Buildings,
Journal Year:
2024,
Volume and Issue:
14(12), P. 4040 - 4040
Published: Dec. 19, 2024
Ultra-high-performance
concrete
is
widely
used
in
bridge
strengthening
to
improve
mechanical
performance
and
durability.
Interfacial
bonding
a
key
factor
ensuring
the
effectiveness
of
ultra-high-performance
strengthening.
The
bending
test
UHPC–NC
composite
structure
was
carried
out
this
article.
effects
groove
treatment
type
epoxy
resin
were
considered
discuss
damage
modes,
load–deflection
relationships,
strengths.
interfacial
tensile
strength
distribution
pattern
cracks
clarified.
results
showed
that
(a)
only
22.2%
groove-treated
specimens
failed
due
surface
failure,
indicating
has
high
degree
reliability;
(b)
with
an
adhesive
interface
lowest.
It
21%
higher
than
pure
normal
specimen,
effective
synergistic
force
cannot
be
achieved;
(c)
treated
positive
trapezoidal
keyway
exhibited
highest
strength,
increase
approximately
200%
compared
specimens.
right-angled
inverted
grooves
increased
by
100%
Based
on
established
three-dimensional
numerical
model
analysis
under
economic
safe
conditions,
specimen
exhibits
superior
bonding–tensile
performances.
Buildings,
Journal Year:
2025,
Volume and Issue:
15(4), P. 589 - 589
Published: Feb. 14, 2025
This
study
proposes
a
strengthening
technique
comprising
combination
of
high-strength
steel
wire
mesh
and
ultra-high
performance
concrete
(UHPC)
to
address
the
challenge
insufficient
bearing
capacity
existing
structures.
The
tensile
crack
resistance
UHPC
were
comprehensively
considered
in
this
technique.
To
evaluate
influence
fiber
volume
ratio
on
axial
performance,
uniaxial
tests
carried
out
two
sets
dumbbell-shaped
specimens.
A
constitutive
model
that
matched
experimental
results
was
established.
finite
element
analysis
RC
beams
strengthened
with
out,
based
model.
indicated
following:
(a)
ultimate
strength
specimen
reinforced
effectively
enhanced,
enhancement
ratios
97.8%
124.8%,
respectively.
(b)
embedded
interactions
between
simulated
by
considering
material
nonlinearity.
modeling
achieved.
(c)
Positive
correlations
observed
thickness
layer,
ratio,
layer
flexural
beams.
cracking
moments
maximally
enhanced
96.2%
99.4%,
Coatings,
Journal Year:
2025,
Volume and Issue:
15(4), P. 414 - 414
Published: March 31, 2025
The
interfacial
shear
performance
between
ultra-high-performance
concrete
(UHPC)
and
normal
(NC)
is
a
critical
factor
in
determining
the
overall
of
composite
structures.
This
paper
systematically
reviews
research
progress
on
UHPC-NC,
revealing
core
mechanisms
bond
strength
(dominated
by
mechanical
interlocking
with
chemical
bonding
as
supplementary
factor).
It
compares
advantages
disadvantages
single-shear,
Z-shaped
shear,
double-shear,
inclined
tests,
clarifying
influence
patterns
key
parameters
such
interface
roughness,
matrix
wetness,
curing
conditions,
fiber
content.
study
found
that
treatment
most
significant
improving
strength.
Roughening
or
grooving
treatments
can
increase
more
than
40%~80%,
while
combination
rebar
planting
further
enhance
ductility.
wetness
(saturated
moist)
UHPC
age
(within
7
days)
need
to
be
strictly
controlled
avoid
differences
shrinkage
stress.
Prediction
models
based
mechanics,
finite
element
analysis,
experimental
data
each
have
their
should
selected
actual
working
conditions.
To
address
common
issues
practical
engineering,
insufficient
cracking,
fatigue
degradation
under
cyclic
loading,
it
recommended
adopt
techniques
(such
roughening
+
planting),
prestressing
design,
optimized
distribution
(with
steel
content
1.5%~2.5%).
provides
theoretical
basis
guidance
for
design
optimization
construction
control
reinforcement
projects
