SikaScreed BB Slurry is a one component, primer for SikaScreed HardTop 80. SikaScreed HardTop 80 is a special cement binder based mortar which is not compatible with standard Portland cements and therefore the only permissible cementitious bonding bridge is Sika Screed 10 BB (wet on wet method).Read Full Description
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SikaScreed BB Slurry is a one component, primer for SikaScreed HardTop 80. SikaScreed HardTop 80 is a special cement binder based mortar which is not compatible with standard Portland cements and therefore must never be mixed or blended with OPC cements. Therefore the only permissible cementitious bonding bridge is Sika Screed 10 BB (wet on wet method). Alternatively Sikalfoor 161 can be used (wet on wet method) as resin bonding bridge.
The primary requirement for a good bond between the substrate and SikaScreed HardTop 80 is good substrate preparation. This is best carried out by mechanical means, followed by blast cleaning and use of a bond coat of SikaScreed 10 BB.
Substrates must be clean, absorbent (porous), grease and oil free, with no loose or crumbling parts. Laitance, paints or other surface treatment agents must be completely removed. Prior of the application of the SikaScreed 10 BB, the substrate must be saturated surface dry and the surface should have a slightly damp character. Ponding of any water must be avoided.
SikaScreed 10 BB bonding bridge: Mix the pre-batched bonding bridge (25 kg bags) with 6.0 – 6.6 litres of water per bag, for 3 minutes.
Work the freshly mixed SikaScreed 10 BB into the slightly damp concrete substrate with a stiff brush. Mix the SikaScreed HardTop 80 in a paddle mixer and apply on the SikaScreed 10 BB bonding bridge ‘wet on wet’ and screed off to level with battens. Any of the SikaScreed 10 BB bonding bridge that has dried must be removed mechanically and replaced before application of the SikaScreed HardTop 80.
Never mix SikaScreed 10 BB and SikaScreed HardTop 80 with Portland cement or other binders. Do not use the mixing equipment alternately for SikaScreed HardTop 80 materials and cement based mortars.
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