Carbonbeton – Hochleistungsbaustoff mit Effizienzpotenzial / Carbon Concrete – a High-Performance Material with Great Efficiency Potential

Kahnt, Alexander

doi:10.11129/9783955533236-007

Cited by 3 publications

(6 citation statements)

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“…Five to six times stronger (3000 N/mm 2 instead of 500 N/mm 2 ). 5 Thanks to the higher tensile strength, there is a much finer crack pattern and consequently less structural damage. The concrete to be used varies between ultra-high-strength special concrete, high-strength fine concrete and conventional normal concrete, depending on the production process and the area of application.…”

Section: Carbon Reinforced Concretementioning

confidence: 99%

“…In addition, it is enormously efficient: compared to conventional steel reinforcement, carbon reinforcement is four times lighter and at the same time approx. Five to six times stronger (3000 N/mm 2 instead of 500 N/mm 2 ) 5 . Thanks to the higher tensile strength, there is a much finer crack pattern and consequently less structural damage.…”

Section: Basicsmentioning

confidence: 99%

“…In addition, the service life and load‐bearing capacity of solid structures in need of renovation are demonstrably increased by reinforcement layers made of carbon concrete. The great scope for design opened up by the lightness of the envelope construction and the possibility of integrating additional functions such as heating, lighting, or building automation into the components are further positive aspect 4,5 …”

Section: Challengesmentioning

confidence: 99%

“…The great scope for design opened up by the lightness of the envelope construction and the possibility of integrating additional functions such as heating, lighting, or building automation into the components are further positive aspect. 4,5…”

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confidence: 99%

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

Tietze¹,

Kirmse²,

Kahnt

et al. 2022

Civil Engineering Design

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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 concrete construction method is forecast based on potential market segments.

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Section: Carbon Reinforced Concretementioning

confidence: 99%

Section: Basicsmentioning

confidence: 99%

Section: Challengesmentioning

confidence: 99%

mentioning

confidence: 99%

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

Tietze¹,

Kirmse²,

Kahnt

et al. 2022

Civil Engineering Design

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“…Modular, sustainable, and prefabricated construction methods involving carbon reinforced concrete building elements 1,2 require new connectors that enable a simple and safe assembly. The ongoing integration of building services and renewable energy technologies such as integrated photovoltaics or energy storing elements 3,4 enhances the vulnerability of individual components.…”

Section: Introductionmentioning

confidence: 99%

Iron‐based shape memory alloy active assembly connectors for civil structures

Thüsing

Sobotta²,

Schlüter

et al. 2023

Structural Concrete

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The lack of suitable connectors for thin‐walled carbon concrete elements with their known resource and material saving properties still represents a major obstacle for practical application. On top, the on‐site installation remains a labor‐intensive task. To overcome this limitation, we report the development of an active assembly connector that enables simple and safe installation of carbon concrete façade elements and increases assembly efficiency. Moreover, the active assembly features permit an assembly without physical access to the connector, called blind assembly. Its concept is based on the recovery expansion of iron‐based shape memory alloys (Fe‐SMA). This paper presents material characteristics such as recovery stress and strain of the Fe‐SMA in compression. The connector concept uses an anchor rail that blocks the recovery extraction of a Fe‐SMA‐fastener to produce a stable, frictional and linear connection. Tensile tests show the impact of design parameters and high pull‐out forces with sufficient design. Also, ongoing long term tensile tests show small creep, so far. The anchor channels integrate well with carbon concrete façade panels. The heating concept with heating cartridges works well, even under cold winter conditions. Wind test results exceed requirements. Finally, a field test shows excellent installation results and proves the ease of assembly as well as the ability for blind assembly.

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Investigation of Helix-Pultruded CFRP Rebar Geometry Variants for Carbon-Reinforced Concrete Structures

Wohlfahrt,

Peller,

Müller

et al. 2023

Polymers

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Carbon concrete is a new, promising class of materials in the construction industry. This corrosion-resistant reinforcement material leads to a reduction in the concrete cover required for medial shielding. This enables lean construction and the conservation of concrete and energy-intensive cement manufacturing. Bar-type reinforcement is essential for heavily loaded structures. The newly developed helix pultrusion is the first process capable of producing carbon fiber-reinforced polymer (CFRP) reinforcement bars with a topological surface in a single pultrusion process step, with fiber orientation tailored to the specific loads. The manufacturing feasibility and load-bearing capacity were thoroughly tested and compared with other design and process variants. Approaches to increase stiffness and strength while maintaining good concrete anchorage have been presented and fabricated. Tensile testing of the helical rebar variants with a 7.2 mm lead-bearing cross-section was conducted using adapted wedge grips with a 300 mm restraint length. The new helix geometry variants achieved, on average, 40% higher strengths and almost reached the values of the base material. Concrete pull-out tests were carried out to evaluate the bond properties. The helix contour design caused the bar to twist out of the concrete test specimen. Utilizing the Rilem beam test setup, the helical contour bars could also be tested. Compared with the original helix variant, the pull-out forces could be increased from 8.5 kN to up to 22.4 kN, i.e., by a factor of 2.5. It was thus possible to derive a preferred solution that is optimally suited for use in carbon concrete.

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Carbonbeton – Hochleistungsbaustoff mit Effizienzpotenzial / Carbon Concrete – a High-Performance Material with Great Efficiency Potential

Cited by 3 publications

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

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

Iron‐based shape memory alloy active assembly connectors for civil structures

Investigation of Helix-Pultruded CFRP Rebar Geometry Variants for Carbon-Reinforced Concrete Structures

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Carbonbeton – Hochleistungsbaustoff mit Effizienzpotenzial / Carbon Concrete – a High-Performance Material with Great Efficiency Potential

Cited by 3 publications

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

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

Iron‐based shape memory alloy active assembly connectors for civil structures

Investigation of Helix-Pultruded CFRP Rebar Geometry Variants for Carbon-Reinforced Concrete Structures

Contact Info

Product

Resources

About

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

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