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Facts and figures


  • Full name: Multi-functional
    light-weight WALL panel based on ADAPTive Insulation and nanomaterials
    for energy efficient buildings
  • Acronym: ADAPTIWALL
  • Duration: 48 months
  • Start date: 1 September 2013
  • Total budget: 5.05 M€
  • EC Funding: 3.35 M€

Load Bearing Lightweight Concrete

In the ADAPTIWALL project a concrete formulation has been developed to enable the making of a concrete buffer which fulfills the following requirements:       

  • Mechanical resistance   
  • Lightweight
  • Improved thermal response: good thermal conductivity and thermal mass.

The developed concrete formulation is a lightweight concrete with additives to improve the thermal conductivity and the thermal storage capacity. To validate if the he concrete formulation fulfills the requirements prototypes have been made and tested (fig 1).

 Concrete buffer prototype

Fig 1: Prototype of the concrete buffer. Left: Concrete poured into the mold. Right: Detail of the concrete with steel reinforcement.

The concrete was tested following the test setup displayed below:

Concrete test setup

The test results obtained were:

  • C20/25 Concrete
  • 1.6 LWC
  • Thermal conductivity K > 2 W/mK
  • Thermal storage capacity TES = 3 kWh/m2/ºC, with a thermal step from 20 ºC to 60 ºC (triple than the capacity of traditional concrete). This energy storage capacity makes an important delay in the heating and cooling of the Adaptiwall concrete (fig 2).

 concrete load bearing buffer 4

Fig 2: The delay in the heating of the concrete made temperature differences between hot and cold plate up to 4 times bigger than traditional concrete with a density of 2400 kg/m3.