A foam bitumen module enables a reduction in temperature
The foam bitumen is produced in a pressurized chamber that is integrated into the mixer and connected to the conventional bitumen supply system. A small quantity of water and air is then injected at high pressure into the normal bitumen, which is held at a temperature of 175°C. The surface area of the bitumen rapidly expands by a factor of 20 and the resultant foamed material is then added into the mixer, where it is mixed with mineral. Due to its large surface structure, the foam bitumen permanently coats the mineral, lending it the required durability, while the water contained in it evaporates. One of the characteristics of low-temperature asphalt is its lower viscosity, which makes it temporarily easier to process.