At Graus Terrazos y Pavimentos, as one of the leading companies in the paving industry and with its extensive experience, we want to familiarise you with our production process.


Achieving the highest quality in our products is one of our main goals; we individually study the needs of each customer.

Processes

Terrazzo is a product that is essentially made of cement, aggregate and water, divided into two layers: the face side and the base. First of all, it undergoes a vibration process, and is then subjected to pressure of more than 150 atmospheres. This results in high-performance pieces for both indoor and outdoor flooring. The selection of components, aggregate size, pigments and mixing ratios is very important when manufacturing terrazzo, and automated lines are used from the start until the completion and finishing of the final product.


Production processes

Flooring tiles are produced in rotary presses with mobile bases, into which we insert the moulds that define the shape, cross-sections and different textures that yield the corresponding product families.


FACE SIDE

This is the good side: that is, the side you see and walk on, and it is the first side to be manufactured. It is made out of grey or white cement, water, marble dust, fine sand, crushed stone, pigments or dyes and additives, all depending on the purpose, look and performance required for each piece. This mixture is poured into the mould and spread out using vibration to achieve:


Uniform layer thickness
Expulsion of air bubbles
Even distribution of components

REVERSE SIDE

The reverse side supports the face side, with a rough finish to facilitate adhesion to the mortar that holds the tile down. To bond the two layers, we must ensure that this material is fairly dry, since the excess water from the good side must be absorbed in the process of pressing and curing. The composition, thickness and materials used in the two layers must meet the requirements set forth in regulations and the requirements for its intended use after completion.


PRESSING

Once two layers have been spread out, an initial pressing is made to optimise the production cycle. Then, the mixture is fully compressed. This compression yields a highly compact and strong tile, while at the same time allowing it to be released from the mould and handled, and excess water to be absorbed.


UNMOULDING AND DRYING

The mechanical parts are removed from the mould through a suction system, and then the tiles are arranged in trays and placed in a suitable location for the material to set up. When they are ready to be handled, the finishing and storage process begins.


These machines and processes are used to manufacture both indoor and outdoor tiles, paving tiles and floor tiles.


Finishing processes

POLISHED

This treatment lends a smooth, fine face side to the tile, leaving the colours and bits of aggregate on the surface that give the right look to the final product. It is created by passing the tiles through machines with abrasive heads that polish the piece gradually. For indoor tiles, the tile is finished by polishing on site, which simultaneously removes grout from the surface and corrects imperfections in the colouring. Last of all, the material receives a buffing treatment.


SHOT-BLASTING

This type of face finish is created by special machines. The process involves subjecting the face side of the piece to a heavy impact of steel balls that are projected using turbines and nozzles. Depending on the intensity of the process, the tile's texture will be more or less rough and slip-resistant.


ACID-WASHING

The face side, usually formed using aggregate with average particle size and rounded edges, is manufactured using the effects of a retarder that, after at 24 hours, allows the mortar on the surface to be reduced using a pressure washer, giving the piece a special look.


OTHER FINISHES

Surface finishes can be combined together to extend the range of face designs (polished, shot-blasted, textured, etc.)

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