An asphalt road paving consists of a combination of aggregates of different size and bitumen. They are produced in special plants by mixing the ingredients at a temperature of 160-180°C. They are then transported to the place of laying and applied by means of paver machines and compactor rollers at temperatures greater than or equal to 140°C.
The term Warm Mix Asphalt refers to asphalt produced, laid and compacted at temperatures 30-50°C lower than those traditionally used. This brings multiple advantages: the asphalt is more workable and easier to compact, while at the same time reducing energy consumption and greenhouse gas emissions.
Bitumen emulsions are widely used for both construction and maintenance of road pavements. They are used as a "tack coat" of asphalt layers, but especially to produce "cold asphalts" such as surface treatments and 100% "Reclaimed Asphalt" recycling.