Journal of Progress in Civil Engineering,
Год журнала:
2024,
Номер
6(10), С. 49 - 54
Опубликована: Окт. 29, 2024
Engineered
Cementitious
Composite
(ECC)
is
a
type
of
highly
ductile
cementitious
material.
However,
due
to
its
characteristics
high
energy
consumption
and
carbon
emissions,
it
necessary
seek
new
low-carbon
environmentally
friendly
substitute.
Geopolymer
(EGC),
as
promising
construction
material
for
replacing
ECC,
has
broad
application
prospects.
Through
visual
analysis
the
relevant
literature
in
Web
Science,
was
discovered
that
research
on
EGC
mainly
concentrates
aspects
such
types
precursors,
chemical
composition
alkali-activated
solution,
related
parameters
fibers.
This
paper
combines
experimental
data
tensile
properties
conducted
by
scholars
at
home
abroad,
focuses
analyzing
influence
precursor
types,
alkaline
activator,
fibers
EGC.
The
statistical
results
indicate
fly
ash
ground
granulated
blast-furnace
slag
(GGBFS)
are
most
commonly
used
materials.
Replacing
an
appropriate
amount
with
GGBFS
can
significantly
enhance
strength
activator
molarity
have
relatively
obvious
An
increase
NaOH
within
certain
range
Furthermore,
incorporation
fibers,
especially
synthetic
polypropylene
(PP)
polyvinyl
alcohol
(PVA)
well
inorganic
glass
(GF)
(CF),
effectively
strain
capacity
use
hybrid
may
further
improve
properties.
Polymers,
Год журнала:
2025,
Номер
17(8), С. 1072 - 1072
Опубликована: Апрель 16, 2025
Steel
fibers
(STs),
polyvinyl
alcohol
(PVAs),
and
polyethylene
(PEs)
were
selected
to
systematically
investigate
the
effects
of
different
fiber
types
dosages
on
workability
(slump
spread)
mechanical
properties
(compressive
strength
splitting
tensile
strength)
slag–Yellow
River
sand
geopolymer
eco-cementitious
materials.
By
combining
microstructural
testing
techniques
such
as
thermogravimetric-differential
thermal
analysis
(TG-DTA),
X-ray
diffraction
(XRD),
scanning
electron
microscopy-energy
dispersive
spectroscopy
(SEM-EDS),
influence
mechanisms
characteristic
products
microstructure
matrix
thoroughly
revealed,
role
in
development
Yellow
sediment-based
geopolymers
was
elucidated.
The
results
show
that
content
increases,
mixture
significantly
decreases.
appropriate
incorporation
steel
PVAs
can
enhance
toughness
matrix.
When
dosage
is
1%,
28-day
compressive
specimens
with
increased
by
25.93%
21.96%,
respectively,
compared
control
group,
while
50.00%
60.34%,
respectively.
However,
action
differ
significantly;
primarily
performance
through
their
high
stiffness
strength,
whereas
inhibit
crack
propagation
flexibility
excellent
bonding
properties.
In
contrast,
improvement
PEs
mainly
reflected
toughening.
1.5%,
PE
72.61%,
tensile-to-compressive
ratio
92.32%
group.
Microstructural
indicates
does
not
alter
alkali-activated
cementitious
materials,
but
excessive
affects
generation
gel-like
distribution
free
water,
thereby
altering
decomposition
behavior
gel
products.
Additionally,
incorporating
forms
a
honeycomb-like
amorphous
gel,
resulting
weak
interfacial
between
This
one
main
reasons
for
limited
reinforcing
effect
at
microscopic
scale
key
factor
inferior
long-term
PVAs.
study
provides
theoretical
foundations
practical
guidance
optimizing
fiber-reinforced
Materials,
Год журнала:
2025,
Номер
18(8), С. 1845 - 1845
Опубликована: Апрель 17, 2025
The
incorporation
of
mineral
admixtures
plays
a
crucial
role
in
enhancing
the
performance
and
sustainability
geopolymer
systems.
This
study
evaluates
influence
fly
ash
(FA),
silica
fume
(SF),
metakaolin
(MK)
as
typical
on
slag–Yellow
River
sediment
eco-cementitious
materials.
impact
varying
replacement
ratios
these
for
slag
setting
time,
workability,
reaction
kinetics,
strength
development
were
thoroughly
investigated.
To
understand
underlying
mechanisms,
microstructural
analysis
was
conducted
using
thermogravimetric–differential
thermal
(TG-DTA),
X-ray
diffraction
(XRD),
scanning
electron
microscopy–energy
dispersive
spectroscopy
(SEM-EDS),
mercury
intrusion
porosimetry
(MIP).
results
indicate
that
FA,
SF,
delayed
initial
reaction,
prolonged
induction
period,
reduced
acceleration
rate.
These
effects
hindered
early
development.
At
30%
FA
content,
matrix
exhibited
excellent
flowability
sustained
heat
release.
28-day
splitting
tensile
increased
by
42.40%,
while
compressive
decreased
2.85%.
In
contrast,
20%
SF
significantly
improved
strength,
increasing
strengths
11.19%
6.16%,
respectively.
15%
metakaolin,
improvement
intermediate,
with
3.55%
10.59%,
However,
dosages
exceeding
workability.
did
not
interfere
slag’s
alkali-activation
reaction.
newly
formed
N-A-S-H
C-S-H
gels
integrated
original
C-A-S-H
gels,
optimizing
pore
structure
reducing
pores
larger
than
1
µm,
compactness
reinforcement.
provides
practical
guidance
use
sustainable
