NEW: Starting from the 1st of August 2016 we offer our clients concrete vibrating machines for rental.
The prices for renting a concrete vibrating machine is 140 lei/day.
This price includes the transport to your site (from Bucharest and surrounding areas).
This service is also available during weekends. More than one machine can be rented, depending on the customer, adapted to the needs of the site.
If concrete is poured into Amvic type columns or walls, a vibrating machine with a small diameter head shall be used (Ø32mm) in order to allow better access to the head of the vibrating machine between the reinforcement bars.
If the concrete is poured into a foundation or into slabs, a vibrating machine with a larger diameter head shall be used (Ø38mm) for a better vibration efficiency.
Technical information: electric vibrator (220V) – different models available:
- 1500W or 2300W engine power
- Lance length: 4 or 6 meters.
- Vibrating head diameter: Ø32mm (it can also be used for vibrating columns with thick reinforcement or cutoff wall (diaphragm seal), including for concrete walls in polystyrene formwork (Amvic type).
- Diameter vibrating head: Ø38mm (it can be used for vibrating slabs, foundations (including mat foundations) or any other special elements.
Do not forget to check the concrete price offer!
Below you can find photos of the concrete vibrating machines that you can rent from us:
Why should we use a concrete vibrating machine?
Concrete must be poured into successive layers of 45 cm up to 65 cm and each layer must be completely vibrated before pouring the following one. This allows the air bubbles to reach the surface and not to be trapped into the layer that has not been vibrated yet. The next layer must be vibrated before the previous layer has hardened. The vibrating head must penetrate into the first layer approximately 10 cm in order to ensure a perfect fit between the two layers. The vibrating head must be introduced vertically (from top to bottom) in concrete. The surface around the vibrating head shall be compacted completely. The magnitude of the vibration effect depends on a numbers of factors such as: the size of the vibrating head, the frequency and amplitude of the vibration motion, the viscosity of the concrete, the aggregate mixture, the density and size of the steel reinforcement, the distance from the formwork (normally, a compacting effect on a diameter of 10 cm around the vibrating head can be estimated). Taking into consideration the surface of the concrete around the vibrating head, the compacted area is shaped like a circle. For a complete compaction, the vibrator shall be immersed so that the circles resulting from the compaction effect can intersect (as can be seen from the picture below):
The vibrating head shall be extracted vertically and slowly in order to let the gap formed fill slowly.
Do not pull out the vibrating head along the concrete already poured, since some of the air may remain trapped inside. Do not keep the vibrator immersed in the concrete for a too long since the components with direct effect in reducing the concrete resistance might get separated.
Choosing the concrete vibrating machine:
- the volume of the material to be vibrated and the power sources available on site shall determine the type of vibrating machine to be used.
- Portable electric vibrating machines with power supply of 230V or connected to a generator
- Pneumatic vibrators (high power ones) connected to an air compressor
- Flexible axe vibrating machine, powered by thermal engines based on gasoline or diesel
- High frequency electrical vibrating machines, connected to a converter.
The size of the vibrating heads depends on the usage. Therefore, smaller size are appropriate for smaller volumes. Larger sizes ensure increased productivity for concrete poured in large quantities. The distance between the fittings can be a restrictive factor when choosing the vibrating machine size, especially when pouring element with thick fittings (including the junction points between the horizontal and the vertical elements where the fittings are joined together).
Do not forget! By using the concrete vibrator you can reduced the water quantity added to the concrete, thus maintaining the resistance and durability of the concrete!