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Drainage concrete pipes with hybrid reinforcement

Title: Drainage concrete pipes with hybrid reinforcement
Author(s): A.D. de Figueiredo and R. Campos Escariz
Paper category : conference
Book title: 2nd International RILEM Conference on Strain Hardening Cementitious Composites (SHCC2-Rio)
Editor(s): R.D. Toledo Filho, F.A. Silva, E.A.B. Koenders and E.M.R. Fairbairn
ISBN: 978-2-35158-120-9
e-ISBN: 978-2-35158-121-6
Publisher: RILEM Publications SARL
Publication year: 2011
Pages: 391 - 398
Total Pages: 8
Nb references: 7
Language: English

Abstract: Brazil is passing through an economic growing process where basic infrastructure systems are highly demanded. Among them there is the need of water and sewage collecting systems production. In order to provide a low cost alternative for concrete pipes production, an experimental study was developed focusing the analysis of hybrid reinforcement, combining steel wires and steel fibres. It was demonstrated in previous studies that fibres alone can provide a strain hardening behaviour for concrete pipes with diameters of 600 mm or 800 mm. But for pipes with diameters of 1000 mm and greater wall thickness, there is no fibre alignment enough to provide such behaviour. The alternative of hybrid composition of the reinforcement was chosen by the fact that fibres provided a better performance for low level of deflections, although steel wires increase the post peak strength at higher levels. On that purpose, concrete pipes with nominal diameters of 1000 mm and 1500 mm length were produced using tree different kinds of reinforcement: steel fibres, steel wires and hybrid. The pipes were submitted to the full scale crushing strength test with continuous control of the diameter displacement. The tests were carried out using the cyclic procedure proposed by Brazilian and European standards for steel fibre reinforced concrete pipes. In that situation it was possible to compare the behaviour of the components at the pre-crack and post-crack stage. The results show that the single reinforcement provided a typical softening response of the pipes. On the other hand, the hybrid reinforcement provided a strain hardening behaviour, which generates a better response at low and high displacement levels.

Online publication: 2012-01-25
Publication type : full_text
Public price (Euros): 0.00

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