Economy & Market
The Refractory Advantage
Published
7 months agoon
By
admin
From AFR-driven chemistry shifts to digitalised kiln monitoring, refractory strategy has become central to operational stability and cost control. Plants that treat refractories as strategic assets and not consumables are redefining efficiency in the modern cement industry. ICR delves into the innovations in refractories and their repercussions on pyroprocessing efficiency in India’s cement industry.
Refractories form the quiet backbone of cement pyroprocessing—absorbing thermal shocks, resisting corrosive chemical attacks, and maintaining process continuity in the most extreme conditions of the plant.
While kiln drives, heat exchangers and burners often dominate conversations, the refractory lining allows a kiln to operate at 1,400–1,500°C daily without structural damage. According to the World Refractories Association, the cement sector accounts for nearly 30 per cent of refractory demand in construction materials industries, driven by the need for monolithic castables, high-alumina bricks and magnesia-based linings. Meanwhile, a report by the Indian Minerals Yearbook states that India is among the top refractory-consuming markets in Asia, driven by capacity expansions, debottlenecking and higher AFR substitution in integrated plants.
What makes refractories strategically important is their direct influence on clinker cost, fuel consumption and kiln efficiency. According to the Bureau of Energy Efficiency (BEE), thermal energy consumption in Indian cement plants ranges from 650–800 kcal/kg of clinker, depending on fuel mix, pyroprocessing stability and technology. Even minor refractory wear triggers cascading inefficiencies. A report by FLSmidth states that coating instability in the burning zone can increase energy use by 3 per cent to 7 per cent, raise free-lime variability and reduce kiln output by up to 10 per cent. These disruptions travel downstream—overloading coolers, damaging clinker granulometry, and affecting grinding systems. Refractory performance is not maintenance—it is margin protection.
Pyroprocessing, however, is evolving faster than ever. High AFR rates, aggressive calciner chemistry and stricter NOx/SOx limits have made “temperature-only” refractory selection obsolete. Modern plants demand linings resilient to thermal cycling, alkali infiltration, and abrasion. They also demand digital eyes inside the kiln, and installation methodologies that compress shutdown windows without compromising life. As India moves toward Net Zero, refractories and pyroprocessing systems are no longer supporting actors—they are the backbone of sustainability and competitiveness.
Kiln lining fundamentals
The rotary kiln remains the thermal heart of every cement plant. It is an environment where temperatures exceed 1,400°C and stresses are constant. The refractory lining is the sole shield between this world and a shell that must remain below 350–400°C to avoid structural failure. According to the World Refractories Association, refractories inside kilns endure 1,200–1,700°C, as well as chemical infiltration from sulphur, alkalis and volatile metals. Each zone brings unique threats: calcining zones see dust impingement, burning zones face clinker abrasion, and coolers battle high mechanical shock. Refractory selection must therefore be a zone-specific exercise balancing heat, chemistry and wear.
Material science underpins this design. A report by RHI Magnesita states that magnesia-spinel and magnesia-hercynite bricks deliver 15 per cent to 25 per cent higher resistance to clinker infiltration than traditional magnesia-chrome options, making them suitable where coating is unstable. According to the Indian Minerals Yearbook, high-alumina bricks, when paired with low-cement castables in transition zones, reduce spalling risk and extend lining life by 20 per cent to 30 per cent. Preheaters and coolers, meanwhile, respond better to abrasion-resistant alumina castables and silicon carbide. Effective refractory design maps these environments to the correct materials, ensuring kiln uptime and stable clinker output.
Beyond chemistry, three disciplines drive lining longevity: thermal elasticity, coating compatibility and installation. A lining that tolerates expansion without cracking, supports protective coating formation and is installed with proper anchoring will outperform a superior material installed badly. Treating refractory installation as a routine shutdown task invites wear, hotspots and premature relining. Modern refractories must work with the process, not merely endure it.
Preheater, calciner and cooler zones: unique refractory demands
Preheaters and calciners are the most aggressive wear environments in pyroprocessing. Fast gas velocities, thermal cycling and volatile chemistry punish linings relentlessly. According to the Portland Cement Association, gas velocities in preheater risers reach 18–22 m/s, with particle loading of 30–40 g/m3, creating intense erosion. Unlike kilns, preheaters rarely develop stable coating layers, making abrasion and thermal shock resistance more critical than temperature tolerance. Calciners intensify chemical stress: AFR combustion, sulphur oxidation and alkali vapours penetrate refractories, demanding low-porosity, chemically stable materials.
