Textile Reinforced Concrete Structures - Bending tests of one-way slabs
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Examensarbete för masterexamen
Program
Modellbyggare
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Sammanfattning
Textile Reinforced Concrete (TRC) is a promising solution to optimize material use,
reduce carbon emissions, and develop new building techniques to reduce the use of
finite resources. The possibilities with TRC also include its corrosion-resistance,
which prolongs the service life and reduces maintenance needs.
In this thesis, experiments on carbon fibre reinforced one-way concrete slabs were
carried out, to study the flexural behaviour in four-point bending tests. The aim of
this Master’s thesis project was to provide data for further development of modelling
methods for TRC and give new insights in the structural behaviour of TRC.
Specimens were produced with two manufacturing methods: clamped mesh and wet
lay-up. Two different types of carbon fibre meshes, placed in two different
orientations, and combined with two types of concrete were studied. Load-and deflection relation, maximum load, crack pattern and crack width were studied. To
observe and measure the behaviour, Digital Image Correlation (DIC) was used.
Thereby the full strain field, and thus the deformations, crack width and crack
propagation were measured in detail.
Specimens with type 2 mesh, which was a denser mesh, had a higher load capacity
than those with type 1 mesh. The specimens with mesh type 2 also showed a smaller
deflection at failure compared to all other specimens, and had a higher stiffness in the
cracked stage. Type 1 mesh was tested as both 0° and 45° orientation angle. A brittle
failure with rupture of the textile took place in tests with the mesh in 0°, while a
slightly more ductile behaviour in form of pull-out of the bundles occurred in tests
with the mesh in 45°. The number of cracks in each specimen showed a large variety
and better casting quality of the specimen resulted in more cracks. Further, the
transverse yarn showed to be a crack initiator for mesh type 1.
The utilization factor of the tensile strength of the textile mesh was on average 0.37
for specimens with 0° orientation mesh, while it was only 0.23 for specimens with
45°. The utilization factor is an important design parameter to consider and improve
to make TRC-structures more competitive.
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Ämne/nyckelord
Textile reinforcements, textile reinforced concrete, TRC, carbon fibre,, one-way slab, four-point bending test, DIC, wedge splitting test