Construction World October 2015

MAIN PHOTO: Fine RA feeding from the screening plant at Much Asphalt Benoni.

LEFT: Unprocessed RA.

BOTTOM RIGHT: Much Asphalt’s new mobile plant produces asphalt containing 40% RA on a SANRAL contract near Bloemfontein.

Much Asphalt started recycling road material in 2007 and the benefits were immediate when a runway rehabilitation contract at OR Tambo International Airport called for 10% recycled material to be included in the bitumen treated base course. This required Much Asphalt Benoni to screen more than 8 000 tonnes of recycled material alone. In 2011 the Benoni branch commissioned a new impact crusher and a mobile screen, which run between five and six hours a day to ensure a consistent 300 000 tonne stockpile of reclaimed asphalt for recycling. A Finlay 649 triple deck screen was added to this f leet in 2015. In 2013 Much Asphalt set a new benchmark when it produced a trial mix for use at OR Tambo International Airport containing the highest known proportion of recycled material in a warm mix asphalt product in South Africa. The mix, manufactured using the company’s warm mix asphalt plant in Benoni, involved 500 tonnes of bitumen treated base containing 55% RA. The trial mix was successfully paved at the OR Tambo cargo area, resulting in an order for an additional 2 000 tonnes. ∞

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