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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Showing 1-5 of 738 Abstracts search results
October 1, 2020
Berrocal, C.G.; Lundgren, K.; Löfgren, I.
In the present paper, long-term experiments involving natural corrosion of RC beams
subjected to chloride solution cyclic exposure were carried out to investigate the effect of
fibres on different aspects of the corrosion process as well as their contribution to the
structural behaviour of RC elements damaged by corrosion. The long-term experiments were
complemented with short-term accelerated corrosion experiments and mechanical tests to
investigate the influence that low fibre contents may have on individual mechanisms that play
an important role in the corrosion process of steel in concrete. These showed that fibres
promote crack branching which results in a change of the internal crack pattern towards
multiple thinner cracks, particularly near the reinforcement. This agrees with the long-term
experiment results, which exhibited longer times to corrosion initiation for FRC beams with
bending cracks and revealed a more distributed corrosion with more pits but less crosssectional
loss compared to bars in plain concrete. Fibres also proved beneficial in delaying
corrosion-induced cracks and preventing cover spalling, which greatly enhanced the bondbehaviour
of corroded bars. Furthermore, a positive effect of the fibres was also observed on
the residual flexural capacity of corroded beams, which generally increased the load-carrying
capacity and rotation capacity.
Ortiz-Navas, F.; Navarro-Gregori, J.; Serna Ros, P.; Leiva Herdocia, G.
In recent years, much research has shown improvements in shear behaviour and deformation
capability when an adequate amount of macro fibres is provided in concrete. However, very
few experiments have used macro synthetic fibres. In this paper, the shear capability of
deformation in slender beams was studied by analysing the shear crack path, the crack openingslip
relationship and shear deformation of polypropylene fibre-reinforced concrete (PFRC)
beams. Shear cracks and deformations were measured by non-contact image measurement
techniques. The results are compared with those of plain concrete (PC), steel fibre-reinforced
concrete (SFRC) and reinforced concrete (RC) beams. Both types of fibres were dosed so that
similar average residual tensile strengths would remain similar to one another. The crack path
analysis results showed that synthetic fibres delayed the formation of shear cracks and their
propagation into compression zone, and improved the behaviour of secondary cracks due to
loss of bond with longitudinal reinforcement. Finally, the crack opening-slip relationship varied
widely along the crack and location in beams.
Look, K.; Mark, P.
An open design tool is developed that uses spreadsheet analyses, optimisation methods and
iterative analytical routines. Its idea is to offer a universal, intuitive instrument to economically
design and optimise steel fibre reinforced concrete members with or without rebar. The tool
comprises non-linear evaluations of sectional forces with the yield line theory, a cross sectional
design in ultimate and serviceability limit states as well as backward oriented optimisations of
reinforcements, cross sectional properties or fibre classes. It should be free of specific code
regulations and thus just basis on the assumption of plane strains, an ideal bond and requires
the definitions of uniaxial stress-strain laws, strain boundaries and fundamental design
formulas. Boundary conditions, material parameters and sectional properties as well as results
like strain or stress distributions, performance ratios and potentials of improvements are given
in visualisations and commented figures. The non-linear equations of equilibrium are iteratively
solved with reduced gradient methods. Doing so, recursive initial parameter settings of the
strain plane are – amongst other regularisations – incorporated to achieve robust solutions.
Zanotti, C.; Randl, N.; Gar, P.S.; Far, B.K.; Steiner, M.
Fiber Reinforced Concrete (FRC) is being increasingly applied in structural repair and
retrofit of reinforced concrete structures. Not only fiber reinforcement improves the durability
of reinforced concrete structures, but it also enhances compatibility of the repair material to
the existing structure, further enhancing structural effectiveness and service life of the
intervention. Furthermore, studies have shown that fiber reinforcement can significantly
improve substrate-repair bond in both tension and shear. However, this benefit is not fully
utilized in repair/retrofit design due to test uncertainties and lack of comprehensive data on
correlations with other fundamental factors. In this study, the question of the appropriateness,
reliability and sensitivity of current bond tests in case of FRC repairs is addressed. Several
tension and shear bond tests on plain and fiber reinforced cement-based repairs are performed
in parallel by two research teams at UBC (Canada) and CUAS (Austria), following a rigorous
testing procedure to allow consistency among results from the two laboratories. The influence
of repair strength and casting direction is also investigated. The effect of fiber reinforcement
on bond is assessed while correlation, comparability, and sensitivity of different test set-ups
and stress conditions are discussed.
Constantin E. Chalioris, and Chris G. Karayannis
Recently the use of special reinforcement arrangements has been extended in reinforced concrete
members under torsion. These arrangements include (a) continuous rectangular spiral reinforcement, (b) epoxy
bonded Carbon Fiber Reinforced Polymer (C-FRP) sheets as external transverse reinforcement and (c) short steel
fibers as mass reinforcement. In this study an extended experimental program of 14 beams tested under torsion is
presented. All specimens have the same geometrical characteristics but different transverse reinforcement
arrangements. Six beams are used as pilot specimens; three of them have no transverse reinforcement and three have
conventional steel stirrups. Further, two specimens have continuous steel spirals; four specimens have steel fibers as
mass reinforcement and two specimens have externally bonded C-FRP sheets. The torsional behavior of these
specimens is presented and compared to the behavior of the pilot specimens. Discussion and explanatory design
examples about the application of these reinforcements are also included.
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