In preparation for a major upgrade, the Fish Water Flats Waste Water Treatment Works (WWTW) in Port Elizabeth was refurbished with the use of a wide range of Sika products used to repair concrete, protect the reinforcing steel and for waterproofing. Sika’s Concrete Repair and Protection System was chosen for the refurbishment of the Fish Water Flats Waste Water Treatment Works (WWTW) in Port Elizabeth, following serious concrete deterioration.
Phase 1: Concrete repair
Firstly, Sikagrout-212 was used to repair the screeds in the digesters, after which SikaTop Armatec-110 EpoCem was applied as a bonding primer and reinforcement corrosion protection for all exposed reinforcement. As a high-strength repair and reprofiling system, Sika MonoTop-612 was put on all spalled areas. Finally, Sikagard-720 EpoCem, a micro mortar that is impervious to liquids and water vapour permeable, was used for pore sealing, levelling and finishing of the concrete surfaces.
Phase 2: Protection
The surface of the reinforcing steel received a protective monomolecular layer of Sika FerroGard-903 Plus, followed by Sikagard-705 L, which serves as a reactive impregnation to reduce capillary water absorption and protection against driving rain and splashing on the vertical concrete surfaces. The third product used in this phase was Sikagard-550 W Elastic, a plasto-elastic protective coating with excellent crack-bridging properties.
Phase 3: Waterproofing
The waterproofing phase involved the Sikadur-Combiflex SG System comprising a flexible Polyolefin (FPO) waterproofing tape and Sikadur-31 DW, a thixotropic adhesive based on epoxy resins and special fillers. Adhesion between the tape and adhesive requires no on-site activation. By using various Sikadur epoxy adhesives, the system becomes extremely versatile, suitable for many difficult situations.
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Sika MonoTop-612, a high-strength repair and reprofiling system, was used for general spall repairs to structures.