Partial acceptance of the BOX
On 11 May, the partial acceptance of the first construction phase "Shell-BOX" took place on the construction site of the carbon reinforced concrete building CUBE at the corner of Zellescher Weg and Einsteinstaße in Dresden. Bendl HTS was responsible for this as a member of the joint venture Hentschke Bau and Bendl HTS.
The walls for the BOX were produced in a precast concrete plant, in this case in Betonwerk Oschatz, using conventional semi-automatic processes for semi-finished parts. It consists of a double wall system with 4 cm thin carbon reinforced concrete shells. The concrete is an anthracite-colored mixture, a so-called fair faced concrete. The wall thickness of the slender structure was further reduced using Slentite high-performance insulation from BASF. The in-situ concrete core was also reduced to a minimum to achieve a wall thickness of 27 cm. Both concrete wall shells are connected with a glass fiber reinforcement bar from C³ partner Schöck Isolink. Precast elements with integrated cavities with a total thickness of d = 25 cm were developed and used for the ceiling structure.
"With the BOX, we save up to 50% of the conventional amount of concrete. In addition, it is a very light-weight construction that allows us to build in a resource-efficient way." – Says the builder and director of the Institute of Concrete Structures, Professor Manfred Curbach.
A LOOK AT THE CONSTRUCTION SITE
This is where the CUBE is being built. The site is located at the corner of Einsteinstraße and Zellescher Weg in Dresden and the responsible general contractor is a joint venture consisting of Hentschke Bau GmbH and bendl HTS Hoch- und Tiefbau GmbH & Co. KG.
The concrete is a higher strength concrete with a comparatively aggregate sizes and high flowability. The concrete mix was used in order to be able to build more slenderly on the one hand and to be able to ensure problem-free flow through the small mesh widths of the carbon reinforcement on the other.
Another positive effect is reflected in the design smooth and very high quality exposed concrete surface of the walls. Following concreting, high-performance insulation was applied to the fresh concrete. Due to the special insulation, it is possible to build thinner while maintaining the same insulating effect.
This allows a total thickness of 27 cm for the thermal double wall with a reinforcement, which makes the wall thinner compared to conventional insulation and steel reinforcement. Glass fiber bars were then inserted into the fresh concrete through pre-drilled holes in the insulation. The bars will later serve as connectors to join the two shells of the thermal double walls.
Intensive months of productive cooperation resulted in a construction contract. This was signed on 17.12.2020 by the lead representative of the consortium and managing director of Hentschke Bau GmbH, Thomas Alscher, and the client and director of the Institute of Concrete Structures, Manfred Curbach. The contract gave the starting signal for the construction of the CUBE and paves the way for future building projects made of carbon reinforced concrete.
WORLD'S FIRST HOUSE MADE OF CARBON CONCRETE
The world's first house made of carbon reinforced concrete, the so-called CUBE, is the lighthouse project of the C³ - Carbon Concrete Composite e. V. It presents the usable results visibly and with public appeal and is currently being built near Fritz-Förster-Platz in Dresden. The building with a planned gross floor area of approx. 220 m² will be an experimental building and at the same time a test stand. It will be used primarily for research into the long-term suitability of carbon concrete from the point of view of structural design, statics and building physics. The operating and life cycle costs will also be assessed.
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"Special times call for special foundation stone"
Michael Kretschmer, Prime Minister, Free State of Saxony
VISION BECOMES REALITY
The world is looking to Dresden for the first building made of carbon reinforced concrete that will fundamentally change construction technology and the building industry. With the start of the state-of-the-art building, made entirely of non-metallic reinforcement, Germany is the pioneer in the global market for climate-friendly, innovative and sustainable construction using concrete.
"Digital laying of the foundation stone"
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THE FOUNDATION WAS LAID
"Green concrete," "super concrete," "Formula 1 concrete," "bio concrete." Carbon reinforced concrete has received numerous nicknames throughout its career, no wonder with so many properties that give it a lot of advantages in the construction industry. Now carbon reinforced concrete is going digital, or to be more precise, laying the foundation stone for the first house made of carbon reinforced concrete: CUBE.
Without any health risks and in compliance with strict hygiene regulations, project manager Michael Frenzel and project coordinator Matthias Tietze laid the foundation stone for the futuristic-looking building.
A carbon time capsule, specially made for the laying of the foundation stone, was symbolically inserted into the ground.
Matthias Tietze and Michael Frenzel successfully laid the foundation stone for the CUBE. Due to the Corona pandemic, representatives of politics, business and society were unable to attend the act.
THE TWIST WITH THE BOX
The CUBE basically consists of the two parts: TWIST and BOX. The TWIST elements are two shells arranged symmetrically opposite each other, each twisting out of the wall into a roof, thus simultaneously forming the lateral and upper closure of the room. The BOX is the essential part of the test stand and offers the possibility of the exchange as well as the longterm monitoring of construction elements, such as facade panels, wall elements or multifunctional carbon reinforced concrete elements in the exterior or interior, in order to be able to constantly test and present the latest state of the art.
The design planning was completed in August and the building application was submitted. All the necessary approvals have already been obtained.
User acceptance will be determined by opening the building for lectures and presentations.
Building construction will start at the end of July 2020 and will be delayed by a few weeks due to the Corona pandemic. Nevertheless, shell construction is expected to be completed by the end of the year. Interior work will be completed in the spring of 2021 and exterior work by early summer.
CARBON REINFORCED CONCRETE
Global environmental disasters, resource depletion and soaring CO2 emissions are just a few of the factors affecting the climate that are forcing us to act on all fronts. Construction in particular is a major contributor to environmental pollution worldwide, accounting for 70% of land change and 50% of energy consumption. This must change.
With carbon reinforced concrete, we save up to 80% of material and achieve a service life of well over 200 years. Carbon reinforced concrete is a composite material made of concrete and a bar- and mat-shaped reinforcement made of carbon.
The considerably thinner building structures reduce concrete and, last but not least, sand consumption and
With the help of carbon reinforced concrete, the refurbishment of existing reinforced concrete structures also leads to an extension of the service life of the structures and thus to a more climate-conscious use of our infrastructure.
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C³ – Carbon Concrete Composite e. V.
World Trade Center Dresden