Aerial hopper

Aerial concrete transport system between two points, from the plant to the precast machine or unloading point.

Hoppers

What is it?
  • The aerial hopper is a concrete transport system between two points.
Utility
  • The aerial hopper mainly serves to transport the mixture to the block machine.
  • It is recommended when the distance between the concrete plant and the discharge point is far.
  • It is also a cleaner and faster system than a conveyor belt.
Concrete precast pieces
  • The selection of aggregates is of great importance to achieve a good quality of the final products.
  • The objective of the manufacturer of concrete precast products is to achieve a piece of the mechanical properties required by the international standards with the least amount of cement.
  • The hoppers that store the aggregates have to be covered so that if it rains the water does not seep and the degree of humidity of the mixture does not vary.
  • The most important thing is the quantity of water, as it completely modifies the aggregate, and therefore also the performance of the production machine, both in the filling of the mould and in the compression of the part.

Aggregates

Aggregates

The selection of aggregates has a great importance to achieve a good quality of the final products. The objective of the manufacturer of concrete precast products is to achieve a piece of the mechanical properties required by the international standards with the least amount of cement.

The mixture has to be as homogeneous as possible, to achieve it we have to make a good dosage of aggregates and cement.

The most important thing is the quantity of water, as it completely modifies the aggregate, and therefore also the performance of the production machine, both in the filling of the mould and in the compression of the part.

Characteristics of the aggregates

The main characteristics of aggregates are:
• Hardness
• Weight
• Finishing
• Dimensions

These properties will be achieved if we choose good aggregates, and a good dosage between them.

The weight of the piece should normally be the minimum, to facilitate road transport and installation on site.

Dosage of the aggregates

The dosage of aggregates can be in two ways:
By weight: we weigh the desired amount of aggregates.
By volume: a much simpler system, we regulate the feeding time of each aggregate.

For a good dosage we will need three hoppers with aggregates of different granulometry although the minimum advisable are two hoppers.
The variation of the aggregate moisture content, can be an inconvenience because the unit weight varies so we must prevent this from happening.

Classification of the aggregates

The classification of aggregates by granulometry is as follows:

Fine Aggregates: Grain dimensions less than 0,1 mm.
Sands: Grain dimensions between 0,1 and 5 mm.
Gravel: Grain dimensions of the grains between 5 mm and 8 mm.

The aggregates cannot be larger than a third of the thickness of the walls.

Recommended mixture to obtain a good aggregate

A recommended mixture to achieve a balance among all properties would be:

•    45 % of medium-sized aggregate
•    40 % of thick aggregate
•    15 % of fine aggregate


The powder is necessary in the dosage of the aggregates to help the cement form a paste that perfectly mix all the grains. If there is no dust at all, we will have to increase the quantity of cement and water, but on the contrary, if the dust were very large we would not be able to make a resistant piece.
The quantity of powder should not exceed a weight of 5 % regarding the total quantity of the aggregates.

What we can produce

Are you interested in this kind of product?

Please contact our sales team, they can answer any questions about this or other installations.

  • Manufactured aggregates with which you can manufacture slabs, fences and channels of different types and with different techniques for the creation of concrete.
  • The drying of the pieces can become as important as their manufacture, therefore, we believe that it is essential that you have a drying area for the concrete pieces in your factory
  • In this part, we will talk about the importance of humification after drying 24 hours before palletizing.
  • In this part, we offer the reasons why we believe you need a laboratory (forlab) from Rometa in your factory, advising them on what and how to do it
    Quality
    ROMETA incorporates components from leading brands known worldwide in electrical and hydraulic equipment.
    Our company is certified in accordance to standard UNE-EN ISO 9001:2015 and our facilities meet the safety requirements of European Directive EEC 2006/42 / C.

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