CORROSION DURABILITY AND MECHANICAL PERFORMANCE OF GREEN HYBRID FIBER REINFORCED CONCRETE UTILIZING RECYCLED CONCRETE AGGREGATE AND HIGH VOLUME FLY ASH

Author(s): Jacob F. Duncan, Wilson Nguyen, Daniela Martinez, Gabriel Jen, Claudia P. Ostertag
Paper category: Proceedings
Book title: IV International Conference Progress of Recycling in the Built Environment
Editor(s): Isabel M. Martins, Carina Ulsen, Yury Villagran
ISBN:
e-ISBN: Isabel M. Martins, Carina Ulsen, Yury Villagran
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 291-298
Total Pages: 08
Language : English

Abstract: Concrete composites that utilize recycled concrete aggregate (RCA) and high volume fly ash
(HVFA) are compared in a long-term corrosion study. Hybrid fiber reinforced concrete
(HyFRC), a composite containing multiple tiers of discontinuous steel and polymer fibers to
achieve multi-scale crack control, is compared with a non-fiber-reinforced concrete in
reinforced concrete beam elements. Mechanical properties of HyFRC containing RCA and
HVFA are investigated. Beam specimens were subjected to chloride-solution ponding, with
electrochemical measurements used to monitor corrosion initiation and propagation during a
224-week (4-year) period. To capture the presence of service-level cracking in reinforced
concrete (RC) structures, a subset of beam specimens in this study were placed under a
flexural preloading protocol prior to saltwater ponding to account for such service conditions.
The presence of fiber reinforcement reduced flexural crack widths in preloaded specimens,
leading to an increase in time to corrosion initiation. Crack resistance provided by hybrid fiber
reinforcement additionally improved the cracking behavior during corrosion propagation and
residual flexural testing revealed no significant degradation in flexural performance.

Online publication : 2018
Publication type : full_text
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