SUBSTRATES DIVISIONPROFESSIONAL, HIGH-RESISTANCEBINDERS AND SCREEDS

Professional, superior-technologyready-for-use screed with high

resistance, normal setting and rapiddrying, compensated shrinkage and

high thermal conductivity, suitable forlaying ceramic tiles, homogeneous tiles,

natural stone, parquet and resilient materialswith adhesives. Ideal for underfloor heating

systems.

AVANT-GARDE TECHNOLOGY – The technological innovation of KERACEM® PRONTOrevolutionises screed techniques in the restoration of dwelling houses or buildings where activities

are ongoing during the execution of works, in the absence of an organised building site and intown or city centres. KERACEM® PRONTO overcomes the difficulty of finding suitable inert

materials, prevents dosage errors and allows for mechanical application also in extremeclimatic conditions, ensuring the creation of professional screeds characterised by higher

levels of reliability and improved performance.

HIGH DIMENSIONAL STABILITY – Slow-drying screeds with high levels ofhygrometric shrinkage require long waiting times before allowing for professional laying

of ceramic or covering materials sensitive to humidity. The KERACEM® PRONTOtechnology rapidly develops a high hydraulicity, a high level of dimensional stability

and constant hygrometric balance, thus ensuring rapid and secure laying ofceramic tiles after 24 hours and parquet after only 5 days.

HIGH MECHANICAL RESISTANCE – A mix of high-resistance hydraulicbinders ensures mechanical performance superior to that of screeds created

with Portland cement. The use of specific, low-viscosity polymers completesthe chemical structure of KERACEM® PRONTO, reduces interstitial porosity

and increases compactness, i.e. the essential conditions for long-lifescreeds subject to heavy traffic.

Developed by the Research and Development Division and guaranteed by the Training Center.Compliant with the CARE Project for the Protection of Health and the Environment:

Substrates Division (Method M1 – Action F106).

KERACEM ® PRONTO

Screeds with normal setting and rapid drying. Adherent screeds with thickness ≥ 20 mm,floating screeds with thickness ≥ 40 mm. Maximum thickness 80 mm.

Compatible adhesives:- cement-based adhesives with SAS Technology, reactive-epoxide and polyurethane two-

component products, dispersed in water and in solvents solutions

Covering materials:- homogeneous tiles, ceramic tiles, klinker, cotto, glass and ceramic mosaic, of all types and

formats- natural stone, recomposed materials, marbles, also subject to a high degree of deformation

or sudden staining due to water absorption- parquet, rubber, PVC, linoleum, moquette

Substrates: - insulation castings and flooring in prefabricated concrete or fresh concrete castings, cement-

based screeds and lightened concrete

UseScreeds for indoor/outdoor use, in civil, commercial and industrial applications and for street furniture, also inareas subject to thermal shock and freezing, heat-radiant slabs.

Do not use On deformable substrates, without having previously calculated the degree of flexure and having provided for thenecessary fractionizing joints on the screed; in adherence on concrete castings which have not yet fully cured.

AREAS OF USE

KERACEM® PRONTO

High-resistance screeds or heat-radiant slabs must be produced with a professional, superior-technology ready-for-usescreed with compensated shrinkage, normal setting and rapid drying, such as KERACEM® PRONTO manufactured byKerakoll, for an average thickness of ____ cm, suitable for laying ceramic tiles after 24 hours and parquet after 5 days. Thesupply and installation of deformable bands in polyethylene foam for desolidarisation joints, fractionizing of surfaces inlarge areas and finishing with trowel or rotating steel disk are included. Compliant with DIN 18 560, Class ZE 20. Averagecoverage ≈ ____ kg/m2.

