Fresh concrete does not compact by itself because the poor fluidity cannot surpass internal friction. Only vibration can overcome this force.

In fact, vibration promotes:

  • surfacing of air bubbles captured in the concrete;
  • displacement of aggregates resulting in a reduced cavity and giving high density and perfectly even material;
  • adhesion of the concrete to the reinforcement armature bars or any inner structural inserts.

Benefits of using vibrators on concrete:

  • high mechanical strength
  • low level porosity and therefore permeability to water and aggressive agents contained therein
  • no cracks inside the cement and near the reinforcement armature bars
  • completely filled formwork
  • longer life cycle of the concrete
  • high aesthetic results

Concrete consolidation: the types

Immersion vibrators (or Vibrating Poker for concrete)

In construction, for example, of flooring for industrial use, walls, pillars and slabs, flexible and easy to use vibrating devices must be used. In such cases, the immersion vibrator, also called the vibrating poker or needle, is chosen because it was designed for use in contact with cement; therefore such use is also defined direct internal vibration.

External Vibrating Motors

High frequency electric vibration motors are used on building sites and in the production of prefabricated buildings to obtain high quality manufactured parts with exposed cement, with excellent results from the point of view of aesthetic appearance and resistance against atmospheric agents. Vibration is transmitted indirectly to the cement through formworks or moulds.

Contact us!

OLI PRODUCTS FOR Concrete Consolidation


VHA – Internal pneumatic vibrators

The VHA range of pneumatic needles is designed to provide high operating frequency with high working efficiency under...


VHPG – Poker pistol grip

The internal high frequency vibrators of the VHPG range are designed to be light and easily manoeuvrable. Unlike the...


MSP-4 – Multiple socket panel

The MSP-4 is a multiple socket for construction sites. It can be connected to a single socket of the CM (OLI...

CONTROL PANEL – Electronic frequency converter

In large construction sites and prefabricated production sites, in order to obtain better results in terms of quality...

CL and CR – Fastening systems

The CL and CR series products are clamps and cradles for quick fixing of vibrators to formwork or molds for...

HFP – High frequency pneumatic vibrators

Used both in prefabrication plants and on construction sites, OLI high frequency pneumatic vibrators are the ideal...

MVE-HF – External high frequency electric vibrating motors

OLI high frequency electric vibrating motors for outdoor use are characterized by high operating efficiency and ease of...

CM – Frequency and voltage converters

CMs are electromechanical voltage and frequency converters, designed to power high frequency electric vibrators. The...

VH -Electric Poker

The range of electric concrete vibrators of VH is designed to work in direct contact with concrete to optimize...

EWO – High frequency internal vibrators with built-in converter

The "EWO" high frequency immersion vibrators are equipped with a small electronic frequency converter, integrated in...