C³Basisvorhaben 4

Multifunctional Elements from Carbon Concrete

Visionimage Carbon Concrete Bridge
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Vision of a bridge from Carbon Concrete with functions integrated
CGI: A. Heller / S. Huth, ai:L der HTWK Leipzig

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B4 Demonstratoren
CB4-Demonstratoren | Collage: J. Reise, ai:L - HTWK Leipzig

Textile reinforced concrete is a new composite material consisting of a textile reinforcement made of carbon or alkali resistant glass and a mineral concrete matrix. Since the reinforcing materials do not corrode, a massive concrete coverings as it is needed with steel reinforced concrete is not necessary. Concrete components can thus be made much slimmer and lighter. Textile-reinforced concrete is currently used In the reinforcement of bridge structures, ceilings, shell constructions and facade elements. The ai:L worked in 7 out of 8 parallel subprojects: 

  • C³INFRALIGHT: Funktional geschichtete Gebäudehüllen aus Infraleichtbeton 
  • C³SANDWICH: Gedämmte dreidimensional geformte Sandwichelemente aus Carbonbeton 
  • C³PV: Integration von Photovoltaik in Carbonbeton-Bauteile 
  • C³SUPERCON: Direktelektrische Energiespeicher als Teil der Carbonbeton-Gebäudehülle 
  • C³DAYLIGHT: Transluzente gedämmte Carbonbeton-Gebäudehüllen 
  • C³LED: Integration von Leuchtdioden in Carbonbeton-Bauteile 
  • C³SENSE: Integration von Sensoren in Carbonbeton-Bauteile 
  • C³LINK: Synergetische Vernetzung

In the C³ base project 4, the potentials of carbon-reinforced concrete (carbon concrete) as a multifunctional building envelope should be investigated. The aim was to integrate the building functions into the carbon concrete, thus creating multifunctional components that permit to reduce the building infrastructure and thus the use of resources for the con-struction and operation of buildings. Together with 20 partners, the ai:L explored different approaches for functional fusions in exposed concrete components. 

C³INFRALIGHT

In the C³INFRALIGHT, various solutions were developed for the implementation of laminated ILC components: firstly, as semi-finished fine concrete elements which are filled with ILC during the construction process on the building site. Sec-ondly, with a layer-separating, three-dimensional reinforcement textile which allows to realize free-formed components with layered ILC. In addition, the material-specific characteristics were determined in building physics tests in order to characterize the material. Eventually, three prototypes were designed and produced that illustrate the advantages of the ILC as well as various reinforcement concepts in carbon and basalt.

C³SANDWICH

For the development of three-dimensionally shaped sandwich elements, various natural curving and folding principles were used in the C³SANDWICH and converted into façade designs. Together with the partners, various reinforcement concepts for the bearing connection of the outer layers were developed and load tests were carried out for one of these variants, for which the ai:L designed and manufactured suitable test specimens. Another focus was the investigation of possible applications of basalt within the sandwich construction, which can be an alternative to carbon and AR-glass.

C³PV

In the subproject C³PV, various solutions for an aesthetical combination of solar components and concrete were devel-oped as well as an exemplary system structure. With the aid of parametric-generative design tools, different facade de-signs have been developed which align the integrated photovoltaic components in the optimum position to the sun. With that the yield per square meter of PV module can significantly be increased. In total, four different prototypes were planned and realized together with the partners, which illustrate the developed range of solutions.

C³SUPERCON

In C³SUPERCON, the ai:L defined areas of application and requirements for building integrated storage and quantified the needed storage capacity using a reference building. Also, different integration principles into the building envelope could be worked out. Since the storage systems based on films and fabrics have not been technically mature yet, the building envelope construction and storage concepts were developed in an overview. In this subproject, two prototypes were planned and realized together with the partners, who present the two storage technologies pursued.

C³DAYLIGHT

Within the C³DAYLIGHT a slim, heat-insulated and translucent concrete sandwich with integrated light conducting fibres was designed in cooperation with the partners. For its realization, the two solutions "woven 3D textile with integrated light conducting fibres" (preferred option) and "rigid insulating core with inserted light conducting fibres" were devel-oped. In addition, for the distribution of the light conducting fibres on the concrete surface, a digital script was created, which allows to vary the design of the elements by changing variables such as axis distances or fibre radii. Eventually, several prototypes with interwoven light conducting fibres and insulated cores were realized.

C³LED

In the C³LED, the architecturally high-quality integration of LEDs into carbon concrete components has been pursued in order to reproduce static and dynamic information in real-time and thus activate building envelopes for additional func-tions such as signage. For this research approach, various revisable and non-revisable combination principles for LEDs and concrete have been formulated and an exemplary system design and utilization concepts have been developed. Five prototypes were planned and realized together with the partners, who impressively demonstrate the developed solutions.

C³LINK

In addition to the content and organizational overall management of the B4, the C³LINK carried out the networking of the B4 subprojects. For this purpose, a comprehensive electrical engineering, a control system for all elements with elec-trical additional function and a common prototype of C³LED, C³SuperCon and C³PV were designed and realized. The pro-tection of intellectual property was another important subject area for which the Institute cooperated with patent attor-neys. In order to be able to classify the new functional integrations ecologically, an ecological evaluation was carried out by the subcontractor "Lehrstuhl für Betriebswirtschaftslehre" (TU Dresden) on the basis of the results of the subproject C³PV.