Journal of Cleaner Production,
Journal Year:
2023,
Volume and Issue:
419, P. 138205 - 138205
Published: July 21, 2023
The
decomposition
of
organic
waste
going
to
landfills
produces
methane
gas,
which
is
21
times
worse
than
CO2
in
its
global
warming
potential.
Spent
coffee
grounds
(SCG)
are
one
type
that
makes
up
a
significant
proportion
the
landfills.
Therefore,
it
becomes
imperative
look
for
recycling
solution
transform
this
into
valuable
resource.
concrete
industry
has
potential
contribute
significantly
increasing
rate
material.
However,
due
high
content,
unsuitable
be
used
directly
structural
concrete.
experimental
project
looks
at
pyrolysing
different
temperatures
(350
and
500
°C)
identify
suitability
improving
physicochemical
mechanical
properties
raw
pyrolysed
forms
SCG
were
as
replacement
fine
aggregates
(FA;
sand)
5,
10,
15
20%
volume
levels.
X-ray
fluorescence
(XRF),
Carbon,
Hydrogen,
Nitrogen,
Sulfur
(CHNS)
analysis,
laser
diffraction
particle
size
(XRD),
scanning
electron
microscopy
(SEM)
compressive
strength
tests
undertaken
investigate
material
their
performance
blended
composites.
results
show
leaching
compounds
from
hinders
hydration
reaction
cement
particles,
thereby
hampering
SCG-blended
350
°C
led
improvement
properties,
resulted
29.3%
enhancement
composite
with
biochar.
Resources Conservation and Recycling,
Journal Year:
2024,
Volume and Issue:
204, P. 107533 - 107533
Published: March 5, 2024
Brown
coal
fly
ash
(BCFA)
is
a
lower-quality
type
of
produced
through
brown
combustion,
and
its
disposal
in
landfills
raises
environmental
concerns.
This
study,
for
the
first
time,
evaluates
feasibility
using
BCFA
stabilising
expansive
clay
subgrade
pavement
construction.
Various
engineering
tests
were
conducted,
including
unconfined
compressive
strength
(UCS),
repeated
load
triaxial
(RLT),
soaked
California
bearing
ratio
(CBR),
direct
shear,
shrink-swell
tests.
The
results
indicated
that
adding
increased
UCS,
resilient
modulus,
CBR,
cohesion
while
reducing
shrinkage-swell
index
shrinkage/swell
strain.
highest
modulus
(82.52
MPa)
CBR
(3.41
%)
achieved
with
3
%
content.
These
findings
recommend
as
optimum
content
subgrade.
research
fills
gap
by
assessing
application
soil,
providing
insights
sustainable
utilisation
this
abundant
waste
material
Cold Regions Science and Technology,
Journal Year:
2023,
Volume and Issue:
214, P. 103957 - 103957
Published: July 13, 2023
The
freeze-thaw
(F-T)
cycle
is
a
common
weathering
process
that
often
occurs
in
cold
climates,
and
it
can
deteriorate
the
mechanical
performance
of
subgrade
soil,
leading
to
pavement
failure
economic
loss.
Plastic
wastes
have
been
adopted
as
soil
reinforcement
element
improve
geotechnical
properties
stability
expansive
clay
soils
used
material.
Previous
research
has
mainly
focused
on
application
polyethylene
terephthalate
(PET)
plastic
waste
under
ambient
temperature,
but
few
studies
investigated
reinforced
with
PET
conditions
for
application.
Moreover,
there
lack
knowledge
dynamic
clays
modified
plastics
exposed
F-T
process.
This
study
conducted
series
experiments,
including
repeated
load
triaxial
tests
unconfined
compressive
strength
tests,
first
time
investigate
different
percentages
strips
(i.e.,
0,
1,
1.5,
2%
by
weight
dry
soil)
after
being
2,
5,
8
cycles.
experimental
results
showed
significantly
reduced
resilient
modulus.
However,
modulus
strips-reinforced
samples
were
higher
than
those
unreinforced
optimum
content
was
found
be
1%
exhibited
highest
stiffness
various
Road Materials and Pavement Design,
Journal Year:
2024,
Volume and Issue:
25(11), P. 2436 - 2459
Published: Feb. 27, 2024
The
construction
sector
has
undergone
significant
reforms
towards
increased
sustainability
in
recent
decades.
Therefore,
there
been
a
great
interest
developing
alternative
binders
for
stabilising
expansive
clay
subgrades
and
improving
their
mechanical
properties
while
mitigating
swelling
shrinking
behaviour.
One
such
binder
is
vinyl
acetate-ethylene
(VAE)
polymers.
However,
are
only
few
studies
on
utilising
polymers,
especially
VAE
stabilisation.
Specifically,
lack
of
research
using
polymer-stabilised
clays
road
subgrade
purposes.
This
study
aims
to
address
this
knowledge
gap
by
evaluating
the
potential
solid
powder
polymer
stabilise
through
comprehensive
series
tests
as
well
physicochemical
microstructural
analyses.
results
experiments
provide
evidence
that
introduction
considerably
improved
strength
swell
shrinkage
behaviour
clay.
