Carbon reinforced concrete - research
C - 18 Prefabricated elements with latticed girders made of carbon fiber rovings
Reinforced concrete precast elements (FFT) have established themselves in the construction industry as semi-finished products for solid walls and slabs in order to achieve rapid construction progress in conjunction with low formwork requirements. The use of steel lattice girders is an established, proven technology for the production of FFT. However, the susceptibility of reinforcing steel to corrosion and the high transport costs prevent innovative building constructions in resource-saving sandwich or hollow core construction methods.
Compared to conventional steel reinforcement, the use of textile reinforcement materials that are insensitive to corrosion offers the potential for economic and resource-saving constructions in sandwich or hollow core design. Therefore, the aim is to replace the steel lattice girders used so far with net lattice girders made of carbon fibre rovings. The mesh girders have to provide the necessary reinforcement for the use and handling of the new precast floor slabs and also form part of the flexural reinforcement of the floor slab. In order to achieve the compressive stability necessary to ensure accessibility during assembly, shear-resistant elements are therefore required.
Within the scope of this diploma thesis, novel precast floor slabs with mesh girders are to be investigated on the basis of numerical simulations. For this purpose, the textile-physical properties of the mesh girders are first to be determined with the help of carbon fibre rovings provided. The material characteristics serve as input variables for the numerical modelling with ANSYS®, with the help of which the load-bearing behaviour of the novel precast floor slabs with mesh girders is to be investigated. Finally, it is to be evaluated to what extent the arrangement of cavities in FFT with mesh girders is possible.
Contact person:
Marina Stümpel, M.Sc.
Phone: 0351-463-39820
E-Mail:
C - 16 Set up of one (more) design tools for carbon concrete with parameter studie
Description There are many commercially available software programs for the design of reinforced concrete members. For carbon concrete there are none available yet. For this reason, design tools for individual verifications are to be developed within the scope of the work. In addition, various parameter studies are to be carried out with the help of these.
Contact person:
Dr.-Ing. Alexander Schumann
CARBOCON GmbH
E-mail:
Phone: 0351-48205511
Ammonstraße 72
01067 Dresden
C - 15 Establishment of a calculation approach for the composite joint load-bearing capacity between the old concrete and the reinforcing layer in carbon concrete-reinforced structural elements
The reinforcement of existing reinforced concrete components is one of the fields of application for the composite material carbon concrete. The basic suitability of the material for reinforcement has already been successfully demonstrated several times. However, the problem with reinforcement is often that, due to the performance of the carbon concrete, the composite joint between the old concrete and the reinforcement has a decisive influence on the failure. More in-depth considerations will be carried out in the course of this work.
Contact person:
Dr.-Ing. Alexander Schumann
CARBOCON GmbH
E-mail:
Phone: 0351-48205511
Ammonstraße 72
01067 Dresden
C - 14 Investigations into the rotational capability or ductility of carbon concrete components
Due to its many positive properties, carbon concrete has established itself as an alternative to reinforced concrete construction in both reinforcement and new construction. However, some issues have not yet been finally clarified. One open issue for new buildings made of carbon concrete is the definition or specification of a ductility criterion. Since the pure carbon reinforcement has a linear-elastic material behavior, the valid ductility criteria from reinforced concrete construction cannot be transferred to carbon concrete. This problem is to be dealt with within the scope of the diploma thesis.
Contact person:
Dr.-Ing. Alexander Schumann
CARBOCON GmbH
E-mail:
Phone: 0351-48205511
Ammonstraße 72
01067 Dresden
C - 12 Increasing the stability of slender structures made of carbon reinforced concrete
With the considerable reduction in thicknesses in carbon reinforced concrete construction compared to conventional reinforced concrete construction, the issue of stability is increasingly gaining in importance. Within the scope of the diploma thesis, it will be investigated which aspects of stability (global buckling, local buckling) can be decisive for carbon reinforced concrete and by which structural measures (e.g. stiffeners, beading etc.) stability can be improved.
First of all, a literature review on stability needs to be carried out, taking into account studies from (steel reinforced) concrete construction and structural steel engineering. Based on the results, an experimental program is to be derived. For the experimental investigations, the test procedure is to be planned, the test specimens and the test rig are to be prepared, and initial tests will be carried out and evaluated. The experimental investigations will be used to verify the theoretical approaches/results and to demonstrate the effectiveness of stability-enhancing measures.
Contact person:
Dipl.-Ing. Josiane Giese
Phone: 0351 463-39815
E-mail:
C - 7 Presentation and comparison of different methods for characterizing the composite behavior of impregnated textile reinforcements in composite carbon concrete
The bond behavior of the composite material carbon concrete can be described by means of the bond stress-slip relationship (VSB). This relationship is used in practice to calculate end-anchorage and lap lengths. The bond between the textile reinforcement and the concrete is based on different mechanisms such as positive, adhesive and frictional connection.
In this work, different methods for characterizing the composite behavior of carbon concrete will be compared both theoretically and experimentally. The methods already used in the scientific community to determine the CDB are to be compared and their respective approaches to describing the bonding mechanisms are to be presented.
First of all, a literature review is to be carried out with regard to the existing methods for describing the bond behavior of carbon concrete. National and international research findings are to be taken into account. Subsequently, the main differences will be pointed out and discussed scientifically. The experimental test setups for determining the CDB are to be compared with each other both theoretically and practically. For this purpose, different pull-out tests will be carried out on different textiles.
Finally, a suitable test setup is to be derived on the basis of the findings obtained.
Contact person:
Dr.-Ing. Alexander Schumann
CARBOCON GmbH
E-mail:
Phone: 0351-48205511
Ammonstraße 72
01067 Dresden
C - 5 Stress on built-in parts Carbon concrete
When using carbon reinforcement in precast construction, a reduction in component thicknesses to a few centimeters can be achieved. However, the use of built-in components familiar from reinforced concrete, such as fasteners and transport anchors, remains indispensable and is reinforced by the increased use of the precast concept.
The development of fasteners for joining slender carbon concrete components requires, among other things, knowledge of the mechanical stresses that occur. For this reason, component- and use-specific loads in the coupling areas are to be investigated. The result of the diploma thesis is to be a clear presentation of possible actions and the forces and moments to be transmitted derived from them.
Contact person:
Dr.-Ing. Harald Michler
Phone: 0351 463-32550
E-mail: Harald.Michler@tu-dresden.de
C - 2 Prestressed reinforcement made of carbon, glass and basalt
Possibilities and boundary conditions for the manufacture and use of prestressed textile reinforcements. The focus of the work is on FE investigations in principle or, alternatively, an experimental approach. Details will be determined depending on the current project status.
Attention: previous knowledge in FE as well as independent working methods are required.
Contact person:
Dr.-Ing. Harald Michler
Phone: 0351 463 32550
E-mail: