'Waste to Wealth' is central to India's sustainable development strategy — illustrate with examples from the infrastructure sector.

'Waste to Wealth' treats industrial residue not as a disposal burden but as a substitute raw material. In infrastructure — India's largest consumer of natural aggregates — this converts a circular-economy principle into measurable savings of cost, carbon and quarried stone, as steel slag road technology demonstrates [1].

Scale of the waste challenge

• Every tonne of steel produced generates about 200 kg of slag; national slag output is around 19 million tonnes a year, projected to reach 60 million tonnes by 2030 [1].
• Unused, this occupies land and leaches contaminants; processed, it replaces mined aggregate, easing pressure on hills and riverbeds.

Illustration 1: Steel slag roads

• CSIR-Central Road Research Institute (CRRI), New Delhi, pioneered processed steel-slag aggregate for all bituminous pavement layers [2].
• India's first six-lane slag road, NH-6 to Hazira Port, Surat (2022), used about one lakh tonnes of processed EAF slag from ArcelorMittal Nippon Steel, with no natural ballast at all [3].
• The technology scaled to national highways with the first slag section on NH-66 Mumbai–Goa [4].

Illustration 2: Economic and durability gains

• Slag roads are significantly cheaper than conventional paving and last about ten years against three to four years for bitumen, sharply cutting maintenance outgo [1].
• Superior weather resistance makes them suited to snow-bound and rain-prone Himalayan terrain, where road recurrence costs are highest [1].

Illustration 3: Institutional convergence

• Standardisation followed pilots: NITI Aayog Member (Science) Dr V.K. Saraswat released the Guidelines for Utilization of Steel Slag in Road Construction [5].
• The model links Ministry of Steel funding, CSIR research and private steel plants — showing waste reuse needs codes and testing protocols, not goodwill alone [6].

Waste-to-wealth thus converts an environmental liability into durable public assets at lower cost. Its promise now rests on diffusion — training State PWDs, embedding slag specifications in tender documents, and replicating the model for fly ash and construction debris — so that circularity becomes the default of India's infrastructure, advancing SDG-9 and SDG-12 together.