Through its pioneering spirit and sustainable approach, leading asphalt supplier National Asphalt continues its drive towards minimising the carbon footprint of the roadbuilding industry.
With its Head Office situated in Bon Accord in Pretoria North, National Asphalt has a footprint that extends across much of South Africa and beyond. As a member of the Raubex Group of companies, National Asphalt has been spearheading industry firsts for almost 30 years and has seen significant growth in both its footprint and capacity, particularly over the last decade.
A key enabler of growth for the company has been its approach to introducing innovative and class-leading solutions and products to the South African market. As the leading supplier of asphalt in the country, National Asphalt has made significant advances in the supply of reclaimed asphalt (RA).
RA is sourced by reclaiming the existing asphalt pavement by milling this out, then crushing and screening it and introducing a percentage of this reclaimed material back into the mixes used to rehabilitate or rebuild the road network. Sustainability lies at the very heart of RA, as its use requires the utilisation of far less virgin asphalt materials than a conventional mix. Beyond this, it also provides financial benefits throughout the value chain – reducing the costs of everything from quarrying to transportation.
South Africa’s widespread bitumen shortage in 2015 provided a challenging environment for the roadbuilding industry, and it is expected that this year will again see pressure placed on the bitumen supply with the scheduled refinery shut-down maintenance programmes during the year. In conjunction with this, the availability of quality aggregate used in the manufacture of asphalt is under pressure. The use and introduction of RA into the mixes is one of the ways in which these pressures may be eased. As a result, it is clear that those minimising the use of virgin materials will be leading the way forward. Government projects, through bodies such as SANRAL, are also increasingly demanding the use of 40% RA mixes in road rehabilitation projects, which puts a company like National Asphalt at a distinct advantage considering its impressive RA capabilities. The company has a number of static and mobile asphalt plants situated across the country, with its flagship operation sited at its home base in Bon Accord, in the City of Tshwane.
In 2016, this Tshwane-based facility was upgraded from an 80 tonne/hour to a 100 tonne/hour plant, with RA capacity. In conjunction with the upgrade, the plant’s wet scrubber was removed and replaced with a bag house, bringing National Asphalt in line with the increasingly stringent environmental specifications outlined by the Department of Environmental Affairs.
Augmenting these already impressive static plant capabilities is the company’s innovative use of mobile RA plants, enabling the production of RA as close to a site as possible. National Asphalt’s range of mobile plants offers outputs of between 80 tonnes/hour to 120 tonnes/hour and the company can produce in excess of 2 million tonnes of asphalt per annum.
While 40% RA is considered a desirable specification, National Asphalt constantly pushes the envelope one step further. It is at the forefront of roadbuilding R&D and constantly trials new products to determine their suitability in South African conditions. A most impressive recent product testing has revealed the potential – through using specialty admixtures – to make use of 100% RA in road surfacing.
The ability to truly close the loop, by embracing a circular production process and using 100% RA, is an important step on the path to minimising the carbon footprint of the industry and embodying sustainability.
47 Graf Street, Bon Accord, Pretoria
PO Box 247, Bon Accord, 0009
+27 (0) 12 562 9500
+27 (0) 82 925 0241/2/3
+27 (0) 12 562 9600
Building No 1, Highgrove Office Park
50 Tegel Avenue, Highveld, Centurion
+27 (0) 861 466 656
+27 (0) 86 573 9926
Lot AE 6616, Cliffdale. Kwazulu Natal
PO Box 1657, Hillcrest, 3650
+27 (0) 31 736 2146
+27 (0) 82 333 3514
+27 (0) 31 736 1938
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