ABSTRACT

PREPARATION OF SUBSTRATES

The substrate must be dimensionally stable, clean, dry, free from any rising damp, without cracks, free from dustand loose, crumbling parts and must present a degree of mechanical resistance suitable for its use. The screedto be covered must be desolidarised from all vertical elements by means of a band in deformable material witha thickness of ≈ 8 – 10 mm, along the entire height of the screed.The structural joints present in the substrate must be created accordingly also in the thickness of the screed.Adherent screeds: in the case of irregular substrates with screed thicknesses which are variable or in any caseless than 40 mm it is advisable to prepare the substrate positioning, between the midpoint and lower third ofthe total thickness of the screed, an electro-welded 50x50 mm mesh of Ø 2 mm, to be anchored to the substrate.To improve adhesion to the substrate apply a slurry key "wet on wet", prepared with 2.5 parts 32.5 – 42.5cement, 1 part concentrated, polymeric P6 latex and 1 part water.Floating screeds: when laying water-sensitive flooring or in the case of substrates with a risk of rising damp orwhich are not perfectly matured, it is indispensable to create a vapour barrier over the substrate (which shouldbe smooth and free from rough parts) using sheets of polyethylene or PVC. The sheets should be laid overlappingone another by at least 20 cm, sealed with adhesive tape and turned up on the walls and vertical elements suchas pillars to a height corresponding with the entire thickness of the screed.Screeds on compressible substrates:on lightened, low-density substrates or in the presence of layers (also thinlayers) of thermal/acoustic insulating materials, provide for screed thicknesses and possibly also reinforcementcalculated on the basis of the deformability class of the materials mentioned.

INSTRUCTIONS FOR USE

SPECIAL NOTES

Elastic joints: expansion joints must be provided for, as in the case of traditional cement-based screeds,at thresholds, niches, corners, edges, wall openings and fractionizing joints in the case of largecontinuous surfaces. The structural joints present in the substrate must be created accordingly also in thethickness of the screed.

Measurement of humidity: residual humidity can be measured correctly only with a calcium carbidehygrometer. Normal electric hygrometers are not recommended as they will provide unstable andincorrect values owing to the special binders used.

PreparationKERACEM® PRONTO must be mixed with clean water using common building-site equipment such astilting mixers, mobile concrete mixers, pressure or screw mixers, following the indicated water/KERACEM®

PRONTO mixing ratio, until a semi-dry, compact consistency has been obtained without surface bleedingof water. When working with temperatures close to 0 °C, protect the bags of KERACEM® PRONTO againstovernight frost and use warm water to improve mixing, transportation, pumpability and workability of themixture. On the contrary, in the case of high temperatures the bags of KERACEM® PRONTO kept at thebuilding site must be stored in the shade and cold water must be used.The ideal equipment for the production of screeds with a semi-dry consistency such as KERACEM®

PRONTO is a pressure-mixer with pneumatic transportation. With a tank capacity of 260 litres it ispossible to insert 11-13 30 kg bags of KERACEM® PRONTO for each mixing operation. Before closingthe hatchway add ≈ 22 – 26 litres of water. With a tank capacity of 190 litres, insert 8 – 10 bags and≈ 16 – 20 litres of water.

ApplicationKERACEM® PRONTO can be applied in a practical and secure manner, following the traditional phasesrequired to produce cement-based screeds: i.e. preparation of level belts, casting and compacting thepaste, levelling and final smoothing with a spreader or by mechanical means. The compacting phase isparticularly important to ensure the highest levels of mechanical performance; it must be carried outimmediately after laying the screed on the substrate and before regularisation of the surface by meansof a metal float. In the case of high thicknesses, beating must be carried out various times until therequired thickness is obtained. The finish of the screed, carried out by moistening it with water and usinga rotating steel disk, very often results in the creation of a surface crust which is not very absorbent andwill extend the drying time of the screed and worsen the performance of the adhesive. At the pointwhere tubing is installed, where the thickness of the screed might be finer (minimum 2 cm), it isnecessary to insert a tight-mesh, galvanised metal reinforcement grid (2 – 3 cm). At pointscorresponding with construction joints caused by interruption of the work process, it is necessary tomake a connection between the two castings, inserting iron rod bolts of ≈ 50 cm length and 5 mm Øwith a distance of ≈ 20 – 30 cm between one rod and the next, or a section of electro-welded mesh (Ø5 mm, 20x20 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 32.5 – 42.5 cement, 1 part of concentrated, polymeric P6 latexand 1 part water.

CleaningResidual traces of KERACEM® PRONTO can be removed from machinery and tools with water beforethe product has hardened.

