ASPHALT FOR SPECIAL CONSTRUCTION METHODS:

VIBRO ASPHALT(ROLLED POURED MASTIC ASPHALT)

The mixture consists of approx.60% chipping,10% filler, equal proportion of crushed and natural sand as well as approx.6.4% binder B45. It is mixed at a temperature of approx.230c and transported with insulated special trucks. During laying with a paver the mixture is liquefied and compacted by vibration and chippings are subsequently spread over this poured mastic asphalt like surface and rolled in.

DRAINAGE ASPHALT(POROUS ASPHALT)

The mixture for drainage asphalt surface courses is combined of a high quantity of chippings with a highly resistant binder and mortar. It is then applied as a surface course on a dense substrate or an additional waterproofing layer. This type of asphalt is characterised by a higher content of air voids which enhances the drainage between the surface of  the carriageway and the vehicle tires.It also  changes the thermal conductivity and low temperature performance.

COLD LAYING IN THIN LAYERS:

Cold mixer asphalt consisting of mineral aggregates 0/3 to 0/8mm, water, polymer modified cationic bitumen emulsion and additives is mixed and placed with a laying weight of 10 to 30 kg/m cube (dry mass), using special self-propelled mixing and paving equipment. The necessary bonding between the layers requires an absolutely clean substrate.

HOT LAYING IN THIN LAYERS:

Hot placed thin layers consist of asphalt concrete, stone mastic asphalt or gussasphalt and are applied with a laying weight of 30 to 50 kg/m cube, depending on load and condition of substrate

ASPHALT VENEER COATS:

Asphalt veneer coats are placed on surface courses in order to seal these surface or enhance their grip.They are applied as so-called surface treatment or in form thin layers by cold laying. This treatment is applied as protection against moisture, mainly on low volume traffic areas(construction classes iv to vi), as well as for sidewalks and yards, but not as an independent surface course.

               For the surface treatment the substrate or the previously spread chipping are sprayed with bituminous binder agent and subsequently gritted once or twice with raw or coated chippings. Cold placed thin layers are mixtures consisting of mineral aggregates(high-grade chippings,high-grade crushed sand and reclaimed filler), polymer modified cationic bitumen emulsion, additives and water.