Economy & Market
Clearing the Air in Cement
Published
10 months agoon
By
admin
Effective dust control defines the health, efficiency, and sustainability of every modern cement plant. ICR explores how advanced filtration, smart design, and vigilant monitoring are shaping cleaner, compliant, and future-ready operations.
The generation of dust in cement production is far from a mere nuisance — it carries serious health, environmental, and operational consequences. In many industrial hubs across India, concentrations of PM2.5 and PM10 routinely exceed both national and World Health Organisation limits, intensifying respiratory and cardiovascular burdens on surrounding communities and workers. According to a review in Cement Industry Pollution and Its Impact on the Environment (MDPI), chronic exposure to cement dust is linked to impaired lung function, bronchitis, asthma, and even cardiovascular ailments.
Moreover, dust does not only threaten human health — it corrodes machinery, reduces equipment life, and degrades product quality through contamination. In cement plants, uncontrolled emissions from mills, crushers, coolers, and material handling can lead to 7–10 per cent loss of product as fugitive dust. This hidden inefficiency translates into higher energy costs, increased maintenance and consumables, and compromised environmental performance. It’s therefore not just an issue of compliance — dust control is integral to both operational excellence and sustainable stewardship.
Sources of dust across the cement process
Dust generation in cement manufacturing begins right at the source: raw material handling and preparation. Bulk material movement — loading, unloading, conveying, and crushing of limestone, clay, and other raw feed — liberates particulates, especially fine dust. According to dust-monitoring sources, clinker coolers, crushers, grinders, and material-handling equipment are among the principal dust emission points within a plant. In addition, the preheating and pyroprocessing zones see fugitive dust from kiln feed handling, preheater cyclones, and internal recirculation flows — all of which require robust interception and filtration upstream of the main stack.
Clinker production and cooling stages are especially dust-intensive, because hot clinker is quenched and cooled, releasing fine particulates and dust. According to Cement Industry Pollution and Its Impact on the Environment, particulate emissions remain one of the key pollution sources throughout cement production, including from kiln and cooler exhausts. In many plants, coolers’ air discharge carries significant dust load unless intercepted through bag filters or dedusting units. Moreover, in clinker transport and storage — including rotary or bucket transfer systems — mechanical abrasion and wind entrainment can cause further dust losses.
The cement grinding and packing section also contributes substantial dust emissions. The fine grinding of clinker, gypsum, and additives creates ultra-fine particles that can escape if mill circuits, separators, or filter stages are not optimally designed. Material spillage, pneumatic conveying, and packaging operations are common sources of fugitive dust in this zone. In operational literature, raw material handling followed by cement grinding are regularly cited as among the highest dust contributors in a cement plant.
Lalit Joshi, Co-Founder and Director, LeapThree Materials says, “Advanced non-woven materials are using different high-performance fibres and blending of the same to achieve effective and customised solutions for the projects and individual units to meet the targets sets by stringent emission norms. Though we are far from the western countries benchmark of allowed emission, but it has come down drastically in recent years and plants are also doing all the compliance using advanced materials made using high performance fibres like polyacrylonitrile, meta aramid and poly imide.”
Filtration technologies
Filtration is central to dust control in cement plants, because even with preventive design measures, residual particulates must still be captured before flue gases are emitted. Among the most widely used systems today are fabric filters (bag filters), electrostatic precipitators (ESPs), and hybrid combinations or newer gas-cleaning technologies. According to a review in Journal of International Society for Science and Engineering (2025), fabric filters boast superior performance in capturing fine particulate matter, largely independent of gas conditions, making them especially effective for meeting stringent emission norms. ESPs remain favoured in some high-temperature stages due to their ability to operate with lower pressure drop and lower parasitic energy when conditions are ideal, but they are sensitive to gas composition and require careful design.
In practice, many plants have shifted from ESPs to bag filters—or retrofitted existing ESPs into hybrid configurations—to meet stricter emission standards. In fact, utility in the cement industry has shown that replacing ESPs with bag filter systems can reduce outlet dust concentrations from around 35 mg/m³ down to 6 mg/m³. According to Improvement of Cement Plant Dust Emission by Bag Filter (2018), this also yielded a marginal CO2 reduction by virtue of lower electricity consumption. Such performance gains are a driving factor behind the trend: many industry voices now regard bag filters as the new benchmark for gas filtration in cement plants, especially in plants aiming for ultra-low emissions.
Yet filtration systems are not without challenges. Filter media degrade over time, leakage or bag damage can erode performance, and maintenance becomes critical. A recent study A Study on Failure Rate, Reliability, and Collection Efficiency Trend of Bag Filters in a Cement Plant (2023) observed that while bag filters can achieve initial efficiencies approaching 99.998 per cent, collection efficiency may decline to ~95.05 per cent by the 15th year of service. To sustain high performance, design must account for filter area, pulse cleaning strategy, gas flow distribution, fabric selection (e.g. temperature resistance, chemical resistance), and ease of maintenance access. Hybrid systems—combining ESPs, cyclones, or scrubbers with bag filters—are increasingly popular in complex gas streams to balance efficiency, energy consumption, and reliability.
Prevent, optimise, maintain and monitor
Preventive design and process optimisation form the first line of defence in effective dust control — the goal is to minimise dust generation before filtration even begins. Thoughtful layouts of conveyors, transfer points, drop heights, and enclosure strategies can substantially reduce entrainment. For example, optimising air velocities to keep dust entrained, ensuring proper duct slopes, and minimising sharp drops in material transfer all help suppress fugitive emissions. Using enclosed and covered conveyor systems, choke points, and inerting measures further curbs dust liberation. In the context of cement plants, integrating dust minimisation into process design — for instance by matching pneumatic transport pressures, reducing material tumbling, and limiting turbulence — creates a baseline reduction in the dust load that filtration systems must handle.