Compressive strength:- after 3 days ≥ 20 MPa EN 196/1- after 7 days ≥ 25 MPa EN 196/1- after 28 days ≥ 30 MPa EN 196/1Residual humidity:- after 24 hours ≤ 3%- after 5 days ≤ 2%Thermal conductivity coefficient λ ≥ 1.05 W/mK Inst. Giordano 131719Conformity ZE 20 DIN 18 560

WARNING

TECHNICAL CHARACTERISTICS

FINAL CHARACTERISTICS

TECHNICAL DATA compliant with Kerakoll Quality Standard

- Product for professional use- do not add other binders, inert materials or additives to the mixture- low temperatures and high relative environmental humidity lengthen screed drying times- an excessive quantity of water reduces mechanical resistance and the rapidity of drying- before laying parquet and resilient materials, check residual humidity with a calcium carbide hygrometer- do not add water to KERACEM® PRONTO during the setting phase- do not moisten the screed once it has been created; protect from direct sunlight and air currents for the first 24 hours- if necessary, ask for the safety data sheet- for further information please consult the Kerakoll Worldwide Global Service +39-0536.811.516

Mixing water ≈ 2 l / 1 bag 30 kgSpecific weight of the mixture ≈ 1.93 kg/dm3 UNI 7121Pot life ≥ 3 hTemperature range for application from +5 °C to +35 °CMinimum thickness:- floating screed ≥ 40 mm- adherent screed ≥ 20 mmMaximum thickness for adherent screed ≤ 80 mmFoot traffic ≈ 8 hWaiting time before laying:- ceramic tiles ≈ 24 h- parquet ≈ 5 daysCoverage ≈ 16 kg/m2 per cm of thickness

Appearance Mix of binders and inert materialsApparent volumetric mass ≈ 1.65 kg/dm3 CSTB 2435Mineralogical nature of inert material Silicate-crystalline carbonateGranulometric interval ≈ 0 – 2.5 mm UNI 10111CARE Method M1 – Action F106Storage ≈ 12 months in the original packaging in dry environmentPackaging Bags 30 kg

Values taken at +23 °C, 50% R.H. and no ventilation. Data may vary depending on specific conditions at the building site.

Values taken at +23 °C, 50% R.H. and no ventilation. Data may vary depending on specific conditions at the building site, i.e. temperature andventilation.

ANTICHE SCUDERIE PAPALI AL QUIRINALE

KERACEM® PRONTO

KERAGRIP

KERATECH® R10Professional, hyper-fluid, self-levelling productwith HDE Technology, with extra-rapidsetting and drying, for high-resistancecorrection of irregular substrates

Professional, superior-technology adhesionpromoter with low MFFT, for non-absorbentsubstrates, before application of levelling andself-levelling products

Professional, superior-technologyready-for-use screed with high

resistance, normal setting and rapiddrying, compensated shrinkage

Rome - ITALY

KERACEM® PRONTO

The information given here is based on our technical and practical knowledge. As it is not possible for usto directly check the conditions in your building yards and the execution of the work, this informationrepresents general indications that do not bind our Company in any way. Therefore, it is advisable toperform a preliminary test to verify the suitability of the product for your purposes.

© Kerakoll is a trademark owned by Kerakoll International Rotterdam - The NetherlandsCode F101/2004-I

T +39-0536.816.511

F +39-0536.816.581

E info@kerakoll.com

W www.kerakoll.com

THE KERAKOLL GLOBAL SERVICE

KERAKOLL QUALITY STANDARD

SAFETY, HEALTH AND THE ENVIRONMENT

Wherever you are, and whatever your project needs are, you can alwaysrely on the Kerakoll Service: highly-efficient, global customer supportmatching the high quality of our products.Technical Service +39-0536.811.516 - Technical assistance in real timeTraining Service - Professional training to support our quality Guarantee Service - A long-lasting warranty Kerakoll.com - The channel of choice for your projects

In all units of the Kerakoll Group, before being considered suitable forproduction, products undergo stringent testing in accordance with the veryhigh requirements set by the Kerakoll Quality Standard: a process supportedby the Centre for Applied Technology which assists the work of researcherswith its sophisticated resources and laboratories. At the Kerakoll laboratoriesthe various elements of formulations are carefully analysed to identify andeliminate any factors of weakness by means of simulation of real workingconditions in building sites After the testing cycles, the new products aresubmitted to the extreme fatigue of the Safety-Test process.

For an industrial system such as Kerakoll it is vitally important to ensurethat human health and the environment are protected. The Kerakollcompany policy is to ensure that every possible safeguard be taken tomake sure that these factors are always considered, and regulations andspecific methods have been developed over the years for this purpose atall levels of the organisation. The CARE Project is the result of the Group'sconcern for human health and the environment, and ensures that theGroup's products are perfectly safe for use and that the building materialssupplied to builders ensure a very high level of safety before, during andafter their use.