The single panel is used as bearing elements as we apply a structural plaster (shotcrete) on the worksite to both sides of the panel. The standard shotcrete thickness is about 3 cm. This will form a sandwich panel of reinforced concrete with expanded polystyrene core. The structural plaster will use mixed treated sand with granulometry from 0 to 5mm and actual strength of at least 200 ÷ 250 dan/cm2.
The plaster should have a plastic consistency s2 (measured settlement with Abrams cone less than 5cm).
For standard dosage in one cubic meter of Mass, The Indicative Quantity of each Material should be:

• Concerte 350 Kg
• Sand with Mixed granulometry 1600 Kg
• Water 160 L

The quantity of water may be different according to the natural sand humidity.
The following parameter that should be constant:
A/C ~ 0,52
I/C ~ 4,5
The sand quality should be without clay or any organic substances and totally washed.
Any problems of workability must be solved without adding water, and using fluidizing additives dosed according to the manufacturer’s specifications.
The retraction cracks formation can be avoided by adding polypropylene fibers into the mix (one kg per m3).