Using same mix design, coconut shell concrete was prepared by replacement of conventional crushed coarse aggregate (CA) with waste coconut shell (CS). Coconut shell replaced conventional aggregate by 10%, 20%, 30% and 40% respectively (by volume) and the effect on compressive strength and density of concrete was observed. interesting civil engineering topics civil engineering topics for presentation civil seminar topics ppt civil engineering seminar topics 2018 best seminar topics for civil engineering seminar topics pdf seminar topics for mechanical engineers seminar topic for civil engineering pdf

1. waste water treatment using constructed
wetlands
1
Coconut Shell As Coarse Aggregate
In The Concrete
PRESENTED BY
AGLAIA

2. Introduction
waste water treatment using constructed
wetlands
2
 With increased population and modern living habits,
production of waste material is increasing at fast pace and
its disposal has become a genuine problem.
 To minimize the waste, we can utilize the waste materials
for some positive activity.
 Coconut shell can be used as a coarse aggregate to produce
light weight concrete.

3. Coconut Shell
waste water treatment using constructed
wetlands
3
 It is the strongest part covered in coconut fruit.
 This shell is naturally created to protect the inner part of
coconut.
Fig. 1 Coconut shell

4. Coconut shell Processing
waste water treatment using constructed
wetlands
4
 The coconut shell was sun dried for two months before
being crushed in the quarry.
 The crushed Coconut shell material was later transported
to the laboratory where they were thoroughly cleaned and
washed, then allowed to dry under ambient temperature.
 Properties of coconut shell aggregate is calculated by
various tests like specific gravity, bulk density, particle
size distribution etc.

5. waste water treatment using constructed
wetlands
5
Fig:2 Coconut shell before and after crushing

6. Mechanical properties of Coconut shell
waste water treatment using constructed
wetlands
6
1. Apparent Specific gravity
 It depends on the specific gravity of the minerals of which the
aggregate is composed and also on the amount of voids.
 The results showed that coconut shell has an average specific
gravity of 1.31.
 The value is about 50 percent lower than natural aggregate
hence more aggregate is needed for concrete mix.

7. waste water treatment using constructed
wetlands
7
2. Bulk density
 It gives information in respect of shape and grading of the
aggregate.
 Obtained Value ranges from 622kg/m3 to 639.48kg/m3 and it is
within the limit for light weight aggregate.
3. Particle size distribution analysis
 The sieve analysis is used to determine the particle size
distribution.
 This was carried to ensure that the resulting concrete is workable.
 The highest percentage of the aggregate passing fell between
sizes 14-20mm.

8. waste water treatment using constructed
wetlands
8
4. Impact value
 The impact values for coconut shell aggregate ranges from 1.29 to
1.32%.
 Value indicates that it can also be used as construction material.
5. Crushing value
 The average crushing value is 1.16% which is lower than 30%
maximum specified in the code.
6. Abrasion value
 Average abrasion value is 2.23% this is far less than 30%.
 The implication of this result is that coconut shell aggregate have high
resistance to wear.

9. waste water treatment using constructed
wetlands
9
7. Porosity /water absorption capacity
 The average coconut shells absorption capacity is
approximately 24%.
 This value is within the range for absorption capacity of light
weight aggregates ,which is between 5% and 30%.
8. Elongation index
 The result shows that coconut shell aggregate have index
value approx. 27%.
9. Flakiness index
 The coconut shell flakiness index test ranges from 86.09% to
86.16% .
 The result shows that coconut shell aggregate is a flaky
material.

10. waste water treatment using constructed
wetlands
10
Table- 1 Mechanical properties of Coconut shell

11. Experimental Investigations
waste water treatment using constructed
wetlands
11
 The test was carried out for M20 grade concrete.
 design of M20 grade of concrete with and without coconut
shell was carried out for maximum permissible w/c ratio of
0.55.
 The test was done by replacing CA by CS in the
proportions (i) 10%, (ii) 20%, (iii) 30% and (iv) 40% by
volume respectively.
 7 and 28 days compressive strength and density of concrete
was obtained for these concrete mixes.

12. Material used
waste water treatment using constructed
wetlands
12
 Coconut shell
 Ordinary Portland cement
 Ordinary Portland cement of 53 grades was used in this
study.
Table-2 Properties of cement

13. waste water treatment using constructed
wetlands
13
 Fine aggregate - Natural sand
 Various tests were conducted on natural sand as per standards
to find the properties of natural sand.
Table 3 Sieve analysis of fine aggregate (Sand).

14. Mix design of M20 grade concrete
waste water treatment using constructed
wetlands
14
 M20 mix design was carried out according to Indian standards.
 The concrete mix was designed for slump of 60 mm.
 Concrete was designed with and without crushed coconut
shell.
 Coconut shell replaced conventional aggregate by 10%, 20%,
30% and 40% respectively (by volume) and the effect on
compressive strength and density of concrete was observed.

15. waste water treatment using constructed
wetlands
15
Table 4: Quantities of ingredients per m3 of concrete.

16. Testing of concrete
waste water treatment using constructed
wetlands
16
 Compressive strength of concrete at 7 and 28 days was
obtained by compression testing machine.
Fig.3:Compression test on concrete cube.

17. waste water treatment using constructed
wetlands
17
Fig.4:Broken cubes after compressive strength test.

18. waste water treatment using constructed
wetlands
18
Table 5:Compressive strength of concrete with different quantity
of coconut shell.

19. Effect of shell on compressive strength
waste water treatment using constructed
wetlands
19
 Compressive strength of coconut shell concrete is
decreasing gradually with increase in quantity of coconut
shell.
 Results also indicate that coconut shell concrete gain less
strength initially (7 days) but shows rapid strength gain at
later stage.

20. waste water treatment using constructed
wetlands
20
Table 6: Effect of coconut shell quantity on compressive
strength.

21. Effect of shell on density
waste water treatment using constructed
wetlands
21
 The results show that density decreases with increase in
percentage of coconut shell.
 Decrease is about 7.5% for replacement of 40%.
 The reason for decrease in density owes to relatively low
specific gravity of coconut shell.

22. waste water treatment using constructed
wetlands
22
Table 7: Effect of coconut shell quantity on density of concrete.

23. Effect of shell on cement content
waste water treatment using constructed
wetlands
23
 Increase in percentage of coconut shell contents requires
gradual reduction in water/cement ratio so as to maintain
the desired target mean compressive strength.
 In case of 10% replacement, additional quantity of cement
required was only 3.6%.
 For 25% replacement, additional cement content of 81.6kg
per m3 of concrete was required

24. waste water treatment using constructed
wetlands
24
Table 8: Change in quantities of coarse aggregate, cement
and CS per m3 concrete

25. waste water treatment using constructed
wetlands
25
Fig. 5. Variation of cement; CA and CS content
per m3 of M20 grade concrete.

26. Conclusion
waste water treatment using constructed
wetlands
26
 Coconut shell aggregate concrete have density less than
2000 kg/m3 so they have light weight.
 It can reduce the material cost in construction because of
the low cost and its availability is abundance.
 they exhibits more resistance against crushing, impact and
abrasion, compared to crushed granite aggregate.
 There is no need to treat the coconut shell before use as an
aggregate except for water absorption.

27. Thank you
For more…. Mail to aglaiaconnect2018@gmail.com