Material strategy in these areas differs. Silicon carbide, abrasion-resistant alumina and low-cement castables dominate because they survive dust, vibration and thermal cycling. A report by FLSmidth states that incorrect refractory choice in preheaters can increase pressure drop by 8 per cent to 12 per cent, raise exit temperatures and compromise calcination efficiency—pushing fuel load downstream. According to RHI Magnesita, refractory wear spikes sharply when SO3 in fuels exceeds 1.5 per cent, accelerating alkali-sulphate attack. Refractory strength alone is insufficient—it must align with the gas phase and fuel blend.
The clinker cooler poses a different battle: mechanical shock and direct impact. Abrasive clinker chunks repeatedly strike the lining, often destroying material faster than heat ever could. Abrasion-resistant castables, modular precast blocks or armour tiles are essential to maintain heat recovery and minimise downtime. Plants that treat these zones as extensions of the kiln overlook their unique physics—and pay for it in energy and throughput.
AFR revolution: How changing fuels reshape refractory strategy
Alternative fuels—biomass, RDF, rubber, industrial waste—have transformed kiln chemistry. According to the Global Cement and Concrete Association (GCCA), AFR usage has increased over 60 per cent in the last decade, with European plants reaching 60 per cent to 80 per cent thermal substitution versus 15 per cent to 20 per cent in emerging economies. AFR adoption improves emissions and cost profiles, but destabilises coating, introduces salt vapours and shifts heat profiles—each of which impacts refractory life.
Naveen Kumar Sharma, AVP – Sales and Marketing, Toshniwal Industries, says, “Our solutions are built around four core parameters: energy efficiency, yield loss reduction, product quality and environmental responsibility. These pillars drive our engineering decisions and define how our technologies support cement plants, especially as they adopt alternative fuels and raw materials (AFR). We strongly believe in energy conservation. Every product we offer—whether for thermal monitoring, kiln control or flame optimisation—is engineered to improve energy performance. Reducing yield loss is another principle deeply embedded in our solutions, because production interruptions and material losses directly affect plant profitability and clinker quality. We are also highly conscious of the end-product quality delivered by our customers to their markets. Consistency in burning, heat transfer, and thermal profiling directly influences clinker characteristics, and our instruments help maintain this stability. By optimising flame patterns, energy use, and pollution, our solutions deliver direct and indirect savings. Plants benefit from lower operational losses, reduced maintenance, and improved reliability, especially in pyroprocessing zones.”
Alkalis, chlorine and metals volatilise in hot zones and condense in cooler areas, infiltrating refractory pores. A report by the European Cement Research Academy (ECRA) states that chlorides from plastic-rich fuels reduce lining life by 30 per cent to 50 per cent in burning and preheater zones. According to the International Energy Agency (IEA), high AFR increases NOx/SOx and alkali-sulphate circulation, forcing plants to use higher-grade refractories. VDZ Germany research shows AFR kilns experience more coating instability, accelerating fatigue.
AFR requires moving from “high-temperature resistance” to “high-chemistry tolerance.” Magnesia-spinel and hercynite bricks help resist vapours; abrasion-resistant monolithics handle calciner dust. Plants that swap fuels without revising refractory strategy see premature failure. AFR is not a fuel choice—it is a process redesign requiring burner tuning, sulphur balancing and digital monitoring.
Failure modes and root causes
Refractory failure is rarely material—it is process. Alkali cycles deposit potassium and sodium deep into refractory pores, forming expansion phases. According to the European Cement Research Academy (ECRA), alkali-silica reactions reduce brick strength by up to 40 per cent. Combined with SO3 fuels, alkalis destabilise coating, induce spalling and trigger hotspots. Carbon monoxide damage is subtler. A report by the World Refractories Association states that 500–1,000 ppm CO exposure weakens refractory bonding, causing micro-cracks.
Sunil Kumar Gupta, Chief Project Officer, Star Cement, says, “Thermal profiling and digital monitoring have become essential predictive-maintenance tools for managing kiln and preheater performance. Online shell scanners now provide continuous thermography from inlet to outlet, helping teams assess coating behaviour and refractory health. Drone-based thermography is gaining popularity because it captures hotspots in areas manual checks cannot reach, especially inside cyclones and the calciner during shutdowns. Alongside kiln and cooler cameras, emerging instruments such as cooler-bed thickness sensors further optimise operation. Together, these technologies deliver better KPIs, more stable coating and improved refractory life. Digital data ensures that refractory life is maximised by maintaining stable thermal conditions.”
Thermal shock is mechanical: sudden temperature drops, often 100–150°C during start/stop, fracture high-modulus materials. According to VDZ Germany, uncontrolled thermal cycling shortens burning-zone lining life by 25 per cent to 35 per cent, even if the material is chemically sound. Plants rarely blame combustion or AFR shifts—they blame the brick. Refractories must be read as diagnostic tools, not just consumables.
