Backpack concrete vibrator SQMG28 PRO

Name: Backpack concrete vibrator SQMG28 PRO
Brand: SIMAQ
SKU: SQMG28

Drives out air for dense, void-free pours.

EngineHonda GX35

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Features

High frequency
Easy to carry on site

Specifications

Power: 1.2 kW (1.6 HP)
Rotation speed: 8000–9000 r/min
Vibrating shaft diameter: 38 mm
Hose length: 3 m

Documents

Spec sheet Engine User Manual Engine Parts Manual SIMAQ operator guide (Spanish)

Backpack concrete vibrator SQMG28 PRO — on the job

SIMAQ on the job

Proven on the real jobsite

Drives out air for dense, void-free pours.

5-minute training

5 min

How to use the concrete vibrator

The immersion vibrator drives trapped air out of fresh concrete so it ends up dense, with no honeycombing. Under-vibrate and you leave voids; over-vibrate and the aggregate sinks while the paste rises.

Get your operator certified for free (Spanish)

01
Pick the unit and the head
No power or a big site → gasoline (SQ28 PRO) or backpack (SQMG28); indoors or noise limits → electric (SQVEH40 or the mini vibrator). Small head for thin or heavily reinforced elements; 38 mm for slabs, beams and footings.
02
Pour and vibrate in lifts
Place concrete in even lifts and vibrate each one before the next. Fill a tall wall or column in one go and the air at the bottom can't get out.
03
Insert vertical and fast
Drop the head in vertically and fast, going a little into the lift below while it's still fresh: that knits both lifts into one piece.
04
Hold 5–15 seconds per point
Vibrate until a thin layer of paste rises and large bubbles stop. Longer doesn't help: it segregates the aggregate.
05
Withdraw slowly
Pull the head out slowly so the hole closes itself. Yank it and you leave an air channel inside.
06
Even, close spacing
Repeat on an even grid, spacing points ~1.5× the action radius so the circles overlap. If no paste shows between two points, move them closer.

Do this

Always insert vertically, on systematic, evenly spaced points.
When shiny paste rises and bubbles stop → withdraw and move to the next point.
On walls and columns, vibrate lift by lift as you pour.
Wash the head and hose when you finish.

Avoid this

Don't drag concrete with the head: you segregate the aggregate.
Don't over-vibrate: water and paste rise, aggregate sinks.
Don't hold the head against the formwork or rest it on the rebar: it marks the exposed face and loosens the steel.
Don't yank the head out: it leaves an air channel.

Safety

Rubber gloves and boots; you're in fresh concrete.
Mind the cable (electric) or hot exhaust (gasoline).
Don't force the hose into sharp bends.

Go deeper in SIMAQ SchoolConcrete vibration

Try it before you use it

«Vibrate the slab» simulator with the SQMG28Put the poker in and see where honeycombing would be if the circles don't overlap.

Applications

What jobs this machine is built for.

Slabs and floor decks
Columns and walls (vibration)
Floor finishing (troweling)
On-site concrete mixing
Concrete paving

Buying guides

Clear up your questions before you quote

Guide · 7 min

Parts of a concrete vibrator: motor, coupling, hose and head

Every concrete vibrator has a motor, a coupling, a hose with a flexible shaft inside and a head that does the vibrating. What each part does, which ones wear and how to look after them so it doesn't lose power.

Read Guide · 6 min

Why does concrete honeycomb, and how do you vibrate to prevent it?

Honeycombs are trapped air and poorly consolidated mix. Why they appear, the vibrating technique that prevents them (vertical, 5–15 s, overlapping points) and which SIMAQ vibrator fits each element.

Read Guide · 6 min

Which concrete vibrator should you buy: electric, gas or backpack?

How to choose a concrete vibrator by power source, head size and mobility. Four SIMAQ models, what each is for and the mistakes that leave honeycombs.

Read