KORODUR Rapid Screed Binder FSCem

Application

For the production of cement screeds that can be quickly covered indoors and outdoors

• in a composite
• on a separating layer
• on an insulating layer
• as a heating screed

As a substrate for the installation of KORODUR/NEODUR screeds, KORODUR exposed screeds, coatings, tiles, natural stone slabs, cast concrete stone slabs, parquet, laminate as well as elastic and textile coverings. KORODUR FSCem can also be used to produce wear-resistant floor screeds, e.g. with KORODURVS 0/5 hard material aggregate. KORODUR FSCem is also suitable for repairing and renovating old concrete floors, repairing cementitious substrates before screed installation, and setting ground anchors and fence posts.

Properties

• : faster curing,
• quick-drying,
• volume stable,
• almost shrinkage- and stress-free
• , crack-free, hardening,
• shortened construction time
,
• quickly usable and verifiable
• , waterproof, suitable for wet rooms,
• electrostatic, non-rechargeable
,
• non-flammable, physiological
• and ecologically harmless
,
• pumpable

Processing

• Mixing: Always mix KORODUR FSCem homogeneously with a compulsory mixer with screed sand 0/8 mm (according to EN 13139, grading curve A8 - B8) and cold, clean water. Set the stiff plastic consistency, taking into account the moisture of the aggregate. When using screed compressed air conveyors, the recommended filling quantities of the respective machine manufacturer must be observed. When installed in a composite, KORODUR VS 0/5 hard material can alternatively be used as an aggregate to increase wear resistance.

• General processing instructions: Quickly apply, compact, peel and smooth KORODUR FSCem rapid screed in an even layer thickness. For mechanical smoothing, only use hand-held single-disc smoothing machines. Only advance as much area as can be processed within the processing time. Edge and movement joints are to be adopted. Higher temperatures shorten, lower temperatures increase processing time. For outdoor surfaces, in draughts or with low humidity, the rapid screed must be protected with foil to prevent it from drying out too quickly. The readiness for installation must be ensured by checking the residual moisture with the CM device.

• Underfloor heating: Heating can be carried out from the third day after installation with a flow temperature of + 25 °C. For further procedures and information, see the corresponding standards and leaflets, e.g. BEB leaflet "Interface coordination for surface heating and cooling systems in new buildings".

When

used as a composite screed, all joints in the load-bearing concrete must be adopted. The screed must be separated from rising components (walls, columns, etc.).

Delivery form

• 25 kg special paper packaging
,
• big bag

storage

dry storage, like cement. Shelf life approx. 12 months.

Mixing ratio (exemplary 1:4 in weight parts* Quality CT-C50-F7):

• KORODUR FSCem: 75 kg
• Screed sand A8 - B8: 300 kg
• Water/cement value: approx. 0.42

Mixing ratio (exemplary 1:5 in weight parts* Quality CT-C40-F6):

• KORODUR FSCem: 60 kg
• Screed sand A8 - B8: 300 kg
• Water/cement value: approx. 0.40

Colour binder: grey

Compressive strength [N/mm2] (after 28 days, measured on defined prisms according to DIN EN 13892-2):

• MV 1:5 in weight parts: after 3 days approx. 25 N/mm2
• FSCem: Screed sand: after 28 days approx. 40 N/mm2

Flexural tensile strength [N/mm2] (after 28 days, measured on defined prisms according to DIN EN 13892-2):

• MV 1:5 in weight parts: after 3 days approx. 4 N/mm2
• FSCem: Screed sand: after 28 days approx. 6 N/mm2

Temperature (processing, ambient and substrate temperature): ≥ 5 °C

Processing time (depending on the respective type of installation and water dosage): approx. 45 - 60 minutes

residual moisture (CM measurement after installation / MV 1:4 and 1:5 see above):

• after 24 hours: approx. 5.9 %
• after 3 days: approx. 1.9 %
• after 28 days: approx. 1.3 %

layer thickness (according to DIN 18560, For layer thicknesses up to 25 mm, the use of aggregate of grain size 0/5 mm is recommended, e.g. with hard material KORODUR VS 0/5.):

• on separation layer at least: 35 mm
• in combination (with KORODUR HB 5/60 rapid): at least 15 mm
• on insulation layer: at least 40 mm
• as heating screed (from the top edge of the heating pipe): at least 40 mm

load / use (depending on the respective type of installation and water dosage):

• after approx. 3 hours