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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ZC Rubber has received the Second Prize of China's State Science and Technology Progress Award for a project focused on high-performance tyre technologies and green intelligent manufacturing, developed jointly with Harbin Institute of Technology. The award recognises the project, titled Key Technologies and Green Intelligent Manufacturing of High-Performance Tires.

According to the company, ZC Rubber is the only Chinese tyre manufacturer to receive the State Science and Technology Progress Award at the Second Prize level or above during the past decade. The award is among China's highest state honours for scientific and technological innovation.

The company said the recognition reflects its investment in research and development and its efforts to integrate tyre development with intelligent manufacturing. In 2025, ZC Rubber invested RMB 1.54 billion in research and development, equivalent to 3.43 percent of annual revenue, according to its annual report.

The award recognises technologies that have moved beyond laboratory research into industrial application, linking high-performance tyre development with green and intelligent manufacturing processes.

Central to the company's research strategy are two proprietary technology platforms: the X-Tech System for truck and bus radial tyres and the Phecda Tech System for passenger car radial tyres. The platforms combine compound formulation, tyre structure design, process engineering, simulation, testing and intelligent manufacturing within a single development framework.

Rather than adapting an existing product architecture, the platforms define performance targets according to vehicle application, operating conditions and customer requirements before developing compounds, structures and manufacturing processes. ZC Rubber said this enables it to develop tyres for different duty cycles, climates, road conditions and regional requirements rather than using a standardised design.

Henry Shen, Senior Vice President of ZC Rubber, said: “Our objective is not simply to develop an individual material, tread pattern or manufacturing process. X-Tech and Phecda are complete development systems that connect user requirements with simulation, materials, tire engineering, manufacturing and validation. This award recognizes the direction we have pursued through sustained R&D investment.”

The company has applied the X-Tech and Phecda platforms across products developed for different regions. In Asia, the X-Tech System underpins the X-Elite truck tyre series. In Europe, it is used in the WESTLAKE Gen II commercial tyre range, while the Phecda Tech System supports passenger car tyres including the WESTLAKE ZuperAce Z-007 and GOODRIDE Solmax 1. Technologies from both platforms have also been applied across ARISUN's truck and passenger car tyre ranges in the Americas.

Shen said: “International markets do not have identical requirements. A tire developed for European highway fleets, Southeast Asian transport operations or passenger vehicles in the Americas must respond to different vehicles, roads, climates and customer priorities. Our technology platforms allow us to address those differences through a consistent and systematic development process.”

The company said the award-winning project incorporates green and intelligent manufacturing technologies intended to improve product consistency, production efficiency and energy performance. It added that the X-Tech and Phecda platforms will continue to support original equipment and replacement market product development across its WESTLAKE, GOODRIDE, ARISUN and other brands.

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The Indian Rubber Materials Research Institute (IRMRI) has officially announced the appointment of Professor (Dr) Abhijit Bandyopadhyay as its new Director. This decision marks a significant leadership transition for the institute, as it prepares to welcome a figure with extensive expertise in polymer science and rubber technology.

Professor Bandyopadhyay brings a distinguished academic and technical background to his new position. He currently serves as a full Professor in the Department of Polymer Science and Technology at the University of Calcutta and holds the role of Director, Technical at the South Asia Rubber and Polymers Park in West Bengal. His prior experience includes a tenure as Assistant Professor at the Rubber Technology Centre, IIT Kharagpur, and he has recently been appointed as a Technical Consultant for Rubber products at Berzelius Materials Performance Inc. in the United Kingdom.

Stepping into his new role, the new Director is expected to prioritise research advancement, indigenisation of technologies and sustainable development within the rubber sector. The IRMRI leadership and members have expressed confidence in his visionary guidance, anticipating that his leadership will drive the institute toward greater innovation and research excellence in the coming years.

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The Bureau of Indian Standards (BIS) has granted laboratory recognition to M/s D. Banerjee Centre of Excellence (DBCOE), based at the JSS Technical Institutions Campus in Mysuru, Karnataka, for a three-year period from 8 July 2026 to 7 July 2029.

The recognition, issued under the BIS Laboratory Recognition Scheme (LRS), enables the centre to undertake testing activities in accordance with BIS requirements. The laboratory's details have been uploaded to the BIS Laboratory Information Management System (LIMS), with sample receipt, testing and report generation to be managed through the online platform. The recognition remains subject to compliance with the provisions of the BIS LRS 2020.

