1. Department of Civil Engineering
EXPERIMENTAL STUDY ON STRUCTURAL BEHAVIOUR OF
CONCRETE ENCASED CFST COLUMN USING
SELF COMPACTING CONCRETE WITH POLYPROPOLENE FIBER
Project Done By Project Supervisor
2. In recent days, due to the expansion of cities it is required to construct the high
storey buildings.
They are gaining popularity in high rise buildings as they avoid large columns as
a result large area can be utilized.
INTRODUCTION
3. • To study fresh and hardened properties of designed Self compacting concrete with
Polypropylene fibers.
• To observe the behaviors of Concrete Encased columns subjected to axial loading.
• To study failure pattern of Concrete Filled Tubular columns
OBJECTIVE
4. • M30 SCC concrete with concrete encased CFST column.
• To analysis the concrete encased CFST column using Abaqus Software.
SCOPE
5. • Used in buildings to avoid large size columns.
• In super high rise structures like CANTON tower.
APPLICATIONS OF CFST COLUMN
6. • Self-compacting concrete (SCC) is a special type of concrete which
can be placed and consolidated under its own weight without any
vibration effort.
• SCC is cohesive enough to be handled without segregation or
bleeding.
• SCC is a highly flowable, non-segregating, special concrete type that
can settle into formworks, and encapsulates, heavily reinforced,
narrow and deep sections by means of its own weight.
• SCC does not require compaction using external force from
mechanical equipment such as immersion vibrators.
Self Compacting Concrete
7. • Polypropylene fibre (PPF) is a kind of linear polymer synthetic
fibre obtained from propylene polymerization.
• It has some advantages such as light weight, high strength, high
toughness, and corrosion resistance.
POLYPROPYLENE FIBER
8. PROPERTIES OF POLYPROPYLENE FIBER
Sl.no Physical properties Values
1. Tensile Strength 3.5 to 5.5
2. Elongation 40 to 100
3. Moisture absorption (%) 0 to 0.05
4. Softening point (ÂşC) 140
5. Melting point (ÂşC) 165
6. Relative Density 0.91
7. Thermal conductivity 6.0 (with air is 1.0)
9. • Polypropylene fibre (PPF) is a kind of polymer material with
light weight, high strength, and corrosion resistance. The crack
resistance of concrete can be improved by adding PPFs.
• The PPF can prevent water and other harmful ions entering into
concrete.
ADVANTAGES OF POLYPROPYLENE FIBER
10. LITERATURE REVIEW
Sl.
no
Title of work Author Name Details of
Publication
Objective of
study
Methodology
adopted
Result
1 Influence of M
sand in self
compacting
concrete with
addition of
steel fiber
V. Gokulnath,
B. Ramesh,
S. Sivashankar
2019 Elsevier
Ltd
Department of
Civil
Engineering,
Saveetha
School of
Engineering,
SIMATS,
Chennai, Tamil
Nadu, India
https://doi.org/1
0.1016/j.matpr.
2019.11.270
2214-7853
The work deals
with the
workability and
strength studies
on steel fibre
reinforced self-
compacting
concrete of
grade M25 with
steel fibre.
In SCC the steel
fibre total is
0.3%, 0.6%,
0.9%, 1.2% has
been taken.The
steel fibre
percentage was
varied by total
weight of
concrete material
Addition of
fibres to self-
compacting
concrete
increased the
28 days
splitting
tensile
strength and
flexural
strength.
11. LITERATURE REVIEW
Sl.
no
Title of work Author Name Details of
Publication
Objective of
study
Methodology
adopted
Result
2 Mechanical
properties of
self-compacting
concrete
reinforced with
polypropylene
fibres
O. Gencel,
C. Ozel,
W. Brostow and
G. Martinez-
Barrera
Materials
Research
Innovations
Received 16
November 2010;
accepted 8
February 2011
DOI
10.1179/1433075
11X1301891792
5900
The workability
and mechanical
properties of SCC
with fly ash
reinforced with
monofilament
polypropylene
fibres were
investigated
Slump flow, J ring,
V funnel tests were
conducted for
evaluating the
fluidity, filling
ability of the fresh
concretes. Unit
weight,
compressive
strength, splitting
tensile strength,
flexural strength,
pulse velocity and
elasticity modulus
of concrete were
determined.
