Quietly done by Ammann

Environmentally friendly asphalt-mixing plants that minimise dust, noise and odour and maximise the use of RAP will be a highlight at the SaMoTer 2020 (21-25 March) Ammann booth.
Asphalt Plants, Equipment & Applications / February 18, 2020
By Guy Woodford
Ammann - RAH60 parallel dryer

Ammann noise reduction solutions eliminate up to 25dBA, says the company. As well, bitumen fumes are reduced at points along the production process which includes bitumen tanks, skip and load-out levels and the stack. At the lower inexpensive end is the addition of cold RAP into the mixer; RAP and aggregates are dosed separately into the mixer. This process is available on new Ammann plants and as a retrofit on other manufacturers’ plants. RAP use of 25% to 40% is possible.

The addition of warm RAP via a separate RAH60 parallel dryer in combination with the cold-feed system means 60% use of hot recycled materials is possible.

For recycling rates of 100%, according to the company, warm RAP with a counterflow RAP dryer protects bitumen from damage during the heating process. The RAP is warmed so gently that there is no radiation heat making it a highly efficient system with extremely low emissions.