrate at an early stage, keep damp, apply the bonding agent Sikafloor®-500 and the screed mortar SikaScreed®-548 wet on wet.

• Add SikaScreed®-548 in a forced action concrete mixer and mix with water for approx. 1 minute while mixer is running until a stiffplastic consistency is achieved. The amount of water required per 25kg bag of SikaScreed®-548 is about 2 L.
• Single bags of SikaScreed®-548 can also be mixed in a suitable vessel (e.g. hob bock) with a basket stirrer attached to an electric drill. Put adequate amount of gauging water in the vessel, add SikaScreed®-548 and mix until a stiff-plastic consistency is achieved.

In case of higher water temperature, the water could be cooled down using clean ice.

Spread the mortar with a shovel, trowel or screeding bar, compact, scrape off with a levelling board, rub down with a wooden board and smooth if necessary.

Protect newly applied screed from too rapid dehydration (like wind, direct sunlight eg). The applied screed should be covered with polythene sheet immediately following finishing (with all leading edges lapped and secured) and left covered for a minimum 2 days.

Clean equipment and mixer immediately after application with water. Hardened material can only be removed mechanically.