Eggshells and Oyster Shells Used to Make Stronger, Greener Cement
GS3Economy · S&T · Environment · Security· Pollution (air, water, plastic)· Prelims·
Waste valorization and circular economy: a relevant GS3 Environment and Science & Tech case study.
Why in news
The James Dyson Award 2026 recognized 'Circular Design Cement' for using eggshells and oyster shells as recycled aggregates to create stronger, greener cement.
Background
The project replaces conventional aggregates with blast furnace slag cement to reduce carbon emissions. Testing demonstrated bending strengths up to 16.1 N/mm², which exceeds the strength of conventional cement boards.
Facts for Prelims
- S&TCircular Design Cement uses eggshells, glass, ceramics, and oyster shells as recycled aggregates.
- FactThe material achieved bending strengths up to 16.1 N/mm².
- S&TThe process involves crushing, cutting, mixing, moulding, and curing to produce boards and tiles.
Prelims practice question
What is the maximum bending strength achieved by the Circular Design Cement as reported in the study?
- (a)12.5 N/mm²
- (b)20.0 N/mm²
- (c)14.2 N/mm²
- (d)16.1 N/mm²
Show answer
Answer: (d) 16.1 N/mm² — The testing demonstrated bending strengths up to 16.1 N/mm², which exceeds the strength of conventional cement boards.
For Mains
Q. Discuss how the adoption of circular economy principles in the construction industry can mitigate the environmental impact of infrastructure development in India.
Dimensions to cover in your answer
- Resource efficiency: Reducing reliance on virgin aggregates through industrial and organic waste valorization
- Decarbonization: Lowering the carbon footprint of cement production via blast furnace slag integration
Keywords: Circular Economy · Waste Valorization · Sustainable Construction · Carbon Mitigation · Material Science
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