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BRECON External Vibrators for the Concrete compaction Industry
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External Vibrators for the Concrete Compaction Industry
There are 2 methods of compacting concrete via vibration. Wet-cast concrete
gets consolidated by external vibrators mounted to the outside of a mould.
This reduces the cohesion and friction between the components. Grains are
therefore able to become denser and the enclosed air can move upward and escapes.
Dry-cast concrete achieves compaction through external vibrators on top.
With this method the concrete gets pressed and the enclosed air of the concrete
moves out. This method is for example applied in the production of paving
The consolidation of dry-cast concrete
Dry-cast concrete is also used for blocks and pre-fabricated ceillings.
During the production, machinery is used to complete the concreting
and compacting at the same time. In general the compacting results through
external vibrators with a rotational speed of 3000 1/min. The standard required
for vibrators used in this situation is extremely high. The reason
for this is the very short cycle times in which the vibrators are used,
the frequent use of the vibrator during this process and the high forces exerted
on the vibrator during the compression process.
The compacting of wet-cast concrete
To oscillate wet-cast concrete different frequencies are used. During this
process, high oscillation frequencies (100-200Hz) have advantages over low
oscillation frequencies (50-60Hz). During higher frequency vibration, the
coarse grains move less inside the concrete. Even with long vibration times
there is no danger of segregation. In addition to this the liquefaction
of the cement is brought about by high oscillations and vibrations.
The result of the liquefaction of the cement is a very good compaction of the
concrete. During the production of pre-fabricated parts, a vibration frequency
of 100 Hz has been implemented. The reasons for a 100Hz frequency are numerous.
Innovative Vibrator for ICF Concrete Consolidation
Creating good-quality concrete consolidation is essential for strong,
energy-efficient ICF walls. Voids and honeycombing can affect the structural
integrity of the walls. Especially the corners and lintels; these are the
areas that need the most strength and are the areas where poor consolidation
is most likely to occur. These critical areas need adequate vibration.
The use of internal vibrators has several negative affects; they get caught
in the rebar and the loss of equipment becomes costly to the contractor.
With the rise and growth of ICF construction and the emphasis on technical
development, BRECON decided to become part of this great innovation.
Their team of German Engineers embarked on designing a new hand-held tool that
would be imperative and essential in the ICF industry. Vibrating the concrete
from the outside to ensure an even distribution of concrete throughout the ICF