Materials,
Год журнала:
2024,
Номер
17(24), С. 6280 - 6280
Опубликована: Дек. 22, 2024
Industrial
and
construction
wastes
make
up
about
half
of
all
world
wastes.
In
order
to
reduce
their
negative
impact
on
the
environment,
it
is
possible
use
part
them
for
concrete
production.
Using
experimental–statistical
modeling
techniques,
combined
effect
brick
powder,
recycling
sand,
alkaline
activator
fresh
hardened
properties
self-compacting
production
textile-reinforced
was
investigated.
Experimental
data
flowability,
passing
ability,
spreading
speed,
segregation
resistance,
air
content,
density
mixtures
were
obtained.
The
standard
ability
tests
modified
using
a
textile
mesh
maximize
approximation
real
conditions
To
determine
dynamics
strength
development,
compression
flexural
at
ages
1,
3,
7,
28
days
splitting
tensile
conducted.
preparation
technology
investigated
depending
composition
presented.
resulting
mathematical
models
allow
optimization
compositions
partial
replacement
slag
cement
with
powder
(up
30%),
natural
sand
recycled
100%)
addition
an
in
range
0.5–1%
content.
This
allows
us
obtain
sustainable,
alkali-activated
high-strength
concrete,
which
significantly
reduces
environment
promotes
development
circular
economy
industry.
Buildings,
Год журнала:
2024,
Номер
14(7), С. 2204 - 2204
Опубликована: Июль 17, 2024
Significant
construction
and
demolition
waste
(CDW)
is
produced
by
many
useless
concrete
buildings,
bridges,
airports,
highways,
railways,
industrial
mining,
etc.
The
rising
need
for
new
has
increased
the
use
of
natural
materials,
impacting
ecosystem
incurring
high
costs
from
mining
aggregates
(NA)
processing
CDW.
concept
implementation
recycled
aggregate
(RAC)
offer
a
sustainable
solution
industry.
Crushed
concrete,
made
can
be
used
instead
in
structural
concrete.
This
byproduct,
(RCA),
potential
to
replace
aggregate.
paper
examines
benefits
RAC
economic,
social,
environmental,
technological
perspectives
discusses
replacement
ratio
(RR)—the
weight
percentage
replaced
aggregate—which
crucial
performance.
A
collection
data
on
mechanical
properties
economic
performance,
national
specifications,
standards,
guidelines
reviewed
determine
optimal
RCA,
which
was
found
20%.
Finally,
we
discuss
challenges
future
using
Case Studies in Construction Materials,
Год журнала:
2024,
Номер
20, С. e03328 - e03328
Опубликована: Май 22, 2024
A
series
of
compression-shear
tests
were
carried
out
to
investigate
the
shear
failure
sustainable
recycled
aggregate
concrete,
and
surfaces
scanned
by
a
3D
laser
scanner.
The
effect
coarse
(RCA)
replacement
rates
normal
stresses
on
strength,
mode,
fracture
morphology
analyzed.
Meanwhile,
discrete
element
method
was
used
study
behaviors
at
mesoscale.
Finally,
carbon
emission
calculated
evaluate
RCA
environment.
result
shows
that
cohesion
c,
internal
friction
angle
φ
all
decrease
as
rate
increases.
damage
RAC
can
be
aggravated
increasing
rate.
Fractal
dimension
joint
roughness
coefficient
surface
tend
increase
with
stress.
In
addition,
more
microcracks
found
in
rate,
stress
cause
microcracks.
Given
nonlinear
development
stress-displacement,
modified
constitutive
model
is
proposed.
total
emissions
concrete
are
considering
production,
transportation,
construction,
100%
10.2%
less
than
natural
concrete.
