Recomendations Of Use - ENAR QP Manual De Instrucciones

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RECOMENDATIONS OF USE

The screeds are used to the vibration and the finishing of the floors. You can work directly on the
surface with guides. Before starting the guides must be adapted. Then the steel structure is posed
on the concrete mass. The screed is laid over the guides and the work can start. (two operators are
demanded). Thanks to its weight and to its mechanism producing a powerful vibration, the screed is
ideal to smooth rapidly and easily the floors (more than 15 cm).
For the floors which measure more than 30 cm the concrete mass is also vibrated with vibrating
equipment before the finishing with the screed.
In order to get a good finishing of the concrete surface, we recommend you to follow these
instructions:
1.- Before pouring the concrete mass on the structure, it is necessary to properly level the concrete
mass. To an easier compaction of the concrete, you should use the vibrating pokers additionally. It's
important to take references or levels out of the mass to see the level objective clearly. The markings
of the feet and tools disappears after the last pass of the screed. The vibration wave produced
reaches a depth until 18 cm depending on the type of concrete mass.
2.- When the mass is prepared, the screed is laid over the concrete mass with the motor running at
the top speed and you must pull the handles slightly in order not to spring over the surface and not
create "waves" and "markings" with edges. Pull constantly the screed, it is important to get a smooth
surface. The screed must be always in contact with the concrete when working. The screed must not
show a big resistance to pulling, it must slip over the concrete. The speed to pull the screed depends
on the depth and the consistency of the mass.
3.- To judge the quality of the vibration, the markings of the feet and of the beam must disappear. In
the case of the concrete is not really smooth repeat the previous instruction.
4.- Then, we see a mix that we call "milk" on the surface (3-4 mm water, concrete, small sand
particles).
5.- The water will evaporate quickly and the surface becomes dull. The fine layer called "milk" is
acting as a cinder paper for the under layers and avoids the sweating effect. The water stays in the
under layers and the surface moistens.
6.- Some hours later, the concrete is ready for additional finishing operations. You can use a trowel
(single or double ride-on-type) or re-vibration equipment (double roller unit with integrated vibrating
system). The machines provide a higher resistance to wearing but are not required for all the types
of floors.
EXTENSIBLE DOUBLE BEAM VIBRATING SCREEDS
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