International Journal of Sustainable Engineering,
Journal Year:
2024,
Volume and Issue:
17(1), P. 1066 - 1082
Published: Nov. 27, 2024
The
disposal
of
biomedical
waste
(BMW)
ash
presents
a
growing
environmental
concern
due
to
its
potential
contaminate
ecosystems
and
causes
health
hazards.
This
study
explores
an
innovative
solution
by
utilising
BMW
as
sustainable
stabiliser
enhance
the
geotechnical
properties
soft
soil,
which
exhibits
low
strength
high
plasticity
characteristics.
Through
application
Taguchi
method,
influence
concentration
curing
period
on
soil
such
compaction,
pH,
electrical
conductivity,
unconfined
compressive
(UCS)
were
evaluated.
experimental
results
show
that
adding
significantly
reduces
increases
UCS,
achieving
gain
more
than
180
kPa
within
14
days.
optimal
combination
was
determined
be
20%
with
14-day
period.
Analysis
variance
(ANOVA)
revealed
time
is
dominant
factor,
contributing
90.86%
early
development.
Microstructural
analysis
using
SEM
EDX
further
reveals
formation
ettringite,
promotes
gain.
research
demonstrates
dual
benefits
in
mitigating
while
improving
performance,
offering
viable
for
both
management
stabilisation
challenges.
Construction and Building Materials,
Journal Year:
2024,
Volume and Issue:
433, P. 136696 - 136696
Published: May 23, 2024
Phosphogypsum,
a
byproduct
generated
during
the
production
of
chemical
fertilizers,
can
pose
significant
environmental
threat
when
not
managed
appropriately.
This
study
endeavors
to
explore
potential
repurposing
phosphogypsum
by
incorporating
it
into
cement-stabilized
base
asphalt
concrete
pavement.
We
conducted
an
in-depth
optimized
scheme
using
specific
engineering
project
as
case
study.
substitutes
for
part
cement
in
original
base,
creating
mixed
material
(CSPM)
road
construction.
The
primary
aim
is
assess
energy
consumption,
carbon
emissions,
and
implications
throughout
various
construction
phases
within
life
cycle
assessment
(LCA).
Additionally,
sensitivity
analysis
scrutinize
influence
underlying
layer,
layer
thickness
transport
distance
on
consumption
emissions.
results
indicate
noteworthy
reduction,
showing
42.5%
decrease
12.7%
Moreover,
crushed
stone
(CS)
milling
planer
(MPM)
have
greatest
impact
transportation
stage.
Notably,
phase
yields
most
substantial
benefits,
demonstrating
48.0%
67.5%
facilitates
reuse
reclaimed
pavement
(RAP)
materials
phosphogypsum,
resulting
44.3%
reduction
mineral
usage,
6.9%
petroleum
asphalt,
preventing
16.859
square
meters
waste
occupancy.
Applied Sciences,
Journal Year:
2025,
Volume and Issue:
15(1), P. 347 - 347
Published: Jan. 1, 2025
(1)
Background:
The
construction
industry
continuously
seeks
sustainable
alternatives
to
traditional
materials
for
subgrade
material
in
pavement
construction,
aiming
mitigate
environmental
impact
while
maintaining
performance
standards.
This
study
investigates
the
feasibility
of
incorporating
phosphogypsum
(PG)
and
contaminated
sediment
into
materials,
focusing
on
their
physico-chemical
physico-mechanical
properties.
(2)
Methods:
properties,
performance,
mechanisms
solidified
with
(3%
5%
mixture)
were
studied
using
long-term
leaching
tests
(ANS
16.1),
uniaxial
compressive
strength
(UCS),
California
Bearing
Ratio
(CBR),
X-ray
fluorescence
(XRF),
thermogravimetric
analysis
(TGA).
(3)
Results:
Based
pseudo-total
metal
content
(Cr,
Ni,
Cu,
Zn,
As,
Cd,
Pb),
is
classified
as
third-
fourth-class,
indicating
it
polluted
requires
treatment
before
disposal
environment.
To
assess
behavior
treated
(S/S),
a
semi-dynamic
ANS
16.1
test
was
performed.
results
showed
that
metals
exhibit
moderate
mobility,
average
diffusion
coefficients
(De)
ranging
from
10−8
cm2/s
Zn
(in
both
mixtures)
10−12
Cr
mixture
F-3).
index
(LX)
values
mixtures
above
9
most
metals,
confirming
suitability
“controlled”
use.
Granulometric
indicated
predominance
fine
particles,
which
enhances
material’s
plasticity
mechanical
Atterberg
consistency
increasing
improved
Liquid
Limit
Plastic
Index.
However,
UCS
neither
3%
nor
met
minimum
requirements
material.
On
other
hand,
CBR
demonstrated
promising
12.5%
22.9%
mixture.
Overall,
positively
influenced
development
sediment-PG
mixtures,
confirmed
by
XRF
TGA
analyses.
(4)
Conclusions:
Environmental
considerations,
such
leachability
contaminants,
investigated
ensure
sustainability
proposed
materials.
Leaching
minimal
pollutant
release,
suggesting
potential
safe
utilization
PG
provides
valuable
insights
properties
mixes
sediment,
supporting
these
alternative
offering
viable
solution
waste
generation
enhancing
performance.
