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FLEXURAL STRENGTH OF BENDABLE CONCRETE PLATE _ UTHM _ SAMI JAMAL HUMAID

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Sami Humaid

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Transcript of FLEXURAL STRENGTH OF BENDABLE CONCRETE PLATE _ UTHM _ SAMI JAMAL HUMAID

FLEXURAL STRENGTH OF BENDABLE CONCRETE PLATE
INTRODUCTION
Faculty of Civil and Environmental Engineering
SAMI JAMAL HUMAID
AF110248

Supervised by:
Prof.Dr. Lee Yee Loon
En. Koh Heng Boon

LITERATURE REVIEW
METHODOLOGY
Concrete is a great construction material, one of the most successful ones man has ever made. That explains its popularity. It is a very good material for constructing bridges, roads, and buildings and many of the things that depend on in the daily life. Concrete, containing cement, fine aggregate, coarse aggregate and water. The tensile strength of concrete is relatively low, about
10 - 15%
of the compressive strength, occasionally 20%. Regular concrete is therefore normally reinforced with steel reinforcing bars.
BENDABLE CONCRETE
Why choose this project ?
Problem Statement
General Characteristics
The Characteristics of ECC depend on the :
natural characteristics
of fibers.
mechanical characteristics
of fibers.
diameter ranges
of fibers.
surface characteristics
of fibers.
The Family of ECC Concrete
Self-consolidating ECC
(e.g. ECC M45 and its variants) is designed for large-scale on-site construction applications
(Kong et al, 2003; Lepech and Li, 2007)

High early strength ECC (HES-ECC
) is designed
(Wang and Li, 2006a)
for applications which require rapid strength gain.

Light-weight ECC (LW-ECC)
is designed (Wang and Li, 2003) for applications where the dead load of structural members must be minimized.

Green ECC (G-ECC)
is designed
(Li et al, 2004, Lepech et al, 2007)
to maximize material greenness and infrastructure sustainability.

Self-healing ECC (SH-ECC)
emphasizes the functionality of recovering transport and mechanical properties after experiencing damage
(Yang et al, 2005; Li and Yang, 2007)
.

PVA-ECC
other fibers have been successfully utilized.

Polyethylene (PE-ECC)
(Li, 1993; Li and Wang, 2002; Kamal et al, 2007)

Polypropylene (PP-ECC)
(Takashima et al, 2003; Yang and Li, 2007)
.
Tensile Characteristics
Flexural Characteristics
Compressive Characteristics
Objectives of the Study
The main purpose of using fibers is to
increase the

energy absorption capacity
and toughness of the concrete.

The need to
decreasing the cracking
in concrete to get
high flexural and tension strength
.

The need to
increase the age
of the concrete and
decrease the maintenance cost
of the concrete specially that under vibration and impact loads such as (earthquakes).

