Frontiers in Materials,
Год журнала:
2024,
Номер
11
Опубликована: Ноя. 15, 2024
Limestone
Calcined
Clay
Cement
(LC3)
is
a
promising
low-carbon
alternative
to
traditional
cement,
but
its
reduced
clinker
content
limits
self-healing
ability
for
microcracks,
affecting
durability.
This
study
explores
the
application
of
Microbial
Induced
Calcite
Precipitation
(MICP)
technique
enhance
crack
capacity
LC3-based
materials.
Bacillus
pasteurii
was
utilized
induce
calcium
carbonate
precipitation
improve
LC3,
thereby
addressing
limited
durability
due
content.
Experimental
tests
focused
on
optimizing
growth
conditions
B.
,
evaluating
compressive
strength,
capillary
water
absorption,
and
rates
modified
LC3
material.
Results
showed
that
under
optimal
(pH
9,
inoculation
volume
10%,
incubation
temperature
30°C,
shaking
speed
150
rpm),
bacterial
strain
exhibited
maximum
metabolic
activity.
The
Microbe-LC3
mortar
demonstrated
rate
up
97%
cracks
narrower
than
100
μm,
significantly
higher
unmodified
LC3.
Additionally,
strength
enhanced
by
approximately
15%
compared
standard
after
28
days.
absorption
reduced,
indicating
improved
microbial-induced
filling
pores.
confirms
MICP
technology
viable
approach
performance
contributing
development
more
durable
sustainable
cementitious
materials
construction
applications.
Frontiers in Microbiology,
Год журнала:
2025,
Номер
16
Опубликована: Фев. 25, 2025
The
influence
of
different
calcium
sources
on
the
mineralization
behavior
Shewanella
putrefaciens
and
their
roles
in
microbiologically
influenced
corrosion
inhibition
(MICI)
Q235
carbon
steel
were
investigated.
Calcium
lactate,
nitrate,
L-aspartate
selected
as
alternative
to
assess
effects
bacterial
growth,
carbonate
deposition,
resistance.
S.
exhibited
stable
growth
all
tested
media,
with
pH
exceeding
8
after
14
days,
promoting
precipitation.
Under
sterile
conditions,
provided
some
inhibition,
demonstrating
most
effective
protection.
In
inoculated
systems,
lactate
facilitated
formation
a
continuous
CaCO3
mineralized
layer,
significantly
reducing
corrosion,
whereas
nitrate
resulted
discontinuous
deposits,
localized
corrosion.
Electrochemical
impedance
spectroscopy
potentiodynamic
polarization
analyses
confirmed
that
layers
formed
enhanced
resistance,
while
exacerbated
due
nitrate-reducing
activity.
These
findings
emphasize
crucial
role
source
selection
MICI
provide
insights
for
optimizing
microbial
strategies
mitigation.
Frontiers in Space Technologies,
Год журнала:
2025,
Номер
6
Опубликована: Март 27, 2025
This
study
investigates
the
potential
of
Microbially
Induced
Calcium
Carbonate
Precipitation
(MICP)
as
a
repair
technique
for
consolidated
(sintered)
bricks
made
from
Lunar
Highland
Simulant-1
(LHS-1),
aiming
to
extend
their
functional
lifespan
in
extra-terrestrial
conditions.
Sintered
(compressive
strength
∼
50
MPa)
were
fabricated
with
embedded
holes,
V-shaped
notches,
and
semi-circular
notches
simulate
structural
failure.
The
compressive
these
modified
was
assessed,
revealing
significant
reduction
due
stress
concentrations
around
cavities.
Following
this,
cavities
filled
MICP-based
soil
slurry,
resulting
notable
recovery
(
id="m2">∼
28%–54%),
although
not
levels
original
material.
Scanning
electron
microscopy
(SEM)
analysis
demonstrated
strong
interfacial
bonding
between
MICP
filler
sintered
substrate,
indicating
effectiveness
method.
Additionally,
Digital
Image
Correlation
(DIC)
used
track
crack
propagation
growth
under
loading
Instances
through
interface
highlight
areas
further
investigation.
findings
underscore
viability
sustainable
solution
repairing
construction
materials,
aligning
contemporary
practices
aimed
at
enhancing
durability
reducing
dependency
on
Earth.
Journal of Marine Science and Engineering,
Год журнала:
2025,
Номер
13(5), С. 848 - 848
Опубликована: Апрель 24, 2025
Microbially
Induced
Calcium
Carbonate
Precipitation
(MICP)
technology
has
garnered
significant
attention
in
geotechnical
engineering
and
environmental
remediation
due
to
its
environmentally
friendly
cost-effective
advantages.
However,
the
current
MICP
faces
challenges
practical
applications,
particularly
prolonged
cementation
time,
which
makes
it
difficult
meet
requirements
for
coastal
slope
reinforcement.
Therefore,
this
study
designed
novel
cultivation
conditions
Sporosarcina
pasteurii
by
regulating
external
nitrogen
source
concentration
evaluated
adaptability
measuring
OD600,
urease
activity,
bacterial
length.
By
monitoring
changes
Ca2+
concentration,
pH,
precipitation
rate
over
time
during
mineralization
process,
rapid
under
was
achieved.
The
applicability
of
approach
reinforcement
comprehensively
assessed
through
simulated
on-site
scouring
penetration
tests.
mechanism
microstructure
were
analyzed
using
scanning
electron
microscopy
(SEM),
energy
dispersive
spectrometry
(EDS),
X-ray
diffraction
(XRD).
results
indicated
that
activity
modified
NH4-YE
medium
significantly
improved
freshwater
environments,
reaction
rapid,
completing
within
4
h.
primary
crystal
form
generated
precipitate
rhombohedral
calcite,
formed
a
tightly
bonded
with
calcareous
sand,
achieving
maximum
strength
13.61
MPa.
increased
at
least
20%,
2-fold.
morphology
remained
essentially
unchanged
6
findings
provide
foundational
theoretical
data
application
sand
models.
