2. ABSTRACT
The presented paper deals with utilization of
raw and treated coir pith as potential
component of cementitious composites.
The main aim of our project is reducing the
cement by replacing the coir pith and also
reducing the carbon dioxide produced from
the cement.
3. INTRODUCTION
In this paper M35 grade of concrete is
preferred.
In that 16 mixes of various percentage of 5, 10,
15 & 20 of coir pith is replacing for the
Ordinary Portland cement and pozzolana
Portland cement were used.
The coir pith is treated with sodium hydroxide
and silica fume is added to increases the
cementitious nature of concrete.
5. Literature Review
Studies on LWC
Study On Mix Proportions Of LWC
Tests of Fresh concrete
Analysis of test results
Conclusions
Reference
Determination of properties of
constituent materials
6. LITERATURE REVIEW
This research study started with an extensive
literature review performed in order to understand the
properties, characteristics and applications of Light
Weight concrete
Experimental Study Of Coir Fibre As Concrete
Reinforcement Material Increment Based Composites
by J.Sahaya ruben & Dr.G.Baskar
7. The overall goal of this research is to investigate the
behavioural study n interest as a sustainable fibre
composite material, due to some specific mechanical
property which can be compared to artificial fibre.
The Coir fibre is treated using natural latex before
using in concrete, so that it is not be affected by
moisture content presented in concrete. In this
experimental study of 28 days the compressive
strength and split tensile strength are carried out using
different coir fibre length of 20mm, 25mm and 30mm
respectively of different percentage as0.5%, 0.75%
and 1%. Encouragement should be given for the use
of natural fibres which are locally available materials,
in the field of civil engineering.
8. STUDIES OF LWC
The weight of building on foundation is an important
factor in the design, particularly in case of weak soil
and tall structures. In framed structure, the beam and
column have to carry load of wall and floor.
If these wall and floor are made of light weight
concrete it will result in considerable economy.
It helps reduce the dead load, increase the progress of
building and lowers the hauling and handling cost.
9. MIX PROPOSITION
Mix proposition of this project is M35 grade of
concrete is taken.
In which sixteen types of different mix proposition is
carried out in ordinary portland cement and pozzolana
portland cement.
Mix ratio = 1:1.6:2.2
10. • Mix proposition for conventional for both OPC &
PPC
Materials Quantity
Cement(kg/m3) 445
Fine aggregate((kg/m3) 764.31
Coarse Aggregate(kg/m3) 991.32
Water(l/m3) 197
w/c ratio 0.45
11. SIXTEEN DIFFERENT MIXES FOR PPC & OPC
MIX % OF COIR PITH % OF SILICA FUME TREATED WITH NAOH
1 5 2 Yes
2 5 - Yes
3 10 10 No
4 10 10 Yes
5 15 10 Yes
6 15 10 No
7 20 5 Yes
8 20 10 Yes
9 20 10 No
10 20 - No
11 5 2 Yes
12 5 - Yes
13 10 - Yes
14 20 5 Yes
15 20 10 Yes
16 20 - yes
12. RATIO OF SILICA FUMES, COIR PITH & NAOH ARE
SHOW IN BAR CHAT FOR PPC
13. RATIO OF SILICA FUMES, COIR PITH & NAOH
ARE SHOW IN BAR CHAT FOR OPC
18. COIR PITH
Coir is stiff coarse fiber that has been obtained from
the outer husk of the coconut.
Coir is a flexible natural yarn that is hauled out from
mesocarp tissue, or husk of the coconut fruit.
coir pith is a natural
material and it is easy
available in our locality.
19. FINE AGGREGATE
Fine aggregate used for LWC should be properly sieved
to give minimum void ration and free from deleterious
materials like clay, silt and chloride contamination etc.,
And its Specific gravity is 2.61.
The sand is sieved
in 4.75mm seive.
20. COARSE AGGREGATE
In this project , we had used 20mm size of aggregate.
