The equipment, valued at R4-million, is used to recycle road millings and waste material.
Much Asphalt technical manager Brian Neville says the impact crusher and mobile screen, supplied by Pilot Crushtec, have been put to work on a 300 000 t stockpile of reclaimed asphalt from various sites, including the South African National Roads Agency Limited’s Gauteng Freeway Improvement Project.
“We achieve about a 95% yield of recycled material from the stockpile and 20% of this is in the asphalt mixes, saving on the costs of raw materials and energy costs, while reducing the pressure on natural resources and our carbon footprint. “Even taxpayers benefit, as they ulti- mately pay for the construction of roads,” he says.
Added benefits of recycling include an enhanced ability to produce warm mix asphalt using a foaming technology, which allows for higher percentages of recycled material than traditional hot mix asphalt. Also, warm mix asphalt allows for lower mixing and laying temperatures, resulting not only in reduced consumption of fossil fuels but also in lower levels of carbon dioxide and harmful vapours being released.
“The crushing and screening machines run between five and six hours a day, producing about 90 t of recycled asphalt an hour,” says Neville.
Much Asphalt started recycling road material in 2007 at its Roodepoort plant, which is capable of screening material at a rate of 250 t an hour into two graded frac- tions and one oversize material.
“Our future endeavour is to have a recycling capability at all of our 16 plants countrywide,” concludes Neville.
Edited by: Martin Zhuwakinyu
Source- Engineering News