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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 84 Abstracts search results
October 1, 2020
Meda, A.; Rinaldi, Z.; Spagnuolo, S.; De Rivaz, B.; Giamundo, N.
The interest in using fiber reinforced concrete (FRC) for the production of precast
segments in tunnel lining, installed with Tunnel Boring Machines (TBMs), is continuously
growing, as witnessed by the studies available in literature and by the actual applications. The
possibility of adopting a hybrid solution of FRC tunnel segments with Glass Fiber Reinforced
Polymer (GFRP) reinforcement is investigated herein. Full-scale tests were carried out on
FRC segments with and without GFRP cage, with a typical geometry of metro tunnels. In
particular, both flexural and point load full-scale tests were carried out, for the evaluation of
the structural performances (both in terms of structural capacity and crack pattern evolution)
under bending, and under the TBM thrust. Finally, the obtained results are compared, in order
to judge the effectiveness of the proposed technical solution.
Trabucchi, I.; Conforti, A.; Tiberti, G.; Plizzari, G.A.; Winterberg, R.
The use of fiber reinforced concrete in tunnel linings, with or without conventional rebars,
has increased in the two last decades, especially in segmental linings. In the meanwhile, in the
scientific community there was a growing interest on macro-synthetic fibers for use in
underground structures. Within this framework, the present study investigates the possibility
of using macro-synthetic fiber reinforcement in precast tunnel segments by means of a
Firstly, an experimental program based on three point bending tests was carried out on
polypropylene fiber reinforced concretes (PFRCs) characterized by different fiber contents in
order to assess their post-cracking residual strength. Secondly, the corresponding stress vs.
crack opening laws, representative of the PFRCs investigated, were calculated through
inverse analysis procedure. Then, a segment of a typical tunnel lining having small diameter
was adopted as reference to optimize the reinforcement solution (macro-synthetic fibers and
conventional rebars, i.e. hybrid solution) and to study its structural behavior by numerical
analyses. Particular attention was devoted to the Tunnel Boring Machine (TBM) thrust jack
phase, in which the TBM moves forward by pushing the thrust jacks on the bearing pads of
the latest assembled ring, introducing high-concentrated forces in the lining.
Pourzarabi, A.; Colombo, M.; Martinelli, P.; di Prisco, M.
Fibre reinforced concrete (FRC) material is characterized by a high intrinsic scatter in the
results when tested according to standard notched beams. However, it is observed that structures
affected by a high stress redistribution show a significantly reduced scatter in their structural
behaviour. Therefore, the use of the characteristic material constitutive parameters from a
standard test leads to overly conservative design. The Model Code 2010 has introduced a
coefficient, named structural redistribution factor, that is able to take into account a reduced
variability of the structural response, when compared to that identified from a standard material
The paper investigates the behaviour of FRC slabs to highlight the difference in structural
response of FRC elements with respect to the expected response computed according to the
standard specimens used for material characterization. To this aim, FRC slabs of 2×2 m, 15 cm
thick, supported on four points at the mid-span of each side, are tested under a point load.
Different slab solutions (R/C, FRC only and a Hybrid solution with FRC and steel rebars) are
compared and discussed. The material considered can be classified as 5b according to Model
Code 2010. A yield line approach is also adopted to validate the formulation proposed by Model
Code 2010 for the structural redistribution factor in the cases investigated.
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.
Conforti, A.; Trabucchi, I.; Tiberti, G.; Plizzari, G.A.; Caratelli, A; Meda, A.; Moro, S.; Hunger, M.
There is a growing interest in the scientific community on the structural applicability of
polypropylene macrofibers without or in combination with conventional reinforcement as
spread reinforcement for precast tunnel segmental linings. Polypropylene macrofibers could
be used in precast tunnel segments as shear reinforcement and for withstanding splitting and
spalling tensile stresses which occur under and between Tunnel Boring Machine (TBM) rams,
respectively. Fibers could also simplify and speed up the tunnel element production process.
In this context, the present study investigates the possibility of using polypropylene
macrofiber reinforcement in precast tunnel segments for both hydraulic and metro tunnel
linings. Four full-scale segments (two counter-key segments of a hydraulic tunnel and two
trapezoidal shaped segments of a metro tunnel) were experimentally evaluated under point
load test. The latter simulate the TBM actions on segments during the excavation process
(TBM thrust jack phase), which is generally the most critical temporary loading condition for
segments. Two reinforcement solutions were studied: a typical conventional reinforcement
(reference samples) and a combination of polypropylene macrofibers and conventional
reinforcement (hybrid solution). Polypropylene macrofibers were observed to be very
effective in combination with conventional reinforcement, underlining the fibers ability in
controlling both splitting and spalling phenomena.
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