Maintenance and monitoring are equally crucial for sustaining filtration effectiveness over the long term. Even the best-designed system will lose performance if leaks, worn media, or dirty filters go undetected. According to A Study on Failure Rate, Reliability, and Collection Efficiency Trend of Bag Filters in a Cement Plant (2023), collection efficiency of bag filters can fall from 99.998 per cent in the early years down to ~95.05 per cent by the 15th year, underscoring the need for vigilant upkeep. Regular inspections, bag leak detection systems, and real-time monitoring of differential pressures and gas flows help identify underperforming compartments before they compromise overall performance. Use of distributed optical fibre or pressure sensing within baghouses is increasingly being explored to localise bag failures.
Jerad Heitzler, Training Manager, Martin Engineering says, “Dust emissions don’t just create a harmful environment for those working in the area. Abrasive particulates make their way into exposed machine parts and rolling components, causing them to wear quicker, seize and require replacement sooner. Particulates also clog air intakes of nearby equipment, further raising the need for maintenance and downtime. Then as it settles, dust builds up to cover walkways and stairs, engulfing control units, obscuring signage and, in some cases making access for maintenance impossible without a full shutdown and clean-up.”
To optimise maintenance planning, predictive and condition-based strategies are becoming indispensable. Rather than rigid maintenance schedules, data-driven health indices (e.g. pressure drop trends, pulse valve performance, vibration, temperature anomalies) can trigger maintenance only when needed, reducing unnecessary downtime. Application of preventive maintenance scheduling models, such as those developed via mathematical programming or metaheuristic algorithms, helps cement plants balance reliability and cost in their bag filter programmes. This approach ensures both high dust collection performance and economic operation over the life of the system, turning filtration integrity into a reliable contributor to sustainable plant operation.
Energy and cost
Energy consumption is a significant component of the cost equation when deploying dust filtration systems — the energy needed to drive fans, maintain pressure differentials, and operate cleaning pulses adds up. According to Energy Benchmarking Manual for the Indian Cement Industry (2023), many Indian cement plants are already among the world’s most efficient, yet still have considerable headroom for energy improvements given the wide performance spread across the industry. In fact, in cement manufacturing more broadly, energy expenditures (fuel + electricity) often account for 20-40 per cent of total production costs. Thus, any inefficiency in filtration — high resistance, leaks, or excessive cleaning cycles — directly burdens the bottom line.
On the upside, well-designed filtration systems and process integration can actually yield energy savings and cost reduction. For example, deploying advanced waste-heat recovery (WHR) solutions can lower clinker costs by 3.81 per cent and cut indirect CO2 emissions substantially, making the overall process more energy efficient. Moreover, optimising filter design — reducing pressure drop, improving gas flow distribution, using pulses more judiciously, and selecting low-resistance fabric — can diminish fan power demand. In the context of dust collection, using reverse-air regeneration or intelligent control to avoid over-cleaning can further trim energy use. In sum, the cost of filtration should be viewed not merely as a parasitic load but as an opportunity: every kilowatt saved reinforces the case for high-performance, low-emission plant design.
Regulatory framework and emission standards
India has a structured regulatory framework governing emissions and dust control, primarily enforced through the Central Pollution Control Board (CPCB) under the Environment (Protection) Act, Air Act, and allied rules. The CPCB has issued Guidelines for Continuous Emission Monitoring Systems (CEMS) to ensure real-time measurement of stack pollutants including particulates, SO2 and NOx, and mandates minimum stack heights (usually 30 m) to assist dispersion. In addition, ambient air quality norms (National Ambient Air Quality Standards, NAAQS) set upper limits for PM2.5 and PM10 concentrations in industrial zones, which industries must help adhere to through emission control.
More recently, regulatory impetus is tightening further: many state pollution control boards are demanding stricter limits on particulate emissions (e.g. 50 mg/Nm³ target values), zero or minimal fugitive emissions plans, and rigorous leak-detection and control systems. According to a report by emerging industrial norms, plants failing to comply with emission or fugitive dust standards may face penalties, closure orders or forced remedial action. Moreover, environmental clearances for new expansions and modernisation increasingly require demonstration of best available technologies (BAT) for dust control and air pollution—pushing filtration systems and process optimisation into the sphere of not just compliance but strategic investment.
Conclusion
The road to sustainable air management in the cement industry lies in recognising that dust control is no longer an operational add-on but a defining feature of modern plant design and environmental stewardship. From quarry to kiln and grinding to packing, every stage of production now demands an integrated approach that prioritises preventive design, energy-efficient filtration, and continuous monitoring. With CPCB’s tightening emission
norms and global ESG expectations, compliance has evolved into a matter of reputation and resilience. A truly sustainable plant must minimise its particulate footprint not only within regulatory limits but also in alignment with community expectations and climate objectives. The cement sector, as one of India’s most energy- and emission-intensive industries, stands to gain enormously by embedding smart dust control and air-management strategies into its sustainability roadmap.
Looking ahead, the convergence of digitalisation, advanced materials, and predictive maintenance will redefine how cement plants manage air quality. Data-driven diagnostics, AI-assisted leak detection, and adaptive fan-control systems will ensure filtration operates at peak efficiency while conserving energy. But technology alone cannot deliver sustainability; it must be matched with a culture of accountability, skilled workforce training, and continuous process improvement. The journey towards sustainable air management is, therefore, not just about cleaner stacks — it is about creating plants that breathe efficiency, responsibility, and innovation into every cubic metre of air they release.
– Kanika Mathur
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Economy & Market
Fornnax Names Lukas Baur as Authorised Service Partner to Bolster EU Operations
Published
5 hours 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
1 week 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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