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Silica modified synthetic fiber for improving interface property in FRCC

Author(s): Z. Yang, J. Liu, J. Liu, C. Li, H. Zhou
Paper category: Conference
Book title: 8th RILEM International Symposium on Fiber Reinforced Concrete: challenges and opportunities (BEFIB 2012)
Editor(s): Joaquim A.O. Barros
Print ISBN: 978-2-35158-132-2
e-ISBN: 978-2-35158-133-9
Publisher: RILEM Publications SARL
Pages: 347 - 357
Total Pages: 10
Language: English

In order to improve the interfacial bonding properties of synthetic fiber-cement matrix, a series of modified fibers were prepared by sol-gel chemical deposition of nano-silica. The effect of chemical deposition time on modification efficiency was observed.The distribution of nano-particles on the fiber surface was tested with scanning electron microscope (SEM). Single fiber pull-out behavior and plastic crack-resistance experiments were carried out to confirm the advantage of modified fiber. This paper focuses on explore the law of modified fiber for improving interfacial properties of fiber reinforced cementitious composites (FRCC) and present the possible mechanism, especially. The results demonstrate that the proper chemical deposition time is 60 mins for polypropylene (PP) fiber. As for the fibers have hydrophilic or hydrophobic surface properties, the distribution morphology of nano-silica on PP and polyvinyl alcohol (PVA) fiber surface is obvious different. The interfacial bond strength of modified fiber-matrix was improved significantly from the pull-out behavior curves, therefore, all the modified fibers have excellent crack-resistance property. The interfacial property of fiber-matrix is improved because of nano-silica’s hydration activity, the hydration products act as physical anchors and chemical combination during pull-out and crack-resistance.

Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00

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