Scientific Reports,
Journal Year:
2025,
Volume and Issue:
15(1)
Published: Feb. 10, 2025
The
increasing
demand
for
sustainable
construction
materials
has
led
to
the
incorporation
of
Palm
Oil
Fuel
Ash
(POFA)
into
concrete
reduce
cement
consumption
and
lower
CO₂
emissions.
However,
predicting
compressive
strength
(CS)
POFA-based
remains
challenging
due
variability
input
factors.
This
study
addresses
this
issue
by
applying
advanced
machine
learning
models
forecast
CS
POFA-incorporated
concrete.
A
dataset
407
samples
was
collected,
including
six
parameters:
content,
POFA
dosage,
water-to-binder
ratio,
aggregate
superplasticizer
curing
age.
divided
70%
training
30%
testing.
evaluated
include
Hybrid
XGB-LGBM,
ANN,
Bagging,
LSSVM,
GEP,
XGB
LGBM.
performance
these
assessed
using
key
metrics,
coefficient
determination
(R2),
root
mean
square
error
(RMSE),
normalized
means
(NRMSE),
absolute
(MAE)
Willmott
index
(d).
XGB-LGBM
model
achieved
maximum
R2
0.976
lowest
RMSE,
demonstrating
superior
accuracy,
followed
ANN
with
an
0.968.
SHAP
analysis
further
validated
identifying
most
impactful
factors,
ratio
emerging
as
influential.
These
predictive
offer
industry
a
reliable
framework
evaluating
concrete,
reducing
need
extensive
experimental
testing,
promoting
development
more
eco-friendly,
cost-effective
building
materials.
Scientific Reports,
Journal Year:
2024,
Volume and Issue:
14(1)
Published: April 10, 2024
Abstract
Preplaced
aggregate
concrete
(PAC)
also
known
as
two-stage
(TSC)
is
widely
used
in
construction
engineering
for
various
applications.
To
produce
PAC,
a
mixture
of
Portland
cement,
sand,
and
admixtures
injected
into
mold
subsequent
to
the
deposition
coarse
aggregate.
This
process
complicates
prediction
compressive
strength
(CS),
demanding
thorough
investigation.
Consequently,
emphasis
this
study
on
enhancing
comprehension
PAC
using
machine
learning
models.
Thirteen
models
are
evaluated
with
261
data
points
eleven
input
variables.
The
result
depicts
that
xgboost
demonstrates
exceptional
accuracy
correlation
coefficient
0.9791
normalized
determination
(R
2
)
0.9583.
Moreover,
Gradient
boosting
(GB)
Cat
boost
(CB)
perform
well
due
its
robust
performance.
In
addition,
Adaboost,
Voting
regressor,
Random
forest
yield
precise
predictions
low
mean
absolute
error
(MAE)
root
square
(RMSE)
values.
sensitivity
analysis
(SA)
reveals
significant
impact
key
parameters
overall
model
sensitivity.
Notably,
gravel
takes
lead
substantial
44.7%
contribution,
followed
by
sand
at
19.5%,
cement
15.6%,
Fly
ash
GGBS
5.9%
5.1%,
respectively.
best
fit
i.e.,
XG-Boost
model,
was
employed
SHAP
assess
relative
importance
contributing
attributes
optimize
unveiled
water-to-binder
(W/B)
ratio,
superplasticizer,
most
factors
influencing
CS
PAC.
Furthermore,
graphical
user
interface
(GUI)
have
been
developed
practical
applications
predicting
strength.
simplifies
offers
valuable
tool
leveraging
model's
potential
field
civil
engineering.
comprehensive
evaluation
provides
insights
researchers
practitioners,
empowering
them
make
informed
choices
projects.
By
reliability
applicability
predictive
models,
contributes
preplaced
prediction.
Case Studies in Construction Materials,
Journal Year:
2024,
Volume and Issue:
21, P. e03510 - e03510
Published: July 11, 2024
Introducing
3D-concrete
printing
has
started
a
revolution
in
the
construction
industry,
presenting
unique
opportunities
alongside
undeniable
challenges.
Among
these,
major
challenge
is
iterative
process
associated
with
mix
design
formulation,
which
results
significant
material
and
time
consumption.
This
research
uses
machine
learning
(ML)
techniques
such
as
Extreme
Gradient
Boosting
(XGBoost),
Support
Vector
Machine
(SVM),
Decision
Tree
Regression
(DTR),
Gaussian
Process
(GPR),
Artificial
Neural
Network
(ANN)
to
overcome
these
A
dataset
containing
21
constituent
features
4
output
properties
(cast
printed
compressive
strength,
slump
flow)
was
extracted
from
literature
investigate
relationship
between
performance.
The
models
were
assessed
using
range
of
evaluation
metrics,
including
Mean
Absolute
Error
(MAE),
Root
Squared
(RMSE),
(MSE),
R-squared
value.
(GPR)
yielded
more
favorable
results.
In
case
cast
GPR
achieved
an
R2
value
0.9069,
along
RMSE,
MSE,
MAE
values
13.04,
170.12,
9.40,
respectively.
similar
trend
observed
for
strengths
directions
1,
2,
3.
exceeding
0.91
all
directions,
accompanied
by
significantly
lower
RMSE
(below
4.1).
also
validated
four
designs.
These
mixes
3D
tested
strength
flow.
GPR's
average
error
10.55
%,
while
SVM
slightly
9.38
%.
Overall,
this
work
presents
novel
approach
optimizing
3D-printed
concrete
enabling
prediction
flow
directly
design.
can
facilitate
fabrication
structures
that
fulfill
necessary
printability
requirements.
Case Studies in Construction Materials,
Journal Year:
2024,
Volume and Issue:
21, P. e03589 - e03589
Published: July 30, 2024
Carbon
fibers
have
often
been
added
to
concrete
as
reinforcement.
Eco-friendly
with
industrial
by-products
has
widely
studied
and
applied
green
building
materials.
Studying
the
workability
printability
of
eco-friendly
carbon
is
worthwhile.
The
are
dominating
factors
that
ensure
printing
can
be
carried
out
smoothly.
This
study
uses
a
combination
experiments
numerical
simulations
performance
fiber-reinforced
(CFREFC).
9
mixes
3D
CFREFC
under
various
combinations
different
water-binder
(w/b)
ratio
levels
superplasticizer
(SP)
dosages
were
tested.
Two
methods,
namely
consistency
fluidity
tests,
used
characterize
printability.
After
mortar
mixtures
printed
get
performance.
Finally,
relationship
between
was
established.
condition
numbered
M7
(w/b
=
0.4,
SP
0.5)
in
selected
experimental
group
source
its
simulation
parameter.
result
shows
it
feasible
using
workability,
i.e.,
fluidity,
which
increase
w/b
dosage.
Under
parameters
HC1008
printer
determined,
20
mm
nozzle
size,
50
mm/s
speed,
30
rpm
material
extrusion
14
layer
height,
fresh
not
suitable
for
3DP
application
when
less
than
48.99
more
81.96
mm,
or
166.72
200.93
mm.
When
from
56.34
65.61
172.18
183.30
best
same
parameters.
results
indicated
increased
number
layers,
bottom
model
would
deformed
by
gradual
pressure,
specific
height
loss
occur,
consistent
results.