Pull-out Phenomenon of Synthetic Macro Fibres from a Cementitious Matrix

Author(s): Adewumi J. Babafemi and William P. Boshoff
Paper category: Proceedings
Book title: Proceedings of International Conferences (ICACMS) Advances in Construction Materials and systems Vol 2
Editor(s): Manu Santhanam, Ravindra Gettu, Radhakrishna G. Pillai, Sunitha K. Nayar
ISBN: 978-2-35158-194-0
e-ISBN: 978-2-35158-191-9
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 392-400
Total Pages: 9
Language : English

Abstract: Studies to quantify the creep of cracked fibre reinforced concrete have seen a marked increase in recent times. Even though it is known that one of the mechanisms responsible for the crack widening of cracked macro-synthetic fibre reinforced concrete under sustained loading is fibre pull-out, this phenomenon is yet to be fully understood. It is uncertain whether fibre pull-out and lengthening are co-occurring within the matrix during sustained loading or if only the pulled out portion lengthens due to creep. This study, therefore, investigates the phenomenon occurring during the pull-out of synthetic macro fibres tested under sustained loadings. Three types of synthetic macro fibres were partially embedded in 50 mm cube mortar specimens and were subjected to a 55% load of the average maximum pull-out load obtained from single fibre pull-out tests. The time-dependent pull-out displacement was studied in a controlled climate room. X-ray computer tomography (CT) images of specimens were taken at different pull-out stages to study the mechanisms during the fibre pull-out. The results have shown that fibre lengthening and pull-out co-occurring within the cement matrix are the phenomena occurring during increased crack widening of cracked macro synthetic fibre reinforced concrete. However, fibre lengthening is prominent.

Online publication : 2017
Publication type : full_text
Public price (Euros) : 0.00