International Journal of Mining Reclamation and Environment,
Journal Year:
2024,
Volume and Issue:
unknown, P. 1 - 19
Published: Oct. 21, 2024
To
increase
the
bearing
capacity
of
cemented
tailings
backfill
(CTB)
and
to
reduce
crack
development
damage
in
due
internal
defects
or
external
disturbances.
This
paper
investigates
effect
mixing
alkalized
rice
straw
(ARS)
on
mechanical
properties
layered
(LCTB)
by
load-bending
strength
experiment,
surface
strain
field
testing,
microstructural
analysis.
The
results
study
showed
that:
ability
straw-reinforced-LCTB
(AR-LCTB)
resist
bending
is
superior
when
content
length
ARS
are
range
1
wt%
1.5
9
mm
−
12
mm.
It
also
stores
more
energy
converted
from
loads,
releasing
incredible
fracture
case
damage.
Most
extension
AR-LCTB
will
develop
horizontally
along
interface,
resulting
a
stepped
morphology
penetration
joints.
Ettringite
(AFt)
hydrate
calcium
silicate
(C-S-H)
gel
were
found
be
leading
hydration
materials
matrix.
ARS's
bridging
allowed
maintain
certain
level
integrity
after
being
loaded
beyond
its
peak
strength.
ARS-interface-
matrix
forms
complete
composite
structure
owing
combination
products
attached
ARS,
which
improves
specimens
Adding
can
effectively
enhance
flexural
LCTB.
guides
safe
design
mines
while
providing
new
ideas
for
environmentally
sound
treatment
agricultural
waste.
Scientific Reports,
Journal Year:
2025,
Volume and Issue:
15(1)
Published: March 1, 2025
Red
mud
(RM),
a
solid
waste
byproduct
of
the
alumina
industry,
has
accumulated
in
significant
global
stockpiles.
Currently,
primary
application
RM
involves
magnetic
separation
to
recover
iron
oxides,
while
residual
is
predominantly
landfilled.
Due
its
strong
alkalinity,
can
serve
as
substitute
for
alkalis
or
sodium
salts
alkali
activation
concrete,
thereby
accelerating
setting
time
and
improving
early-age
strength.
Building
on
this
property,
study
designs
develops
an
based
rapid
filling
support
material,
primarily
composed
RM,
which
features
high
early
This
material
intended
high-water-content
materials
gob-side
entry
retaining
coal
mining.
Experimental
results
demonstrate
that
when
content
reaches
70%
cement
10%,
Rapid-Setting
Filling
Support
Material
(RSM)
achieves
satisfactory
compressive
strength
initial
time,
coupled
with
excellent
economic
performance.
The
strengths
at
1
day,
3
days,
7
28
days
are
6.12
MPa,
8.97
11.25
12.33
respectively,
meeting
all
requirements
specified
'Technical
Requirements
Roadside
Bag
Gob-side
Entry
Retaining
High-Water
Material'
(GB/T
39336-2020).
RSM
also
exhibits
good
durability,
hydration
products
including
C–S–H
gel,
ettringite,
calcium
carbonate,
contribute
development.
Leaching
tests
reveal
heavy
metal
ion
concentrations
leachate
comply
integrated
emission
standards
Class
III
groundwater
wastewater,
confirming
safe
application.
Considering
annual
increase
approximately
13,000
km
roadway
length
mining
China,
demand
substantial.
Consequently,
findings
hold
environmental
value,
potential
promote
green
practices
circular
economy.
Molecules,
Journal Year:
2025,
Volume and Issue:
30(7), P. 1520 - 1520
Published: March 29, 2025
Cemented
paste
backfill
with
mine
tailings
provides
a
desirable
solution
for
maximally
utilizing
tailings.
Ordinary
Portland
cement
(OPC)
is
the
most
widely
used
binder
cemented
backfills;
however,
serious
environmental
problems
resulting
from
OPC
production
and
drawbacks
of
in
cementing
fine
motivate
investigation
novel
binders
characterized
by
friendliness,
cost-effectiveness,
efficiency.
We
previously
synthesized
solid-waste-based
cementitious
materials
(SWCMs)
In
this
study,
CaCl2
was
added
as
an
accelerator
to
further
enhance
performance
SWCMs
Adding
small
amount
accelerated
hydration
raw
prompted
formation
larger
amounts
products.
As
result,
significantly
enhanced
through
combined
effect
C-S-H
gel
ettringite.
The
can
be
hardened
only
after
curing
~36
h,
50%
decrease
hardening
duration
compared
control
sample
without
CaCl2.
optimal
controlled
at
1.5
wt.%,
strength
reached
0.21
MPa
36
even
low
binder-to-tailings
ratio
1:8,
meeting
requirement
early
common
backfills.
rapid
backfills
has
significant
implications
accelerating
ore
mining
speed,
improving
capacity,
ensuring
safe
environment
underground
sites,
preventing
movement
surface
masses
terrain
where
takes
place.