ECC can offer structural
safety improvements
.
Limitations of the Study
(a)
Flexural load-deflection curve of an ECC.
(b)
B
C flexural specimen showing large deflection.
(c)
Fine multiple cracking on the tensile side of beam of (304 x 76.2 x 25.4 ) (after Wang and Li,2006b).
(a)
Compressive strength development of ECC (M45).
(b)
ECC specimen after compressive strength test (Wang and Li, 2006b).
Two classes of
High Performance Fiber-Reinforced Cementations Composite
(HPFRCC)
(a)
Tensile stress-elongation relationship for high strength Ductal (after Chanvillard and Rigaud, 2003) based on prism specimen with 70x70x160 mm with 150 mm gage length.
(b)
&
(c)
Tensile Stress-Strain relationship for ductile ECC (adapted from Fischer et al, 2003 and Li and Wang, 2002), based on coupon specimen 76x13x305 mm with 180 mm gage length.
(c)
(b)
A tensile stress-strain curve of an ECC, showing also the crack width development as a function of imposed tensile strain.
Micro cracking Width
Ahmed SFU, Maalej M, Paramasivam P. Strain hardening behavior of hybrid fiber reinforced cement composites. J Ferrocement 2003;33(3):172–82.
1.
Designing of Moulds
2.
Preparation of Raw Materials
1.
Fiber Content
Designing of Moulds
All plates will be designed for Determination of
Flexural Strength
.
Plywood formwork
will be formed and concrete will be mixed and casted into the desired dimension.
The test specimen with the dimension of
100 x 20 x 500 mm
.
2.
Fine Aggregate
3.
Fly ash
4.
Cement
5.
Silica fume
6.
Water
The materials will be used in this research are
steel fiber
.
For first 3 set of plates consists of
10%
of dosage fibers,and 3 set of plates consists of
20%
of dosage fibers
Fine aggregate size (
2mm-5mm
).
Fine aggregate will be in
dry status
.
Fly ash is taken from the
laboratory store
.
To avoid the cement to absorb surrounding moisture to get accurate results.
The cement that going be used is
ordinary Portland cement
.
Silica fume is taken from the
laboratory store
.
to avoid the cement t to absorb surrounding moisture to get accurate results.
Usually, drinking water from the tap will be used
3.
Mixture Proportioning
4.
Charging and mixing
5.
Casting
6.
Curing
7.
Laboratory Testing
Design Proportions by Weight for ECC- Bendable Concrete:
In this study, the flexural strength of concrete is not specified. So, trial mix is needed to obtain the highest flexural strength of specimen concrete.
Material charring sequence in to mixer:
Fresh concrete will be placed into the formwork.
The distance of placement must be as low as possible to avoid segregation.
After 24 hours of casting, all specimens will be demoulded and need to be cured.
Concrete plates will be
cured in the water tank

or cured by covering with
wet gunny sack.
The flexural strength test for the plates will be conducted at the age of
7
days,
28
days and
56
days.

Flexural Strength Test for Plates
Where:
-
F
is the maximum load (force) at the fracture point (kN)
-
L
is the length of the support span (mm)
-
b
is width of sample (mm)
-
d
is thickness of sample (mm)

Stress is reached on the surface of sample:
Stages of Laboratory Works
The Family of ECC Concrete:
General Characteristics of ECC:
ECC-Bendable concrete looks similar to Ordinary Portland Cement-based concrete, except that
it can deform
(or bend) under strain.
Concrete reinforced with fibers.
ECC has a strain capacity in the range of
3–7%
, compared to
0.1%
for ordinary Portland cement (OPC).
Fibers are a family of
micromechanically
designed material.
Concrete and its reinforcement is the most materials that civil engineer working with.

More studying on concrete ,make me more familiar with it and its behavior .

The materials and labs are available to conduct this research inside university.
To study the flexural strength of bendable concrete.

To study the effect of the substrate on the flexural strength of composite material.
In this experiment, a total of nine plates.
Three types
of concrete plates, each type has three plates will be casted and tested to failure on
7
days,
28
days and
56
days. The
3
plates with
10%
dosage of steel fibers, the
3
plate with
20%
dosage of steel fibers and
3
plates
without any dosage
of steel fibers will be the control plates for the flexural purposes.

All the plates having overall size of
100 x 20 x 500 mm
, and will be tested to failure under point loading.

The behavior of the plates will be studied via their
load-deflection
characteristic upon loading, cracking, change of neutral axis, and mode of failure.
7 days
28 days
56 days
10%
20%
0%
10%
10%
20%
20%
0%
0%
dosage of steel fibers
Final Year Project 1
T
H
A
N
K

Y
O
U
Q
&
A

Expected result
a.
The type of fiber will provide higher flexural and tensile strength of concrete plates.

b.
The good curing condition will provide higher flexural and tensile strength of concrete plates.

c.
Using fly ash and silica fume will increase the performance of concrete plate.
conducting the slump test
Examined by:
P.Madya Dr Mohd Irwan Bin Juki
Dr. Suraya Hani Binti Adnan
Pn. Masni Binti A.Majid

Problem Statement
Why choose this project ?
Objectives of the Study
Full transcript