Effect of calcium chloride-assisted calcined coal gangue as a supplementary cementitious material (SCM) on cement strength and microstructure
Construction and Building Materials,
Год журнала:
2025,
Номер
467, С. 140409 - 140409
Опубликована: Фев. 15, 2025
Язык: Английский
Towards coal mining waste valorization: Gangue as resource for the production of geopolymer and related alkali-activated materials
Green Technologies and Sustainability,
Год журнала:
2025,
Номер
unknown, С. 100205 - 100205
Опубликована: Апрель 1, 2025
Язык: Английский
Experimental Study on the Mechanical Properties and Microstructural Mechanisms of Coal Gangue-Based Cementitious Materials Synergistically Activated by Desulfurization Gypsum and Lime
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
Язык: Английский
Dual-activated calcined coal gangue for high-performance and eco-friendly cementitious materials
Journal of Materials Research and Technology,
Год журнала:
2025,
Номер
unknown
Опубликована: Май 1, 2025
Язык: Английский
Evaluating next-gen sustainable cementitious materials: Unleashing the potential of LC3-based composites under high-temperature environments
Journal of Cleaner Production,
Год журнала:
2025,
Номер
unknown, С. 145421 - 145421
Опубликована: Апрель 1, 2025
Язык: Английский
In situ/operando spectroscopic studies of Cu-doped CeO2 on SiO2 derived from coal gangue for preferential CO oxidation
Journal of environmental chemical engineering,
Год журнала:
2025,
Номер
unknown, С. 116822 - 116822
Опубликована: Апрель 1, 2025
Язык: Английский
Effects of Calcined Coal Gangue and Carbide Slag on the Properties of Cement Paste and Mortar
Materials,
Год журнала:
2025,
Номер
18(10), С. 2242 - 2242
Опубликована: Май 12, 2025
When
using
supplementary
cementitious
materials
to
replace
cement
partially,
the
carbon
emissions
of
products
can
be
reduced,
but
it
often
leads
reduced
strength.
This
study
explores
application
potential
carbide
slag
(CS)
and
calcined
coal
gangue
(CCG),
byproducts
acetylene
production,
partially
cement.
The
effects
these
two
on
macroscopic
properties
microstructure
cement-based
were
analyzed
through
systematic
experiments.
compressive
strength,
ultrasonic
pulse
velocity,
electrical
resistivity
test
results
showed
that
replacing
20%
with
CCG
did
not
cause
significant
changes
in
specimens.
An
X-ray
diffraction
(XRD)
analysis
produce
additional
hydration
products.
Scanning
electron
microscopy
images
(SEM)
further
revealed
produces
fill
microscopic
pores.
Thermogravimetric
(TG)
after
28
days
addition
materials,
calcium
hydroxide
(CH)
CS
reacts
CCG,
resulting
consumption
CS.
Finally,
environmental
impact
was
assessed.
It
found
is
more
favorable
for
reducing
compared
CCG.
However,
when
considering
effect
replacement
combining
advantageous
sustainable
development.
Overall,
use
demonstrated
good
performance
promoting
Язык: Английский