Research Square (Research Square),
Journal Year:
2023,
Volume and Issue:
unknown
Published: Dec. 13, 2023
Abstract
Geological
carbon
dioxide
sequestration
as
a
key
approach
to
energy
preservation
and
emissions
reduction
has
garnered
attention
among
scholars
in
recent
years.
The
abandoned
coal
mine
contains
expansive
caving
areas
roadway
chambers,
presenting
promising
opportunity
repurpose
the
site
geological
storage
facility.
Nonetheless,
numerous
micro-cracks
are
present
surrounding
rock
of
roadway,
particularly
goaf.
Under
high-pressure
seepage
conditions
resulting
from
long-term
storage,
will
continue
fracture
expand,
forming
channels
through
which
CO
2
can
escape.
To
address
aforementioned
issues,
this
study
conducted
tests
on
superfine
cement
grout's
properties
determined
its
rheological
stability
characteristics
based
varying
particle
sizes
different
quantities
fly
ash,
silica
fume,
high-efficiency
water-reducing
additives.
sensitivity
factors
were
analyzed
an
orthogonal
test,
leading
proposing
optimal
ratio
ultrafine
ash
high
efficiency
water
reducing
agent.
This
provides
foundation
for
selecting
slurry
sealing
performance
rock.
Heliyon,
Journal Year:
2024,
Volume and Issue:
10(3), P. e25056 - e25056
Published: Jan. 22, 2024
The
use
of
Supplementary
Cementitious
Materials
(SCMs)
or
industrial
wastes
as
a
partial
replacement
for
cement
in
the
production
concrete
is
an
urgent
need
construction
industry
due
to
cement's
growing
environmental
challenges
and
rising
cost.
In
respect
this,
we
conducted
research
work
on
proportioning
binary
mixes.
Fly
ash
(FA)
replaced
10
%,
20
30
%
cement,
while
silica
fume
(SF)
5
15
cement.
A
control
mix
was
also
developed
with
100
no
SCM.
results
showed
increase
compressive
strength
FA
compared
at
early
age
3–28
days,
but
maximum
4
discovered
later
56
days
FA.
For
SF
concrete,
considerable
seen
3
days.
Like
2
improvement
recorded
concrete.
This
study
further
focused
concrete's
temporal
evolution
by
developing
model
(SEM)
using
nonlinear
regression
analysis
95
confidence
level.
Pearson
correlation
coefficient
used
determine
between
values
experimental
results.
comparison,
fib
Model
Code
2010
applied
data,
good
agreement
observed
among
proposed
model,
values,
can
be
expanded
address
regression-related
problems.
Finally,
life
cycle
assessment
revealed
that
utilizing
lowered
Global
Warming
Potential
(GWP)
9
19
29
respectively.
Likewise,
reduced
GWP
14
%.
Case Studies in Construction Materials,
Journal Year:
2024,
Volume and Issue:
20, P. e03167 - e03167
Published: April 17, 2024
A
novel
type
of
effective
microfine
cement-based
grout
(EMCG)
is
designed
for
the
complicated
water-rich
sand
stratum.
Superplasticizer
(SP),
compound
excitation
modulator
(CEM),
enhanced
stabilizer
(ES)
and
active
activator
(AA)
were
selected
as
optimizers.
Through
laboratory
tests,
main
properties
EMCG
i.e.
fluidity
performance,
viscosity,
bleeding
rate,
setting
time,
strength
volume
stability
studied.
Based
on
XRD
mineral
SEM
microstructure
hydration
mechanism
The
results
showed
that
optimal
parameters
40%
fly
ash
(MFA),
14-18%
steel
slag
(MSS),
20-25%
(MS),
2-2.5%
naphthalene-based
SP
(N),
1-1.5%
AA,
0.4-2.0%
CEM
6%
ES.
28d
compressive
can
reach
12.9-32.8
MPa.
7
d
exceed
70%
28
strength.
grouting
injectability
reinforcement
simulation
was
acquired
under
different
influence
factors
particle
size
distribution,
compactness,
type,
water-solid
ratio
(W/S),
pressure,
etc.
Quantitative
relationships
among
enhancement
or
permeability
coefficient
established.
microscopic
slurry-rock
interface
obtained.
Finally,
based
field
sealing
effects
stratum
discussed.
Due
to
high
overall
performance
excellent
engineering
applicability
EMCG,
it
an
efficient
cementitious
especially
seepage
prevention
in
geotechnical
underground
engineering.