Shaped vs monolithic refractories
Shaped bricks dominate burning and transition zones. Their dense microstructure resists abrasion and supports coating. According to the World Refractories Association, shaped refractories provide 10 per cent to 20 per cent higher abrasion resistance than castables above 1,400°C. Their modularity preserves shell geometry under load. A report by VDZ Germany states that brick linings withstand 50–60 coating collapse events annually, while monolithics lose strength under repeated instability. Monolithics excel in dynamic wear zones—cyclones, risers, coolers—where jointless continuity resists dust erosion. According to the European Cement Research Academy (ECRA), low-cement castables reduce cold-face heat loss by 8 per cent to 12 per cent and extend cyclone inlet life by 20 per cent to 30 per cent. Anchoring flexibility and rapid installation make monolithics ideal for modern operations.
Installation discipline and shutdown planning
Refractory success is determined at installation—not purchase. Joint thickness, curvature, anchor layout and heating curves matter more than material brochures. A report by the WBCSD–CSI states that poor installation causes over 50 per cent of global refractory failures. In India, compressed shutdowns amplify these risks. Outages carry direct and indirect cost. According to the International Energy Agency (IEA), unscheduled kiln shutdowns increase plant-wide energy consumption by 3 per cent to 6 per cent for 30 days. Plants that treat shutdowns as cross-functional engineering events—not maintenance—see longer lining life and fewer emergencies. Precision is a performance technology.
Digital monitoring, thermal profiling and predictive maintenance
Thermal cameras, shell scanners and kiln-eye systems have replaced intuition. According to the International Energy Agency (IEA), digital monitoring reduces refractory downtime by 20 per cent to 25 per cent. A report by ECRA shows that continuous temperature profiling predicts coating instability up to 48 hours earlier, enabling proactive intervention.
Professor Procyon Mukherjee explains, “Advanced refractory technologies are moving beyond material selection toward engineered performance systems. Next-generation monolithics and castables—enhanced with improved bonding chemistries, nano-modifiers and reduced alkali reactivity—extend campaign life and significantly reduce patch repair frequency. These materials also shorten shutdown windows because they cure faster and offer more predictable installation characteristics, directly lowering kiln downtime. 3D-printed refractory modules and prefabricated assemblies are now being used for burner blocks, riser ducts and throat geometries, allowing bespoke shapes that are difficult or risky to build onsite. Additive manufacturing enables tighter dimensional tolerances and faster installation in constrained spaces, where precise fitting is critical to avoid stress concentrations or mechanical wear.”
“A step further is the emergence of sensorised and embedded-monitoring refractories. Distributed fibre-optic lines, acoustic-emission sensors and integrated thermocouples provide real-time heat maps and detect micro-fracture initiation long before visual damage appears. These systems support condition-based maintenance instead of calendar-based shutdowns, enabling more informed decisions on when and how to intervene. Hybrid lining systems are also gaining traction—pairing high-performance bricks at the hot face with insulating monolithics behind them to optimise both cost and thermal reliability. Industry trials and publications from 2023–25 show early adoption of these technologies, with predictive analytics and sensor-embedded linings proving especially impactful in reducing unplanned outages and extending refractory life” he adds.
Predictive maintenance is the next frontier. According to ABB Industrial Analytics, AI systems cut unscheduled stoppages by 30 per cent to 50 per cent and extend refractory life. Plants that digitise pyroprocessing gain higher uptime, smoother ramp-ups and safer AFR adoption.
Retrofit pathways for older kiln lines
Older kilns are not obsolete—they are underutilised. According to the International Energy Agency
(IEA), targeted system upgrades improve clinker efficiency by 10 per cent to 15 per cent without new CAPEX. A report by GCCA states that retrofit optimisation reduces fuel by 3 per cent to 6 per cent. Retrofits begin with refractories: replacing chrome bricks, deploying abrasion monolithics, adding shell monitoring.
Their power is modularity. As per VDZ Germany, switching riser bricks to monolithics extends lining life by 20 per cent to 30 per cent and speeds installation by up to 35 per cent. Plants that treat old kilns as living systems—not legacy assets—win.
Towards Net Zero
Net Zero is a kiln stability challenge. GCCA claims that decarbonisation demands lower clinker intensity, higher AFR and efficiency—all refractory-dependent. A report by the IEA states that thermal improvements deliver 16 per cent to 20 per cent of total CO2 reduction, unattainable without coating stability and engineered refractories.
For India, incremental efficiency is everything. Proper refractory selection extends lining cycles by 25 per cent to 35 per cent, lowering shutdown emissions and volatility. Plants that view refractories as strategic assets—not consumables—achieve uptime, kWh/tonne improvement and real Net Zero momentum, according to VDZ Germany.
