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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MAXAM Tire has named Chris Rhoades as its new Zone Sales Director for the Northern region, a move that underscores the company’s dedication to expanding its footprint and enhancing customer service within the speciality tyre aftermarket. The appointment reflects a broader strategy to strengthen leadership and competitive positioning in the sector.

Rhoades brings over 25 years of international industry experience and a well-established reputation as a leading voice in the tyre business. His leadership credentials include being elected to two separate terms on the Tire Industry Association Board of Directors. Most recently at BKT Tires, he managed strategic growth in complex and highly technical off the road markets, where he aligned regional execution with global strategy, led cross functional teams and consistently delivered measurable revenue increases.

In his new capacity, Rhoades will direct all sales operations across the Northern region, collaborating closely with customers and partners to ensure performance, service and support remain synonymous with the MAXAM Tire brand. His appointment signals a focused effort to drive results through experienced leadership and deep market knowledge.

Jimmy McDonnell, Vice President – Sales and Marketing, MAXAM Tire, said, “We are excited to welcome Chris to the MAXAM team. Chris brings deep industry knowledge, proven leadership and a strong customer-first mindset that will create immediate value for our partners. His experience and vision will play an important role as we continue to grow our presence, strengthen relationships and expend the MAXAM brand across the market.”

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Bekaert’s Board of Directors has announced the appointment of Olivier Biebuyck as the company’s next Chief Executive Officer, effective 1 June 2026. He brings extensive expertise in leading, expanding and transforming global industrial enterprises through both organic growth and acquisitions, positioning him to drive Bekaert’s future strategic goals.

On that same date, the board will co-opt Biebuyck as a director. Meanwhile, current CEO and board member Yves Kerstens will conclude his mandate on 31 May 2026, having led the company in recent years. He will also step down from his directorship as of that day.

The leadership transition marks a carefully planned succession, with Biebuyck’s track record seen as critical to advancing Bekaert’s long-term ambitions. The changes take effect at the end of May and start of June 2026.

Jürgen Tinggren, Chairman of the Board of Directors, said, “I am proud to announce the appointment of Olivier Biebuyck as CEO of Bekaert. The Board is convinced that he is the right person to lead the transformation of the company in its next chapter. On behalf of the Board and the entire Bekaert team, I would like to express our sincere appreciation to Yves for his leadership, commitment and contribution to the company over the past years, and wish him the very best.”

Biebuyck said, “Bekaert has an impressive history of innovation, business expansion and evolution. I am honoured to take up the role of CEO at Bekaert. I look forward to working closely with the Board, the leadership team and all colleagues around the world to further transform and grow the company and create long term value for all our stakeholders.”

Kerstens said, “It has been a privilege to serve as CEO of Bekaert and to work alongside our colleagues around the world during the past years. I am proud of what we have achieved together and wish Olivier all the best to lead the company in building a strong future.”

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Sri Lanka-based GRI Tires has extended its limited warranty coverage for pneumatic tyres to up to 10 years, effective from 2026, as the specialty tyre manufacturer seeks to strengthen customer assurance across its agricultural, construction and material handling businesses.

The revised warranty policy applies to all GRI-branded pneumatic tyres manufactured on or after January 1, 2025, and covers customers in more than 80 countries. The company previously offered warranty coverage of up to seven years.

Under the updated policy, agricultural radial tyres will be covered for up to 10 years, while agricultural bias tyres will receive coverage of up to eight years. Construction, earthmover, industrial, material handling, port and mining tyres will be covered for up to five years, subject to terms and conditions.

GRI said warranty protection would cover qualifying defects, with credit issued on a pro-rated basis.

For qualifying failures occurring within the first three years, and where radial tyre wear does not exceed 20 per cent, customers will receive a full replacement credit.

The warranty applies exclusively to the original end-use purchaser.

“This enhanced 10-year warranty is more than a policy update — it is a statement of our conviction in the quality of every tire we manufacture,” said Barry Guildford, global commercial director at GRI.

“We build tires to perform in the most demanding conditions, and we stand behind them.”

Customers can submit warranty claims through authorised GRI dealers and distributors, or directly through the company’s customer support channels.

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Georg Nordmann Holding Aktiengesellschaft (GNH) has appointed Martin Rathke as Managing Director of its subsidiary Nordmann (Nordmann, Rassmann GmbH), effective 1 May 2026. The move marks a strategic step in the company’s ongoing leadership development.

Rathke joins with considerable leadership experience and deep knowledge of international sales and distribution within the chemical distribution sector. His career includes years of service in a family-owned enterprise, where he held senior management roles with global responsibility. He will now share leadership duties with Ulrich Cramer, who remains in his position, and together they aim to form a closely aligned team to advance Nordmann’s strategic direction.

The joint leadership will focus on accelerating global expansion through targeted strategic, organic and inorganic growth while optimising existing operations and continuously refining the company’s portfolio strategy. Backed by the commitment of its shareholders, Nordmann seeks to strengthen its international presence and evolve into a global player in the chemical distribution industry.

Irina Zschaler, CEO of Georg Nordmann Holding Aktiengesellschaft, said, “Martin brings exactly the combination of entrepreneurial mindset, international experience and leadership strength that we value in our relationships and for our path to grow. Our collaboration is based on responsibility, integrity and the aspiration to create added value together for all involved and the entire group. We are therefore very much looking forward to welcoming our full Nordmann team.”

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