Product Data Sheet Show all documents

SikaScreed®-548

(former MTop 548)

PRE-MIXED FAST SETTING CEMENTITIOUS SCREED MORTAR

SikaScreed®-548 is a one part, cement based, ready-mixed, pre-bagged, fast setting screed, suitable for indoor and outdoor use.

  • Can be tiled after approx. 3 days, already walkable after approx. 1 day
  • Ready-to-mix mortar, no on-site mixing with sand required
  • Long working time can be worked with and smoothed for almost 1 hour despite of short curing time
  • Suitable for application by pump, even at higher temperatures
  • Temperature resistant from -30°C to +80°C, therefore suitable for balconies, terraces, garages, industrial floor coverings cleaned with superheated steam
  • Insensitive to moisture, therefore suitable for areas exposed to permanent wetness
Product Data Sheet Show all documents

Usage

  • Suitable for indoor and outdoor use.
  • Suitable for areas which are exposed to permanent wetness.
  • Fast track bonded screeds and de-bonded screeds installed on an isolating or insulating layer.
  • Suitable for heated screeds.
  • Suitable to be used as repair mortar for concrete floors and cementitious screeds.
 

Advantages

  • Can be tiled after approx. 3 days, already walkable after approx. 1 day
  • Ready-to-mix mortar, no on-site mixing with sand required
  • Long working time can be worked with and smoothed for almost 1 hour despite of short curing time
  • Suitable for application by pump, even at higher temperatures
  • Temperature resistant from -30°C to +80°C, therefore suitable for balconies, terraces, garages, industrial floor coverings cleaned with superheated steam
  • Insensitive to moisture, therefore suitable for areas exposed to permanent wetness

Packaging

25 kg PE lined heavy duty paper bag

Colour

Grey powder

Product Details

Sustainability / Certifications / Approvals

CERTIFICATES AND TEST REPORTS

SikaScreed®-548 follows the main requirements of

EN 13185 for class CT-C35-F6
Product Information

Composition

Special cement with admixtures and aggregates

Shelf life

12 months from date of production

Storage conditions

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.

Maximum grain size

~4 mm

 
Technical Information

Resistance to impact

Category A

(BRA test)

Compressive strength

≥ 35 N/mm2 (28 days cured at 23°C)

(BS EN 13813)

Flexural-strength

≥ 6.0 N/mm² (28 days cured at 23°C)(BS EN 13813)

Temperature resistance

-30°C to +80°C, frost resistant

Application

Application Information

Fresh mortar density

~2.21 kg/l (23°C)

Layer thickness

Minimum

10 mm for bonded screeds

30 mm for pipes and conduits cover

40 mm for screeds on isolating or insulating layer

Maximum80 mm

Ambient air temperature

+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.

Mixing ratio

~2 L of water per 25 kg bag

Application time

~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”.

Applied product ready for use

Foot traffic"~1 day
Can be tiled with ceramic and/or natural stone:~3 days

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”.
Consumption

Consumption

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.
Application steps

EQUIPMENT

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.

SUBSTRATE PREPARATION

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.

MIXING

Mixing technique:

Force action concrete mixer

Conveyor technique:

Pneumatic

Consistency of mortar:

Stiff-plastic

  • 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.

APPLICATION

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.

CLEANING OF EQUIPMENT

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

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