The
polypropylene
fibres enhance
the strength of
SCC
significantly,
without
causing well
known
problems
associated with
steel fibres.
12. LITERATURE REVIEW
Sl.
no
Title of work Author Name Details of
Publication
Objective of
study
Methodology
adopted
Result
3 Axial
compressive
behaviour of
steel fibre
reinforced
self-stressing
and self
compacting
concrete-filled
steel tube
columns
Na Lia,
Yiyan Lu,
Shan Li,
Danying Gao
2020 Elsevier
Ltd
Received 16
December
2019; Received
in revised form
5 July 2020;
https://doi.org/
10.1016/j.engst
ruct.2020.1111
08
To explore the
effects of initial
self-stress in
concrete and
steel fibre on
the compressive
behaviour of
concrete-filled
steel tube
(CFST)
columns.
The steel tube
thickness of 2.5
mm, 3.5 mm and
4.25 mm was
used.
The concrete
strength grade of
C40, C50 and
C60 was used to
obtain different
expansion
deformations.
Formulas are
proposed to
predict the
load carrying
capacity of
CCFST
columns
under axial
compression.
13. LITERATURE REVIEW
Sl.
no
Title of work Author Name Details of
Publication
Objective of
study
Methodology
adopted
Result
4 Self
Compacting
Concrete
using
Polypropylene
Fibers
B. Sandhya
Rani,
N. Priyanka
International
Journal of
Research
Studies in
Science,
Engineering
and
Technology
Volume 4,
Issue 1, 2017
the main focus
is on determine
the maximum
quantity of poly
propylene fibers
can be possibly
used in SCC
and the
replacement of
cement with
FLYASH
The maximum
replacement can
be done up to
40% in SCC with
fly ash
The
maximum
quantity of
fiber can be
used in SCC
was 0.75% to
1%.
14. LITERATURE REVIEW
Sl.
no
Title of work Author Name Details of
Publication
Objective of
study
Methodology
adopted
Result
5 Experimental
Study on
Polypropylene
Fiber
Reinforced
Self
Compacting
Concrete
Najilah Farouk,
I.Padmanaban
International
Journal of
ChemTech
Research
Vol.10 No.14,
pp 345-352,
2017
Experimental
study on
mechanical
performance of
polypropylene
fiber reinforced
concrete
(PFRC) under
compression,
split tensile and
flexural
loading.
The M30 grades
of concrete mixes
and
polypropylene
fibers of length
30 mm at volume
fractions of
0.5%. 1.0%,
1.5% and
2.0%were used.
The
polypropylen
e fiber dose
not
contributes
on
compressive
strength
much better
but it reduce
the cracks
and crack
propagation.
15. LITERATURE REVIEW
Sl.
no
Title of work Author Name Details of
Publication
Objective of
study
Methodology
adopted
Result
6 Influence of
Polypropylene
and Steel
Fibers on the
Performance
and Crack
Repair of
Self-
Compacting
Concrete
Mohammed A.
Abed,
Jan Fort,
Abdulkarim
Naoulo and
Amr Essa
Materials 2021,
14, 5506.
https://doi.org/
10.3390/ma141
95506
To evaluate the
epoxy injection
technique used
to strengthen
fiber-reinforced
self-compacting
concrete
(FRSCC) with
high strength
Five mixes were
designed and
placed using
different types
(steel and
polypropylene)
and contents
(0%, 0.25%, and
0.45% by
volume) of
fibers.
Splitting
tensile,
flexural, and
shear
strengths
were
enhanced by
increasing
fiber content.
16. LITERATURE REVIEW
Sl.
no
Title of work Author Name Details of
Publication
Objective of
study
Methodology
adopted
Result
7 Failure
mechanism of
full-size
concrete filled
steel circle and
square tubes
under uniaxial
compression
CAI JingMing,
PAN JinLong &
SHAN QiFeng
Key Laboratory
of Concrete and
Pre-stressed
Concrete
Structures of
Ministry of
Education,
Southeast
October 2015
Vol.58 No.10:
1638–1647
doi:
10.1007/s11431-
015-5890-4
The failure
mechanisms of
full-size concrete
filled steel tubes
(CFST) under
uniaxial
compression
Existing
experimental
results were
employed to verify
the validity of the
finite element
models of CFST
specimens. Then,
the numerical
analysis was
further conducted
under uniaxial
compression.
