Evaluation of the toxicity of pervious concretes with WFS through germination tests with Eruca sativa (arugula) and Triticum aestivum (wheat) seeds
Matéria (Rio de Janeiro),
Год журнала:
2025,
Номер
30
Опубликована: Янв. 1, 2025
ABSTRACT
Concrete
is
the
most
used
construction
material,
which
results
in
harmful
impacts
on
environment
due
to
consumption
of
natural
resources.
Hence
need
use
alternative
materials,
e.g.,
waste
from
sector
and
even
other
production
sectors.
This
context
includes
development
concrete
with
sustainable
functionality,
such
as
pervious
incorporation
foundry
sand
(WFS),
a
generated
by
sector.
However,
there
scientific
gap
focusing
environmental
viability
concretes.
In
this
sense,
study
aims
evaluate
toxicity
pevious
concretes
WFS,
through
germination
tests
Eruca
sativa
(arugula)
Triticum
aestivum
(wheat)
seeds.
The
statistical
analysis
showed
that
was
no
significant
effect
WFS
rate
for
both
seeds
used.
Regarding
root
growth,
it
observed
II
(>%
Portland
cement)
had
lower
impact
arugula
(more
sensitive).
Therefore,
developed
found
be
safe
relation
phytotoxicity.
Язык: Английский
Waste Foundry Sand as an Alternative Material in Road Construction
Sustainability,
Год журнала:
2025,
Номер
17(6), С. 2370 - 2370
Опубликована: Март 7, 2025
The
generation
of
solid
waste
and
the
use
non-renewable
natural
resources
in
foundry
industry
are
environmental
challenges
that
require
search
for
solutions
guarantee
application
circular
economy
cleaner
production
principles.
Studies
on
reuse
Foundry
Sand
Waste
(FSW)
generated
this
process
can
minimization
current
impact
contribute
to
achievement
sustainability
industrial
sector.
objective
study
is
assess
feasibility
utilizing
WFS
construction
pavement
bases
sub-bases,
combination
with
sandy
soil
hydrated
lime.
laboratory
experimental
program
included
evaluation
compaction
characteristics,
California
Bearing
Ratio
(CBR),
compressive
strength,
resilient
modulus.
results
indicate
addition
25%
50%
yields
predicted
performance
levels
ranging
from
good
excellent.
inclusion
lime
enables
mixtures
be
employed
sub-bases
bases,
while
increased
content
further
enhances
load-bearing
capacity
by
up
60%
75%
WFS,
respectively.
Язык: Английский
Utilizing Iron Ore Tailings for the Development of a Sustainable Alkali-Activated Binder
Mining,
Год журнала:
2025,
Номер
5(2), С. 26 - 26
Опубликована: Апрель 2, 2025
The
increasing
production
of
iron
ore
has
led
to
the
accumulation
tailings
(IOTs),
which
pose
significant
environmental
and
safety
risks
when
stored
in
dams.
This
study
investigates
potential
IOTs
as
a
precursor
alkali-activated
binder
systems,
aiming
provide
sustainable
solution
for
mining
waste
management.
Industrial
calcium
carbide
lime
sodium
silicate
(Na2SiO3)
were
used
activators
varying
concentrations
(Na2SiO3:
10%,
15%,
20%,
25%,
30%;
lime:
5%,
7.5%,
10%),
with
curing
conditions
23
°C
7
days.
Techniques
including
unconfined
compressive
strength
tests,
X-ray
diffraction
(XRD),
Fourier
transform
infrared
spectroscopy
(FTIR),
metal
leaching
tests
employed
evaluate
mechanical
performance
binders.
results
reveal
that
mixture
containing
20%
Na2SiO3
10%
achieved
highest
0.33
MPa
at
also
showed
negligible
leaching,
meeting
standards.
These
findings
confirm
viability
using
development
durable,
eco-friendly
construction
materials,
offering
scalable
management
promoting
circular
economy
principles
sector.
Язык: Английский
Mechanical Strength, Mineralogical Characteristics and Leaching Behavior of Iron Ore Tailings Stabilized with Alkali-Activated Rice Husk Ash and Eggshell Lime Binder
Minerals,
Год журнала:
2025,
Номер
15(6), С. 567 - 567
Опубликована: Май 27, 2025
An
alternative
to
conventional
methods
for
mine
tailings
disposal
is
stabilization
with
alkali-activated
binders
(AABs),
developed
from
agro-industrial
waste.
Despite
increasing
interest
in
this
topic,
there
still
a
lack
of
studies
focusing
on
the
iron
ore
(IOTs)
using
AABs,
particularly
those
that
combine
characterization
cementitious
gels
an
evaluation
leaching
behavior.
This
study
assessed
strength,
mineralogy,
and
performance
IOTs
stabilized
AABs
formulated
rice
husk
ash
(RHA)
hydrated
eggshell
lime
(HEL),
sodium
hydroxide
as
alkaline
activator.
Tests
included
unconfined
compressive
strength
(UCS),
X-ray
diffraction
(XRD),
Fourier-transform
infrared
spectroscopy
(FTIR),
metal
analyses.
The
IOT–AAB
mixture
highest
AAB
content
dry
unit
weight
achieved
average
UCS
2.14
MPa
after
28
days
curing.
increased
content,
followed
by
curing
time,
latter
showing
non-linear
influence.
formation
C–S–H
gel
was
confirmed
days,
while
N–A–S–H
detected
early
7
cemented
mixtures
showed
no
toxicity
effectively
encapsulated
barium
originating
RHA.
Язык: Английский