Conclusion
A new refractory philosophy is emerging in the cement industry—one where materials, process control, digital monitoring and shutdown discipline work together as a single ecosystem. Plants that still treat refractories as a replaceable commodity inevitably fall into cycles of premature wear, coating instability and soaring maintenance cost. But those that integrate material science with pyroprocessing logic—choosing the right brick for the right zone, using abrasion-resistant monolithics where needed, planning installations with precision, and upgrading older lines with smarter systems—are consistently outperforming their peers. In a market defined by tighter margins, unpredictable fuels, and rising sustainability expectations, refractories have become a lever of efficiency, not an afterthought.
The path forward is clear: engineered materials, digitalised diagnostics, predictive maintenance and intelligent retrofit strategies will shape the future of cement pyroprocessing. As AFR substitution grows, kiln loads intensify and environmental standards tighten, refractory solutions will evolve from passive armour to active enablers of reliability and emissions control. The plants that recognise refractories as strategic assets—rather than shutdown consumables—will unlock longer campaigns, lower kWh per tonne, greater clinker consistency and fewer disruptive outages. In that future, the kiln lining is not only a protective layer—it is the foundation on which India’s cement producers will build resilience, competitiveness and meaningful progress toward Net Zero.
– Kanika Mathur
Economy & Market
Fornnax Names Lukas Baur as Authorised Service Partner to Bolster EU Operations
Published
1 day agoon
July 23, 2026By
admin
Strapline: Fornnax Technology has appointed NOBA Maschinenservice’s Lukas Baur as its authorised service partner for the European Union, strengthening its commitment to delivering fast, reliable, and localised after-sales support across the region.
Fornnax Technology, a leading manufacturer of industrial shredding solutions, has announced the appointment of Mr. Lukas Baur of NOBA Maschinenservice as its authorised service partner for the European Union. The partnership, formalised under the authorisation of Fornnax CEO Mr. Jignesh Kundaria, reinforces the company’s commitment to providing dependable, localised service support to its expanding customer base across Europe.
Strengthening Service Through Proven Expertise
With over two decades of experience in servicing, maintaining, and overhauling industrial shredders, Mr. Baur brings extensive technical expertise to the partnership. His capabilities span welding, hardfacing, shaft and knife rebuilding, complex assembly, hydraulics, and complete electrical engineering services, delivered in collaboration with a trusted partner company based in Halle/Saale.
Operating from Worbis, Germany, Mr. Baur is strategically positioned to provide emergency support across the European Union within 24 hours, covering an operational radius of approximately 1,000 kilometres.
Supporting this capability is a well-equipped service infrastructure comprising 12 Mercedes Sprinter service vans, a team of 24 skilled technicians, specialised bearing-change tools, a fully equipped hydraulic workshop, and a 1,000-square-metre facility with a five-ton crane track. Together, these resources position his team to manage the complete spectrum of Fornnax’s European service requirements efficiently and reliably.
Partnership Driven by Industry Insight
Having spent years servicing Eldan, Lindner, and Vecoplan shredders across the European recycling industry, Mr. Baur’s decision to collaborate with Fornnax is rooted in his understanding of market needs and customer expectations. His experience has provided valuable insight into what recycling plant operators require—not only from their machinery but also from the service teams supporting them.
According to Mr. Baur, Fornnax’s reputation for robust machine construction, superior wear protection, and maintenance-friendly design made the partnership a natural fit.
The collaboration comes at a time when Europe’s tyre recycling industry is facing mounting challenges, including rising cost pressures, shrinking margins, delayed investments, and a shortage of skilled labour. Mr. Baur believes these conditions reinforce the need for technically strong service partners capable of delivering rapid, dependable support.
Commenting on the partnership, he said, “Fornnax, with its exceptional price-performance ratio and superior quality, has the potential to become a market leader in Europe. We would like to be their service partner in this journey.”
Comprehensive Support Across the Equipment Lifecycle
As Fornnax’s authorised service partner, Mr. Baur will oversee the complete lifecycle support of the company’s equipment throughout the European Union. His responsibilities will include installation, commissioning, preventive maintenance, emergency repairs, and spare parts support across mechanical, hydraulic, and electrical systems.
Looking ahead, he also plans to develop a centralised spare parts distribution hub for European customers, particularly if Fornnax establishes a warehouse facility in Worbis to facilitate faster deliveries. To further strengthen service coverage, Mr. Baur intends to expand operations by adding two to three additional service teams and vehicles each year, progressively increasing capacity across the continent.
A Shared Commitment to Customer Excellence
Highlighting the strategic importance of the partnership, Mr. Jignesh Kundaria, Director and CEO of Fornnax, said:
“We strongly believe that by continuously improving our service quality and customer satisfaction index, we can build long-term relationships with our customers. Higher customer satisfaction leads to greater trust, which significantly increases repeat orders and ultimately drives sustained growth in our sales revenue.”
