Coconut shell as coarse aggregate in the concrete
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This document discusses the use of coconut shell as a coarse aggregate in the production of lightweight concrete for wastewater treatment using constructed wetlands. It details the mechanical properties of coconut shell, including specific gravity, bulk density, and impact value, and outlines methods for mixing and testing concrete with varying percentages of coconut shell replacement. The findings indicate that while compressive strength decreases with increased coconut shell content, it is a viable option for reducing construction material costs and improving resistance to wear.
Coconut shell as coarse aggregate in the concrete
- 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