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INCREASED EFFICIENCY OF COLUMN STRENGTHENING WITH TRC BY ADDITION OF SHORT FIBRES IN THE FINE-GRAINED CONCRETE MATRIX



Author(s): R. Ortlepp
Book Title: Seventh International RILEM Conference on High Performance Fiber Reinforced Cement Composites (HPFRCC7)
Editor: H.W. Reinhardt, G.J. Parra-Montesinos, H. Garrecht
ISBN: 978-2-35158-145-2
e-ISBN: 978-2-35158-146-9
Publisher: RILEM Publications SARL
Publication year: 2015
Pages: 29-36
Total Pages: 8
Language: English


Abstract: Textile Reinforced Concrete (TRC) can be used to improve the load carrying capacity of columns. The strengthening effect is due to the confinement effect of the textile reinforcement and the additional concrete cover. Under the multi-axial load distribution, lateral tensile stress arises from the longitudinal pressure in the column. While the fine-grained concrete in the inner range of the TRC jacket can withstand this lateral tension, the outer jacket range, where the textile is anchored in the matrix, is unable to do so. If the tensile strength of the finegrained concrete is exceeded, the result is spalling of the concrete cover and thus to a loss of cross sectional area, as well as partial damage of the bond surface of the textile reinforcement. This may result in a zipper-like failure of the anchorage so that the textile reinforcement “decoils” from the column. The addition of short fibres to the TRC-matrix can significantly increase the resistance to bond failure of the column confinement by “needling” the finegrained concrete layers through small openings in the textiles. A TRC-matrix with PVA short fibres was found to be the most efficient of the investigated samples.


Online publication: 2015
Publication Type: full_text
Public price (Euros): 0.00