EXPANDED CLAY AGGREGATE (CH) Aggregate size 0 to 30 mm

Expanded clay is a ceramic lightweight aggregate manufactured from the primary raw material clay. The clay, mixed with an organic additive, is first dried and subsequently expanded up to 4–5 times its original volume in rotary kilns at temperatures of approximately 1200°C. The resulting expanded clay granules are then sieved and crushed into different particle size distributions for commercialization in loose or bagged form.

Each granule consists of a hard ceramic outer shell enclosing a porous honeycomb-like core. Expanded clay aggregates are characterized by low density and relatively high compressive strength.

Expanded clay aggregates are classified into:

• standard tout-venant, with a particle size range from 0 to 30 mm and a bulk density ranging from 330 to 560 kg/m³; and 

• structural tout-venant, with a particle size range from 0 to 16 mm and a bulk density ranging from 620 to 720 kg/m³. 

Structural tout-venant is characterized by a lower degree of expansion and higher compressive strength compared to standard tout-venant.

This Environmental Product Declaration refers exclusively to the production of standard tout-venant expanded clay, in both loose and bagged forms. Depending on the particle size distribution, the bulk density of the loose aggregate, determined in accordance with UNI EN 1097-3, ranges from 330 to 560 kg/m³.