Modern Mining September 2019

content and additives. Sasobit was added to make the mix workable after a four-hour journey from the asphalt plant in Polokwane to the site. The mix had to be capable of 98 % compaction as opposed to the normal 93 %. The site trials followed, with 200/300 tonnes placed and samples collected for Marshall testing on voids, compaction tests, and Marvil permeability testing. The total quantities for the project equate

surfacing contractors, was sub-contracted by SS/ CivEng GG6 JV for placement of the 13 mm SAMI layer and the voidless asphalt. Trial project Due to the unique nature of the solution, the first stockpile area, completed in May 2019, was regarded as a trial project. A trial mix was designed experimenting with different asphalt gradings, binder

Above: Construction of the 13 mm SAMI layer. Left: The Grootegeluk coal stockyard area with work on the impermeable pavement in progress. Below: BSM layer being placed with Wirtgen WR200 recycler and tanker.

September 2019  MODERN MINING  27