Antimicrobial Activity of Eco-Friendly Fly-Ash-Based Geopolymer Mortar
Materials,
Journal Year:
2025,
Volume and Issue:
18(8), P. 1735 - 1735
Published: April 10, 2025
As
cement
production
causes
large
amounts
of
CO2
emissions
and
is
not
sustainable,
there
a
growing
worldwide
interest
in
developing
cleaner
construction
materials
by
reducing
carbon
reusing
existing
industrial
waste.
Also,
antimicrobially
active
are
gaining
attention
due
to
enhancing
structural
longevity.
By
preventing
microbial
growth,
these
help
improve
indoor
air
quality
occupant
health.
Geopolymer
mortars/concretes
(GPM/GPC)
with
high
mechanical,
physical
durability
properties
considered
as
an
eco-friendly
alternative
ordinary
Portland
(OPC)
mortars/concretes.
In
this
study,
the
composition,
microstructural,
mechanical
antimicrobial
geopolymers
produced
at
different
curing
temperatures
(60,
80,
100
120
°C)
were
investigated.
Low-lime
fly
ash
was
used
binder
sodium
silicate
hydroxide
alkaline
solution
geopolymer
production.
Although
X-ray
fluorescence
(XRF)
results
showed
increase
geopolymerization
products
increasing
temperature,
SEM
analysis
that
crack
formation
occurs
microstructure
cured
above
°C
leads
decreased
properties.
The
strength
performance
test
for
mortars
optimum
temperature
°C,
highest
compressive
(48.41
MPa)
reached
temperature.
A
decrease
observed
cracks
occurring
higher
temperatures.
agar
diffusion
method
determine
activity
GPMs
against
four
bacteria
one
fungus
species.
samples
subjected
thermal
formed
inhibition
zones
(38.94-49.24
mm).
Furthermore,
alkalinity
components/mixtures
has
direct
relationship
activity.
result,
superior
can
be
promising
building
materials,
especially
applications
where
hygiene
priority
structures
likely
exposed
corrosion.
Language: Английский
Carbon-Negative Nano-TiO2-Modified Photocatalytic Cementitious Composites: Removal of Airborne Pollutants (NOx and O3) and Its Impact on CO2 Footprint
Coatings,
Journal Year:
2024,
Volume and Issue:
14(12), P. 1607 - 1607
Published: Dec. 23, 2024
This
study
explores
the
development
and
performance
of
photocatalytic
cementitious
composites
modified
with
nano-TiO2
to
address
urban
air
quality
sustainability
challenges.
Nine
mortar
series
were
prepared,
incorporating
binders
varying
carbon
footprints
mass
contents
across
different
series.
The
interplay
between
fundamental
(abrasion
resistance)
functional
(air
purification
efficiency)
properties
composites’
surfaces
interfaces
was
investigated.
removal
airborne
pollutants,
specifically
nitrogen
oxides
(NOx)
ozone
(O3),
evaluated
under
simulated
environmental
conditions.
variations
in
binder
composition
influenced
overall
initial
footprint
efficiency.
assessment
revealed
a
possible
net
decrease
emissions
over
life
cycle
composite
due
(greenhouse
gas)
its
precursor—NOx,
highlighting
potential
for
dual
benefits
an
environment,
emphasizing
critical
role
surface
interface
engineering
achieving
carbon-negative
composites.
Language: Английский
Application of a Generalized Utility Function to Determine the Optimal Composition of Geopolymer Mortar
Materials,
Journal Year:
2024,
Volume and Issue:
17(24), P. 6237 - 6237
Published: Dec. 20, 2024
The
aim
of
the
presented
research
was
to
evaluate
impacts
modifications
technical
properties
fly
ash-based
geopolymer
composites,
particularly
focusing
on
enhancing
thermal
insulation.
Through
utilization
a
generalized
utility
function,
optimal
dosages
additives
such
as
perlite
sand,
waste
powder,
and
cenospheres
were
determined.
study
aimed
increase
insulation
composites
while
maintaining
satisfactory
compressive
flexural
strength.
results
indicated
that
dust
significantly
influenced
characteristics
composites;
an
exception
strength,
for
which
these
did
not
show
statistically
significant
effect.
average
strength
values,
except
mixes
with
poor
workability,
at
least
3.5
MPa
(RILEM
class
II).
Notably,
balanced
dosage
additives,
around
75
kg
per
cubic
meter
mixture
in
total
mixture,
yielded
most
favorable
outcomes
terms
isolation
(0.18–0.24
W/(m·K)
workability
(cone
immersion
40–70
mm).
Additionally,
emerged
potentially
superior
modifier
due
its
origin.
However,
further
analysis
considering
life
cycle
parameters
including
carbon
footprint
water
would
be
necessary
validate
this
claim.
Overall,
highlights
potential
utilizing
perlite-based
modifiers
enhance
geopolymers
addressing
environmental
concerns.
Language: Английский