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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 783 Abstracts search results
October 1, 2020
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.
Bernard, E. S.
Numerous investigations of the effect of fibre addition on the seismic performance of
conventionally reinforced concrete members have been published. These generally show that
fibres can improve robustness and survivability during reverse-cycle loading, but the dosage
rate of fibre required to achieve significant improvements in performance is substantial.
Recently, pure FRC members have increasingly been used in structures such as tunnel linings,
including both fibre reinforced shotcrete and pre-cast FRC segments. Concerns have been
raised about the absence of data on the seismic resistance of such members given that all
previous research on seismic performance has essentially involved hybrid members
incorporating both steel reinforcing bars and fibres.
The present investigation has focused on the reverse-cycle flexural performance of FRC
members in the absence of conventional steel reinforcing bars. Laboratory testing was
performed on plain, bar-reinforced, and steel fibre reinforced concrete members, and their
performance was compared. The tests indicate that steel fibres provide a small improvement
in flexural capacity under reverse-cycle loading compared to plain concrete, but that the
robustness of pure FRC members is relatively poor compared to steel bar-reinforced members
incorporating steel stirrups. The data suggest that, when used at practical dosage rates, large
hooked-end steel fibres cannot be relied upon to provide seismic performance in flexure
comparable to steel bar reinforced concrete members.
Javadian, A.; Mahdavi, A.; Benamrane, O. ;Majeed, M.; Aoude, H.
This study examines the effect of fiber properties, single fiber type and hybrid fibers on the
fresh-state and hardened-state properties of self-consolidating fiber-reinforced concrete
(SCFRC). As part of the study, 16 mixtures are examined with variables including the effect of
fiber type, length, aspect ratio, and hybrid use of fibers (short and long fibers). Properties in the
fresh state are studied using standard SCC tests including: slump flow, V-funnel and visual
stability index (VSI) tests. Mechanical properties are studied by testing prisms under four-point
flexural loading in accordance with the ASTM C1609 standard. The results demonstrate that
self-consolidating FRC mixtures are possible at moderate fiber contents, however, once the
limiting fiber contents are exceeded workability and mix uniformity are lost. The results also
show the effects of fiber content, fiber type, fiber properties and hybrid fibers on the flexural
toughness of SCFRC.
Chelha, F.; Alam, S. Y.; Bendimerad, A.Z.; Loukili, A.
Self-compacting mortars and concretes for horizontal structures are cementitious mixtures
that are both fluid and homogeneous, with the particularity of flowing under the effect of their
own weight. Thanks to their homogeneous texture they offer the possibility of achieving good
quality of finishing and many such advantages become the reason for their applications
especially in slabs and floors.
However, self-compacting mortars or concretes show considerable shrinkage and cracking
problems when used in floors and slabs (Weiss et al., 1998). Because of their large moisture
exchange surfaces, the floor screeds are subjected to significant drying effects and in
particular plastic shrinkage. If the movements are restrained, the risk of cracking is high. In
this respect the use of fibers is a good alternative to using reinforcement bars and welded wire
mesh. Indeed on site a clear decrease in cracking caused mainly by the shrinkage can be
observed as soon as the fibers are incorporated in the screed.
This study is conducted to demonstrate the effectiveness and the effects of glass fibers on
the control of cracking phenomena due to shrinkage by determining their mechanisms of
action at young age. The study is carried out in two parts: Firstly, free shrinkage behavior is
analyzed in the fiber reinforced floor screed. Secondly, the restrained behavior at young ages
using recently developed uni-axial tensile testing machine is investigated.
Juhasz, K.P.; Schaul, P.; Winterberg, R.
The design of fibre reinforced shotcrete (FRS) hard rock linings is commonly based on the
Q-System or Barton charts. This performance based design approach assess the results of
experimental tests, carried out on panel specimens according to existing standards or
guidelines. This is different to the general methodology to assess and determine the
performance of fibre reinforced concrete (FRC) using standardized beam tests.
Panel and beam test results yield significantly different information on the performance of
FRC and it is problematic to correlate them. The beam test yields a stress-strain relationship
for a small displacement range only. Based on the significantly different working and failure
mechanisms, structural tests to evaluate the post-crack performance and the ductility of FRS
linings are typically conducted on different types of panels rather than on traditional beams.
As a consequence, test results based on beam tests may lead to an overestimation of FRC
performance in panels and vice versa. In order to avoid uneconomic designs the most
appropriate material must be found using the most appropriate test methodology.
This paper discusses the difficulty in correlating test results obtained from beams and
panels as well as the discrepancy in performance of different FRC using different test
methodologies and aims to provide guidance on materials, testing and design.
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