Behavior of Coconut Fiber and Recron Fiber in Concrete

IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
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Volume: 04 Issue: 04 | Apr-2015, Available @ http://www.ijret.org 128
BEHAVIOR OF COMBINATION OF COCONUT FIBER AND RECRON
FIBER IN CONCRETE
Harish Kumar1
, S.Anandh2
1
Student, Construction Engineering and Management, SRM University, Tamil Nadu, India
2
Assistent Professor, Construction Engineering and Management, SRM University, Tamil Nadu, India
Abstract
Concrete is strong in compression, as aggregate efficiently carries the compression load. However, it is weak in tension as the
cement holding the aggregate in place can crack, allowing the structure to fail. This weakness had been adjusted over many
decades by using a system of reinforcing bars (rebar) to create reinforced concrete; so that concrete primarily resists compressive
stresses and rebar resist tensile and shear stresses and rebar resist tensile and shear stresses. It has been recognised that addition
of small, closely spaced and uniformly distributed fibres to concrete would act as a crack arrester and would significantly
improve the its static and dynamic properties
Keywords: fibre, shear stresses, rebar, concrete
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1. INTRODUCTION
Fibre reinforced concrete can be defined as composite
material consisting of mixture of cement , mortar or
concrete and discontinuous, discrete, uniformly dispersed
suitable fibres. The use of randomly oriented, short fibres to
improve the physical properties of a matrix in an ancient
concept. For example, fibres made of straw or jute has been
used to improve the properties of bricks for thousands of
years. Natural fibres are made from plant, animal and
mineral sources. The most used natural fibres are cotton.,
bamboo and coconut. Metallic fibres are made of either steel
or stainless steel. Polymer fibres are subset of man-made
fibres, which are based on synthetic chemicals rather than
arising natural fibres by purely physical process. Fibre
reinforced concrete is increasingly used because of the
advantage of increased static and dynamic tensile strength ,
energy absorbing characteristics and enhanced fatigue
strength. The uniformly dispersal of fibres through the
concrete provides isotropic properties not common to
traditional reinforced concrete. Fibre reinforced concrete has
been tried on overlays of air-field, road pavements,
industrial floorings, bridge decks , channel lining, explosive
resistant structures.
The following are the factors affecting the properties of
FRC. The properties of FRC would obviously depend upon
the efficient transfer of stress between matrix and fibres,
which largely dependent on the
• Type of fibre used
• Orientation of fibre
• Fibre geometry
Recron is a state of art reinforcing material which is used to
increase strength in a variety of applications like automotive
battery, paper, infiltration fabrics and for improving the
quality of construction.
Coconut fibre is extracted from the outer shell of coconut.
These fibres are mostly used in products such as floor mats,
doormats
1.1 Objective
• To determine the strength of fibre concrete
• To compare the strength of the conventional
concrete, coconut fibre and recron fibre concrete
• To do plastering using recron fibre and to reduce
the size of the roof slab, beams and columns
1.2 Scope
• Fibres can be used precast flyover
• Replacing fibres in construction
• Crack should be arrested during hydration
• Fibres are used for airport pavements
1.3 Mix Design
Table 2 Mix design
Water
cement
ratio (lit)
Cement
content (kg)
Fine
aggregate
content (kg)
Coarse
aggregate
content(kg)
212.12 406.0 624.14 1032.27
0.52 1 1.537 2.542
The various materials used in this project work are shown in
the table 3 below
1.4 Material Properties
Table 3 Properties of materials used
S.No Description Parameter
1 Grade of concrete M20
2 cement OPC 53 grade IS 269-
1976

