Description
Kerakoll Keracem Eco Screed Binder is a certified, eco-friendly, normal-setting and quick-drying mineral hydraulic binder for high-performance screeds. Ideal for underfloor heating systems.
Kerakoll Keracem Eco, mixed with inert materials of assorted grain size from 0 to 8 mm, creates screeds of high dimensional stability and constant moisture stability, guaranteeing the rapid, safe laying of ceramic tiles after 24 hours and LVT, vinyl and hardwood floors after just 5 days.
- Suitable for internal and external use
- Low water/cement ratio
- Mechanical performances superior to those of Portland cements
- High dimensional stability and long-lasting performance
- Prolonged workability both in the manual and mechanical laying
- Suitable for laying ceramic tiles, porcelain tiles, natural stone, hardwood floors and resilient materials using adhesives
Intended use:
Kerakoll Keracem Eco is for use with screed with normal setting and rapid drying, bonded to the substrate with thickness ≥ 20 mm, floating and unbonded screeds with thickness ≥ 40 mm if mixed with suitable inert materials.
Compatible adhesives for use with Kerakoll Keracem Eco:
– Gel-Adhesives, mineral adhesives with SAS technology, single and two-component organic mineral adhesives
– reactive-epoxy and polyurethane, single and two-component cement-based adhesives, dispersed in water or solvent solutions
Covering materials:
– Kerakoll Keracem Eco can be covered with homogeneous tiles, ceramic, porcelain tiles, klinker, cotto, glass and ceramic mosaic, of all types and formats
– natural stone, recomposed materials and marble including those subject to high deformation or rapid staining due to water absorption
– hardwood floors, rubber, LVT, vinyl, carpets
Substrates:
– insulation castings and flooring in prefabricated concrete or fresh concrete castings, cement-based screeds, lightened concrete, panels for sound-proofing and thermal isolation
Kerakoll Keracem Eco is for use with screeds for internal/external use, in domestic, commercial and industrial applications, also in areas subject to thermal shock and freezing, underfloor heating systems. Do not use Kerakoll Keracem Eco on deformable substrates, without having previously calculated the degree of flexure and having provided for the necessary fractionising joints on the screed; in adherence on concrete castings which have not yet fully cured.
Instructions:
Preparation:
Kerakoll Keracem Eco must be mixed with water and inert materials using tilting mixers, mobile concrete mixers, pressure or screw mixers, following the indicated water/Kerakoll Keracem Eco mixing ratio, until a semi-dry consistency has been obtained, and using an inert material, with assorted grain size from 0 to 8 mm, free from residual traces of earth or dust, to create screeds with thicknesses between 25 and 80 mm. With screeds of lower or greater thicknesses use inert materials with a maximum grain size equal to approximately 1/3 of the required thickness. The percentage of water may vary considerably depending on the grading curve and on the humidity contained in the inert material, therefore it is advisable to start mixing the paste with a small quantity of water and gradually add the remaining part, until the optimum consistency has been obtained.
For laying floors in ceramic and natural stone in residential and commercial buildings not subject to heavy foot traffic or concentrated loads, a dosage of Kerakoll Keracem Eco equal to 200 kg/m3 of inert material is recommended; when laying hardwood floors for the same uses the dosage of Kerakoll Keracem Eco must be at least 250 kg/m3. For uses different from those indicated and subject to heavy, concentrated loads, the proportion of Kerakoll Keracem Eco must be calculated in each separate case, using the technical characteristics given in the data sheet.
Application:
Kerakoll Keracem Eco can be applied in a practical and safe manner, following the traditional phases required to produce cement-based screeds: i.e. preparation of level belts, casting and compacting the paste, levelling and final smoothing with a float or by mechanical means. The compacting phase is particularly important to ensure the highest levels of mechanical performance. The finishing of the screed, carried out by moistening it with water and using a rotating steel disk, can result in the creation of a surface crust which is not very absorbent and will extend the drying time of the screed and worsen the performance of the adhesive. At the point where tubing is installed, where the thickness of the screed might be finer (minimum 2 cm), it is necessary to insert a tight-mesh, galvanized metal reinforcement grid (2 – 3 cm). At the point corresponding with day joints caused by interruption of the work process, it is necessary to make a connection between the two castings, inserting iron rod bolts of ≈ 50 cm length and 5 Ø with a distance of approximately 20/30 cm between one rod and the next, or a section of electro-welded mesh (Ø 5 mm, 20×20 cm mesh size) and applying to the wall of the casting, before continuation of the work, a slurry key prepared with 2.5 parts of Kerakoll Keracem Eco, 1 part of eco-friendly, water-based Kerakoll Keraplast Eco P6 and 1 part water.
Technical Data:
Appearance: mixture of binders
Apparent volumetric mass: ≈ 0.96 kg/dm3 UEAtc/CSTB 2435
Pack: 20 kg bags
Mixing water: see table on the product datasheet
Dosages:
– laying ceramics tiles ≈ 200 kg/m3 sand 0 – 8 mm EN 13139 – DIN 1045-2:A/B
– laying of hardwood floors ≈ 250 kg/m3 sand 0 – 8 mm EN 13139 – DIN 1045-2:A/B
Pot life: ≥ 3 hrs
Temperature range for application: from +5 °C to +35 °C
Foot traffic: ≈ 8 hrs
Waiting time before laying (thickness 5 cm):
– ceramic tiles ≈ 24 hrs
– LVT, vinyl and hardwood floors ≈ 5 days
– resilient materials ≈ 12 hrs
Coverage ≈ 2 – 2.5 kg/m2 per cm of thickness
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