English - Putzmeister Mörtelmaschinen

Pressemitteilung Nr. 0001-05
A view to France - The "wet in wet - laying" is on the rise
Screed, in its various forms, has been one of the
most established construction materials for
centuries. It was used to secure the supporting
ground in the palace of King Minos in Crete, which,
incidentally, is the oldest use of screed known to
us. Even the builders of the Egyptian pyramids
used an early form of spreadable gypsum screed.
A look “over the fence” to our neighbours in France
reveals that the wet-on-wet laying of bonded
screeds is being used increasingly there to save
time.
Putzmeister Mörtelmaschinen GmbH, one of the
leading manufacturers of screed pumps, was able
to observe this process being used in the
construction of a nursing home in Proisy (Aisne
region). On this construction site, which was
equipped with Putzmeister screed pumps (e.g.
M740DB), the tiling was laid immediately after the
bonded screed was laid and levelled.
The screed was conveyed into the carcass of the
nursing home in Proisy (France) by a Putzmeister
M740.
The screed is conveyed into the carcass of the
nursing home in Proisy (France) by a
Putzmeister M 740
How can such a base be laid in such a short time?
The answer is very simple. Before the workers start
to lay the screed, the ground is prepared with a
contact barrier or adhesive emulsion. This has the
effect that the concrete floor cannot immediately
draw the water back out of the screed. Once the
supporting ground has been prepared,
Presumably, not so much attention was paid to
physical requirements, unevenness or emissions
regulations in those days. However, we can
assume that the drying process took days or
weeks and that it was not possible to lay a base
plate, tiles or other materials until this was
complete. Then, as now, it took a considerable
amount of time until stress or a load could be fully
placed on the supporting ground.
the screed is now mixed using the Putzmeister
Mixokret M740DB and conveyed to the discharge
stand via a 60 m long hose line. The screed is
evenly distributed, levelled and immediately
uniformly strewn with dry cement. This draws the
water from the screed more or less from above
and therefore ensures an accelerated, secure
bond with the tiles, which will then be laid.

Once completed, there is a delay of only 24 hours
before the floor can be walked on without causing
damage.
The tiles are laid immediately. The floor can be
walked on again after only 24 hours. The only limit
is that, because the heat is generated "from below",
the system does not work with underfloor heating.
Contact:
PutzmeisterMörtelmaschinen GmbH
Frank Kretzschmar
Max-Eyth-Str. 10
72631 Aichtal
mm@pmw.de
http://www.moertelmaschinen.de/
The Putzmeister experts observed that 4 workers
were able to use this process to complete a fully
tiled floor of approximately 100 m2 in only one
day. Considering that the usual drying time for
screed can be up to 3 weeks, the wet-on-wet
laying process represents an enormous saving in
both time and money.
2
2