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

• Main Author: Abrishambaf, Amin
• Publication Date: 2017
• Other Authors: Barros, Joaquim A. O., Cunha, Vitor M. C. F., Frazão, Cristina Maria Vieira
• Format: Article
• Language: eng
• Source: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
• Download full: https://hdl.handle.net/1822/45449
• topic: Time-dependent behaviour; Long-term load; Creep; Fibre pull-out; Bond; Steel fibre reinforced selfcompacting concrete; Science & Technology

In the present study, the effectiveness of a fibre as an element for transferring stresses 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 degrees), 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.