CEMENT & CONCRETE
WWTW integrity restored
L
ong overdue for an upgrade, Kwanobuhle’s wastewater treatment works (WWTW) is now undergoing extensive refurbishment. This will ensure sustained sanitation services for this large township, situated on the outskirts of Uitenhage, Eastern Cape. The works, which are being carried out by Ibhayi Contracting, commenced in January 2019 and are scheduled for completion in July 2020. Sika products formed a key component of the rehabilitation process. The concrete spall repairs on the plant were conducted using SikaTop Armatec-110 EpoCem reinforcing protective coating, and Sika MonoTop-615HB high build repair mortar. The latter is a repair and reprofiling mortar for structural concrete. The aerators and digesters were also lined with Sika MonoTop-612 by trowel
Kwanobuhle’s wastewater treatment works
A repaired concrete section
application to reprofile the concrete surfaces. Sikagard-720 EpoCem, a protective coating, was subsequently applied as a 2 mm thick layer to the Sika MonoTop-612. Sikagard-720 EpoCem is a thin film sealer, made from epoxy and cement-based fillers, used on vertical and horizontal surfaces. It is a unique product that provides concrete
protection and acts as a moisture barrier to allow for the rapid application of an epoxy coating on to surfaces with high moisture contents. Sikagard-63N epoxy, a highly chemicalresistant coating with a long track record in wastewater treatment plants, was applied to complete the build-up. Finally, all joints in the structures were sealed with Sikaflex Pro 3i and Sikadur Combiflex. IMIESA April 2020
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PRODUCT LINE: • Pre-bagged Concrete products (TechniMix, DryCrete) • VentaBlock (interlocking blocks) • Composite Packs (Conmixer, Blokpak Grout) • Liquid Polymer (TSL, TSL-L) • Rock support
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APPLICATIONS: • Sealing of dams, drains and sumps • Sealing sensitive rock structures • Support structures • Abrasion resistant applications
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Technicrete is a subsidiary of ISG, a leading supplier of innovative infrastructure products to the construction and mining markets in Southern Africa.
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