advanced building skins 14 | 15 June 2012 - lamp.tugraz.at - Graz ...

Advanced Building Skins
Figure 7: Temperature and airflow distribution in the energy garden (winter)
5 Highly-insulating Inorganic Sandwich Construction
The monolithic design is increasingly being replaced by composite structures in which various
materials are used in different functional layers. Many clients, however, often wish to have an external
wall of purely mineral construction. Also advantages of monolithic systems such as material
compliance, ecologic compatibility of deconstruction, uniform hygric behavior and good bond of
congeneric materials often are not considered anymore.
Figure 8: Vertical building section and vertical and horizontal section of the proposed wall system
The outer massive wall construction for the Energy-Plus-Houses is supposed to be a triple layer wall
fabricated but using only concrete building materials. The inner U-shaped base course of the design
consists of 4 cm thick ultra high performance concrete, which is also the support of the ceiling. The
compressive strength of this UHPC is about 100 N/mm² (see Kuntsche [5]). The outer skin is ought to
be 2 cm thick and made of UHPC too (Figure 8). In a horizontal production mineralized protein foam
is to be inserted between the shells. With finely tuned mix between binder, protein foam and additive
could realize heat transfer values under 0.06 W / (m · K) (Gilka-Bötzow, [6]). The foam mortar has a
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