The strength characteristics of concrete directly depend on the technology of its preparation. Poor mixing, the presence of air cavities inside the volume, uneven humidification leads to premature aging and destruction of the final product. To eliminate all these shortcomings, a vibrator for concrete , which is used at the stage of pouring mortar into a mold or formwork.
Types of concrete vibrators
The principle of operation of this mechanism is to transmit vibrational vibrations to the mass of the solution. This ensures the removal of air and the homogeneity of the concrete composition. Depending on the vibration frequency, concrete vibrators are divided into:
- Low frequency. Scope of application - mixtures with a coarse aggregate fraction (50-70 mm). The oscillation frequency does not exceed 3500 per minute.
- Mid-range. It is used for solutions with an average filler fraction (10-50 mm). Oscillation frequency up to 9000 per minute.
- High frequency. They are used in fine-grained concrete mortars. The oscillation frequency can reach 9000 per minute.
It should be noted that the size of the filler fraction is rather advisory. Vibrators of different vibration frequencies can be used for compacting concrete of any brands, but this increases the time of work, which affects energy consumption and, accordingly, the cost of production.
By the type of application of impact, vibrators for concrete can be:
- Submersible. The working body with the help of a flexible hose is placed in the thickness of the concrete. It is widely used in monolithic construction with continuous construction technology.
- Outdoor. Such a vibrator is placed on the outer wall of the formwork. It is used when erecting vertical building structures with small dimensions in thickness (for example, walls).
- Surface. The working platform is located on the concrete surface. The main purpose is the production of self-leveling floors.
Summing up, it is necessary to mention the classification of vibrators for concrete depending on the type of drive, which can be electric, pneumatic, hydraulic, from an internal combustion engine, etc.