This customer-first philosophy underpins Fornnax’s strategy of building a dedicated European service partner network instead of relying solely on remote support. With Mr. Baur joining this network, customers across the European Union will benefit from faster response times, expert technical assistance, and dedicated on-ground support from a partner with extensive experience in high-throughput shredding operations.
Mr. Baur’s appointment also reflects Fornnax’s broader ambition to establish itself as the preferred shredding solutions provider for the European recycling industry, marking another important milestone in the company’s international growth strategy.
Concrete
Nuvoco Vistas launches Limla cement plant, expands Gujarat footprint
Published
2 weeks agoon
July 13, 2026By
admin
Nuvoco Vistas opens a 2 MMTPA grinding unit at Limla, entering Gujarat and advancing its target of 35 MMTPA capacity by FY 2028.
Surat (Gujarat)
Nuvoco Vistas Corporation Ltd, a part of Nirma Group and one of India’s leading building materials company, has inaugurated the Limla Cement Plant in Surat (Gujarat), one of Vadraj Cement Limited’s (VCL) principal manufacturing facilities. The commissioning represents a key milestone in Nuvoco’s acquisition and restoration of VCL, while supporting the company’s expansion across the Western Indian cement market.
Vadraj Cement Limited is a subsidiary of Nuvoco Vistas Corporation Limited and has installed cement capacity of 6 MMTPA across its assets. The Limla inauguration therefore represents the first operational step in the acquired platform’s wider revival, while the Kutch facilities provide clinker supply, mineral security and coastal logistics support for the western business.
Nuvoco completed its acquisition of Vadraj Cement Limited, then under the Corporate Insolvency Resolution Process, after paying a consideration of Rs 1,800 crore in June 2025. VCL’s asset portfolio comprises a clinker unit at Kutch and a grinding unit at Limla in Surat. It also includes high-quality captive limestone reserves and a captive jetty at Kutch, supporting more efficient logistics. Following the takeover, Nuvoco began an extensive programme of restoration, refurbishment and expansion at both locations, leading to the commissioning of the Limla plant.
The Limla Cement Plant is expected to support a phased increase in sales volumes across Gujarat. It will also help Nuvoco supply neighbouring markets in Western Maharashtra and release cement capacity from its northern plants, which can consequently be redirected towards markets in North India. The plant will manufacture a full portfolio comprising Ordinary Portland Cement, Portland Slag Cement, Portland Pozzolana Cement and Portland Composite Cement. It will additionally produce the complete Nuvoco Duraguard range, including the premium Nuvoco Duraguard Microfibre product. The acquisition is also expected to generate operational synergies with Nuvoco’s existing plants at Nimbol and Chittorgarh in Rajasthan, improving logistics optimisation and market reach across important regional markets.
The grinding unit at the Limla Cement Plant was completed ahead of schedule, with 2 MMTPA of capacity now inaugurated to expand Nuvoco’s operating scale and customer reach. After Vadraj Cement’s assets become fully operational, plants in North and West India are expected to account for nearly 40 per cent of Nuvoco’s total cement capacity. This will broaden the company’s manufacturing network, strengthen access to high-growth markets and support its plan to increase consolidated cement capacity to 35 MMTPA by FY 2028, reinforcing its longer-term growth strategy.
Commenting on the development, Jayakumar Krishnaswamy, Managing Director, Nuvoco Vistas Corp Ltd, said: “The inauguration of the Limla Grinding Unit in Surat is an important milestone in Nuvoco’s growth journey and demonstrates our commitment to disciplined, value-accretive expansion. Gujarat is strategically significant for Nuvoco, with substantial opportunities arising from infrastructure investment, industrial growth, rapid urbanisation and continuing demand from the housing and construction sectors. The facility strengthens our regional footprint, improves operational flexibility and increases our ability to serve customers across northern and western markets with greater reliability and efficiency.”
He added: “Through the Vadraj acquisition, we have refurbished and restarted a strategically important asset, returning it to operations in record time through strong execution and collaboration between teams. The achievement demonstrates our ability to create value from acquired assets, fulfil our commitments and retain the confidence of stakeholders. It also highlights the strength of our project delivery capabilities and our continued focus on building sustainable, profitable growth over the long term.”
Nuvoco Vistas Corporation Limited is a building materials company whose vision is to build a safer, smarter and more sustainable world. It is among the leading players in East India and has a significant presence across North and West India. Nuvoco began operations in 2014 with a greenfield cement plant at Nimbol, Rajasthan. It later acquired Lafarge India Limited, which had entered India in 1999, followed by Emami Cement Limited in 2020 and Vadraj Cement Limited in April 2025. The company has also announced an expansion in eastern India through a new grinding mill at the Arasmeta Cement Plant, supported by several debottlenecking programmes involving equipment upgrades, process improvements and internal capacity initiatives. These developments place Nuvoco on track to achieve total cement capacity of approximately 35 MMTPA. The company reported total income of Rs 11,362 crore in FY 2025-26, reflecting its continuing growth trajectory.
