The new generation of Ammann pneumatic tyred rollers has been developed on the basis of the latest findings about the compaction of bituminous asphalt layers and natural soils. The modern roller design provides 1 x 1 m visibility in front and behind.
What is it?
The Ammann Pneumatic Tyred Roller (PTR) is made up of a rigid frame with a front steering isostatic axle and rear drive axle. The AP240 PTR is in fact Ammann's most popular worldwide model.
The AP240 Pneumatic Tyre Roller is flexible in its design, and provides the possibility to choose different propulsion concepts, and also to choose different emission stages for the engines. The machine can be equipped with hydrostatic (Tier3 only) or hydromechanic propulsion, and with engines in stages, Tier 3 or Tier 4i.
The rollers are intended for medium and large-sized compaction works in transport construction (roads and motorways, railways, airfields) and building construction (industrial zones, etc.).
A wide range of additional weights can be implemented to optimise the ballasting of the 4 + 4 smooth tyres. A central tyre inflation system ensures correct tyre pressure during operation.
How Does it Work?
Simply put, the pneumatic roller kneads the hot mix asphalt, working each of the oscillating tires into the asphalt mat. Not only does this achieve denser compaction, but it also drives the bigger aggregate in the mix down, and brings the fine aggregate to the top, actually sealing the asphalt better to eliminate voids and preventing water intrusion. Hence why its often described in terms of kneading dough.
Many contractors use PTR's as the kneading effect also brings the oil up to the surface. It gives it that really nice, rich, black finish, which is what many like to see.
Fields of Application