The increase of
concrete
strength and
steel strength
has little
influence on
the axial
compression
behaviors of
CFST columns
after peak
strength.
17. LITERATURE REVIEW
Sl.
no
Title of work Author Name Details of
Publication
Objective of
study
Methodology
adopted
Result
8 Behaviour of
Double Skinned
Composite
Columns with
Concrete Filled
Tubular
Columns
Hasan
Hastemoglu
Suleyman
Demirel
University,
Faculty of
Architecture,
32260, Sparta,
Turkey
DOI:
10.4172/2168-
9717.1000194
Tests on the
specimens were
made by applying
axial loads
ANSYS modelling
and checking past
experimental
results
The result
shows that
there is little
difference in
deformations
between the
ANSYS and
experimental
results.
18. LITERATURE REVIEW
Sl.
no
Details of
Publication
Author Name Title of work Objective of
study
Methodology
adopted
Result
9 Materials 2020
Civil Engineering
Department,
College of
Engineering
Technology, Houn
61160, Libya
doi:10.3390/ma130
10023
Faesal
Alatshan, Siti
Aminah
Osman, Fidelis
Mashiri and
Roszilah
Hamid
Explicit
Simulation of
Circular CFST
Stub Columns
with External
Steel
Confinement
under Axial
Compression
The analytical
behaviour of
circular CFST
short columns with
an external ring or
spiral
confinements
which are
subjected to axial
loading.
Three typical CFST
stub columns with
external rings,
external spiral, and
without external
confinements were
modeled in order to
investigate their
analytical behavior
CFSTs with
external
confinement
show higher
strength and
better ductility.
The presence of
external
confinements
can remarkably
improve the
steel-concrete
interaction
stress,
especially after
the elastic stage.
19. LITERATURE REVIEW
Sl.
no
Details of
Publication
Author Name Title of work Objective of
study
Methodology
adopted
Result
10 Thin-Walled
Structures 140
(2019) 195–208
Tao Pi, Yu
Chenb,, Kang
Heb, Shaohua
Hana, Jun
Wana
Study on circular
CFST stub
columns with
double inner
square steel
tubes
This paper mainly
investigated the
behavior of CFST
stub columns
under axial
compressive load.
The main
parameters such
as concrete
compressive
strength, hollow
area ratio and
eccentricity ratio
were studied
a simplified
formula was
derived to calculate
ultimate bearing
capacity of DIS-
CFST stub
columns under
axial compression.
when the hollow
ratio was small,
it had little effect
on the ultimate
load-carrying
capacity of
CFST stub
columns.
However, the
ultimate bearing
capacity of
specimens
significantly
decreased when
hollow area ratio
was large.
20. LITERATURE REVIEW
Sl.
no
Details of
Publication
Author Name Title of work Objective of
study
Methodology
adopted
Result
11 2019
Published by
Elsevier Ltd. Thin-
Walled Structures
141 (2019) 509–
525
https://doi.org/10.1
016/j.tws.2019.04.
016
J.J. Xua, Z.P.
Chenb, X.Y.
Zhaoc, C.
Demartinoa, T.
Ozbakkaloglu,
J.Y. Xuee
Seismic
performance of
circular recycled
aggregate
concrete-filled
steel tubular
columns: FEM
modelling and
sensitivity
analysis
Recycled
concrete
aggregates
(RCAs) generated
from the
construction and
demolition waste
are an alternative
to natural
aggregates to
produce structural
concrete
A fiber-based FEM
model is first
proposed and then
validated using the
available
experimental data
on the hysteresis
loops of these
columns.
RCA
percentage has
a less
remarkable
effect on the
seismic
performance of
CFST
manufactured
using RCAs,
although this
effect should
be considered
in the seismic
assessment
21. LITERATURE REVIEW
Sl.n
o
Details of
Publication
Author
Name
Title of work Objective of
study
Methodology
adopted
Result
12 2021 Elsevier
Ltd.