Nuvoco operates a diversified portfolio across three segments: Cement, Ready-Mix Concrete and Modern Building Materials. Its cement portfolio includes Concreto, Duraguard, Double Bull, PSC, Nirmax and Infracem, covering Ordinary Portland Cement, Portland Slag Cement, Portland Pozzolana Cement and Portland Composite Cement. Its pan-India RMX business provides value-added products under Concreto for performance concrete, Artiste for decorative concrete, InstaMix for ready-to-use bagged concrete, X-Con covering M20 to M60 grades, and Ecodure for specialised green concrete. Nuvoco has supplied materials to projects including the Mumbai-Ahmedabad Bullet Train, Birsa Munda Hockey Stadium in Rourkela, Aquatic Gallery at Science City in Ahmedabad, and metro railway projects in Delhi, Jaipur, Noida and Mumbai.
Concrete
Green Construction Through Cement Innovation
Published
3 weeks agoon
July 2, 2026By
admin
Indian Cement Review (ICR) and Fuller Technologies brought industry, policy and technology leaders together to discuss how cement innovation can drive green construction at scale, writes Rakesh Rao.
India is building at a pace few countries can match. Highways, airports, housing, logistics parks, industrial corridors and urban infrastructure are reshaping the country’s economic geography. But beneath this growth story lies a difficult question: can India continue to build at scale without locking itself into a high-carbon future?
That question formed the core of an online panel discussion titled “Driving Green Construction Through Cement Innovation”, organised by Indian Cement Review (ICR) in association with Fuller Technologies as the Presenting Partner on June 25, 2026. The webinar brought together experts from cement technology, R&D, global industry platforms, building performance policy and international development cooperation to examine how low-carbon cement and material innovation can accelerate India’s green construction transition.
The discussion came at a crucial time. India has committed to achieving net-zero emissions by 2070 and reducing the carbon intensity of its economy by 45 per cent by 2030. At the same time, the country’s construction sector is expanding rapidly, driven by urbanisation, infrastructure development, housing demand and industrial growth. Cement, as one of the most widely used construction materials, sits at the heart of this transition. It is indispensable to development, but also central to the challenge of reducing embodied carbon in buildings and infrastructure.
Moderated by Nitika Krishan, Senior Urban Infrastructure and Sustainable Policy Consultant, the panel featured:
- Kiranmai Sanagavarapu, Director, Low Carbon Solutions, Fuller Technologies;
- Dr Hemantkumar Aiyer, VP and Head R&D, Nuvoco Vistas Corp Ltd;
- Devika Wattal, Innovation Lead, Global Cement and Concrete Association (GCCA);
- Dr Sunita Purushottam, MD, GBPN India (Global Buildings Performance Network); and
- Vaibhav Rathi, Senior Technical Advisor, GIZ (the German Agency for International Cooperation)
Setting the tone for the discussion, Nitika Krishan underlined the scale of the challenge before the sector. “The question before us is no longer whether we build, but how we build sustainably,” she said. She pointed out that construction accounts for nearly 40 per cent of global energy-related carbon emissions when both operational and embodied carbon are considered. Cement production, she added, remains one of the hardest industrial processes to decarbonise.
For India, this is not merely an environmental issue. It is a development issue, a competitiveness issue and increasingly, a market issue. As one of the world’s largest cement producers and among the fastest-growing construction markets, India’s material choices will influence the carbon trajectory of its built environment for decades. As Krishan observed, sustainability solutions in economies such as India must not remain limited to laboratory success. They must be scalable, commercially viable and practical at national level.
The innovation gap: From technology to market
Experts believe that there is a need to bridge the innovation gaps for making decarbonisation in cement and concrete scalable. Devika Wattal of GCCA, explained, “The starting point must be the core cement manufacturing process itself. The first and foremost is the heart of our process, the heart of cement manufacturing. How do we reduce clinker? That is always a topic where industry is working very intrinsically.”
Clinker reduction remains one of the most important pathways for lowering emissions in cement. Since clinker production is energy-intensive and chemically emits carbon dioxide, reducing the clinker factor through supplementary cementitious materials (SCMs), blended cements and new chemistries can have a significant impact. Wattal also noted that carbon capture, utilisation and storage (CCUS) will have a role, though it may not be the first lever for all markets.
However, she stressed that innovation cannot stop at technology development. A solution that works in the lab must also be adaptable to industry, scalable in production and acceptable in construction practice. “It is important for that innovation to be adaptable, to be scalable, and so that it can be executed in real time,” she said.
