Bio-Concrete Using Waste Material (Coconut Shell)

Abstract

This study presents the development of bio-concrete using waste coconut shell as a partial replacement for conventional coarse aggregate in concrete. The growing demand for sustainable construction materials has encouraged the use of agricultural waste to2 reduce environmental impact. Coconut shell, an abundant and biodegradable waste material, is utilized to minimize the consumption of natural stone aggregates. The coconut shells were cleaned, crushed, and graded before being incorporated into the concrete mix. The properties of bio-concrete were evaluated through standard tests on workability, density, and compressive strength. Results indicate that coconut shell concrete produces a lightweight material compared to conventional concrete. Although there is a slight reduction in strength, the achieved values are adequate for non-structural and low-load applications. The material also shows improved thermal and acoustic insulation properties. The use of coconut shell helps in effective waste management and reduces landfill disposal. This approach contributes to lowering construction costs and carbon emissions. Bio-concrete using coconut shell supports sustainable and green building practices. It is particularly suitable for rural infrastructure and affordable housing projects. With further research and mix optimization, its performance can be enhanced. Therefore, coconut shell bio-concrete has strong potential as an eco-friendly alternative construction material.

Introduction

The construction industry consumes a large amount of natural resources, especially coarse aggregates, which leads to depletion of stone quarries and environmental damage. To reduce this problem, bio-concrete using coconut shell waste has been introduced as a sustainable alternative. In this study, coconut shell is used as a partial replacement of coarse aggregate at 10%, 20%, and 30%. Coconut shell is lightweight, durable, and eco-friendly, making it suitable for concrete production. Its use helps reduce environmental waste, conserve natural resources, decrease the self-weight of concrete, and promote sustainable construction.

The literature survey shows that coconut shell concrete is economical and environmentally friendly. Although its compressive and tensile strength are slightly lower than conventional concrete, acceptable strength can be achieved at 10–30% replacement levels. Coconut shell concrete is lighter, slightly more flexible, and reduces the dead load of structures, making it useful for lightweight and low-cost construction. Workability may reduce due to water absorption, but admixtures can improve it. Durability under normal conditions is satisfactory with proper curing.

The objectives of the study include using coconut shell waste effectively, studying mechanical properties such as compressive, tensile, and flexural strength, evaluating durability factors like water absorption and chemical resistance, comparing it with conventional concrete, reducing concrete weight, and promoting eco-friendly and cost-effective construction materials.

The experimental program involves designing concrete mixes and replacing coarse aggregate with coconut shell at 0%, 10%, 20%, and 30%. Concrete specimens are prepared by collecting, cleaning, crushing, and mixing coconut shells with cement, sand, and aggregates. The concrete is cast into cube, cylinder, and beam moulds, compacted properly, and cured in water for 7, 14, and 28 days to improve strength and durability.

Tests conducted include the slump cone test to measure workability and the compressive strength test using a Compression Testing Machine (CTM). Results show that normal concrete has the highest compressive strength, while strength gradually decreases as the percentage of coconut shell increases. However, the concrete still provides acceptable strength for certain applications.

The cost estimation for materials such as coconut shell, cement, sand, and aggregates is approximately ?1760, making it a low-cost and environmentally friendly construction option. Overall, coconut shell bio-concrete is a sustainable material that helps manage agricultural waste while supporting green construction practices.

Conclusion

Bio-concrete using waste coconut shell is a sustainable and eco-friendly construction material that effectively utilizes agricultural waste while reducing the demand for natural aggregates. The use of coconut shell in concrete results in a lightweight material with acceptable strength for non-structural and low-load applications, along with improved thermal and acoustic properties. This approach helps lower construction costs, minimizes environmental impact, and supports green building practices. Although it is not suitable for heavy structural members, bio-concrete with coconut shell shows strong potential for low-cost housing, rural infrastructure, and precast products, making it a promising alternative material for sustainable development.

References

[1] 1akshat Dhruw, 2aaditya Shukla, 3bhumika Pradhan, 4sanjana Gupta, 5yaditya Kumar, 6priyanka Verma [2] GowriNandhan R S ¹, IsmayilHussain ², Sreelekshmi U S ³, Asish Prasad ? ¹²³ B.tech Civil Engineering Student, Dept. of Civil Engineering, St. Thomas Institute for Science and Technology, Trivandrum ? Assistant Professor, Dept. of Civil Engineering, St. Thomas Institute for Science and Technology, TrivandrumGowriNandhan R S¹, Ismayil Hussain², Sreelekshmi U S³, Asish Prasad? ¹²³B.tech Civil Engineering Student, Dept. of Civil Engineering, St. Thomas Institute for Science and Technology, Trivandrum ?Assistant Professor, Dept. of Civil Engineering, St. Thomas Institute for Science and Technology, Trivandrum [3] Md. Mostafizur Rahman Khan1, Shafayet Ullah2, Md. Taukir Ahmed3 Lecturer, Department of Civil Engineering, CCN University of Science & Technology, Chowdhury State, Kotbari, Cumilla. [4] Study on Strength parcels of Concrete Containing Coconut Shell as Coarse Aggregate Brindhalakshmi M.L# and Gunasekar S## U.G Student, Department of Civil Engineering, K.S.Rangasamy College of Technology, Tiruchengode, Namakkal – 637215, Tamilnadu. India.# Assistant Professor, Department of Civil Engineering, K.S.Rangasamy College of Technology, Tiruchengode, Namakkal – 637215, Tamilnadu. India.

Copyright

Copyright © 2026 Prof. Dhumal M. S., Prof. Bedrekar A. Y., Nagtilak S. N., Ghopne. S. S., Hajare. S. H., Kadam. A. P.. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.