Time dependent behaviour of fibre pull-out in self-compacting concrete

In the present study, the effectiveness of fibres in transferring stress across cracks under a sustained load was assessed. Single fibre pull-out creep tests were performed, in which fibre slip was monitored as a function of the time. The influence of the fibre orientation angle (0, 30 and 60°), as...

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Bibliographic Details
Published in:Cement & concrete composites 2017-03, Vol.77, p.14-28
Main Authors: Abrishambaf, Amin, Barros, Joaquim A.O., Cunha, Vitor M.C.F., Frazão, Cristina
Format: Article
Language:English
Subjects:
Bond
Creep
Fibre pull-out
Long-term load
Steel fibre reinforced self-compacting concrete
Time-dependent behaviour
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Summary:In the present study, the effectiveness of fibres in transferring stress across cracks under a sustained load was assessed. Single fibre pull-out creep tests were performed, in which fibre slip was monitored as a function of the time. The influence of the fibre orientation angle (0, 30 and 60°), as well as pre-imposed fibre slip levels, spr, 0.3 and 0.5 mm on the creep response was investigated. Additionally, instantaneous fibre pull-out tests were carried out on undamaged-bond specimens in order to quantify the effects of the pull-out creep behaviour. The damage introduced by the pre-slip levels in the bond of the fibre/matrix interface influenced the long-term fibre pull-out behaviour and, consequently, accelerated the creep rate. However, the assembled pull-out creep behaviour did not differ considerably from the instantaneous pull-out behaviour for the adopted pre-imposed fibre slip levels.
ISSN:0958-9465
1873-393X
DOI:10.1016/j.cemconcomp.2016.12.004