As the world grapples with the environmental challenges of discarded tyres, IIT Bombay researchers are developing sustainable solutions by repurposing waste rubber into innovative construction materials. Nilesh Wadhwa reports on how their work not only aims to mitigate landfill waste but also offers unique thermal, electrical and structural benefits for future infrastructure.

With over a billion tyres discarded globally each year, the world faces an escalating crisis in managing tyre waste. Beyond the mounds of rubber in landfills, the environmental and health hazards from tyre degradation, microplastics and toxic emissions are profound. However, a team of researchers at the Indian Institute of Technology (IIT) Bombay is charting a sustainable path forward. By transforming waste tyres into innovative construction materials – Rubcrete, which is a form of concrete mixed with shredded waste tyres. This is said to not only provide strength to the material but also make it more environmentally friendly. The idea is to turn an environmental problem into a valuable resource for civil engineering.

In an interaction with Tyre Trends, Prithvendra Singh, a principal researcher at IIT Bombay, explained the motivations behind this ground-breaking research. “The main aim of this research was to address the dual challenge of excessive end-of-life tyre (ELT) accumulation and the unsustainable depletion of natural aggregates due to ever-rising demand in infrastructural development,” he stated.

By converting waste rubber into engineered rubber aggregates (RA) and rubber-plastic blends (RPB), the team seeks to not only reduce landfill dependency but also enhance the sustainability of construction materials.

This pioneering approach is timely. The sheer scale of tyre waste, with millions of tonnes generated annually, has far-reaching consequences. Tyres are durable, non-biodegradable and pose serious fire hazards.

“One of the most overlooked issues is the generation of microplastics and toxic volatile compounds through tyre wear and tear, degradation, weathering or fires. Landfilled rubber fires can take months to extinguish and result in the emission of carcinogenic gases. These pose risks to human health and ecosystems, and their long-term contamination potential – especially via water, soil and air – is often overlooked in conventional waste management frameworks,” emphasised Singh.

FROM LAB TO FIELD

The IIT Bombay team’s research has revealed promising properties in both RA and RPB, which could revolutionise the use of secondary materials in civil engineering.

Singh elaborated on the mechanical characteristics, “RA and RPB exhibit significantly lower stiffness and higher deformability than natural aggregates, which makes them suitable for specific geoenvironmental applications but limits their use under high structural loads.”

While these properties may exclude them from load-bearing infrastructure, they open up opportunities in other areas. “Despite their lower mechanical strength, both materials demonstrate promising insulation characteristics and environmental safety under controlled conditions,” Singh added.

Thermal and electrical insulation capabilities are where these materials truly shine. “Both RA and RPB have superior thermal resistivity compared to standard sand, confirming their suitability for thermal insulation. Electrically, dry RPB shows the lowest conductivity, making it highly suitable for electrical insulation applications. Both materials also act as excellent dielectric materials over a broad frequency range,” Singh explained.

These characteristics make them ideal for construction projects where insulation and resistance to extreme temperatures or electrical fields are critical, such as in utility corridors or specialised building applications.

However, the journey from laboratory research to real-world applications is not without its challenges. “The lower stiffness of RA leads to higher vertical deformation under applied loads, making them less suitable for high-load applications such as base layers of highways,” Singh pointed out.

“However, they are ideal for lightweight fill applications like embankments or drainage layers, where flexibility and energy absorption are more beneficial than stiffness,” he added.

This insight highlights the potential for using RA and RPB in applications where traditional materials fall short, such as in earthquake-prone regions or on unstable soils where flexibility can mitigate damage. The process of creating RA and RPB depends heavily on the methods used to shred and process waste tyres.

SHREDDING METHODS: BALANCING COSTS AND PERFORMANCE

Singh outlined the pros and cons of various shredding technologies. “Ambient shredding is cost-effective but produces rough-surfaced particles, which exhibit better interaction in cement and polymer composites,” he noted. “Cryogenic shredding yields smoother particles with a broader size distribution but poorer bonding characteristics, and the created particles are generally suitable for turf or sports surfaces. Water-jet grinding offers finer control over particle size but comes at high energy and equipment costs.”

Each method results in materials with distinct properties, influencing their performance in construction applications.

