The quality of sand significantly affects the performance of concrete and with the worldwide scarcity of clean washed filler sand from traditional sources, like river beds, is a growing concern to South African Concrete manufacturers.
Natural sand production is a slow process so it’s not surprising that sand is often harvested at a faster pace than it’s replenished. Sand is cheap to mine, but its weight and bulk make it extremely expensive to transport. The shortage of good quality sand has been driving up the price and forcing manufacturers to often make the best of lower quality material. Projects in remote areas often compel contractors to make use of local materials for their concrete.
The General Manager of CHRYSO South Africa, Hannes Engelbrecht explains that the real challenge is to ensure that the concrete produced is of consistently high quality and that it matches the technical specifications needed for the project. “We are in an ideal position to assist customers who are faced with this challenge as CHRYSO’s high technology admixture solutions to address the four key parameters of sand, namely: clay content, fines, absorption and particle shape,” he says.
CHRYSO®Quad 20 range allows customers to manufacture cost optimised concrete, which meets the demanding criteria. Incorporating CHRYSO’s breakthrough ‘clear’ polymer technology, the range meets the challenges presented by crushed sand including a high clay content and excessive fines. DOWNLOAD THE INFO
A good example of this technology is at the Gouda wind farm in the remote part of the Eastern Cape. Logistics and the prohibitive cost of transportation was a major concern in installing the precast concrete towers. Material from local sources had to be used for the precast elements, which were cast on site. CHRYSO provided the solutions to meet the exacting specifications, which included contributing other admixtures to deal with frequent high ambient temperatures.