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5. Bauphysik

Author

Grunewald, John, primary, Holz, Karoline, additional, Juknat, Michael, additional, Kahnt, Alexander, additional, Reichel, Stephan, additional, Schmidt, Jörg, additional, and Stelzmann, Mario, additional

Published
2023
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8. Scale-up of aerogel manufacturing plant for industrial production

Author

Eckert, Kathrin, Dicke, Erik, Morales, Alberto Bueno, Smirnova, Irina, Kahnt, Alexander, Böhm, Robert, Suchorzewski, Jan, and Thieme, Mike Bernd

Subjects
Ingenieurwissenschaften, Technik
Abstract

The special characteristics of aerogels in terms of lightweight, porous and super-insulation recommends their application in the area of building and construction. The definition of super-insulation states better insulation behavior than air. The thermal conductivity of conventional insulation products such as EPS or mineral wool are typically in the range of 30-50 mW/(m⋅K). In comparison, silica aerogels are characterized by a thermal conductivity of 12-20 mW/(m⋅K) and cellulose aerogels by a thermal conductivity of 15-20 mW/(m⋅K). This low thermal conductivity, which results from the interplay of air-filled pores and skeletal backbone, enables a more efficient and flexible application as insulation material for nearly zero energy buildings (nZEB). The limiting factor for the actual application of aerogels in an industrial scale, is currently the aerogel production. Furthermore, the supply chains of aerogels are not yet established enough to enable widespread market application. Within this work, a scale-up of the aerogel production line is performed to reduce production costs for broader market uptake. The overall scale-up includes the scale-up of each manufacturing step: gelation, solvent exchange, and supercritical drying. With this, a production capability of 50 lt. of solvent exchanged particles per day and up to 2000 lt. aerogels per year are aimed. This involves a large-scale gelation and solvent exchange plant, as well as the utilization of a 64 L autoclave for the supercritical drying step with integrated software for an automated drying. In addition to the scale-up of the manufacturing plant, different approaches to applying aerogels in insulation materials are considered in this work. A key point is the development of carbon fiber reinforced textile concrete (TRC) with a sandwich core made of Cellular Lightweight Concrete (CLCi) including silica or cellulose aerogels.

Published
2022

10. Bauphysikalische Voruntersuchungen in der Planungsphase des CUBE.

Author

Stelzmann, Mario, Kupke, Marén, and Kahnt, Alexander

Subjects
REVERBERATION time, SOUNDPROOFING, CONCRETE walls, SOUND measurement, ENERGY consumption, PHYSICS
Abstract

Copyright of Beton- Und Stahlbetonbau is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2023
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11. Fertigteilbauweise mit Carbonbeton und Aerogel‐Wärmedämmung.

Author

Stelzmann, Mario, Zocher, Birgit, Pickert, Ludwig, Bendl, H., Kahnt, Alexander, and Holschemacher, Klaus

Subjects
CONCRETE construction, PRECAST concrete, REINFORCED concrete, THERMAL insulation, CONSTRUCTION projects
Abstract

Copyright of Beton- Und Stahlbetonbau is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2023
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12. The ecological and economic advantages of carbon reinforced concrete—Using the C³ result house CUBE especially the BOX value chain as an example

Author

Tietze, Matthias, Kirmse, Susanne, Kahnt, Alexander, Schladitz, Frank, Curbach, Manfred, Tietze, Matthias, Kirmse, Susanne, Kahnt, Alexander, Schladitz, Frank, and Curbach, Manfred

Abstract

Against the background of global warming and the associated need to drastically reduce energy and resource consumption, action must also be taken in the building sector. Resource-efficient construction methods must be used that nevertheless allow the increasing construction tasks in areas such as infrastructure and housing to continue to be fulfilled. In order to successfully introduce a new construction method to the market, the aspects of recyclability and economic efficiency are essential, in addition to important government requirements for climate neutrality and technical performance. Above all, the economic viability, that is, the economic advantageousness, as well as its simple applicability compared to competing systems, decides on the success and widespread use of a new technology. Carbon reinforced concrete, with its outstanding technical properties and simultaneous material efficiency, is an important building block toward climate neutrality in the construction industry. It is a promising technology that still has to prove its economic advantages and robust applicability under market conditions. In addition to the infrastructure sector, there is great potential in the area of housing creation, which needs to be tapped for carbon reinforced concrete. For this challenge, it is necessary to design a competitive value chain that allows the realization of marketable products in mass production on existing plant technology. The article gives a short overview of the economic and ecological status quo in the field of prefabricated construction with carbon concrete, using the example of the C3-result building CUBE. In particular, the CUBE-BOX, which is made of prefabricated and semi-prefabricated parts, is examined in more detail and the carbon reinforced concrete components used are compared with classic reinforced concrete constructions in terms of sustainability. In this context, the conceivable global climate protection contribution of the carbon reinforced co

Published
2022

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