KORODUR exposed screed GRANIDUR BIANCO / NERO

Application

For the production of sanded, decorative screeds in an average layer thickness of 15 mm for sales rooms, museums, showrooms, boutiques, foyers, office and administrative buildings, restaurants, galleries, etc.

Properties

• resistant to mechanical stress
,
• mineral,
• durable,
• non-slip
,
• chloride-free
,
• physiologically and ecologically harmless,
• consistent quality due to quality assurance in accordance with DIN EN 13813

Processing

• Substrate: Prepare the substrate as C25/30 load-bearing concrete or CT-C35-F5 screed, e.g. by milling and shot blasting. Any existing cracks, breakouts and damaged joints must be professionally repaired. Surface tensile strength ≥ 1.5 N/mm2 for trafficked surfaces or ≥ 1.0 N/mm2 for non-trafficked surfaces. The substrate must be load-bearing, firm, clean, dry and free of loose parts, oils, greases or other adhesion-reducing impurities. The requirements of DIN 18365 and DIN 18560-3 apply. Only cementitious concrete systems in accordance with strength class C 25/30 are to be used as load-bearing concrete. Only cementitary, shrink-gut, machine-smoothed screed systems are to be used as carrying screed, layer thickness at least 65 mm. A minimum strength class of CT-C35-F5 in a structure-tight consistency must be selected, e.g. using the volume-stable quick-screed KORODUR FSCem Screed or the faster-curing screed binder KORODUR FSCem (see data sheet).

• Processing: The prepared substrate (concrete) is then thoroughly pre-wetted, but puddles are avoided. Apply KORODUR HB 5 adhesive bridge to the matt damp surface in accordance with the system (see data sheet). Mix GRANIDUR with the specified amount of water in plastic consistency for approx. 3 minutes and apply fresh to the still moist adhesive bridge, peel off in alignment and rub and smooth in a timely manner using a plate smoothing machine to close the pores and smooth (leaf troweling machine).

Aftertreatment

Different temperatures influence the solidification or hardening process. The GRANIDUR exposed screed must be protected from drying out too quickly in accordance with DIN EN 13670 / DIN 1045-3. For post-treatment of the exposed screed layer, we recommend using suitable covers (e.g. 400 g of painter's cardboard).

Joints

All joints in the hardened load-bearing concrete must be taken over in the screed layer. The exposed screed must be separated from rising components (walls, columns, etc.).

Grinding / Polishing Grinding the

GRANIDUR surface with up to 5 sanding passes (coarse, medium and fine sanding) to the desired appearance. The grain structure of the GRANIDUR material becomes visible (terrazzo look). See also specifications for grinding technology MKS Funke / Schwamborn. After sanding passes, wet clean the surface several times using an automatic cleaning machine.

In

order to achieve lasting quality and an attractive appearance, the entire surface must be cleaned deep into the pores after sufficient drying and hardening and then treated. Various products are available on request.

Coloured

products are made exclusively from natural raw materials. Accordingly, color fluctuations cannot be ruled out. Due to the printing technique, deviations from the original colour are possible. We recommend creating a test area beforehand. Coloured floors, especially light colours, should not be treated with aluminium tools such as screed battens and trowels, as this can lead to undesirable discolouration. Here, for example, only plastic wings should be used for smoothing. Fine cracks (e.g. octopus tears) or shrinkage deformations within the system (decorative cement screed) cannot be avoided in principle and therefore do not constitute a defect in this respect.

Delivery form

25 kg paper special packaging

Storage

Store in a dry place like cement. Shelf life approx. 6 months.

Quality:

• all qualities: CT-C45-F6

Grit:

• all qualities: 0 - 5 mm

Colour:

• GRANIDUR BIANCO: light
• GRANIDUR NERO: dark

Fire class (according to DIN EN 13501-1):

• all qualities: A1fl

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

• all qualities: C45

Bending tensile strength [N/mm2] (after 28 days, measured on defined prisms in accordance with DIN EN 13892-2):

• all qualities: F6

Temperature (processing, ambient and substrate temperature):

• all qualities: ≥ 5 °C

Water addition:

• all qualities: approx. 2.50 l/25 kg Container

Layer thickness:

• all qualities: 15 mm

Material consumption (per m2 / per mm layer thickness):

• all qualities: approx. 2.1 kg