Real-world validation is a crucial step in advancing this technology. To this end, IIT Bombay has partnered with GRP India, a leader in rubber recycling.

“We are currently collaborating with GRP to venture into production and field applications of these sustainable aggregates,” Singh revealed. “This partnership provides a foundation for scaling up through industrial-grade shredding, blending and real-world performance validation.”

These collaborations not only bring academic research closer to commercial implementation but also offer a model for future partnerships between academia and industry.

Of course, environmental safety remains a central concern in adopting new construction materials, especially those derived from waste. Leaching of metals and organic contaminants can pose long-term risks if not properly managed.

Singh’s team addressed these concerns through rigorous testing. “ICP-AES analysis showed that heavy metals like Pb and Zn are present in low concentrations, well within permissible limits,” he reported. “Previous studies corroborate that such materials typically stay within permissible toxicity limits under standard conditions. However, long-term leaching behaviour under varied field conditions remains necessary to confirm safety under varying environmental exposures.” This underscores the need for comprehensive testing and monitoring to ensure environmental safety.

THE ROAD AHEAD

Looking forward, IIT Bombay’s research agenda is ambitious. Singh described plans for further experimentation to expand the applications of RA and RPB. “We are currently planning long-term loading-unloading experiments and elevated temperature testing to establish the thermo-mechanical response of RA and RPB under realistic field stresses,” he said. “These experiments aim to address limitations in durability data and expand application potential. Also, future experiments will simulate realistic landfill environments, including interactions with leachate, microbes, humidity and temperature, to understand long-term behaviour.” Such studies will be essential for certifying these materials for broader use in civil engineering.

Could tyre-derived materials eventually replace traditional aggregates in certain applications? Singh is optimistic. “Yes, particularly in non-structural or semi-structural applications such as leachate drainage layers, landfill covers, thermal insulation barriers and lightweight embankments. The lightweight, high porosity and insulation capabilities of the RA and RPB present unique advantages that traditional aggregates cannot provide,” he said.

This vision aligns with global efforts to promote circular economies and reduce reliance on finite natural resources.

Responding to his expectations from the industry, Singh stated that stakeholders need to support the integration of sustainable materials into mainstream construction.

“The message I would like to convey to the academicians, tyre industry stakeholders and policymakers is to embrace innovation through cross-sectoral collaboration. Sustainable solutions like RA and RPB not only offer environmental remediation but also open new markets for green construction materials. With the right policy incentives, certification frameworks and industry support, we can mainstream these materials and accelerate the transition towards a circular, resilient economy,” he said.

IIT Bombay’s work exemplifies how innovative research, when coupled with industry collaboration and policy support, can turn a pressing environmental problem into a sustainable solution. By reimagining waste as a resource, Singh and his team aim to not only address the tyre waste crisis but also lay the groundwork for more resilient and eco-friendly infrastructure in the future.

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Gaurav Kumar has resigned as a whole-time director of Apollo Tyres, the Indian tyre manufacturer, after more than two decades with the company, though he will remain chief financial officer during a transition period.

The Gurugram-based company's board approved the resignation at a meeting on Thursday. Kumar steps down as a director, and consequently as a member of the risk management committee, with effect from the close of business the same day. The company said he had confirmed there was no material reason for his departure beyond that stated in his resignation letter.

Kumar will continue as chief financial officer for such period as is necessary to ensure a smooth transition, after which he will cease to be part of the company's senior management.

In his resignation letter, Kumar said: "It has been terrific to be part of the incredible journey at Apollo Tyres thus far. I have learned, and hopefully contributed in equal measure, and now seek to explore alternative and new challenges. I wish Apollo Tyres the very best for the journey ahead and will always be part of the Apollo Tyres Family." He added that he was grateful to Onkar Kanwar and Neeraj Kanwar for their support during his tenure of more than 22 years at the company.

Neeraj Kanwar, Vice-Chairman and Managing Director, said: "Gaurav deserves kudos for the critical role he has played in the growth of Apollo Tyres, both in India and overseas, in the last twenty years. While we do regret losing him, we are conscious of his personal aspirations and wish him the very best in his future endeavours."

The company said it was in the process of appointing a new chief financial officer.

