Jindal Steel Builds World’s Longest Steel Slag Road, Earns Guinness World Record

New Delhi, September 12, 2026: Jindal Steel Limited, in collaboration with CSIR–Central Road Research Institute (CSIR-CRRI), has achieved a Guinness World Records title for constructing the world’s longest road built exclusively with processed steel slag aggregates. Located in Raigarh, Chhattisgarh, the project demonstrates how industrial co-products can be converted into engineered construction materials for large-scale infrastructure.
The 1.85-km, four-lane divided road, equivalent to 7.4 lane-km, has been constructed using approximately 200,000 tonnes of processed electric arc furnace (EAF) steel slag. Designed to withstand heavy commercial traffic, the road has a design loading of 65 million standard axle repetitions.
A key feature of the project is the complete replacement of conventional natural aggregates with processed steel slag. This represents a 100% substitution of virgin stone aggregates across the pavement structure, including formation, granular and bituminous layers.
Before being used in road construction, the steel slag underwent a series of processing and quality-control stages. These included controlled ageing and stabilisation, recovery of entrapped metal, crushing, screening and grading. The processed material was subsequently subjected to physical, mechanical, geotechnical and environmental testing to assess its suitability for use in the road.
The approach has enabled the project to save approximately 200,000 tonnes of virgin natural stone, reducing dependence on quarrying and the associated extraction, processing and transportation activities.
Beyond material substitution, the project has also demonstrated potential construction efficiencies. According to Jindal Steel, the pavement design is approximately 35% thinner than conventional designs, while the use of processed slag is estimated to offer construction cost savings of up to 40%.
The project represents a practical application of the waste-to-wealth and circular economy concepts, where a material generated as part of steel production is processed and redirected into another infrastructure application.
Shri Naveen Jindal, Chairman, Jindal Steel Limited, said the project demonstrates how science, technology and industry can transform industrial co-products into resources for nation-building while creating economic value and addressing environmental concerns.
The initiative has also received recognition from the scientific and technology community. Dr Jitendra Singh, Minister of Science & Technology, Government of India, described the Raigarh road as an example of translating scientific innovation into practical infrastructure applications and highlighted its potential for wider use across the country.
As part of its efforts to support broader adoption, Jindal Steel has launched SteelGrit, its brand of processed steel slag aggregates intended for use as an engineered construction material. The company has also signed a technology transfer agreement with CSIR-CRRI, creating a framework for extending the technology beyond the Raigarh project.
The development comes as India continues to expand its infrastructure while seeking ways to improve resource efficiency and reduce dependence on virgin construction materials. Steel production generates significant quantities of slag, and converting this material into usable aggregates could provide an additional source of construction material while supporting more circular industrial practices.
For Jindal Steel, the Raigarh project represents a convergence of steel manufacturing, materials engineering, road construction and resource recovery. The Guinness World Records recognition adds international visibility to a project that demonstrates how industrial by-products can be engineered for demanding infrastructure applications at scale.

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