Study on mechanical properties and freeze-thaw damage law of steel fiber coal gangue concrete
Journal of Building Engineering,
Journal Year:
2024,
Volume and Issue:
94, P. 110039 - 110039
Published: June 25, 2024
The
massive
accumulation
of
coal
gangue
(Waste
from
mining)
harmed
the
environment
and
occupied
land.
Replacing
aggregate
with
(CG)
is
an
effective
way
to
solve
problem.
purpose
this
paper
expand
utilization
CG
in
construction
cold
area.
Steel
fiber
(SF)
used
as
enhancement
method
improve
performance
concrete
(CGC).
In
addition,
there
are
few
researches
on
relationship
between
frost
resistance
age
SFCGC
materials,
they
mainly
focus
material
level.
Therefore,
optimal
mixture
studied
by
orthogonal
test.
On
basis,
bearing
capacity
damage
columns
at
different
ages
during
freeze-thaw
cycle
(FTC)
were
investigated.
Indicate
that
determined
35
%
ceramsite
(CGc),
ceramic
sand
(CGs),
0.9
SF.
ranking
factors
affecting
mechanical
properties
analyzed
SF
content
>
CGc
substitution
rate
CGs
rate.
And
GM
(1,4)
strength
prediction
grey
model
established.
can
reach
125
FTCs,
freeze-resistance
diminishes
curing
shortens,
loss
compressive
boosts
increase
FTCs
(reached
61.9
FTC).
Under
identical
conditions,
column
steel
reinforcement
exhibited
more
severe
deterioration,
culminating
failure
after
100
FTCs.
laws
patterns
reinforced
under
obtained.
established
provide
support
for
application
engineering.
Language: Английский
Comparison of fracture behavior of set concretes based on natural and crushed aggregates
Materials Research Express,
Journal Year:
2024,
Volume and Issue:
11(10), P. 105509 - 105509
Published: Oct. 1, 2024
Abstract
The
studies
were
carried
out
to
diagnose
the
effects
of
coarse
aggregate
type
on
mechanical
behavior
plain
concretes
under
incremental
loading.
During
parameters
including
compressive
strength
(
f
cm
)
and
splitting
tensile
ctm
),
as
well
fracture
involving
critical
stress
intensity
factor
K
Ic
mathvariant="normal">S
crack
tip
opening
displacement
CTOD
c
evaluated.
aim
study
was
accurately
assess
impact
mineral
aggregates
toughness
ordinary
concretes.
In
order
obtain
most
reliable
comparison
obtained
test
results,
aggregates,
both
natural
crushed,
from
same
geographic
area
(most
commonly
used
in
concretes)
experiments.
Hence,
crushed
covered:
basalt
(BA),
granite
(GT)
limestone
(LM)
pebble
gravel
(GL)
concrete
mixtures.
For
better
understanding
initiation
propagation
with
different
a
macroscopic
failure
surfaces
examination
tested
beams
is
also
presented.
Both
analyzed
mechanics
parameters,
i.e.
mathvariant="italic">K
increased
significantly
case
which
manufactured
based
aggregates.
They
amounted
at
levels
ranging
20%
for
aggregate,
over
30%
much
70%
aggregate.
process
each
series
was:
quasi-plastic
concrete,
semi-brittle
clearly
brittle
results
help
explain
how
affects
bending.
Language: Английский
Effect of Coarse Aggregate Type on the Fracture Toughness of Ordinary Concrete
Infrastructures,
Journal Year:
2024,
Volume and Issue:
9(10), P. 185 - 185
Published: Oct. 13, 2024
This
research
work
aims
to
compare
the
strength
and
fracture
mechanics
properties
of
plain
concretes,
obtained
from
different
coarse
aggregates.
During
study,
mechanical
parameters
including
compressive
(fcm)
splitting
tensile
(fctm),
as
well
involving
critical
stress
intensity
factor
(KIcS)
crack
tip
opening
displacement
(CTODc)
were
evaluated.
The
effect
aggregates
used
on
brittleness
concretes
was
also
analyzed.
For
better
understanding
initiation
propagation
in
with
aggregates,
a
macroscopic
failure
surfaces
examination
tested
beams
is
presented.
Crushed
covered
basalt
(BA),
granite
(GT),
limestone
(LM),
natural
peeble
gravel
aggregate
(GL)
concrete
mixtures.
Fracture
toughness
tests
performed
an
MTS
810
testing
machine.
Due
high
rock
material,
rough
surface
grains,
good
bonding
ITZ
area
between
paste,
crushed
exhibited
toughness.
Both
analyzed
parameters,
i.e.,
KIcS
CTODc,
increased
significantly
case
which
manufactured
They
amounted,
comparison
based
aggregate,
levels
ranging
20%
for
over
30%
much
70%
aggregate.
On
other
hand,
showed
lowest
because
smooth
grains
poor
cement
paste.
However,
process
each
series
quasi-plastic
concrete,
semi-brittle
clearly
brittle
results
help
explain
how
type
affects
at
bending.
Language: Английский
Towards 3D Pore Structure of Porous Gypsum Cement Pozzolan Ternary Binder by Micro-Computed Tomography
Journal of Composites Science,
Journal Year:
2024,
Volume and Issue:
8(7), P. 264 - 264
Published: July 8, 2024
A
sophisticated
characterisation
of
a
porous
material
structure
has
been
challenging
in
science.
Three-dimensional
(3D)
analysis
allows
the
evaluation
material’s
homogeneity,
pore
size
distribution
and
wall
properties.
Micro-computed
tomography
(micro-CT)
offers
non-destructive
test
method
for
evaluation.
This
paper
characterises
novel
ternary
binder’s
using
micro-CT.
Gypsum–cement–pozzolan
(GCP)
binders
are
low-carbon
footprint
binders.
Both
natural
industrial
gypsum
were
evaluated
as
major
components
GCP
Porous
binder
was
obtained
by
foaming
admixture,
bulk
density
characterised
ranged
from
387
to
700
kg/m3.
Micro-CT
results
indicate
that
pores
range
0.017
3.0
mm
can
be
effectively
detected
described
The
proved
dominant
0.1
0.2
micropores.
For
produced
with
gypsum,
macropores
2.2
2.9
formed,
while
phosphogypsum
possess
0.6
mm.
an
effective
instrument
characterising
homogeneity
hierarchical
Language: Английский