Buildings,
Journal Year:
2024,
Volume and Issue:
14(9), P. 2787 - 2787
Published: Sept. 4, 2024
Rubberized
cement-based
materials
are
widely
utilized
because
of
their
good
ductility,
impact
resistance,
and
fatigue
resistance.
This
research
investigated
the
effect
rubber
aggregates
content,
particle
size
aggregates,
water–cement
ratio
on
early-age
mechanical
properties
deformation
behaviors
mortar
through
laboratory
tests,
strength
reduction
coefficient
fitting
models
were
established
according
to
testing
results.
The
results
show
that
compressive
growth
rate
cement
is
about
15%
slower
than
flexural
strength.
existence
lowers
increase
mortar.
decreases
with
increasing
content
increases
age
Increasing
decreasing
aggregate
can
lower
autogenous
shrinkage
in
initial
stage,
but
later
stage
as
increases,
a
turning
point
between
30
h
50
h.
After
3
days,
dry
accounts
for
70–80%
total
shrinkage,
it
higher
smaller
ratios.
Construction and Building Materials,
Journal Year:
2024,
Volume and Issue:
443, P. 137619 - 137619
Published: Aug. 7, 2024
This
study
makes
a
significant
contribution
to
the
field
of
pervious
concrete
by
using
machine
learning
innovatively
predict
both
mechanical
and
hydraulic
performance.
Unlike
existing
methods
that
rely
on
labor-intensive
trial-and-error
experiments,
our
proposed
approach
leverages
multilayer
perceptron
network.
To
develop
this
approach,
we
compiled
comprehensive
dataset
comprising
271
sets
3,252
experimental
data
points.
Our
methodology
involved
evaluating
22,246
network
configurations,
employing
Monte
Carlo
cross-validation
over
20
iterations,
4
training
algorithms,
resulting
in
total
1,779,680
iterations.
results
an
optimized
model
integrates
diverse
mix
design
parameters,
enabling
accurate
predictions
permeability
compressive
strength
even
absence
data,
achieving
R²
values
0.97
0.98,
respectively.
Sensitivity
analyses
validate
model's
alignment
with
established
principles
behavior.
By
demonstrating
efficacy
as
complementary
tool
for
optimizing
designs,
research
not
only
addresses
current
methodological
limitations
but
also
lays
groundwork
more
efficient
effective
approaches
field.
Materials,
Journal Year:
2024,
Volume and Issue:
17(20), P. 4958 - 4958
Published: Oct. 11, 2024
An
investigation
was
conducted
to
assess
the
efficacy
of
using
waste
rubber
as
a
substitute
for
portion
an
aggregate
enhance
concrete’s
sustainability.
For
purpose
accomplishing
this
objective,
total
12
specimens
were
constructed
and
then
subjected
series
tests
investigate
their
bending
behavior.
The
samples
with
following
dimensions:
1000
mm
length
100
by
150
cross-sectional
area.
A
few
factors
selected,
including
impacts
longitudinal
reinforcement
ratio
ratio.
Based
on
volume
aggregates,
replacement
rates
0%,
5%,
10%,
15%
investigated
in
study.
To
beam
behavior,
stirrup
width
spacing
kept
constant
at
∅6/10.
composed
three
diameters:
∅6
top
(for
all
beams)
∅8,
∅10,
∅12
bottom.
experimental
results
demonstrated
that
effects
varying
amounts
tension
cracking
reinforced
concrete
beams
(RCBs)
varied.
findings
indicate
incorporation
into
reduction
both
load-carrying
capacity
level
deformation
material.
Additionally,
it
shown
amount
RCB
increased,
energy
absorption
ultimate
load
decreased.
There
dissipation
53.71%,
51.69%,
40.55%
∅8
when
applied
replacement,
respectively.
there
reductions
25.35%,
9.31%,
58.15%
38.69%,
57.79%,
62.44%
∅12,
Electronic Journal of Structural Engineering,
Journal Year:
2024,
Volume and Issue:
24(3), P. 1 - 7
Published: July 25, 2024
A
finite
element
model
(FEM)
was
created
with
the
aim
of
analyzing
behavior
steel
fiber
reinforced
recycled
concrete
(SFRRC)-filled
tube
columns
under
combined
cyclic
loading
and
monotonic
axial
load.
The
FEM
considered
effect
confinement
on
inner
loading.
numerical
described
in
detail,
a
focus
modeling
materials
involved
(normal
concrete,
SFRRC,
steel)
constitutive
-
without
considering
based
utilizing
damaged
plasticity
(CDP)
model.
core
interface
modeled
by
surface-to-surface
contact.
stress-strain
model,
confined
circular
tubes,
implemented,
validated
using
experimental
results
from
literature.
developed
various
parameters:
thickness,
volume
ratios
fibers,
besides
strengths
both
tube.
showed
great
similarity
to
under-
cyclic-
tested
columns.
indicated
that
confining
pressure
must
be
CDP
good
correlation
between
findings
obvious,
including
failure
modes,
hysteretic
curves
load-displacement.
Buildings,
Journal Year:
2024,
Volume and Issue:
14(8), P. 2468 - 2468
Published: Aug. 10, 2024
Rubber-foamed
concrete
demonstrates
exceptional
toughness,
a
low
elastic
modulus,
and
significant
sensitivity
to
density.
It
is
necessary
parameterize
the
density
mix
of
rubber-foaming
meet
engineering
design
requirements.
Density-mix
methods
for
foaming
rely
mainly
on
empirical
knowledge
or
trial-and-error
approaches.
In
this
paper,
with
numerous
parametric
tests
regression
analysis
based
general
principles
density-mix
designs
applicable
both
foamed
rubber-foamed
concretes,
key
parameters,
such
as
volume
correction
coefficient,
rubber
size
effect
water-reducing
agent
have
been
proposed
in
order
optimize
their
respective
densities
more
accurately.
The
demonstrated
an
optimal
water-to-cement
ratio
0.45,
corresponding
factor
1.027.
Incorporating
particles
agents
has
cement-paste
volume.
Controlling
fluidity
200
300
mm
range
crucial
when
designing
varying
densities.
equation
accurately
predicts
paste’s
measured
wetting
by
incorporating
corrections,
size,
water
reduction
coefficients.
By
employing
foam
excess
coefficient
1.1
mass
1.25,
dry
wet
error
less
than
5%.
A
comprehensive
framework
optimizing
terms
provided
applications
concrete,
facilitating
researchers
ratios
additional
novel
mixture-based
foamed-concrete
applications.
