THE PROBLEM
As part of the new build development a lining was required for the concrete wet riser tanks to ensure that they were fluid tight.
Concrete Wet Riser Tank Lining London
THE SOLUTION
We proposed a proven tank lining that we have used to line numerous sprinkler and wet riser tanks in the form of Remmers Epoxy WHG. This crack bridging epoxy tank lining is particularly suitable for this application.
Initially all surfaces to be coated were prepared by vacuum controlled diamond grinding to remove surface laitance and contaminants. Laitance forms where water is forced from the concrete mix, creating a weak poorly bonded surface layer – particularly at the top and against mould faces. By using diamond tools to remove to remove this poorly bonded layer it ensures that the new tank lining will be properly adhered.
Following preparation a cementitious fairing was applied to fill blow holes in the concrete. This must be filled prior to the application of the epoxy tank lining materials as these cannot be filled with coatings alone.
Cementitious materials must be allowed to naturally hydrate before tank lining materials can be applied. This proper hydration was confirmed by moisture testing as part of our standard quality assurance.
Dehumidification was introduced to ensure the correct climatic conditions for coating application, which were tested and record as part of our quality assurance process. Applying tank linings in line with the climatic conditions recommended by coatings manufacturers is key to ensuring proper adhesion and performance of the tank lining.
A cove detail was installed at the floor/wall intersection as an additional sealing detail to further spread the point of potential movement and create a multiplying effect for the crack bridging properties of the tank lining.
All surfaces to be coated were primed using Remmers Epoxy MT100 damp tolerant epoxy primer to gain a high strength bond to the concrete tank and provide an excellent foundation for the tank lining system.
Remmers Epoxy WHG was then applied with 5% added thixotrope as per the manufacturers recommendations. This was applied in two coats at a practical coverage rate of 0.5Kg/m2 per coat. The thickness of this was tested using wet film thickness combs as part of our standard quality assurance.
The tank lining was checked for porosity using a DC holiday spark tester in order to ensure a pin hole and this leak free tank lining.