Established by the Indian Institute of Rubber (IRI) in collaboration with JSS Technical Institutions, the centre is intended to strengthen industry-academia collaboration in polymer science and rubber technology while supporting research, testing, training and technology development for the tyre and wider rubber industry.

The facility has developed capabilities in material characterisation, wet chemistry and forensic failure analysis. Its laboratories can analyse raw materials including carbon black, rubber chemicals, elastomers, accelerators and antioxidants, while also supporting material specification development, plant audits and quality approvals. Plans are also in place to expand failure analysis services for manufacturers, particularly small and medium-sized enterprises (MSMEs).

DBCOE also aims to support manufacturers adapting to changing automotive requirements, including electric vehicles, through research into advanced materials and sustainable alternatives. Its stated focus includes bio-based materials, tyre recycling, steel reuse and low-emission polymers, alongside technical support for regulatory compliance and homologation.

Alongside its testing infrastructure, the centre has established a training ecosystem for the rubber sector. It offers two flagship programmes: a Diploma in Rubber Technology for diploma holders and new recruits, and a Postgraduate Diploma in Rubber Technology for science and engineering graduates. Both programmes combine online theory modules with practical training and laboratory sessions at the Mysuru campus, with final examinations conducted by IIT Kharagpur.

The centre is also developing a series of short-duration industry courses covering mixing, compounding, extrusion, calendering, tyre building, moulding, retreading, footwear, conveyor belts and latex products. These programmes combine classroom instruction with practical demonstrations, testing methodologies and failure analysis.

According to the centre, more than 40 industry experts contribute to its training programmes. Several tyre manufacturers, including Apollo Tyres, Yokohama, BKT and JK Tyre, recognise completion of the diploma programme as part of their employee development initiatives.

The centre primarily serves the tyre industry but also aims to support non-tyre rubber manufacturers, particularly MSMEs that lack access to advanced testing facilities and technical expertise. Through consultancy, training and laboratory services, it seeks to improve technical capability, product quality and compliance across the broader rubber sector.

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Elkem ASA, a global leader in advanced silicon-based materials, has announced the appointment of Dag Teigland as its new Chief Executive Officer, effective 3 August 2026. The board’s decision coincides with the departure of Helge Aasen, who will step down after leading the company since 2009 to take on the role of Chairman of the Board.

Bringing more than two decades of industrial and investment expertise, Teigland currently serves as executive chairman of Tekna Holding ASA, a firm known for advanced metal powders. His career includes senior executive positions at Tinfos AS and Holta Invest AS, where he managed an active investment platform. Previously, he held multiple leadership roles at Elkem from 1998 to 2002, culminating as Managing Director for the chrome business area, providing him with direct familiarity with the company’s operations.

Marianne E Johnsen, Interim Chair of the Board of Elkem, said, “The Board is pleased to appoint Dag Teigland as CEO of Elkem. He brings deep industrial expertise and a proven track record of driving development and transformation. With his background spanning both international industrial operations and investment environments, Dag is well suited to lead Elkem into its next phase of growth and development.

“At the same time, the Board would like to thank Helge Aasen for his strong leadership and significant contribution to Elkem over many years. During his tenure, Elkem has strengthened its strategic position, expanded its global footprint and developed world-leading positions in silicon, ferrosilicon, foundry alloys and carbon solutions. Helge has also led Elkem through major portfolio and financing measures, including the divestment of the Silicones division. We are very pleased that he will continue to contribute to the company’s development as chairperson of the board.”

Teigland said, “It is a great honour to return to Elkem and take on the role of chief executive officer. Elkem is a company with a strong industrial heritage and a leading position within its respective segments. I look forward to working with the Board, the Elkem leadership team and colleagues worldwide to build on this foundation, accelerate sustainable growth, advance safety and innovation and ensure that Elkem continues to supply the strategic materials needed for a cleaner, smarter and more resilient future.”

Aasen said, “It has been a privilege to lead Elkem as CEO over the past 17 years. I am proud of what the organisation has accomplished during this period and confident that the company is well positioned for long-term, sustainable value creation. I look forward to continuing to support Elkem in my new role as chairperson of the board and to work closely with Dag in the transition.”

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