The Impala Platinum slag granulation cooling tower in Rustenburg had several flaws that were causing cracks and severe water leakage. Because of the nature of this process, the reservoir could not be emptied. This repair process would not only stagnate their smelting process but would also incur enormous labour and operational costs. Therefore, repairs would have to be done from the negative side.
Impala had numerous contractors conduct a test panel on the negative side of the structure to see if their solution would work for this extremely deep reservoir structure 60m (20ft). Kryton was the only waterproofing solution that successfully passed the test panel. Kryton’s authorized distributors in South Africa, Sanika Waterproofing Specialists were awarded the contract to repair and waterproof this structure using Kryton’s Leak Repair System.
To prepare the surface for crack repair and waterproofing, Sanika Waterproofing Specialists first removed the surface applied membranes which had been unsuccessful in preventing concrete deterioration. Once the surface was clean, they acted quickly since the temperature of the water was over 80 C° (176 F°). The Krystol Leak Repair was employed to successfully repair and waterproof the reservoir: first, Krystol Plug™, a rapid-setting hydraulic cement product, was used to stop water penetration, following which Krystol Repair Grout™, which is used to resurface defective or deteriorating concrete, was used to stop the concrete from cracking. Lastly, Krystol T1® was used on the surface to transform concrete into a waterproof barrier.
Impala was extremely pleased with the work and said, ” Sanika Waterproofing Specialists performed the work in an exemplary manner with due respect to all the safety, environment and quality. They execued the repair within budget, on time, and with a very high standard of quality.” Subsequent inspections conducted by independent consulting engineers appointed by Impala determined that the Kryton solution would provide superior quality to the mine in the long run.
As part of the Krystol Leak Repair System, Krystol Repair Grout is a crystalline concrete waterproofing product that stops the flow of water to permanently repair leaking cracks, holes and joints in concrete, and can also be used to resurface and waterproof defective, damaged or deteriorating concrete. The grout employs advanced fiber technology and shrinkage controlling additives to prevent cracking.