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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 408 Abstracts search results
October 1, 2020
Ferrara, L.; Asensio, E.C.; Lo Monte, F.; Snoeck, D.; De Belie, N.
The design of building structures and infrastructures is mainly based on four concepts:
safety, serviceability, durability and sustainability. The latter is becoming increasingly
relevant in the field of civil engineering. Reinforced concrete structures are subjected to
conditions that produce cracks which, if not repaired, can lead to a rapid deterioration and
would result in increasing maintenance costs to guarantee the anticipated level of
performance. Therefore, self-healing concrete can be very useful in any type of structure, as it
allows to control and repair cracks as soon as they to occur.
As a matter of fact, the synergy between fibre-reinforced cementitious composites and selfhealing
techniques may result in promising solutions. Fibres improve the self-healing process
due to their capacity to restrict crack widths and enable multiple crack formation. In
particular, cracks smaller than 30-50 μm are able to heal completely. Moreover, in the case of
High Performance Fibre Reinforced Cementitious Composites (HPFRCC), high content of
cementitious/pozzolanic materials and low water-binder ratios are likely to make the
composites naturally conducive to self-healing.
In this framework the main goal of this paper is twofold.
On the one hand, a state-of-the-art survey on self-healing of fibre-reinforced cementitious
composites will be provided. This will be analysed with the goal of providing a “healable
crack opening based” design concept which could pave the way for the incorporation of
healing concepts into design approaches for FRC and also conventional R/C structures.
On the other hand, the same state-of-the-art will be instrumental in identifying research
needs, which still have to be addressed for the proper use of self-healing fibre-reinforced
cementitious composites in the construction field.
Ranjbarian, M.; Mechtcherine, V.
The structures subject to dynamic loading demand more ductile materials to prevent
catastrophic failure. The results of investigations on strain-hardening cement-based
composites (SHCCs) distinguished this group of materials – due to their highly ductile
behaviour – as a suitable alternative for structures with high resistance against seismic, impact
and cyclic loadings. While mechanical properties of SHCC are determined mostly by bridging
behaviour of dispersed fibres crossing cracks and properties of fibre-matrix interface, the
dependency of these mechanisms on the loading regime is pronounced. Specifically, under
cyclic loading, the number of cycles to failure decreases dramatically when SHCC is subject
to alternating tension-compression regime. Degradation of fibres compressed between the
crack faces and deterioration of their bridging capacity are responsible for such early failure
and necessitate further investigations at the micro level. The article at hand presents the
influence of loading history in cyclic tension-compression regime on the bridging capacity of
the single PVA microfibre embedded in cementitious matrix. A novel double-sided single
fibre pull-out setup is used for the experimental investigations. First the test setup, material
composition and testing procedure are explained. Next, the results of double-sided pull-out
specimens, tested under monotonic and cyclic tension-compression regimes, are discussed. It
is shown that the deterioration of fibre bridging capacity can be assessed by applying cyclic
loading in post-cracking stage, followed by pulling the fibre out of the matrix. Possibility of a
change in pull-out behaviour of PVA microfibre from “fibre rupture” to “fibre pullout”, also a
change of behaviour in post debonding regime from “hardening” to “softening” are also
observed. Eventually, the results of microscopic analysis are presented and discussed, which
show the specific phenomena responsible for changes in pull-out behaviour.
Antroula, G.; Stavroula, P.
With the advent of strain hardening fiber reinforced cementitious composites (SHFRCC) the
development of a new generation of structural systems that benefit from the inherent ductility
of concrete in tension in order to reduce the amounts of transverse reinforcement (stirrups),
shear strength, and tension-force development capacity to the main reinforcement is possible.
In this study a number of tests are conducted to explore the behavior of SHFRCC materials
under cyclic loads, simulating seismic effects. The experimental responses of two half-scale
interior beam column connections subjected to reversed cyclic loading are compared; one of
the connections was constructed with a cementitious matrix without fibers, and was detailed
according with the Eurocode provisions for ductility class M (moderate, μ=3.5). The other
connection was constructed with a SHFRCC mix; (2% by volume of PVA fibers was used to
reinforce the matrix and the minimum amount of shear reinforcement allowed by Eurocode 2
for non-seismic detailing was used in the specimens). Several supporting experiments were also
conducted to support analysis of the cyclic behavior (uniaxial tension, compression, splitting
tests). The behavior of the members under reversed cyclic displacement is also simulated with
advanced nonlinear Finite Element Analysis, with results that are correlated with the
experimental observations. The SHFRCC specimen with minimum detailing showed improved
performance and enormous ductility suggesting new possibilities to the seismic design of
Kitazawa, K.; Sato, Y.; Naganuma, K.; Kaneko, Y.
This paper attempts to investigate the effectiveness of Steel Chip Reinforced Polymer
Cementitious Composite (SCRPCC) to reduce the seismic drift of high rise building by
employing finite element method. Steel chips are produced when a steel plate is precisely
machined on a numerically controlled lathe. To verify the influence of drying shrinkage on the
structural performance of entire buildings, seismic response analyses of a 22-story RC wall
building subject to drying shrinkage cracking are conducted.
The analyzed building was damaged in 1985 Mexico Earthquake. In the analyses, drying
shrinkage is considered by conducting the drying shrinkage cracking analyses before dynamic
seismic vibration analyses to examine the influence of drying shrinkage. For each case of the
analyses, two kinds of materials are used; ordinary concrete and SCRPCC.
The shrinkage of 8,400-day drying period induces cracks in the walls of top floor as well as
the first floor. The maximum drift of the building is increased in the NS direction by the
shrinkage cracking while reduced in the EW direction. The maximum total drift of the building
during the seismic vibration is reduced by 3.5% in the NS direction and 8.9% in the EW
direction by using the SCRPCC instead of the ordinary concrete. The average crack width of
the building is reduced by 11.1% by the SCRPCC.
July 17, 2020
ACI Committees 441 – Reinforced Concrete Columns and 341A – Earthquake-Resistant Concrete Bridge Columns, Mohamed A. ElGawady
Columns are crucial structural elements in buildings and bridges. This Special Publication of the American Concrete Institute Committees 441 (Reinforced Concrete Columns) and 341A (Earthquake-Resistant Concrete Bridge Columns) presents the state-of-the-art on the structural performance of innovative bridge columns. The performance of columns incorporating high-performance materials such as ultra-high-performance concrete (UHPC), engineered cementitious composite (ECC), high-strength concrete, high-strength steel, and shape memory alloys is presented in this document. These materials are used in combination with conventional or advanced construction systems, such as using grouted rebar couplers, multi-hinge, and cross spirals. Such a combination improves the resiliency of reinforced concrete columns against natural and man-made disasters such as earthquakes and blast.
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