Wattal also called for stronger enabling systems around innovation. These include performance-based standards, product-level embodied carbon databases and clearer frameworks for evaluating green materials. Without these, low-carbon cement products may struggle to compete with conventional materials in procurement and design.
R&D must balance carbon, cost and performance
Bringing in the R&D perspective into the discussion, Dr Hemantkumar Aiyer of Nuvoco Vistas emphasised that low-carbon cement development cannot be treated as a single-variable exercise. Cement must perform in real construction conditions. It must deliver strength, durability, consistency and cost competitiveness, while also reducing carbon.
“The root of understanding and balancing all these aspects lies in materials, and knowing the materials,” he said.
According to Dr Aiyer, R&D teams must understand the variability of raw materials such as fly ash, slag and clinker. Different sources produce different material behaviours. This makes mix optimisation, material characterisation and processing-property relationships critical. When performance is affected, cement manufacturers must understand how strength enhancers, admixtures and other performance chemicals interact with the material system.
He also linked material science with process efficiency. Clinkerisation takes place at extremely high temperatures, around 1,400 to 1,450 degrees Celsius. Any improvement in raw mix design, process control or energy optimisation can, therefore, help reduce emissions and cost. Dr Aiyer pointed to artificial intelligence-based optimisation, Cement 4.0 tools and advanced software as important enablers for real-time process and material control.
“The more you understand the materials, the more you can control it,” he said.
LC3: The promise is proven, the sequencing is not
Limestone calcined clay cement, commonly referred to as LC3, has attracted global attention because it can reduce clinker content significantly by using calcined clay and limestone while maintaining performance in many applications. Kiranmai Sanagavarapu of Fuller Technologies said the technology itself has already moved beyond proof of concept. Fuller Technologies has worked with calcined clay technology for nearly two decades and has seen plants running in France and Ghana. These plants, she said, are meeting local and national specifications, while the economics are beginning to make sense.
“The calciner is performing, the economics is stacking up, it is making business sense to produce,” she said.
But if the technology is viable, why has adoption not scaled faster? For Sanagavarapu, the answer lies in project sequencing. Too often, clay characterisation happens after equipment is specified. This, she warned, is a backward approach because calciner design depends on clay mineralogy, kaolinite content, iron levels, reactivity, moisture and other variables.
“If you don’t know what your deposit looks like before you commit for the equipment, you are, in a way, going blind into designing,” she said.
She also identified permitting and plant integration as major bottlenecks. Environmental clearances, mining permissions and local regulatory approvals must begin early. Similarly, calcined clay must be integrated into existing grinding, blending and logistics systems from the design stage, not treated as an afterthought during commissioning.
India already has IS 18189:2023 standard for LC3, but Sanagavarapu pointed out that the standard is not yet visible enough in procurement documents. “The gap between what is technically being permitted and what the procurement is asking is the single biggest bottleneck,” she said.
In her view, successful scale-up depends on getting the sequence right: clay characterisation first, permitting in parallel, standards aligned with construction, and integration built into plant design.
India’s LC3 journey: Progress, but demand remains thin
Providing details of India’s LC3 commercialisation experience, Vaibhav Rathi of GIZ noted that JK Cement carried out the first commercial production of LC3 at its Rajasthan plant, followed by JK Lakshmi Cement three months later. These initiatives were supported by the International Climate Initiative of the Government of Germany, with IIT Delhi contributing deep institutional knowledge on LC3 research and BIS certification.
Rathi said India’s early experience has produced clear lessons. One of the biggest was the need to build capacity among regulators. While BIS certification existed, State Pollution Control Boards were unfamiliar with the technology and unsure about the approval pathway.
“The capacity building is not just needed amongst the producer and the users of the cement, but also the regulators who are working with this technology for the first time,” he said.
He also highlighted the need for better information on China clay deposits. Since China clay is currently classified as a minor mineral, centralised data on availability, quality and location is limited. If cement manufacturers are to adopt LC3 at scale, stronger mineral intelligence will be important.
The third issue is demand. LC3 has already been used in projects such as Palava City in Mumbai and Noida International Airport, but these remain limited examples. “It is in a chicken and egg situation,” Rathi said. “Cement companies are saying we need more demand, and users are saying there is not enough cement available.”
Public procurement, he suggested, could help break this cycle. If agencies such as CPWD and other public bodies begin testing, accepting and specifying LC3, it could create the market confidence needed for cement companies to invest in production and storage.
Building codes must catch up with innovation
Dr Sunita Purushottam of GBPN India argued that material choices will determine built environment emissions over the long term, but India’s current policy signals remain fragmented. Although LC3 has received BIS recognition, she pointed out that building codes, municipal bylaws, schedules of rates and sustainability codes do not yet provide uniform guidance on low-carbon cement.
