ScienceIndia is scaling steel-slag roads after a 1.85-km project claimed lower cost and much higher strength
The government says processed steel slag can cut road-construction costs by around 40% and extend maintenance cycles in suitable applications.
THE INDIQA Research DeskPublished 14 Sept 2026Updated 14 Sept 20261 min read
The Science and Technology Ministry is pushing wider adoption of steel-slag road technology after a 1.85-km road at Raigarh, Chhattisgarh received a Guinness record for the world's longest road built with processed steel-slag aggregates.
The government says the technology can reduce construction cost by around 40% and provide up to four times the strength of conventional roads in suitable applications, while extending major maintenance intervals.
The bigger policy idea is circular infrastructure. Steel slag is an industrial by-product, so using it as road aggregate can reduce waste and demand for virgin stone. Claims about cost and durability, however, still depend on engineering conditions and wider replication.
CIVIL SERVICES VIEWStudy this development
GS-IIICircular economy, road engineering and industrial waste utilisationPrelims: HighMains: HighCore
Why this matters
The government is promoting steel-slag road technology after a record-scale project in Chhattisgarh.
Key facts
- Steel slag is a by-product of steel production.
- Processed industrial by-products can be used as construction aggregates after appropriate treatment.
Key terms
- steel slag
- circular economy
- road aggregates
- CSIR-CRRI
- waste to wealth
Background and concepts
The government is promoting steel-slag road technology after a record-scale project in Chhattisgarh.
Arguments, challenges and policy responses
- Circular economy
- Sustainable infrastructure
- Scaling indigenous engineering technologies
India’s context
India's large steel and road-building sectors create significant scope for waste-to-infrastructure solutions.
Keep in mind
Industrial slag is not used directly without processing and engineering assessment.
Practice question
How can industrial by-products contribute to both infrastructure resilience and a circular economy?
Revision summary
- Circular economy
- Processed industrial by-products can be used as construction aggregates after appropriate treatment.
- Sustainable infrastructure
- Scaling indigenous engineering technologies
- Steel slag is a by-product of steel production.
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