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Title: Flexural strengthening of RC slabs with CRC and the influence of the positional accuracy

Author(s): Egbert Müller, Sarah Bergmann, Manfred Curbach, Josef Hegger

Publication: Symposium Paper

Volume: 345


Appears on pages(s): 243-257

Keywords: Textile Reinforced Concrete (TRC), Carbon Reinforced Concrete (CRC), Fabric Reinforced Cementitious Matrix (FRCM), flexural strengthening of RC slabs, experimental tests, calculation model, positional accuracy

DOI: 10.14359/51731585

Date: 2/1/2021

Carbon Reinforced Concrete (CRC) can be used for new structures and to strengthen existing components. Carbon fibre rods and fabrics are used as reinforcement for new components. Besides CFRP-lamellas, grid-like carbon reinforcements and shotcrete are very suitable for strengthening. Due to the low concrete cover, thin strengthening layers can be realised, which minimise the additional dead load. Depending on the chosen fibre material and impregnation, different failure mechanisms can be observed. The fibre strand should preferably be able to reach the maximum stress under load, but at this stage, the bond behaviour has to be thoroughly considered to prevent failure due to pull-out or delamination. Two carbon reinforcement fabrics are currently being investigated in the research programme C³ - Carbon Concrete Composite.This paper presents the results of large-scale tests on reinforced concrete slabs strengthened with CRC. In addition to the strengthening procedure and the large-scale component tests that have been carried out, this paper deals mainly with the recalculation of the test results and the positional accuracy of the carbon reinforcement and its influence on the flexural strength.