Materials,
Год журнала:
2024,
Номер
17(18), С. 4609 - 4609
Опубликована: Сен. 20, 2024
This
study
explores
the
utilization
of
municipal
solid
waste
incineration
fly
ash
(MSWIFA)
in
geopolymer
concrete,
focusing
on
compressive
strength
and
heavy
metal
leachability.
MSWIFA
was
sourced
from
a
Shenzhen
plant
pretreated
by
washing
to
remove
soluble
salts.
Geopolymer
concrete
prepared
incorporate
with
washed
or
unwashed
tested
under
different
pH
conditions
(2.88,
4.20,
10.0).
Optimal
achieved
Si/Al
ratio
1.5,
water/Na
10,
sand-binder
0.6.
The
pretreatment
significantly
enhanced
strength,
particularly
alkaline
conditions,
GP-WFA
(washed
MSWIFA)
exhibiting
49.6%
increase
compared
21.3%
GP-FA
(unwashed
MSWIFA).
Additionally,
GP-WFA’s
reached
41.7
MPa,
comparable
that
control
(GP-control)
at
43.7
MPa.
Leaching
tests
showed
acidic
(pH
2.88)
promoted
leaching,
which
increased
over
leaching
time,
while
an
environment
reduced
leachability
metals.
These
findings
highlight
potential
using
promoting
sustainable
construction
practices,
conditions.
Case Studies in Construction Materials,
Год журнала:
2024,
Номер
20, С. e03020 - e03020
Опубликована: Фев. 29, 2024
Hydraulic
structures
may
be
subjected
to
erosion
and
damage
by
high-speed
sand
carrying
water
flow
in
the
overflow
area,
seriously
weakening
normal
operation
of
building.
Due
limited
research
on
wear
resistance
ordinary
concrete
as
a
drainage
structure,
this
paper
took
actual
engineering
examples
study
effects
compressive
strength,
aggregate
ppaper
size,
volume
fraction,
pore
size
parameters,
velocity,
bed
load
suspended
content.
The
results
showed
that
when
using
underwater
steel
ball
method
for
testing,
no
strong
correspondence
between
abrasion
strength.
strength
grade
was
C40
-
C55,
with
similar
resistance.
When
close,
1.42–1.68
times
mortar.
smaller
difference
fraction
compact
porosity
coarse
aggregate,
higher
proportion
50–100
nm
structure
negatively
correlated
concrete,
while
fractal
dimension
positively
speed
decreased
from
1.5
m/s
1.25
m/s,
has
increased
97%.
influence
minimal
compared
load.
Comprehensively
studies
different
factors
providing
theoretical
guidance
practical
experience
improving
concrete.
Case Studies in Construction Materials,
Год журнала:
2024,
Номер
20, С. e02996 - e02996
Опубликована: Фев. 20, 2024
For
the
purpose
of
enhancing
utilization
rate
limestone
powder
(LP)
in
concrete
and
maximizing
its
activity
effect.
In
this
paper,
replacement
methods
for
replacing
fly
ash
(FA)
with
fine
particles
manufactured
sand
(MS)
coarse
were
proposed.
The
content
LP
FA
increased
from
10%
to
50%,
MS
5%
20%.
effects
alone,
alone
particle-screened
both
on
workability,
mechanical
properties,
durability
compared.
Analysis
variance
(Anova)
was
used
determine
importance
level
test
parameters
performance
characteristics
concrete.
results
suggested
that
improved
workability
strength
concrete,
ameliorated
carbonation
chloride
ion
permeability
resistance.
However,
amount
substitution
very
low,
only
10%.
Compared
screened
cohesion
water
retention
improvement
at
7
28
days
better,
which
1.6
MPa
1.3
higher
than
alone.
And
there
no
significantly
adverse
effect
Moreover,
it
conducive
LP.
According
research
results,
interaction
between
mixing
method
cannot
be
ignored.
addition,
more
environmentally
friendly
economical,
because
recycling
solid
waste
landfill
treatment.
The
cement
industry
has
achieved
the
harmless
and
resourceful
disposal
of
incineration
fly
ash,
but
environmental
safety
heavy
metals
during
its
service
life
is
still
unknown.
Therefore,
evolution
metal
leaching
wet–dry
cycle
ash
after
different
solidification
treatments
been
studied.
We
provide
a
theoretical
basis
for
long-term
safe
use
resource
utilization.
results
showed
that
when
underwent
90
dry–wet
cycles,
Cd
exceeded
19.40%
Chinese
standard
GB
18598-2019.
Upon
addition
10%
30%
to
trend
increasing
slowed,
with
higher
content
enhancing
capability
metals.
When
mixed
180
40.75%
18598-2019,
while
samples
did
not
exceed
limit,
at
84.45%
As
an
admixture,
compressive
strength
increased
number
cycles.
dosage
was
20%,
maximum
cycles
only
5.19%
toxicity
index
also
decreasing
compared
ash.
admixture
ensured
life.
