Asphalt concrete

Norm: HRN EN 13108-1

Road pavement structures are made of two or three layers of asphalt concrete. The specification of the asphalt concrete that is used for this mainly depends on the purpose of the road, that is, on the traffic load. Considering the sequence of installation and specific purpose, we distinguish between three types of asphalt layers: load-bearing, bonding and wearing.

The bearing layer takes over and distributes the load from the surface on the base. In addition, it is used for additional leveling of the substrate on subsequent layers. It is produced from aggregates with larger grains, such as 16, 22 and 32 mm. During installation, the thickness of this layer is usually between 5 and 13 cm.

The binding asphalt layer additionally flattens the base and takes on the load caused by the traffic load from the surface. The binding layer is produced from aggregate with a grain size of 16 and 22 mm and is usually made in a thickness between 5 and 10 cm.

The wearing asphalt layer is in direct contact with the surface load and must guarantee the mechanical stability and resistance of the wheel's contact with the ground. The thickness of this layer is the smallest, and as a rule it is between 2 and 7 cm. The wearing asphalt layer is produced from aggregates with smaller grains, i.e. sizes 4 mm, 8 mm, 11 mm and 16 mm.

 

Asphalt concrete for very thin layers - BBTM

Norm: HRN EN 13108-2

Asphalt concrete for very thin layers - BBTM (French: Beton Bitumineux Tres Mince) is a bituminous mixture in which there are aggregate particles of discontinuous composition, and it is used for the construction of wearing asphalt layers in a thickness of 2 to 3 cm. The characteristics of BBTM are increased slip resistance, i.e. better grip and reduced noise compared to classic asphalt concrete. Polymer-modified bitumen PmB 45-80/65 is used as a binder. The maximum grain size in the stone material is 8 or 11 mm.

Considering the tradition of installing this type of asphalt throughout Europe, Colas has developed 3 generations of low-noise asphalt called Microville, Rugosoft and Nanosoft. BBTM can be applied for all groups of traffic loads.

Stone Mastic Asphalt

Norm: HRN EN 13108-5

Stone Mastic Asphalt (SMA) is an asphalt mixture that is mostly used for the construction of wearing layers of pavement structures of highways and other roads intended for very heavy traffic loads and high traffic density.
Stone Mastic Asphalt (SMA) is a high-quality asphalt mixture due to its discontinuous granulometric curve, additives and increased bitumen content. As a rule, it is used for the construction of wearing layers of pavement structures of highways and other roads intended for very heavy traffic loads and high traffic density, and for the construction of protective layers of waterproofing of pavement slabs of road structures.
SMA is made from 4, 8, 11 and 16 mm aggregate grains. Polymer-modified bitumen is used as a binder.

SMA

(pdf 867.76 KB)

Porous asphalt

Norm: HRN EN 13108-7

Porous asphalt belongs to the group of wearing layers characterized by an increased proportion of voids, increased slip resistance and reduced noise. The aforementioned characteristics contribute to faster drainage, i.e. roads dry faster after rain, which affects increased traffic safety.

Porous asphalt is produced from aggregate grains of sizes 8 mm, 11 mm and 16 mm, whereby the granulometric curve is discontinuous.

Coldraine

(pdf 439.75 KB)

Rodal

(pdf 944.77 KB)