Biogeotechnics,
Journal Year:
2023,
Volume and Issue:
1(3), P. 100036 - 100036
Published: Aug. 24, 2023
The
aim
of
this
study
is
to
disclose
the
feasibility
improving
thermal
conductivity
and
mechanical
strength
quartz
sand
mixed
with
steel
slag
treated
by
enzyme-induced
carbonate
precipitation
(EICP).
In
work,
effect
content
(SSC)
number
treatment
cycle
(N)
on
EICP-treated
specimens
were
investigated.
immersion
method
was
adopted
for
specimen
preparation.
measured
transient
plane
source
(TPS)
unconfined
compressive
(UCS)
obtained
through
a
uniaxial
compression
test.
Moreover,
SEM
test
conducted
obtain
morphology
deposition
characteristics
calcium
crystals.
result
shows
that
UCS
sands
increase
before
decreasing,
as
SSC
increases.
Consequently,
maximum
values
are
1.28
W/(m⊡K)
6.31
MPa,
respectively,
corresponding
optimal
parameter
20%
at
12
N.
367%
137%,
compared
no
addition
slag.
analysis
indicates
spherical
exists
in
range
0-20%
SSC,
whereas
there
mainly
amorphous
when
varies
from
40%
80%.
It
also
demonstrates
more
sensitive
variation
than
conductivity.
Journal of Rock Mechanics and Geotechnical Engineering,
Journal Year:
2024,
Volume and Issue:
unknown
Published: July 1, 2024
The
application
of
microbially
induced
carbonate
precipitation
(MICP)
in
clayey
soils
has
attracted
much
attention,
and
many
studies
used
clay
as
an
additive
to
enhance
microbial
mineralization
efficiency
sandy
soils.
Within
the
sand-clay-bacteria-calcite
system,
property
content
play
crucial
roles
affecting
bacterial
growth
calcite
formation.
More
important,
bentonite
is
particularly
sensitive
changes
geochemical
environment.
In
this
study,
sand-bentonite
mixtures
were
treated
by
biostimulated
MICP,
aiming
provide
insights
into
behavior
system.
activity
cementation
pattern
at
different
contents
evaluated
through
a
series
tests
such
enrichment
tests,
unconfined
compressive
strength
(UCS)
measurements,
mercury
intrusion
porosimetry
(MIP)
scanning
electron
microscopy
(SEM)
observations,
energy
dispersive
X-ray
spectroscopy
(EDS)
analyses.
findings
showed
that
presence
promoted
indigenous
ureolytic
bacteria,
with
lower
levels
enhancing
activity.
Macroscopic
microscopic
characterization
indicated
bentonite-coating
sand
structure
was
more
conducive
formation
large-sized
crystals
capable
cementing
soil
particles
compared
sand-supported
bentonite-supported
structures.
Additionally,
excessive
calcium
ions
(Ca2+)
concentrations
cementitious
solution
would
lead
predominant
deposition
on
particle
surfaces,
contributing
minimally
improvement.
Biogeotechnics,
Journal Year:
2023,
Volume and Issue:
1(3), P. 100036 - 100036
Published: Aug. 24, 2023
The
aim
of
this
study
is
to
disclose
the
feasibility
improving
thermal
conductivity
and
mechanical
strength
quartz
sand
mixed
with
steel
slag
treated
by
enzyme-induced
carbonate
precipitation
(EICP).
In
work,
effect
content
(SSC)
number
treatment
cycle
(N)
on
EICP-treated
specimens
were
investigated.
immersion
method
was
adopted
for
specimen
preparation.
measured
transient
plane
source
(TPS)
unconfined
compressive
(UCS)
obtained
through
a
uniaxial
compression
test.
Moreover,
SEM
test
conducted
obtain
morphology
deposition
characteristics
calcium
crystals.
result
shows
that
UCS
sands
increase
before
decreasing,
as
SSC
increases.
Consequently,
maximum
values
are
1.28
W/(m⊡K)
6.31
MPa,
respectively,
corresponding
optimal
parameter
20%
at
12
N.
367%
137%,
compared
no
addition
slag.
analysis
indicates
spherical
exists
in
range
0-20%
SSC,
whereas
there
mainly
amorphous
when
varies
from
40%
80%.
It
also
demonstrates
more
sensitive
variation
than
conductivity.