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Shrader Tire & Oil (STO) has announced the appointment of Bob Feldbauer to the role of President, effective 1 August 2026. He will concurrently serve as Chief Operating Officer, while Joe Shrader maintains his position as Chief Executive Officer.

Feldbauer’s ascent follows his arrival at STO in early 2025 as Chief Operating Officer, a role built upon a robust industry resume. His prior engagements include a lengthy stint at the helm of Jack’s Tire & Oil in Utah and a substantial period with Michelin North America, where he handled sales and managerial assignments.

Under the new structure, Feldbauer’s purview widens to encompass both internal fleet management across 14 sites and outward-facing commercial development, including alliances and market expansion. With the founding family’s fourth generation now active within the firm, the succession plan reinforces the enduring principles established when the company opened in 1948.

Shrader said, “Bob has proven exactly what we hoped he would when we brought him on board – sharp operational instincts and a real drive to help this company grow. Putting him in the President seat lets us move faster on the growth plans we’ve been building towards.”

Feldbauer said, “It has been a fast year and a half at Shrader Tire & Oil. I have gained tremendous insight and valuable knowledge about our organisation’s structure, company culture and an understanding of our overall goals and commitments. One thing is clearly obvious – the commitment Shrader employees have to deliver the best customer experience each and every time. I appreciate this and look forward to supporting them as their President and COO.”

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Balkrishna Industries Ltd. (BKT) has unveiled a brand installation at the Mumbai International Airport Limited (MIAL) T2 Elevated Road Underpass as the tyre manufacturer seeks to broaden its positioning beyond its traditional Off-Highway business and strengthen awareness of its expanding on-highway portfolio in India.

The 2,000 sq. ft. installation, inspired by the company's "Elevate Your Drive" philosophy, highlights BKT's portfolio across agriculture, construction, mining, earthmoving, commercial vehicles, two-wheelers and passenger vehicles. The activation comes as the company expands its presence in India's two-wheeler and commercial vehicle tyre segments.

Designed to move beyond conventional outdoor advertising, the installation features nine illuminated tyre-shaped displays, each 8 feet in diameter, using the tyre itself as the central storytelling element. It opens with a large-format visual featuring BKT brand ambassador Ranveer Singh, followed by a sequence of displays illustrating the company's expanding mobility portfolio. The installation will remain at the airport for 24 months.

Mumbai International Airport handled a record 55.5 million passengers in 2025, providing the company with sustained visibility among business travellers and consumers.

"For BKT, innovation goes beyond product engineering; it extends to how we tell our story. This installation reflects a simple yet powerful idea: our tyre itself becomes the medium through which travellers experience the breadth of BKT's world. As we expand our presence across India's mobility landscape, it is important that consumers see BKT not through a single product category, but as a brand that supports movement across diverse terrains, applications and journeys. Mumbai Airport provides an ideal stage for us to express that transformation in a memorable and distinctive way," said Satish Sharma, Senior President & Director – Business Development and Strategy, BKT.

The installation was conceptualised by Infectious Advertising and uses immersive design, sequential storytelling and its airport location to showcase the company's wider mobility portfolio. According to BKT, the activation is intended to connect its established Off-Highway business with its growing presence in India's on-highway mobility market.

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Mumbai-headquartered leading carbon black manufacturer Epsilon Carbon has reported a 10 percent reduction in carbon dioxide equivalent emissions across its upstream transportation operations during FY2025–26. The reduction was achieved through the deployment of an electric and liquefied natural gas freight fleet.

An independent third party certified the emissions data. The reductions achieved in transport logistics equate to carbon absorption figures associated with approximately 29,000 trees. The verified figures allow supply chain partners to include these reductions within Scope 3 emissions reporting frameworks and environmental disclosures.

Gaurav Mathur, Chief Executive Officer, Epsilon Carbon, said, “Decarbonising logistics is central to our climate strategy. What makes this milestone meaningful is that the results are independently verified with a 10 percent reduction in CO2e emissions within the upstream transportation category over a single financial year, driven by the adoption of electric and LNG fleets. These carbon reductions strengthen our own sustainability disclosures and those of our customers, and we intend to scale this model across our supply chain.”

Following Phase 1 operations, Epsilon Carbon intends to expand the number of electric and LNG vehicles in its transport fleet during FY 2026–27 to scale low-carbon freight transport across its supply chain network.

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