Research
involving
the
application
of
waste
materials
in
concrete
has
gained
prominence
academic
community,
aiming
to
promote
cleaner
management
while
enhancing
properties.
This
study
reviews
publications
that
have
assessed
influence
recycled
synthetic
fibers
on
concrete,
observing
improvements
their
main
The
analysis
results
reported
articles
revealed
that,
for
any
type
fiber,
there
is
a
significant
loss
workability
worsens
as
fiber
dosage
increases.
Additionally,
compressive,
flexural,
and
tensile
strengths
are
observed
up
2%
volume
added
concrete.
can
be
attributed
"bridging"
effect
caused
by
adhesion
friction
matrix,
delaying
initiation
propagation
cracks
microcracks
under
mechanical
stress
or
drying
shrinkage.
It
was
also
modulus
elasticity
not
significantly
affected.
Furthermore
demonstrated
performance
compatible
with
commercially
available
virgin
fibers,
indicating
they
serve
effective
replacements,
witch
contributes
mitigation
natural
resource
extraction,
energy
consumption,
CO2
generation
from
production
well
promoting
circular
economy.
Results in Engineering,
Год журнала:
2024,
Номер
23, С. 102520 - 102520
Опубликована: Июль 6, 2024
In
this
study,
plastic
waste
was
efficiently
converted
into
valuable
energy
resources
using
a
unique
pyrolysis
technique.
A
carbon-metal
oxide
hybrid
nanocomposite
introduced
as
catalyst,
and
analyses
of
structural
surface
morphology
were
conducted.
Pyrolysis
process
parameters
such
temperature
(PTemp),
time
(PTime),
catalyst
concentration
(CC)
optimized
through
response
methodology
for
higher
yield
resources.
Char
underwent
proximate
ultimate
analyses,
oil
physicochemical
Fourier
transform
infrared
syngas
composition
determined.
Optimal
conditions
found:
PTemp
300
°C,
PTime
60
min,
CC
1
%
char;
465
150
oil;
550
4
syngas.
Compared
to
the
ZSM-5
char,
oil,
yields
increased
by
7.9
%,
10.8
7.2
respectively,
at
optimum
conditions.
These
findings
suggest
that
can
effectively
meet
demands
with
enhanced
outputs.
Results in Engineering,
Год журнала:
2024,
Номер
21, С. 101825 - 101825
Опубликована: Янв. 30, 2024
In
recent
times,
there
has
been
a
substantial
increase
in
the
annual
use
of
plastics,
resulting
major
upward
trend.
As
result,
recycling
plastic
waste
become
global
issue.
The
present
research
aims
to
explore
feasibility
utilizing
Polyethylene
terephthalate
(PET)
as
possible
substitute
for
coarse
aggregate
concrete.
addition,
integration
Graphene
Nano-platelets
(GNPs)
into
concrete
mixture
was
conducted
using
different
quantities,
aiming
improve
its
structural
integrity.
study
employed
an
experimental
design
carry
out
examination.
PET
included
at
varied
ratios,
namely
0
%,
5
15
20
and
25
serving
additional
ingredient
alongside
aggregate.
Additionally,
GNPs
were
introduced
various
weight
percentages,
0.03
0.05
0.08
0.1
%.
A
series
mechanical
tests
performed
evaluate
properties
concrete,
including
compressive
strength
(CS),
split
tensile
(STS),
flexural
(FS),
modulus
elasticity
(MoE),
ultrasonic
pulse
velocity
(UPV).
assessment
concrete's
environmental
impact
by
analysing
carbon
content
evaluating
eco-efficiency
(ESE).
revealed
that
incorporation
%
replacement
aggregate,
together
with
inclusion
GNPs,
resulted
optimal
enhancement
CS,
STS,
FS,
MOE,
UPV
9
12.21
4.40
0.070
respectively.
Response
Surface
Methodology
(RSM)
models
developed,
mathematical
equations
generated
order
predict
expected
results.
optimization
process
all
carried
multi-objective
technique,
followed
subsequent
validation
process.
