Ein multifunktionales und energetisch aktives Fassadenelement aus Beton

An energy-active façade element from mineralized foam (MF) and micro-reinforced ultra-high-performance concrete (mrUHPC)

Today, an increase of the energy efficiency in the industry is typically achieved by separate, parallel measures, primarily on the level of the individual machines. Energy efficiency can be improved by a holistic, integrated approach, which links the machines, the production process, the technical infrastructure and the building and its envelope.
The subject of this paper is the current development of a new prefabricated element for façades and roofs, which is being developed in the context of a research project called "&eegr;-Fabrik" (i. e. energy-efficient factory, www.eta-fabrik.de) at TU Darmstadt, Germany. The project started in summer 2013 and is supported by the German ministry of economy and energy (BMWi) for a duration of four years. This paper summarizes the concept design; ongoing mechanical and physical tests and a mock-up prove its feasibility. The element consists of purely mineral materials (concrete) and can be energetically activated by capillary tubes integrated in the surface layer. The outer layer consists of a micro-reinforced ultra-high-performance concrete (mrUHPC) to achieve a low component thickness due to its high mechanical capacity, resistance against thermal changes, surface quality and low permeability. The core of the element is responsible for insulation. For this, a mineralized protein foam (MF) is used. It provides good thermal insulation properties due to its low density allowing low heat transfer coefficients. The inner part consists of conventional reinforced concrete with capillary tubes integrated in the surface. The final façade element thus combines limiting, bearing, insulating and thermal activation using concrete.