Fatigue & Fracture of Engineering Materials & Structures,
Год журнала:
2024,
Номер
47(12), С. 4573 - 4587
Опубликована: Сен. 23, 2024
Abstract
To
explore
the
fracture
mode
and
failure
characteristics
of
soft
rock‐coal
combinations
under
different
disturbance
amplitudes,
this
paper
conducted
dynamic
uniaxial
compression
tests
amplitudes.
The
results
indicate
that
low‐frequency
disturbances
can
weaken
load‐bearing
capacity
specimen.
modes
specimens
vary
low
amplitude
are
not
sufficient
to
cause
overall
cracking
specimens.
In
addition,
as
increases,
fractal
dimension
composite
after
shows
a
fluctuating
trend,
reaching
its
maximum
value
at
3
MPa
minimum
4
MPa,
with
an
range
1–3.
Finally,
absolute
energy
waveform
acoustic
emission
display
damage
specimen
during
process.
This
study
provides
theoretical
basis
for
understanding
preventing
coal
rock
disasters.
Case Studies in Construction Materials,
Год журнала:
2024,
Номер
20, С. e03204 - e03204
Опубликована: Апрель 24, 2024
To
expedite
the
achievement
of
''30-60
double
carbon''
goal,
it
is
imperative
to
create
a
novel,
low-carbon,
cost-effective,
and
sustainable
backfill
material
for
mining
purposes.
Against
this
background,
paper
investigates
workability,
carbonation
performance
carbon
sequestration
capacity
coal
gangue
(CG),
magnesium
slag
(MS)
fly
ash
(FA)
as
solid
waste
material.
The
results
study
show
that:
(1)
rheological
properties
CFM
fresh
slurry
conform
Herschel-Balkley
(H-B)
model,
its
flowability
meets
requirements
mine
transport.
With
increasing
MS
content,
yield
stress,
apparent
viscosity,
thixotropy
shear
thickening
increase,
micro-slump
diffusion
diameter
decrease.
(2)
Carbonation
curing
can
effectively
improve
early
UCS
CFM.
highest
was
8.854
MPa
after
7
days
curing,
which
27.84
times
higher
than
that
standard
curing.
In
addition,
increased
with
increase
age
content.
(3)
produces
large
number
products
such
calcium
carbonate
makes
microstructure
denser.
(4)
absorb
up
14.55%
CO2
carbonation.
(5)
volume
stability
significantly
improved
summary,
not
only
new
type
low-cost,
low-carbon
material,
but
practical
application
in
field
backfilling
also
has
great
potential
realisation
resource
utilisation
sequestration.
Case Studies in Construction Materials,
Год журнала:
2024,
Номер
21, С. e03450 - e03450
Опубликована: Июль 1, 2024
Alkaline
rice
straw
fibers
(ARSF),
as
a
widely
available
and
recyclable
plant
fiber
source,
can
provide
new
insights
for
improving
the
mechanical
properties
of
backfill
treatment
agricultural
waste
resources
research.
Different
amounts
ARSF
were
prepared
to
enhance
cemented
lithium
mica
tailings
(CLMTB),
uniaxial
compression
strength
(UCS)
tests
Brazilian
splitting
tensile
conducted
study
influence
on
static
CLMTB
samples.
Firstly,
flowability
mortars
with
different
content
was
tested,
results
showed
that
decreased
by
maximum
5.4
%,
which
met
construction
requirements
cement
mortar
in
process.
The
UCS
an
increasing
trend
then
reduced
increased
content,
0.15
%
being
optimal
showing
increase
14.2
%.
Under
loading
conditions,
gradually
0.60
content.
samples
exponential
growth
curing
age.
Additionally,
there
linear
functional
relationship
between
age
experimental
indicate
improved
toughness
changed
failure
mode
In
meantime,
it
residual
bearing
capacity
peak
strain