Advanced Composite Materials,
Год журнала:
2024,
Номер
33(6), С. 1101 - 1130
Опубликована: Фев. 24, 2024
This
study
investigates
the
integration
of
recycled
and
natural
fibers
with
concrete
aggregates
to
develop
environmentally
friendly
fiber-reinforced
(FRC),
a
primary
aim
maintaining
or
enhancing
its
properties.
Four
mixtures,
namely
plain
(C-Plain),
steel
(C-RSF),
plastic
(C-RPF),
kenaf
(C-KF),
were
formulated
analyzed
for
their
fresh,
hardened,
durability
characteristics.
A
50%
replacement
coarse
aggregates'
weight
(RCA)
was
implemented.
By
standardizing
fiber
volume
fractions
at
1.0%
all
FRC
evaluated
properties
such
as
workability,
dry
density,
ultrasonic
pulse
velocity
(UPV),
compressive
strength,
modulus
elasticity,
post-cracking
flexural
performance,
rupture,
toughness,
splitting
tensile
freeze-thaw
resistance
after
100
300
cycles.
Testing
involved
three
specimens
each
parameter
7
28
days.
The
results
indicated
positive
effects
on
incorporation
fibers.
Notably,
C-RSF
demonstrated
highest
strength
(46.63
MPa),
toughness
(64.35
kN-mm),
rupture
(7.46
MPa)
compared
other
composites.
Additionally,
it
exhibited
minimal
loss
(2.18%
3.07%)
cycles,
indicating
exceptional
durability.
superior
while
C-KF
showed
enhancement
slightly
below
that
C-RSF.
Although
not
reaching
level
C-RSF,
C-RPF
positively
influenced
performance.
Compressive
response
either
maintained
performance
marginal
reduction.
findings
carry
significant
implications
developing
conscious
construction
materials
enhanced
mechanical
properties,
thereby
advancing
sustainable
practices.
Results in Engineering,
Год журнала:
2023,
Номер
20, С. 101591 - 101591
Опубликована: Ноя. 21, 2023
With
an
emphasis
on
solid
waste-based
construction
materials,
this
study
seeks
to
provide
in-depth
analysis
of
current
advancements
in
CO2
curing
processes
for
building
materials.
715
publications
were
extracted
from
the
Web
Science
and
Scopus
databases
reviewed
following
systematic
review
guidelines
integrated
with
bibliometric
approach.
The
recent
operational
environmental
benefits
obtain
characteristics
optimal
materials
discussed.
findings
demonstrated
that
early-age
densifies
microstructure
lowering
porosity
enhancing
mechanical
properties,
impermeability,
durability.
Additionally,
carbonation
has
potential
enhance
performance
ash-based
concretes
as
well
physical
recycled
aggregates,
hence
promoting
waste
reutilization
sector.
Also,
conducted
studies
revealed
pre-
post-curing
conditions
are
critical
chamber
configuration.
Moreover,
exposure
time,
pressure
concentration,
all
directly
influenced
material
sequestration.
More
investigations
related
improving
long-term
products
still
required
methods
increasing
rate.
Results in Engineering,
Год журнала:
2023,
Номер
20, С. 101504 - 101504
Опубликована: Окт. 12, 2023
This
study
focused
on
analysing
the
seismic
fragility
and
retrofitting
of
reinforced
concrete
flexural
frames
using
strongback
braced
system.
Using
steel
system
as
a
means
seismically
strengthening
moment
(RCMFs),
this
research
aims
to
enhance
effectiveness
RCMFs.
In
study,
RCMFs
5-,
10-,
15-stories
are
designed
according
first
fourth
editions
Iran
Earthquake
Standard
2800.
The
edition
strengthened
SB
studied
structures
were
analyzed
under
incremental
static
loading
time
history
analysis.
results
show
that
yield
force
maximum
base
shear
for
with
edition,
compared
have
increased
by
1.28–1.42.
demonstrates
necessity
improving
constructed
edition.
Meanwhile,
retrofitted
braces
same
or
better
performance
than
newly
structures.
analysis
addition
strong
bracing
significantly
improves
brings
them
closer
4th
standards.
reduces
drift
ratio
between
floors
structural
damage.
