As
one
of
the
world’s
most
fragile
and
sensitive
ecological
regions,
Xizang
risks
significant
environmental
damage
from
using
traditional
materials,
including
cement
lime,
to
improve
reinforce
loose
accumulated
sandy
soil
slopes.
To
address
this
issue,
study
utilized
a
low-concentration
biodegradable
polyvinyl
alcohol
(PVA)
solution
combined
with
sisal
fibers
(SFs)
stabilize
sand
in
southeastern
Xizang.
A
series
physical,
mechanical,
microscopic
analyses
was
conducted
evaluate
properties
treated
sand.
The
results
indicated
following.
1)
stress-strain
curves
improved
samples
exhibited
an
elastic-plastic
relationship.
Failure
observed
two
stages.
At
strain
3%
or
less,
demonstrated
elastic
deformation
linear
increase
stress,
whereas
deviator
stress
increased
rapidly
linearly
axial
strain.
Once
exceeded
3%,
became
plastic
nonlinear
relationship,
growth
rate
gradually
decreased
leveled
off.
2)
Under
varying
confining
pressure
conditions,
relationship
curve
between
maximum
(σ
1
-σ
3
)
max
∼σ
for
both
untreated
PVA
solution,
fiber
approximately
linear.
3)
SFs
created
skeletal-like
network
that
encased
particles,
hydroxyl
functional
groups
molecules
bonded
particles
surface,
thereby
enhancing
interfacial
properties.
This
interaction
resulted
tighter
connection
SFs,
which
stability
structure.
4)
incorporation
significantly
enhanced
mechanical
strength
resistance
soil.
optimal
ratio
S
P
=
L
15
mm,
cohesion
24.54
kPa
196.03
kPa.
These
findings
could
be
applied
engineering
practices
slopes
provide
theoretical
basis
such
applications.
Polymers,
Год журнала:
2025,
Номер
17(2), С. 151 - 151
Опубликована: Янв. 9, 2025
Civil
and
geotechnical
researchers
are
searching
for
economical
alternatives
to
replace
traditional
soil
stabilizers
such
as
cement,
which
have
negative
impacts
on
the
environment.
Chitosan
biopolymer
has
shown
its
capacity
efficiently
minimize
erosion,
reduce
hydraulic
conductivity,
adsorb
heavy
metals
in
that
is
contaminated.
This
research
used
unconfined
compression
strength
(UCS)
investigate
impact
of
chitosan
content,
long-term
assessment,
acid
concentration,
temperature
improvement
strength.
Static
triaxial
testing
was
employed
evaluate
shear
treated
soil.
Overall,
goal
identify
optimum
values
mentioned
variables
so
highest
potential
chitosan-treated
can
be
obtained
applied
future
well
large-scale
applications
engineering.
The
UCS
results
show
increased
over
time
at
high
temperatures.
Depending
type,
a
curing
between
45
65
°C
considered
optimal.
not
soluble
water,
an
solution
needed
dissolve
biopolymer.
Different
ranges
were
investigated
find
appropriate
amount.
when
concentration
reached
optimal
level,
0.5-1%.
A
detailed
chemical
model
developed
express
how
affect
properties
biopolymer-treated
SEM
examination
findings
demonstrate
covered
particles
filled
void
spaces.
strengthened
by
formation
hydrogen
bonds
electrostatic
interactions
with
particles.
Polymers,
Год журнала:
2024,
Номер
16(11), С. 1586 - 1586
Опубликована: Июнь 3, 2024
The
freeze-drying
of
biopolymers
presents
a
fresh
option
with
greater
potential
for
application
in
soil
subgrade
stabilization.
A
freeze-dried
combination
β-glucan
(BG)
and
γ-poly-glutamic
acid
(GPA)
was
used
to
treat
low
compressible
clay
(CL)
silt
(ML)
soils
dosages
0.5%,
1%,
1.5%,
2%.
California
bearing
ratio
(CBR)
test
the
treated
specimens
performed
under
three
curing
conditions:
(i)
thermal
at
60
°C,
(ii)
air-curing
seven
days
followed
by
submergence
4
days,
(iii)
no
curing,
i.e.,
tested
immediately
after
mixing.
To
investigate
influence
shear
strength
on
biopolymer-stabilized
their
variations
aging,
unconfined
compressive
(UCS)
tests
were
conducted
°C
3
7
21
air
curing.
maximum
CBR
125.3%
observed
thermally
cured
CL
minimum
6.1%
soaked
conditions
ML
soils.
Scanning
electron
microscopy
(SEM),
infrared
spectroscopy,
average
particle
size,
permeability,
adsorption
revealed
pore
filling,
biopolymer
coating
surface,
agglomeration
along
presence
hydrogen
bonds,
covalent
amide
Van
der
Waals
forces
that
contributed
stiffening
stabilized
soil.
Using
three-dimensional
(3D)
finite
element
analysis
(FEA)
layered
elastic
(LEA),
mechanistic–empirical
pavement
design
carried
out
thickness
catalog
prepared
CBR.
cost
reductions
1
km
section
expected
be
12.5%.
