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A 1.85-km, four-lane road at Raigarh, Chhattisgarh, built by Jindal Steel with CSIR-Central Road Research Institute (CSIR-CRRI), received the Guinness World Records title for the longest road built exclusively with processed steel slag aggregates on 12 September 2026.
About 2 lakh tonnes of processed electric arc furnace (EAF) steel slag were used across the full pavement depth, and the road is designed for 65 million standard axles of heavy traffic.
Steel slag roads are claimed to be 30-40% cheaper and to last up to three times longer than standard bitumen roads.
The two partners signed a technology transfer agreement and launched 'SteelGrit', a brand of processed slag aggregates.
A by-product of steel-making in electric arc or basic oxygen furnaces, made mainly of calcium, magnesium, manganese and aluminium silicates and oxides. Once processed, its high crushing strength and skid resistance let it replace quarried stone aggregate.
Simple Analogy: A steel plant's leftover rock replacing stone blasted from hills.
India's first steel slag road at Hazira, Surat (Gujarat), with ArcelorMittal Nippon Steel India and CSIR-CRRI
Raigarh road wins Guinness record as the longest steel slag road
40-km steel slag road at Jindal Steel's Angul plant, Odisha
National laboratory for road and transport research, founded 1952; developed the steel slag road technology
India's largest R&D organisation under the Department of Scientific and Industrial Research; founded 26 September 1942; the Prime Minister is its President
GS Paper III > Infrastructure; Environment > Waste Management and Circular Economy
General Awareness > Records, Science and Technology
In the context of which one of the following are the terms 'pyrolysis and plasma gasification' mentioned?
Answer: Waste-to-energy technologies
Steel slag can be the material for which of the following? 1. Construction of base road 2. Improvement of agricultural soil 3. Production of cement Select the correct answer using the code given below:
Answer: 1, 2 and 3
Consider the following statements: Statement I: Circular economy reduces the emissions of greenhouse gases. Statement II: Circular economy reduces the use of raw materials as inputs. Statement III: Circular economy reduces wastage in the production process. Which one of the following is correct in respect of the above statements?
Answer: Both Statement II and Statement III are correct and both of them explain Statement I
Steel-making furnace that melts scrap or sponge iron using electric arcs; its residue is EAF slag
Crushed stone, gravel or substitutes that form the load-bearing skeleton of a road
Unit of cumulative design traffic load a pavement must carry over its life