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TOPCEM

TOPCEM
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Special hydraulic binder for normal setting, fast drying and shrinkage controlled screeds manufactured to BS 8204-1 WHERE TO USE Formation of bonded, unbonded and floating or heated screeds on both existing and new concrete prior to the installation of wood, PVC, linoleum, ceramic tiles, natural stone, carpet or any other flooring where rapid drying is required for short installation times. Suitable for indoor and outdoor use. Some application examples • Formation of screeds set to light foot traffic after 12 hours. • Formation of screeds on which ceramic tiles can be laid after 24 hours. • Formation of screeds on which natural stone can be laid after 2 days. • Formation of screeds on which resilient flooring and wooden flooring can be laid after 4 days. • Patching and repairing floor screeds where rapid restoration is required. • Preparation of screeds incorporating underfloor heating systems without the need for polymer additives. TECHNICAL CHARACTERISTICS Topcem is a special hydraulic binder which, when mixed with graded aggregates and water, can produce an early drying high strength screed ready to receive floor finishes between 24hrs and 4 days. Topcem is defined within BS 8204 -1 section 5.1.3 part f. USES • High traffic areas such as airports, shopping centres, schools, hospitals etc. • Fast track construction where the screed needs to be trafficked or overlaid early. • Suitable for thin resin or cementitious systems such as Mapefloor or Ultratop. • Suitable for underfloor heating systems. • Suitable for use where BRE screed test category A or B is required. RECOMMENDATIONS • Do not mix Topcem with other cement, lime, gypsum or Mapecem etc. • Do not leave Topcem dry-mixed with aggregates, immediately add the correct quantity of water to the mix. • Do not mix Topcem just with fine sand, use aggregates graded to BS En 13139 0/8. • Do not mix Topcem with an excessive quantity of water. • Do not add water and remix Topcem after it has started to set. APPLICATION PROCEDURE Preparating the substrate All substrates are suitable for receiving a Topcem screed. For unbonded screeds Isolate the substrate with a sheet of polyethylene or similar; in the case of rising damp provide a suitable waterproof membrane. For bonded screeds the substrate must be dry, resistant to compression and tension, free from cracks, dust, loose material, oil, paint, wax and traces of gypsum. For other types of substrates consult MAPEI’s Technical Services Department. UNBONDED SCREEDS (min 35 mm thick) Preparing the mix Carefully mix the Topcem with graded aggregates 0/8 mm in diameter and water, in a mixer or screed pump for at least 5 minutes. The mix must be spread, tamped and levelled in the shortest possible time and in any event not more than an hour after preparation. Particular care must be taken with the quantity of water which must be such as to obtain a mix with a “damp earth” consistency that under a float finish

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will compact to produce a closed and smooth surface without water bleed. Topcem, aggregates and water can be mixed using: • a forced action mixer; • an ordinary concrete pan mixer; • a screw mixer; • an automatic pressureised screed pump. Mixing manually with a shovel is not recommended as it does not permit good dispersion of the Topcem components resulting in the need to increase the quantity of water in order to obtain the right mix. Where it is not possible to use a mechanical mixer and for small areas that require mixing by hand, it is recommended to thoroughly dry mix the Topcem with...

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PRODUCT IDENTITY

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STRENGTH PROPERTIES EN 13892 AND MOISTURE IN SCREEDS WITH TOPCEM (20 kg), GRADED DRY AGGREGATE 0-8 mm (160 kg) AND WATER (11 kg) Topcem is not a rapid setting binder, therefore workability is like a normal cement screed. COMPRESSIVE STRENGTH IN FUNCTION OF DOSAGE OF TOPCEM ■o Q) -C </> 3 o-o </> c 3 o o <u « « £ ° 1.1 N.B. Whilst we try to ensure that any advice, recommendations or information given in our literature is accurate and correct, we have no control over the circumstances in which our product is used. It is therefore important that the end users satisfy themselves that the...

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