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3 Fine aggregate Sand conforming to zone
II of IS 383-1978
4 Coarse aggregate 10-12 mm nominal size
5 Type and shape
of CA
Angular
6 w/c ratio 0.52
7 Steel fiber Undulated (0.6mm dia
and 36mm length )
8 Polypropylene
fiber
Bar chip fibers (42mm
length)
9 Age of curing 7 days, 14 days and 28
days
2. RESULTS AND DISCUSSION
2.1 Test Results for Compressive Strength
The coconut fibre and recron fibre are mixed with PCC in
different fibre volume to cast cubes and the fibre volume
showing average compressive strength. The test results
shows the 7, 14, 28 days compressive strength of coconut
fibre , recron fibre and mixed with PCC. From the results
increase in strength has been obtained in hybrid fibre in 28
days. The decrease in strength had been obtained in coconut
fibre in 28 days
Table 4 Test results of compressive strength (7, 14 and 28
days )
Type of fibre No.of days Compressive strength in
N/mm2
Fibre percentage
0.5 1.0
Coconut fibre
7 days 16.42 17.67
14 days 18.06 19.49
28 days 20.17 20.80
Recron fibre
7 days 16.67 18.67
14 days 18.49 21.49
28 days 20.24 23.56
Hybrid fibre
7 days 16.48 18.57
14 days 20.11 22.85
28 days 21.08 24.24
Table 5 Test results of tensile strength (7, 14 and 28 days )
Type of fibre No.of days Split tensile strength
in N/mm2
Fibre percentage
0.5 1.0
Coconut fibre
7 days 1.66 1.65
14 days 2.26 2.74
28 days 2.61 3.19
Recron fibre
7 days 1.58 2.09
14 days 2.43 2.85
28 days 2.83 3.17
Hybrid fibre
7 days 1.74 1.81
14 days 2.67 2.78
28 days 3.1 3.23
Table 6 Test results of flexural strength (7, 14 and 28 days )
Type of fibre No.of days Split tensile strength
in N/mm2
Fibre percentage
0.5 1.0
Coconut fibre
7 days 2.02 2.10
14 days 2.52 3.48
28 days 2.83 4.06
Recron fibre
7 days 1.86 2.35
14 days 2.86 3.15
28 days 3.33 3.94
Hybrid fibre
7 days 2.07 2.31
14 days 3.18 3.54
28 days 3.7 4.12
The FRC cubes with fibre volume of 1% achieved
maximum flexural strength for coconut fibre , recon fibre
and hybrid fibre respectively. Henceforth, for further studies
in strength behaviour of beam 1% fibre volume will be used.
The flexural strength represents the highest stress
experienced within the material at its moment of rupture.
The flexural strength would be the same as the tensile
strength if the material were homogenous.
0
5
10
15
20
25
7 14 28
coconut
recron
hybrid
Fig 1 Compressive strength of 0.5% mixed coconut, recron
& hybrid fibre
0
0.5
1
1.5
2
2.5
3
3.5
7 14 28
coconut
recron
hybrid
Fig 2 Split tensile strength of 0.5% mixed coconut, recron &
hybrid fibre

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Fig 3 Flexural strength of 0.5% mixed coconut, recron &
hybrid fibre
0
5
10
15
20
25
30
7 14 28
coconut
recron
hybrid
Fig 4 Compressive strength of 1% mixed coconut, recron &
hybrid fibre
0
0.5
1
1.5
2
2.5
3
3.5
7 14 28
coconut
recron
hybrid
Fig 5 Split tensile strength of 1% mixed coconut, recron &
hybrid fibre
0
1
2
3
4
5
7 14 28
coconut
recron
hybrid
Fig 6 Flexural strength of 1% mixed coconut, recron &
hybrid fibre
3. CONCLUSION
Based on the results obtained in the present study and the
discussion of the following conclusions are made:
• Compressive strength test are carried on FRC cubes
with varying fibre quantity confirms that the
maximum tensile strength is attained when the fibre
quantity is 1% for coconut fibre and 1% for recron
fibre
• Split tensile strength test are carried on FRC
cylinders with varying fibre quantity confirms that
the maximum tensile strength is attained when the
fibre quantity is 1% for coconut fibre and 1% for
recron fibre
• Flexural tensile strength test are carried on FRC
beams with varying fibre quantity confirms that the
maximum tensile strength is attained when the fibre
quantity is 1% for coconut fibre and 1% for recron
fibre
• Addition of recron fibre and coconut fibre into PCC
increased the split tensile strength of concrete upto
1.36 times and 1.55 times
ACKNOWLEDGEMENTS
First and foremost I thank the Almighty, who has given me
the strength to complete this task. Thereafter I would like to
express my sincere gratitude and appreciation to the
generosity of the following people who contributed to the
success of this study.
• My guide, Professor.S.Anandh for his continuous
professional guidance in keeping me focused on the
research topic, for his on-going support and
motivation throughout the study.
REFERENCES
[1]. Ahmed.L and A.Ansellet (2010), “efficiency of fiber in
concrete”.cement and concrete research , pages 1031_1036
[2]. Chaudari P(2006), “Dramix artificial fibres for SFRS
and SFRC”, The Indain Concrete Journal , Page No.939
[3]. IS:456 (2000),” Plain and Reinforced Concrete Code of
Practise”
[4]. IS:1893 Part 1(2002) ,”Criteria for earthquake resistant
design of structure”

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BIOGRAPHIES
Harish Kumar, PG Student Department of
Civil Engineering, SRM University,
Katangulathur, Chennai
Anandh.S, Assistant Professor,
Department of Civil Engineering, SRM
University, Katangulathur, Chennai

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