Panel Elements

The main components developed and their materials are shown in the following illustration.

Panel production

Elements were produced by one industrial consortium partner in one facility in Sweden. Elements consisted of sandwich and half panels for testing and for the mock-ups.

The general properties of SESBE sandwich panels are outlined as following:

  • Total weight for a 200 mm thick panel 140 kg/m2
  • Total weight for a 250 mm thick panel 146 kg/m2
  • U-value for a 200 mm thick panel* 19 W/(m2×K)
  • U-value for a 250 mm thick panel* 15 W/(m2×K)

For comparison: A 250 mm thick sandwich element with standard concrete (RC), mineral wool (MW) insulation (lamda = 38 mW/(m×K)) or EPS (lamda = 34 mW/(m×K)):

  • Total weight (MW-Insulation) 389 kg/m2
  • U-value (MW-Insulation)* 38 W/(m2×K)
  • Total weight (EPS) 387 kg/m2
  • U-value (EPS)* 36 W/(m2×K)

*Theoretical U-values of one panel without opening and joints.

Reduction towards standard concrete panel (non-load bearing) with the same thickness as the new SESBE panel = 250 mm:

  • Mass 62-63 %
  • U-value 58-62 %

Half panels have the following properties:

  • Total weight for a 175 mm thick panel 80 kg/m2
  • Total weight for a 225 mm thick panel 86 kg/m2
  • U-values the same as for the sandwich elements for the two thicknesses.

Sandwich panels are casted layer by layer in a large form work system as illustrated below

To connect the layers within the panels connectors were developed, which are based on glass fiber reinforced polymer (GFRP). The connectors can be used singular or in double configuration.

For both types of panels, concepts for anchoring them to the load bearing frame of the building (floor slabs) were developed. This included two anchorage alternatives for sandwich panels and one concept for half panels.