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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Marking its 55th anniversary in 2026, Tana Oy is celebrating a legacy defined by the seamless integration of human expertise and advanced technology. For more than five decades, this commitment has driven the company’s evolution in the recycling and waste management sector. Tana has consistently grown in tandem with its customers, engineering robust machines, systems and services capable of withstanding the most demanding real-world conditions. As the industry pivots towards greater efficiency and smarter resource use, this enduring philosophy ensures Tana remains a steadfast partner, poised to deliver uncompromising solutions for future challenges.

A key pillar of Tana’s strategy is the continuous expansion of its global footprint. By strengthening its international presence and local operations, the company positions itself closer to its customers. This approach allows for more integrated support, fosters deeper partnerships and enables the tailoring of solutions to meet specific regional needs, all while upholding the reliability synonymous with a global brand. The strength of this network is evidenced by thousands of machines operating worldwide and longstanding industrial partnerships, milestones that underscore Tana’s reputation as a trusted partner for operational excellence and long-term dependability.

Looking forward, innovation remains central to Tana’s mission, with a focus on solutions shaped by real-world demands. Digital tools like TanaConnect exemplify this, linking machines, data and people to optimise operations and enhance lifecycle management. Simultaneously, the latest generation of recycling machines is designed for high performance and adaptability to evolving material streams. As Tana marks this anniversary, its direction is resolute. Continued investment in its people and technologies, from digital platforms to advanced machinery, ensures it will meet the growing demand for efficient waste-to-value solutions, ready to shape the future with no time to waste.

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Goodyear India Limited reported higher quarterly profit despite recognising INR 1.94 million of past service costs under India’s new labour codes, as revenue declined year on year.

Revenue from operations for the quarter ended 31 December 2025 fell to INR 606.9 million, from INR 631.7 million a year earlier. Total income was INR 611.5 million, compared with INR 636.4 million.

Profit before tax rose to INR 33.4 million, up from INR 13.3 million in the corresponding quarter last year. Net profit increased to INR 24.6m, compared with INR 9.5 million. Earnings per share were INR 10.68, against INR 4.11 a year earlier.

Total expenses declined to INR 578.2 million from INR 623.2 million. Cost of materials consumed fell to INR 221.5 million from INR 257.9 million, while purchases of stock-in-trade were INR 190.3 million, broadly in line with INR 191.1 million a year earlier. Employee benefits expense rose to INR 52.2 million from INR 44.4 million.

For the nine months to December 31 2025, revenue from operations decreased to INR 1,859.6 million from INR 2,005.4 million in the same period last year. Profit before tax rose marginally to INR 69.8 million from INR 67.9 million. Net profit was INR 51.8m, compared with INR 50.3m.

The company said it had recognised past service costs of INR 1.94 million under employee benefits expense in the quarter and nine months ended December 31 2025, following notification of the Code on Wages, 2019, the Industrial Relations Code, 2020, the Code on Social Security, 2020 and the Occupational Safety, Health and Working Conditions Code, 2020.

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Balkrishna Industries (BKT) reported a six percent rise in quarterly volumes and commissioned additional carbon black capacity, even as US tariffs and volatile commodity prices weighed on parts of its export business.

The company’s sales volumes rose to 80,620 metric tonnes in the quarter to December 2025, up six percent year on year and about 15 percent higher than the previous quarter. For the first nine months, volumes were 231,536 metric tonnes, down onepercent from a year earlier.

Standalone revenue for the quarter was INR 26.82 billion, up 4 per cent year on year, including a realised foreign exchange loss of Rs 470 million relating to sales. For the nine months, revenue was Rs 77.62 billion, broadly flat, including a realised forex loss of Rs 1.17 billion.

Earnings before interest, tax, depreciation and amortisation were Rs 6.05 billion for the quarter, with a margin of 22.5 percent. For the nine months, EBITDA was INR 17.6 billion, down 11 percent year on year, with a margin of 22.7 percent. Profit after tax for the quarter was INR 3.75 billion, and INR 9.27 billion for the nine-month period.

Rajiv Poddar, Joint Managing Director of BKT, said the “geopolitical and macroeconomic environment continues to remain challenged and the situation with U.S. tariffs remain unchanged”.

In the US, sales momentum improved sequentially after a weak second quarter. Poddar said the group had regained some momentum by sharing the tariff burden with distributors. “Because of our strong brand positioning and quality and some major chunk of the tariffs to be shared between us and our channel partners, we have been able to gain some of the momentum that we had lost in the Q2,” he said.

He declined to quantify the impact of tariffs on margins, but confirmed that costs were being shared. Channel inventory in the US and Europe was “at par at where it should be”.

India remained the strongest market, supported by lower goods and services tax rates and favourable monsoon conditions. The domestic portfolio is split roughly 60 percent industrial and construction tyres and 40 percent agricultural tyres. Higher India contribution has a “slightly lower” average selling price, Poddar said, but margins have remained broadly stable.

In Europe, demand improved sequentially as earlier destocking eased. The European Union Deforestation Regulation, originally due to take effect from January 2026, has been deferred by one year. Madhusudan Bajaj, Senior President and Chief Financial Officer, said the current import duty into Europe is four percent, though the impact of the proposed free trade agreement with the EU is not yet clear.

Freight costs were about 5 percent of revenue in the quarter and are expected to remain in that range.

On raw materials, Bajaj said oil and natural rubber prices were moving higher, but it was “too early to say what will be the impact”. The average euro rate in the quarter was about INR 97.

Capital expenditure remains elevated. The company has spent about INR 22 billion in the first nine months of the financial year and expects total spending of roughly INR 25–26 billion in FY2026, with the balance of committed projects to be completed in the following year.

During the quarter, BKT commissioned a new carbon black line, taking total capacity to 265,000 metric tonnes per annum. The incremental capacity is intended for external sales rather than captive consumption. Carbon black accounted for less than 10 percent of revenue in the quarter, with margins expected to align with industry averages.

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ZAFCO, a leading global manufacturer and distributor of automotive tyres, batteries and lubricants, has strengthened its corporate governance with the addition of Hee Se Ahn to its Board as an Independent Director, effective 1 January 2026. Bringing over three decades of specialised industry experience, Ahn is recognised for his extensive leadership in the global tyre sector.

His professional background is deeply rooted in international commerce, with significant achievements in overseas sales, strategic marketing and high-level management across key markets in Asia, Europe and the Americas. Prior to this appointment, his career included senior roles such as Executive Vice President at Nexen Tire and Managing Director at Hankook Tire, based in Seoul. Throughout his career, he has been instrumental in fostering international expansion and enhancing market positions while leading diverse, cross-regional teams, solidifying his status as a respected figure in the industry.

Zafar Hussain, Executive Director, ZAFCO Group, said, “We are pleased to welcome Hee Se Ahn to the Board of ZAFCO. His extensive international experience in sales, marketing and regional leadership will bring valuable perspectives to the company. His deep understanding of the global tyre industry will be a strong asset to both the Board and the management team.”

Amir Abbas, Executive Director, ZAFCO Group, said, “We are delighted to welcome Hee Se Ahn to the ZAFCO Board. He brings with him a global business mindset and rich insights into leadership and international business transformation. We look forward to his contributions as we continue to strengthen our global presence.”

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