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Caustic Bund Lining, Cambridgeshire

THE PROBLEM

Following a recent overfilling incident on site it had been identified that the caustic soda bund required remediation in order to ensure full environmental compliance.

THE SOLUTION

We proposed the application of a chemical resistant yet crack bridging epoxy lining from Remmers.

Initially the existing render was hammer tested to identify hollow and debonded areas. These were removed using vibration damped breakers. All surfaces to be coated were prepared by method of vacuum controlled diamond grinding to ensure a clean and profiled surface suitable for coating application.

Defective areas of render were made good using Remmers WP Sulfatex applied as a fairing coat. This was left as a brush finish to provide an excellent mechanical profile for the subsequent epoxy bund lining to adhere to.

The loose bricks were removed and reset as part of this process also.

The cementitious materials were allowed to hydrate and the suitability for coating application with regard to substrate moisture content was tested and recorded using a Tramex moisture meter.

Prior and during bund lining application as part of our standard quality assurance the climatic conditions were tested and recorded using a Defelsko Positector Dew Point Meter.

A cove detail was installed at the floor/wall interface using a mortar made using Remmers Epoxy MT100 as the binder. This interface is the point most liable to movement in the bund structure and the installation of a cove detail serves to isolate the lining from this area. Further more spreading the point of movement over a greater length gives the bund lining greater movement potential before splitting.

All surfaces to be coated were primed using Remmers Epoxy MT100. This damp and oil tolerant epoxy primer can be applied to substrates with a moisture content of up to 6%, ensuring excellent adhesion of the new bund lining.

Caustic Bund Lining 11

Once cured Remmers Epoxy WHG was applied in two coats at a coverage rate of 0.5Kg/m2. Remmers Add Tx was added as per the manufacturers recommendations to allow greater film build to be achieved on vertical surfaces

Finally as per our standard quality assurance the new bund lining was checked for pin holing by method of spark testing. In a chemically aggressive environment such as this caustic bund a single pin hole is a point of lining failure which will allow aggressive chemicals to reach the substrate and degradation recommence.