International Journal of Applied Ceramic Technology,
Год журнала:
2024,
Номер
unknown
Опубликована: Сен. 28, 2024
Abstract
Solid
waste
recycling
plays
a
crucial
role
in
environmental
protection
and
energy
conservation.
This
study
explores
the
impact
of
modulus
alkaline
activator
on
dry
density,
water
absorption
rate,
thermal
conductivity,
electromagnetic
wave
absorption,
compressive
flexural
strength
rice
husk
ash
(RHA)‐foamed
composites.
Additionally,
foamed
composite's
micropore
structure
hydration
characteristics
were
characterized.
For
first
time,
reveals
correlation
between
pore
structure,
products,
hardening
properties
alkali‐activated
RHA‐foamed
The
found
that
decreasing
increased
amount
OH
−
ions
available
gel,
number
micropores
(
r
≤
.1
µm)
composites
from
7.1903%
to
21.3156%.
resulted
refinement
sizes
optimization
heat
transfer
paths.
Meanwhile,
increasing
C–S–H
gel
composition
hydrated
products
improved
its
strength.
When
alkali
reaches
1,
28
days
display
8.33
MPa
conductivity
.1404
W/(m·K).
Furthermore,
superior
composites,
yielding
reflection
loss
value
−12.02
dB.
Structural Concrete,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 20, 2025
Abstract
This
study
investigates
the
effects
of
reclaimed
asphalt
pavement
(RAP)
aggregates
and
silica
fume
(SF)
on
mechanical,
durability,
microstructural
properties
fly
ash
(FA)‐based
geopolymer
composites
(GC)
under
varying
curing
conditions.
GCs
were
prepared
with
RAP
contents
0%,
15%,
30%,
60%
as
replacements
for
river
aggregate
(RA)
partial
replacement
FA
by
15%
SF.
Samples
cured
at
60°C
90°C,
their
performance
was
evaluated
through
compressive
flexural
strength
tests,
freeze–thaw
(F‐T)
resistance,
high‐temperature
exposure,
sorptivity,
porosity,
analysis.
The
results
reveal
that
substituting
RA
demonstrated
optimal
content
enhancing
strength,
increases
33.64%
8.04%
90°C.
At
30%
RAP,
improvements
smaller
(7.36%
7.37%
90°C),
while
led
to
reductions
0.97%
8.12%
respectively.
mixture
containing
100%
a
best
performance,
exhibiting
lowest
loss
750°C.
after
50
F‐T
cycles
observed
in
90°C
FA.
Mixtures
exhibited
cycles,
demonstrating
enhanced
durability.
superior
incorporation
compared
reference
without
irrespective
temperature.
highest
resistance
elevated
temperatures,
minimal
However,
increasing
greater
deterioration
due
thermal
degradation
bitumen‐coated
aggregates.
Replacing
SF
significantly
reduced
causing
over
90%
Energies,
Год журнала:
2024,
Номер
17(22), С. 5535 - 5535
Опубликована: Ноя. 6, 2024
The
European
Climate
Law
mandates
a
55%
reduction
in
CO2
emissions
by
2030,
intending
to
achieve
climate
neutrality
2050.
To
meet
these
targets,
there
is
strong
focus
on
reducing
energy
consumption
buildings,
particularly
for
heating
and
cooling,
which
are
the
primary
drivers
of
use
greenhouse
gas
emissions.
As
result,
demand
energy-efficient
sustainable
buildings
increasing,
thermal
insulation
plays
crucial
role
minimizing
both
winter
summer
cooling.
This
review
explores
historical
development
materials,
beginning
with
natural
options
such
as
straw,
wool,
clay,
progressing
materials
like
cork,
asbestos,
mineral
culminating
synthetic
insulators
fiberglass
polystyrene.
also
examines
innovative
polyurethane
foam,
vacuum
panels,
cement
foams
enhanced
phase
change
materials.
Additionally,
it
highlights
renewed
interest
environmentally
friendly
cellulose,
hemp,
sheep
wool.
current
challenges
developing
sustainable,
high-performance
building
solutions
discussed,
including
implementation
6R
principles
insulating
Finally,
not
only
traces
evolution
but
provides
various
classifications
summarizes
emerging
aspects
field.
