PG55_110 15
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Possible applications
The trowel machine can be used for the machine-assisted troweling of concrete surfaces,
e.g. industrial floors, roller skate rinks, parking decks, sewage plants, basement and garage floors,
screed surfaces, etc.
Pre-troweling
The surface to be smoothed is pre-troweled with
the troweling pan (1).
The right time for pre-troweling has come when a person
walking on the cured concrete surface no longer leaves
footprints behind.
Pre-troweling involves the process of grinding off any
unevenness caused by pouring the concrete and rubbing
the ground-off material into any cavities and recesses that
may exist in the floor.
The concrete surface is leveled. During this process, the concrete surface is compacted
due to a thorough rearrangement of the aggregate particles. Any shrinkage cracks
and pores that may have been brought about by escaping air are sealed. Minimum
size particles shift and settle in the cavities between the larger aggregates. The shifted
particles push any retained water to the surface, where it evaporates.
The number of passes required for pre-troweling cannot be specified exactly as this number
is influenced by various factors (e.g. concrete consistency, ambient temperature, humidity,
etc.). Under normal conditions, however, one to two passes will suffice.
Fine troweling is applied when no more moisture can be
detected on the surface. For fine troweling the troweling pan
is substituted for the troweling blades.
The troweling blades (1) rotate across the concrete surface (2)
at relatively high pressure and at a certain blade angle (
a
).
Fine troweling requires that the surfaces have been pre-
treated with the troweling pan.
Fine troweling
It is recommended to use a second trowel machine for surfaces with an area
exceeding 200 sqm.
The first machine is then used for pre-troweling with a troweling pan.
The second machine is fitted with troweling blades and used for fine troweling.
For the first few passes, the blade angle (a) is usually kept small. The blade angle
increases with the number of passes. A key factor during this process is the weight of the
machine. The wider the angle of the troweling blades and the higher the weight of the
machine acting on the troweling blades are, the harder and, thus, more resistant to wear
the surface is.
Summary of Contents for PG 110
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