OM0006 Conder ASP HDPE Rev 5.2
66
Concrete Specification
The specification for the concrete mix to surround the tank should be selected
by the tank installer considering the site conditions and application
requirements.
For a typical non-structural application in good ground conditions, with non-
aggressive soils, a concrete with a 28-day compressive strength of 20 to
30N/mm2 with a 25 to 50mm slump, complying with the relevant BS EN, is
generally suitable. For non-typical applications, aggressive soils or structural
applications specialist advice should be obtained.
Lift height (rate of rise)
Determine the lift height (m), or rate of rise (m/h) for the specific concrete type
used, to ensure that a design pressure (P max) of 15kN/m2 on the tank
IS NOT
exceeded.
Vibration
The design of the tank assumes minimal compaction of the surrounding
concrete. Where necessary, this may be extended to include light internal
vibration. Do not use deep re-vibration which will substantially increase the
pressure on the tank, possibly causing failure.
Impact of Concrete on Discharge
The effects of concrete discharge impact are considerable. These effects must
be considered to ensure the maximum pressure of 15kN/m2 on the tank is not
exceeded.
UNDER NO CIRCUMSTANCES
should concrete be discharged
directly onto the tank.
Live Load
If the tank is installed in an area where traffic, or other superimposed loadings
can be applied, a structural engineer should be consulted, to design a reinforced
concrete slab spanning over the tank. This is to prevent the load being
transmitted to the tank (or its concrete surround). If this slab is constructed
immediately above the tank, it should be separated from the concrete
surrounding the tank by compressible material.
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