Engineering
Structures 235
(2021) 112066
https://doi.org/
10.1016/j.engst
ruct.2021.1120
66
Hong-Song
Hu, Kang
Lin, Bahram
M. Shahrooz
, Zi-Xiong
Guo
Revisiting the
composite
action in
axially loaded
circular CFST
columns
through direct
measurement
of load
components
An innovative
testing method
was devised to
directly
measure the
load
components of
circular CFST
columns under
axial
compression.
Six innovative
specimens with
varying concrete
strength and
diameter-to-
thickness (D/t)
ratio and their
conventional
counterparts
were tested.
The
development
of hoop
stresses in
the steel tube
tends to
reduce the
correspondin
g axial
stresses.
23. ď‚· The structural performance on self- compacting concrete with the addition
of polypropylene fiber by the weight of cement by 1.2%.
ď‚· Polypropylene Fiber has more advantage over Steel fiber
ď‚· Polypropylene fiber has less weight compared to steel fiber.
ď‚· The workability of the concrete reduced with excess amount of fibers.
ď‚· The polypropylene fibres enhance the strength of SCC significantly, without
causing well known problems associated with steel fibres.
SUMMARY OF LITERATURE REVIEW
24. METHODOLOGY
Hardened Concrete Test Concrete Encased
CFST Column
Destructive Testing Axially loaded Column
Cube Cylinder
Compressive
Strength
Split Tensile
Strength
Poisson's
Ratio
Failure Mode
Strength
Parameters
Ductility
EXPERIMENTAL STUDY ON STRUCTURAL BEHAVIOUR OF
CONCRETE ENCASED CFST COLUMN USING
SELF COMPACTING CONCRETE WITH POLYPROPOLENE FIBER
Fresh Concrete
test
Slump Cone
Test
V Funnel Test
L box Test
U box Test
Software Simulation
Abaqus
Conclusion
25. MATERIAL SPECIFICATION
Grade of Concrete M30
Grade of Steel Fe 415
Type of Cement OPC
Fine Aggregate M-Sand (Locally available)
Course Aggregate
12mm aggregate retained 10mm
sieve
Fiber Polypropylene Fiber
Fiber Content 1.2%
Fiber Cost (Around Coimbatore) 700 / kg
26. • Column size
150mm X 150 mm
Length 600 mm
• Square encasement size
50mm X 50mm
• Rectangular encasement size
50mm X 75mm
COLUMN DETAILS
39. It is a software application used for both the modeling and analysis of
components and assemblies (pre-processing) and visualizing the finite
element analysis result.
ABAQUS SIMULATION
55. COMPARISON OF DEFLECTION
EXPERIMENTAL WITH ANALYTICAL
SPECIMEN RESULTS
31.2 30.1
34.8
27.3
29.5
28.25 29 29.975
22.5
26
0
5
10
15
20
25
30
35
40
Convenctional
Column
Rectangle Filled
Column
Rectangle
Hollow Column
Square Filled
column
Square hollow
column
Axial
Deflection(mm)
SPECIMENS
EXPERIMENTAL AND ANALYTICAL COMBINED
EXPERIMENTAL Deflection (mm) ANALYTICAL Deflection (mm)
The maximum displacement was recorded in Rectangle Hollow Specimen and minimum displacement
in Square concrete filled column
56. ď‚· It was found that the compressive strength values increased by 8.11% compared to
conventional concrete.
ď‚· It was found that the split tensile strength of Self compacting concrete was 17.04%
more than the conventional concrete.
ď‚· The flexural strength is increased by 5.07%.
ď‚· The maximum Load is carried by Square Filled Column in Simulation is 924.678 kN.
ď‚· The maximum displacement was recorded in Rectangle Hollow Specimen and
minimum displacement in Square concrete filled column.
Results
57. ď‚· The concrete encased square section with concrete filled in it withstood 3.3% more
load compared to the conventional RCC column and also had less deflection due to
equal distribution of load on all four sides of the section.
ď‚· The CFST column encased with square specimen provides good resistance to load
because of the distribution of load in all direction and Rectangle hollow specimen
produces more deflection because of the uneven surfaces in the column.
ď‚· Simulation for concrete encased steel tubular column was done on Abaqus 2020 and it
was found that the core gets weaker at first followed by the mild steel tube and then
the external concrete.
Conclusion
