Roads & Paving
Ammann outlines its green path forward
January 11, 2022 By Rock to Road staff
Ammann is undertaking a renewed urgency to accelerate environmentally friendly initiatives in the interest of global health.
According to the manufacturer, sustainability is the focus at Ammann today, and all days going forward.
To deliver sustainable products, Ammann is maximizing safe and sustainable manufacturing practices while building green plants and machines. The company is also partnering with eco-focused packagers and transport services, while expanding the use of alternative, eco-friendly fuels.
Utilizing advanced technology to help plants and machines operate efficiently will also play a role, to minimizing fuel burn and emissions.
The company also develops asphalt-mixing plants that maximize the use of recycled materials and will provide plants and machines that reduce emissions beyond the stated requirements.
Zero waste system
With continuous asphalt-mixing plants, the first and last few tonnes of every shift are waste. As a remedy, Ammann has developed a patented solution that ensures all mix has the proper percentage of larger aggregates and fines from the very start to the very end. The solution is able to prevent up to 5 tonnes of mix per plant per shift from going into the scrap pile.
The company has also developed a carbon-neutral burner. The system utilizes a special asphalt-mixing plant burner that transforms wood dust into a renewable fuel.
The carbon dioxide released when burning wood is offset by the fact the tree consumed that amount of carbon dioxide during its life. Therefore, the emissions are carbon neutral.
The RAH100 counterflow dryer enables new asphalt mix to be made with up to 100 per cent recycled asphalt. Essential to the RAH100 is its gentle heating process. Recycled asphalt must reach its target temperature, but the valuable bitumen will be damaged if the material is heated too quickly.
The RAH100 eliminates that concern. It consists of two connected sections. One is a hot gas generator that contains a burner and forces air toward the second section, which is a counterflow dryer.
The recycled asphalt enters at the far end of the counterflow dryer section and moves toward the heat chamber. At the end of the counterflow dryer, recycled asphalt is transported to an accompanying silo.
The heated recycled asphalt mix leaves the dryer before the temperature becomes excessive, so it never reaches the critical temperature where the bitumen is damaged.
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