Recomendations Of Use - ENAR QGH 25/45 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
superficy 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. (one or until three
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 a vibrating
equipment before the finishing with the screed.
In order to get a good finishing of the concrete superficy, 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 additionnally.
It's important to take references or levels out of the mass to see the level objective clearly. The
markings of the feet ahd 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 support the handle lightly in order not to spring over the surface and not
create "waves" and "markings" with edges. Pull and push contlantly the screed. It is important to get
a smooth surface. The screed must be in contact with the concrete. The screed must not show any
resistance to pulling, it must slip over the concrete. The speed to push and 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 dissappeared.
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 superficy (3-4 mm water, concrete, small sand
particules).
5.- The water will evaporate quickly and the superficy becomes dull. The fine layer called "milk" is
acting as a cinder paper for the underlayers and avoids the sweating effect. The water stays in the
underlayers and the super-ficy moistens.
6.- Some hours later, the concrete is ready for additionnal finishing operations . You can use a trowel
(single or double ride-on-type) or revibration 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.
FIXED AND EXTENSIBLE VIBRATING SCREEDS
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