DURABILITY PERFORMANCE OF STRAIN HARDENING FIBER REINFORCED CONCRETE

Author(s): Y. Shao, L. Jiang and Z. He
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: 227-234
Total Pages: 8
Language: English

Abstract: To achieve strain hardening behavior in fiber reinforced concrete (FRC), use of high strength high ductility polymer fibers are effective in distributing the load and generating multiple cracking. Because of the use of polymer fibers, the durability performance may be sacrificed in comparison to metallic fibers. This paper is to present a study on the durability performance of strain hardening FRC exposed to freeze-thaw cycling. Strain hardening behavior was achieved in concrete by introducing polyvinyl alcohol (PVA) fibers at a volume ratio of 2%. It was found that post-peak strain hardening was more difficult to achieve in concrete than in mortar because of the low cement content and rough aggregate interface. For strain hardening FRC using PVA fiber, strength loss and strain hardening reduction were observed after 200 freeze thaw cycles. This was possibly attributed to the mismatch of elastic modulus of PVA fiber with concrete which was activated by temperature change. Since strain hardening in PVA fiber reinforced concrete is mainly attributed to the adhesive bond between fibers and matrix, the corresponding decrease in toughness was indicative of bond deterioration.

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