Polymers,
Год журнала:
2025,
Номер
17(7), С. 932 - 932
Опубликована: Март 29, 2025
Coal
gangue
and
flue
gas
desulfurization
gypsum
(DG)
are
industrial
by-products
whose
utilization
is
critical
for
sustainable
development.
This
study
explores
the
synergistic
activation
of
coal
using
DG
lime
to
develop
eco-friendly
cementitious
materials.
Three
systems-CF
(coal
gangue-DG),
CL
gangue-lime),
CFL
gangue-DG-lime)-were
designed
investigate
effects
on
reactivity.
Unconfined
compressive
strength
tests
identified
optimal
dosages
lime,
while
XRD,
SEM,
TGA-DTG,
NMR
analyses
were
employed
characterize
hydration
products
microstructure.
The
results
demonstrated
that
calcium
ions
from
both
facilitated
formation
C-(A)-S-H
gel,
enhancing
However,
excessive
led
undesirable
volume
expansion
due
ettringite
overproduction,
compromising
material
stability.
Excess
forms
weak
Ca(OH)2
binding
phases
causes
cracking
heat,
reducing
durability.
Thus,
dosage
in
CF
system
70%,
6%.
In
system,
70%
4%
achieve
best
performance.
combined
use
not
only
improved
reactivity
but
also
achieved
an
balance
between
enhancement
long-term
stability,
offering
a
promising
approach
construction
Journal of Building Engineering,
Год журнала:
2024,
Номер
94, С. 110039 - 110039
Опубликована: Июнь 25, 2024
The
massive
accumulation
of
coal
gangue
(Waste
from
mining)
harmed
the
environment
and
occupied
land.
Replacing
aggregate
with
(CG)
is
an
effective
way
to
solve
problem.
purpose
this
paper
expand
utilization
CG
in
construction
cold
area.
Steel
fiber
(SF)
used
as
enhancement
method
improve
performance
concrete
(CGC).
In
addition,
there
are
few
researches
on
relationship
between
frost
resistance
age
SFCGC
materials,
they
mainly
focus
material
level.
Therefore,
optimal
mixture
studied
by
orthogonal
test.
On
basis,
bearing
capacity
damage
columns
at
different
ages
during
freeze-thaw
cycle
(FTC)
were
investigated.
Indicate
that
determined
35
%
ceramsite
(CGc),
ceramic
sand
(CGs),
0.9
SF.
ranking
factors
affecting
mechanical
properties
analyzed
SF
content
>
CGc
substitution
rate
CGs
rate.
And
GM
(1,4)
strength
prediction
grey
model
established.
can
reach
125
FTCs,
freeze-resistance
diminishes
curing
shortens,
loss
compressive
boosts
increase
FTCs
(reached
61.9
FTC).
Under
identical
conditions,
column
steel
reinforcement
exhibited
more
severe
deterioration,
culminating
failure
after
100
FTCs.
laws
patterns
reinforced
under
obtained.
established
provide
support
for
application
engineering.
RSC Advances,
Год журнала:
2024,
Номер
14(53), С. 39285 - 39296
Опубликована: Янв. 1, 2024
This
review
summarizes
the
environmental
applications
of
coal
gangue
and
highlights
challenges
future
directions
its
utilization
as
a
large-scale
resource.