And its Specific gravity is 2.71.
The sieve analysis is performed by arranging the
various sieves one over the other in the order of their
mesh openings – the
largest aperture
sieve at the top and
the smallest aperture
sieve at the
bottom.
21. SILICA FUMES
Silica fume is a very fine non-crystalline SiO2, is a
byproduct of producing silicon metal or ferrosilicon
alloys.
It is made at a temperature of approximately 2000oC.
It acts as an excellent pore-filling material.
It can be used in proportions of 5-10% of cement
content in a mix.
Silica fume also referred to as
micro silica or condensed silica
fume, is another material that is
used as artificial pozzolanic
admixture.
22. SUPER PLASTICIZERS
Super plasticizers produce extreme workability and
thus flowing concrete.
They achieve reduction in the water content without
loss of workability.
Their use generally leads to an overall reduction in
the cost.
Super plasticizers are water reducers, which are
capable of reducing water contents by about 30%.
23. SODIUM HYDROXIDE
The sodium hydroxide is used to increase the
bonding strength change the structure of the coir pith.
Sodium hydroxide is taken from total quantity of
coir pith as 5%.
24. RESULT & DISCUSSION
Test results of average compressive strength of cubes at
the age of 7days, and 28 days for PPC
S. No. Mix
Average compressive strength (N/mm2)
7 days 28days
1 Mix-1 26.80 36.06
2 Mix-2 32.60 43.70
3 Mix-3 17.80 23.80
4 Mix-4 20.00 26.80
5 Mix-5 08.90 11.90
6 Mix-6 05.70 07.69
7 Mix-7 06.80 09.00
8 Mix-8 10.80 14.40
9 Mix-9 04.20 05.50
28. Test results of average Split Tensile
strength at the age of 7days, and 28
days for PPC
S. No. Mix
Average Split Tensile strength (N/mm2)
7 days 28days
1 Mix-1 1.75 2.97
2 Mix-2 1.570 2.80
3 Mix-3 1.025 2.15
4 Mix-4 1.270 2.60
5 Mix-9 0.740 1.24
30. Test results of average Split Tensile
strength at the age of 7days, and 28
days for OPC
S. No. Mix
Average Split Tensile strength (N/mm2)
7 days 28days
1 Mix-11 1.87 3.2
2 Mix-12 1.69 2.9
3 Mix-13 1.54 2.7
4 Mix-16 0.88 1.5
32. Test results of average Flexural
strength at the age of 7days, and 28
days for PPC
S. No. Mix
Average Split Tensile strength (N/mm2)
7 days 28days
1 Mix-1 2.00 6.10
2 Mix-2 1.75 5.30
3 Mix-3 0.95 2.55
4 Mix-4 1.20 3.70
34. DISCUSSION
The different mixes give different values from higher
to lower value .
The silica fume is added to increase the bonding
strength of concrete.
And also sodium hydroxide is used to change the
structure of coir pith. if the sodium hydroxide is
added the weight of the concrete is increased and get
strengthen .
41. CONCLUSION
In this project, an intensive study has been made on
the development of Light weight concrete. Sixteen
different concrete mixes have been used to get Light
weight concrete. Cubes, Cylinders & Beams have
been cast using this Sixteen different mixes and their
properties of the fresh and hardened state have been
experimentally found out. Based on the experimental
investigation, the following conclusions could be
drawn:
Sixteen different concrete mixes have been identified
to get Light weight concrete having cubes
compressive strength in the range 3.4 MPa to 43.7
MPa.
42. Sixteen different concrete mixes have been identified
to get Light weight concrete having cylinder Split
Tensile strength in the range 0.88MPa to 3.2 MPa.
Sixteen different concrete mixes have been identified to
get Light weight concrete having prism Flexural strength
in the range 0.95MPa to 6.1 MPa.
5% Coir Pith & 2%Silica with Naoh mix proportions
gives more compressive strength than the other Fifteen
mix proportions.
