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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Epsilon Carbon Pvt. Ltd. has announced the appointment of Munish Kumar Rathi as its new President and Business Head for Carbon Black.

With more than 25 years of extensive global leadership experience, Rathi brings a strong background in profit and loss management, multi-site manufacturing leadership, strategic planning and business transformation. His career is marked by a demonstrated ability to drive operational excellence and foster sustainable growth across various international markets.

The company is anticipating that his leadership will play a key role as Epsilon Carbon continues to expand its global footprint and accelerate innovation within the carbon black business segment. The organisation has formally welcomed Rathi to the team, expressing confidence in his capacity to guide future strategic initiatives. This move underscores Epsilon Carbon’s commitment to strengthening its leadership team in pursuit of long-term global competitiveness.

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TVS Srichakra has approved capital investment of up to INR 2.2 billion to expand production capacity at its manufacturing facilities in Vellaripatti, Madurai.

The expansion will cover the company’s two-wheeler tyre and off-highway tyre plants, with investment of up to INR 1.1 billion allocated to each facility.

TVS Srichakra said the two-wheeler tyre plant currently has capacity of about 21 million to 23.5  million tyres a year and operates at utilisation levels of around 80 to 85 percent. The company plans to add about 5 percent capacity, with completion targeted in the first half of FY2028-29.

The off-highway tyre plant has existing capacity of about 75 to 85 metric tonnes a year and operates at utilisation levels of 75 to 80 percent. TVS Srichakra plans to increase capacity at the plant by about 25 percent, with the addition scheduled for the first half of FY2027-28.

The company said the investment would be financed through a combination of internal accruals and debt.

TVS Srichakra said the expansion is intended to meet growing demand for its two- and three-wheeler tyres and off-highway tyre products.

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JK Tyre & Industries reported record consolidated revenue of INR 163.84 billion for FY26, registering an 11 percent year-on-year increase, supported by strong domestic demand and volume growth across key tyre segments.

The company’s consolidated EBITDA rose 25 percent to INR 20.89 billion, with EBITDA margin improving to 12.8 percent.

Profit before tax increased 46 percent to INR 10.43 billion, while profit after tax climbed 52 percent to INR 8.60 billion during FY26.

For the fourth quarter, consolidated revenue rose 12 percent year-on-year to INR 42.33 billion.

Quarterly EBITDA surged 42 percent to INR 5.46 billion, with margin at 12.9 percent, while Q4 PAT nearly doubled, rising 94 percent to INR 1.99 billion.

Chairman and Managing Director Dr Raghupati Singhania described FY26 as a year of robust performance, highlighting record volumes in both truck and bus radial and passenger car radial categories.

Domestic sales volumes during Q4 grew 21 percent overall. Truck and bus radial replacement volumes increased 53 per cent, while OEM demand in the segment rose 23 percent. Passenger car radial replacement volumes were up 26 percent and OEM demand increased 10 percent.

The company said growth momentum was expected to continue into FY27, supported by new vehicle launches, infrastructure development and sustained replacement demand.

JK Tyre also highlighted strong traction in electric mobility. More than 70 per cent of electric buses operating in India currently run on its tyres, while the company supplies EV tyres to nearly eight two-wheeler OEMs and has secured orders for electric passenger vehicle models including Renault Duster EV, Hyundai Creta EV and Tata Motors’ Nexon and Punch EV variants.

Its Mexico business, operated through JK Tornel, contributed nearly 20 per cent of consolidated revenue and is expected to maintain growth across Mexican, Latin American and US markets.

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The U.S. Tire Manufacturers Association (USTMA) has elected David Cichocki, Managing Director, Americas, and chief sales officer, Americas Consumer, at The Goodyear Tire & Rubber Company, to its board of directors.

“I’m pleased to welcome David to our Board. His extensive experience and expertise across the tire and consumer goods industries will be invaluable as we navigate today’s complex industry,” said Anne Forristall Luke, USTMA president and chief executive. “His proven leadership will strengthen our ability to seize emerging opportunities.”

Cichocki joined Goodyear in early 2026 and is responsible for overseeing the Americas region and leading the company’s Americas Consumer sales business.

He brings more than 30 years of leadership experience across industrial and consumer goods companies to the USTMA board.

Before joining Goodyear, Cichocki served as senior vice-president of US sales at Whirlpool, where he managed a portfolio valued at more than $10bn across retail and direct-to-consumer channels.

He also spent more than 20 years at Kraft Foods and Nabisco in a range of senior leadership roles.

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