“The current cement regulations are largely prescriptive and favouring traditional materials,” she said. This limits the ability of alternative materials to compete on performance, durability and emissions.
Dr Purushottam also raised the issue of taxation. Cement, including LC3, currently falls under the same GST bracket as conventional cement. A differentiated tax structure, she argued, could help accelerate market adoption. “In order for the market to demand LC3, that differentiation in the GST could go a long way,” she said.
She noted that green building certifications such as IGBC and GRIHA are already creating demand for low-carbon materials by assigning points for embodied carbon and sustainable material use. However, she said large-scale adoption will require regulatory mandates, particularly through building codes and state-level notifications.
She also cautioned that low-carbon cement alone does not solve the entire building performance problem. A material may reduce embodied carbon, but the operational carbon of a building depends on thermal performance, design, insulation and energy use. “The energy part has two elements,” she said. “One is the embodied carbon of the material itself, and the other is the operational carbon.”
Collaboration is the bridge between invention and impact
Wattal said GCCA sees innovation as a strategic priority and works through platforms that connect industry with academia and start-ups. “There is no way we will decarbonise our sector without innovation,” she said.
However, she stressed that research must be connected to actual industry challenges. Innovations developed in isolation may fail when they encounter real-world barriers such as raw material variability, plant integration, cost, standards and finance. Start-ups, too, need industry mentorship and scale-up pathways.
Wattal also flagged the importance of finance. Even strong technologies may struggle to attract investment if there is no common understanding of bankability. “We have always put projects into, is this a bankable project? But the definition of a bankable project has never been defined,” she said.
For India, she saw strong potential in its academic and start-up ecosystem, but said the challenge lies in alignment and prioritisation. The country has the research base, industrial capacity and market size. What it now needs is a coordinated route from innovation to deployment.
There is a practical concern for cement manufacturers: how can existing plants be adapted for lower emissions without compromising reliability or commercial viability?
Kiranmai Sanagavarapu addressed, “The reliability risk in calcined clay retrofit is definitely real, but it is almost always self-inflicted. The risk arises when a new process is added to an existing circuit without properly redesigning grinding and blending configurations.”
Existing cement plants, she explained, can take two broad routes. The first is external sourcing of calcined clay combined with mill optimisation. This requires lower capital investment and can potentially move in 12 to 18 months if other conditions are in place. It may reduce emissions by around 20 to 30 per cent. The second route is integrated calcination on site, which requires higher capital expenditure and longer lead times, but provides greater control over quality, supply and emissions reduction potential.
For Sanagavarapu, the principle is simple: low-carbon retrofits must be designed with intent. “Design it with an intent properly from the start. Start in the market conditions where the economics are already working,” she said.
Circularity: The overlooked advantage
According to Vaibhav Rathi, fly ash and slag are already well established in cement and construction (C&D), but construction and demolition waste remains underutilised. “C&D waste is a growing business opportunity which not many have taken up,” he said. India’s continuous construction and demolition activity creates huge volumes of waste, much of which contributes to air pollution, land degradation and material inefficiency. With the right processing and standards, this waste can be converted into useful construction products.
Rathi also pointed out that LC3 has a circular economy dimension that is often overlooked. It can use low-grade kaolin-rich clay left behind after high-grade clay is extracted for other applications. “LC3 is not only a low-carbon solution, but also a circular economy solution,” he said.
At the same time, he cautioned that LC3 in India is not yet cheap because it has not reached scale. Site-specific techno-commercial feasibility studies, supported jointly by development agencies and industry, could help companies assess whether LC3 production makes technical and financial sense at a given location.
Dr Purushottam added that India must address both low-carbon cement and construction waste together. “Both low-carbon cement and C&D waste go hand in hand. India does not have an option but to work on both,” she said.
Dr Aiyer called for policy shifts from both government and industry, including preferential purchasing of sustainable materials, minimum supplementary cementitious material requirements in public and public-private projects, and faster regulatory implementation. “If we can fast-track the regulatory standards and their implementation on the ground, that is the way to go,” he said.
From green ambition to green construction
Cement innovation is no longer only about chemistry. It is about systems. Low-carbon cement will scale only when technology, standards, procurement, finance, regulation, education and construction practice move together.
LC3 and other low-carbon technologies have shown promise. India has early commercial examples, strong research capability and growing market interest. But mainstream adoption will depend on whether demand can be created, regulators can be capacitated, standards can be embedded in procurement, and manufacturers can see a clear business case.
For a country building at India’s scale, the opportunity is enormous. Cement will continue to be central to infrastructure and urban development. The challenge now is to ensure that the cement used in India’s growth story carries a lower carbon burden.
- Rakesh Rao
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