Foamed concrete slabs and screeds

Using foam concrete for light weight, floors, slabs and screeds

Propump engineering have designed and tested many mixes that allow various densities of foamed concrete to be produced with relative ease from any ready mix batching plant. These mixes are formulated to provide characteristics such as good pump ability, flow and strength.

The addition of air and water to any cementitious volume exponentially reduces the compressive strength, as such a typical foamed concrete will have a strength range from .75N/mm2 to around 8 –   10N/mm2 before the pump-able distance or the length of workability becomes an issue.

Screeds can, and have been produced using foamed, light weight concrete. They are usually specified to reduce the static load on a given structure, or to allow for easy excavation given the materials inherent stability. In some cases a denser, heavier foamed concrete has also been specified.

Propump recommend that a foamed concrete screed or slab would need to be a minimum of 150mm thick, a lot thicker than some other screed applications. A typical foamed concrete screed would be around 500 kg/m3 in density. For 1 cubic metre of foamed concrete this means that 75% of the volume would be comprised of Foam.

Royal School Bath 

Material: 500 KG/m3 Foamed concrete.
Pumped over 150 metres with 2.5” line 150mm slab thickness, poured in 2 phases.

Hangar Lane Housing Developments

Material: 500 KG/m3 Foamed concrete.
Pumped over 100 metres with 3” line 500mm slab thickness, poured in 2 phases.
Across 14 separate bays, each pour volume was approximately 50m3.

Whilst Foamed concrete can be described as self-levelling, it is not as fluid as water, if tight tolerances are required, the material can be floated, minimum time must be spent in the pour to reduce the impact on the air structure of the foamed concrete. Propump do not currently provide a service to level material to your requirements, however we will endeavour to work with you to achieve any results you wish.