03 · Concrete Equipment

Concrete Vibrator

Also called Immersion vibrator · Internal vibrator · Poker vibrator · Pencil vibrator

An immersion (poker) vibrator that shakes air pockets out of freshly poured concrete for a stronger result.

Electric (corded)

Overview

Every concrete pour forms tiny air bubbles — thousands of them, depending on the mix and the pour. The more air trapped in the concrete, the weaker it is once it hardens.

A concrete vibrator makes stronger concrete by vigorously shaking it right after the pour, driving out the air bubbles and pockets.

Immersion vibrators, also called internal vibrators, are the most common type. Push the head into the wet concrete, then withdraw it slowly as it vibrates the material around it.

Best uses

Walls, columns and beams
Footings and foundations
Slabs with heavy rebar
Preventing honeycombing and voids

Troubleshooting

Find a symptom

Motor runs but the head doesn't vibrate

Checks to try, in order

Check the flexible shaft is fully connected to the motor.
Look for a kinked or damaged shaft casing.

A broken inner shaft is a workshop repair.

Reference draft — always follow the manufacturer’s manual.

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Head is getting very hot

Checks to try, in order

Only run the head while it's in concrete. Running it in open air overheats it.
Switch off between insertions if there's a delay.

Reference draft — always follow the manufacturer’s manual.

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Tool won't switch onShared · Electric (corded)

Likely causes

Tripped GFCI or breaker
Lock-off button
Damaged cord
Dead outlet

Checks to try, in order

Check the outlet works and reset any GFCI / RCD that has tripped.
Release the lock-off button or safety switch before squeezing the trigger.
Inspect the cord and extension lead for cuts, crushed sections or damaged plugs.
If running from a generator, make sure it's running and its breaker hasn't tripped.

A damaged cord or plug means the tool is out of service. Tag it and return it — never tape a cord.

Reference draft — always follow the manufacturer’s manual.

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Keeps tripping the breakerShared · Electric (corded)

Likely causes

Circuit overloaded
Undersized extension cord
Blunt accessory

Checks to try, in order

Plug into a circuit with nothing else heavy running on it.
Use a shorter, heavier extension cord. Long, thin cords starve the motor and trip breakers.
Don't force the tool — a dull bit, blade or disc makes the motor draw more current.

Reference draft — always follow the manufacturer’s manual.

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Overheating, burning smell or heavy sparkingShared · Electric (corded)

Checks to try, in order

Stop and unplug the tool.
Check the motor vents aren't blocked with dust.
Let it cool, fit a sharp accessory and let the tool's weight do the work.

Heavy sparking from the vents or a burning smell that returns points to worn brushes or a failing motor — workshop only.

Reference draft — always follow the manufacturer’s manual.

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Safety

Don't bend the flexible shaft tightly or pull the unit by the shaft.
Keep the motor dry and out of the concrete.

For electric (corded)

Inspect the cord and plug before every use. Use a GFCI/RCD outdoors or near water.
Unplug before changing blades, bits, discs or pads.
Wear eye protection, and a dust mask when cutting, grinding or sanding masonry.