Case Studies in Construction Materials,
Год журнала:
2024,
Номер
20, С. e03035 - e03035
Опубликована: Март 5, 2024
Aquatic
environments
can
be
severely
harsh,
so
structures
need
suitable
materials
to
endure
them.
Among
the
promising
for
aquatic
are
cementitious
composites;
however,
their
ability
withstand
degrading
should
evaluated.
This
study
aims
evaluate
composite's
mechanical
and
fracture
behavior
with
seven
mix
designs
in
three
submerged
fresh
saltwater
exposed
a
simulated
offshore
tidal-splash
regime.
Environmental
exposure
durations
were
chosen
as
28,
90,
365
days.
Cementitious
composites
developed
glass,
PVA,
PP
fibers.
The
results
show
different
behaviors,
from
fully
brittle
(without
fiber)
strain-hardening
(made
of
PVA
fibers).
In
splash
zone
environment,
up
25%
strength
degradation
is
seen
most
severe
conditions.
parameters,
indexes
reduced
more
severely.
failure
patterns
investigated,
some
SEM
photos
presented,
statistical
evaluations
(including
trends
correlations)
presented.
Journal of Materials Research and Technology,
Год журнала:
2023,
Номер
24, С. 8997 - 9014
Опубликована: Май 1, 2023
Rubberized
steel
fiber
reinforced
recycled
aggregate
concrete
(RSRAC)
is
an
environmental-friendly
building
material
produced
from
waste
and
tires.
However,
the
evolution
of
fracture
behavior
in
RSRAC
under
flexural
loads
still
remains
unknown,
individual
as
well
coupling
effects
(RA),
crumb
rubber,
are
also
unclear.
In
this
paper,
four
groups
specimens
with
different
contents
RA,
were
prepared,
a
series
four-point
bending
tests
conducted.
The
loading
process
was
monitored
by
acoustic
emission
(AE)
real-time,
then
analyzed
through
AE
signals
using
multiple
statistical
methods
including
Ib-value
method,
cumulative
energy
analysis,
intensity
K-means
clustering
RA-AF
analysis.
Scanning
electron
microscope
(SEM)
employed
to
give
explanations
microscale.
Results
show
that
can
be
divided
into
micro-crack
stage,
main
collapse
residual
stage.
A
fluctuation
greater
than
0.06
could
regarded
criterion
for
division.
counts,
cluster
analysis
effective
judging
sub-stages.
dominant
failure
mode
stage
tensile
crack,
shear
cracks
mainly
occur
SEM
investigation
has
revealed
come
acicular
crystals
or
micro-chimeras
at
interface.
For
materials,
it
found
rubber
reduce
brittleness
improve
ductility
concrete,
but
will
lower
strength
properties.
Steel
increase
ductility,
favorable
strength.
While
RA
harmful
both
coexistence
significantly
shorten
work
expected
provide
deeper
understanding
on
properties
RSRAC.
