The Bretonterastone® Blocks plants produce large-sized blocks which are made by combining and compacting the materials using a “vibration vacuum process“.
The stone mix consists of stone aggregates, fine mineral particles and inorganic or organic based bonding agents. Blocks measure 308 x 125 x 75 cm and are then sawn into slabs measuring 308x125 cm with a finished thickness ranging from 9 mm (15 mm if an inorganic resin is used for bonding) to 30 mm or over.
These blocks and slabs can be sold as they are or the slabs can be transformed into finished products to the size required.
The stone materials constitute up to 94% (78% if an inorganic resin is used) of the weight of the finished product and are calcareous (marble, limestone, dolomite etc.)
and can have sizes up to a maximum of 60-90 mm.
The type of bonding agent can be:
- Portland cement mix (“hydraulic” inorganic agent), generally Class I mixed with water to a water / cement ratio usually not higher than 0.30 and compounded with normal fluidifying agents used in the concrete industry.
- Unsaturated polyester resin (organic bonding agent) compounded with additives to enhance adhesiveness.
With Bretonterastone® plants, and when using Portland cement as bonding agent, it is now possible to produce “P.M.C.” (“Polymer Modified Concrete”) products by simply adding to the concrete mix common polymers such as resins or polymeric latex (for example acrylic latex) enhancing the technical properties and features of the finished product. The production rate, depending on the plant model and layout, varies from 1,500 square metres up to 3,000 square meters per working day.