Comparative study on the behaviour of different infill materials for pre-fabricated fibre composite repair systems

[Display omitted] •Constituent behaviour and mechanical properties of concrete-, shrinkage compensating cementitious- and epoxy-grout infills.•Behaviour of GFRP tubes filled with different types of grout-infills.•Pre-fabricated FRP composite repair system for deficient structures.•Theoretical model...

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Bibliographic Details
Published in:Construction & building materials 2018-05, Vol.172, p.770-780
Main Authors: Mohammed, Ali A., Manalo, Allan C., Maranan, Ginghis B., Zhuge, Yan, Vijay, P.V.
Format: Article
Language:English
Subjects:
Analysis
Characterization of FRP and FRC materials/systems
Composite jacket
Composite materials
Epoxy resins
Fiber reinforced concrete
FRP tube
Grout-infills
Mechanical properties
New composite materials
Properties
Systems and strengthening techniques
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Summary:[Display omitted] •Constituent behaviour and mechanical properties of concrete-, shrinkage compensating cementitious- and epoxy-grout infills.•Behaviour of GFRP tubes filled with different types of grout-infills.•Pre-fabricated FRP composite repair system for deficient structures.•Theoretical model development to predict the overall behaviour of composite repair systems with different infill materials. Prefabricated fibre-reinforced polymer (FRP) composite jacket is now becoming an effective repair system for deteriorating piles and columns exposed to marine environment. This system works by providing grout infills between the annulus of the existing structure and the composite jacket. Few studies are however available on the optimal grouting materials that can effectively transfer the stresses between the existing structure and the FRP jacket. This study is investigating the effect of cementitious, concrete and epoxy-based grout infills on the structural behaviour of pre-fabricated glass-FRP (GFRP) tubes. The considered grouts have compressive strength and modulus of elasticity ranging from 10 MPa to 70 MPa and from 10 GPa to 35 GPa, respectively. The experimental results showed that the behaviour of the composite repair system is highly dependent on the modulus of elasticity and the compressive strength of the grout infill. The brittle failure behaviour of the cementitious and epoxy grouts led to localised failure in the FRP repair system while the progressive cracking and crushing of the concrete infill resulted in effective utilisation of the high strength properties of the composite materials. Theoretical analysis of the overall compressive behaviour has also been conducted and showed very good agreement with the experimental results.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2018.04.025