Concrete vibrators are tools used on construction sites to eliminate air bubbles and ensure a smooth finish in concrete pouring, particularly in large load-bearing projects. They come in various sizes and types, from battery-powered wands to larger units for deep pours, and typically consist of a power unit and a vibrating head. Additional equipment, such as vibrating tables, are used for compacting stiff concrete mixes in precast applications.

1. Title

3. I. A concrete vibrator is a construction tool
typically used on concrete pouring sites.
II. The vibrators are used to ensure that the
pour is free of air bubbles and are even.
This is so that the concrete remains strong
and has a smooth finish even after
removal of the form work.
III. It is not exactly necessary for small jobs
but it can be essential for large load
bearing projects.

4. IV. The machines range in sizes from small
battery powered wands to larger plug in
versions that are used on very deep
pours.
V. Attachments are selected on the basis
of depth and type of concrete used
during the concrete pour.
VI. A typical concrete vibrator utilizes an
off-center weight that spins at 10000
times a minute

5. They are also called
im m e rsio n, po ke r o r ne e dle
vibrato rs.
They essentially consist of a
power unit and a long
flexible tube at the end of
which a vibrating head is
attached.
Power is provided by electric
motor, compressed air or

6.  They are clamped
to the formwork
horizontally and
vertically at suitable
spacing not
exceeding 90 cm in
either direction
 As the work
progress they are
shifted. They
vibrate the concrete

7.  They are also called screed or
pan vibrators.
 They are clamped to the screed.
They vibrate the concrete from
the surface at the time when
screeding (striking off) of the
concrete is carried out. They are
effective only if depth of concrete
is upto 20 cm.

8.  if the depth is more they can be used in
combination with internal vibrators. They
are used for long horizontal surfaces such
as pavements and slabs.

9.  These are rigidly built
steel platforms
mounted on steel
springs and driven by
electric motors.
 The concrete is placed
in moulds mounted on
the platforms and
securely clamped to
the vibrating table, so
that mould and
concrete vibrate in
union.
 Vibrating tables are used for
compacting stiff and harsh mixes
used in precast structural members in
factories and laboratory specimens.

11. RESULT DUE TO IMPROPERUSE