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Maximising AFR in Cement Manufacturing

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Shreesh A Khadilkar, Consultant and Advisor, and Former Director Quality and Product Development, ACC Ltd Thane, discusses the importance of optimising the use of alternative fuel and raw materials (TSR percentage) in cement production without affecting clinker quality.

We all know that in the calciner the CaCO3 undergoes calcination producing CaO, part of this CaO reacts with Al2O3, Fe2O3 SiO2 to form aluminates, ferrites, Belite and some CaO remain as uncombined CaO in the material that enters the kiln, this uncombined CaO further reacts, as the material passes through the kiln to form clinker of desired phase composition with at desired levels of free lime. If this uncombined CaO is less, the resultant clinker would have lower free CaO.
Due to fluctuations of moisture in the SAFR feed, the calciner outlet temperature tends to decrease/fluctuate although the calcination is complete, some of the above post calcination reactions of the CaO are decreased, as a result the uncombined CaO is higher, in the material entering the kiln. The reactions in the kiln are affected for the same throughput and either the clinker free lime is high or the clinker shows lesser C3S percentage (depending on the burnability of the kiln feed).
In plants equipped with XRD it would be possible to monitor the uncombined CaO in Hot meal and optimise the Calciner outlet temperatures so as to achieve the desired uncombined percentage of lime as explained above. If the value is much lower than the desired level it would indicate subsequent lower LSF in the clinker, so addition of lime sludge or limestone powder as explained above would maintain the desired clinker specs. These actions, if affected during the day, would help maintain the day’s average clinker quality.
Besides the variability of the moisture percentage, the ash percentage and its composition in SAFR could change the composition of calcining material and finally depending on these changes, the post calcination reactions would be affected, depending on the uncombined percentage of lime value (monitored by XRD of hot meal), the corrections as explained above would help correct the composition and maintain the burning zone performance and the resultant clinker quality. Thus, if the calciner outlet temperature / kiln inlet material / C6 material temp. (as the case may be) is maintained higher and necessary corrections are made through SAFR or through the kiln feed. We can maintain the uncombined CaO at desired level where we could get good kiln performance as well as a good/improved clinker quality even at a higher percentage of AFR/TSR.
In many plants there is a tendency to increase the clinker Fe2O3 as and when there is an excessive dust generation and dusty kiln performance, this attempt to increase Clinker Fe2O3 would not actually help in improving the kiln conditions and maintaining clinker quality. In another plant equipped with XRD, the limestone had higher Fe2O3 content and to compensate for the effect of the varying moisture of SAFR the Calciner outlet temperature was maintained at around 920oC so that the desired post calcination reactions could be achieved and the uncombined CaO (monitored by XRD of hot meal) was maintained at desired levels.
The clinker LSF also could be maintained but the Free CaO tended to be high. The hot meal XRD indicated that the belite formations were lower in hot meal as and when the clinker free lime was high. Although the Silica was contributed from the Solid AFR as this silica was sand/silt, which did not react, the clinker IR also was observed to increase by around 0.4 per cent use of pondash (having reactive silica) along with the solid AFR up to 1 per cent was observed to increase the Belite content of hot meal and the resultant clinker had desired phase formations with lower free lime. For calculation of PSF/Potential phase composition a correction was given to the clinker silica contents (by subtracting the change in IR of clinker).
Thus, it needs to be noted here that in RDF/MSW, SAFR the ash content may have coarse sand grains, which cannot at the calcination stage and it the burnability is sensitive to silica contents, such corrections of use of wet fly ash with the SAFR could be advantageous to maintain clinker quality. However, these corrections have to be affected during the day through XRD monitoring of Hot meal and subsequent Clinker (say after 40 minutes) so that at the end of the day the clinker is of desired quality specs.
Thus, in plants coprocessing higher levels of AFR it is recommended to have a ‘bi-hourly dashboard’ and the day average clinker consistency in Quality Monitored by ‘compliance percentage to clinker specs’ as shown in Tables 1 and 2.
Such a dashboard helps having the entire plant operations involved in taking bi hourly actions so as to maintain the quality and process targets with increase in SAFR/LQAFR thus, achieving a higher compliance percentage to clinker quality specs. This has enabled not only to maintain clinker quality but it also showed improvements in clinker quality.

Actions: In plant with high TSR percentage without XRD
The hot meal samples at different kiln inlet material temperatures were collected at 870,900n and 930oC along with corresponding clinker samples (after say 40 minutes) and the XRD analysis was carried out at external labs. Through the bi-hourly dashboard actions the clinker compositions were maintained as per desired target. The XRD Mineralogy of Hot Meal and clinker XRD are tabulated in Table 3.
Although the plant maintains 95 per cent DOC, the XRD however indicates >99.5 per cent calcination. Thus, even in the absence of XRD using the bi-hourly dashboard optimisation of clinker quality can be made possible, however having an XRD (even a low watts XRD) would always be advantageous, especially if the kiln feed shows moderate burnability.

Other important considerations

  • As discussed above bi-hourly corrections made to clinker composition could be through the SAFR/RDF mix, in one plant it could be use of waste lime sludge/ in another plant use of wet pond ash/ in another use of limestone crusher dust/ high grade limestone powder depending on the corrections desired.
  • In case such materials are not available in the plant for corrections, the necessary actions bi-hourly, to adjust the clinker LSF, could be by changes in proportion of high ash coal + coal Petcoke mix in calciner or it could be even be targeting an appropriate kiln deed composition to accommodate the ash percentage of SAFR/RDF or bihourly changing the feed rate (TPH) of SAFR, as per the bi-hourly clinker composition requirements.
  • Reducing conditions can have substantial effects on clinker quality like problems with sulfur integration, Alite decomposition (strength reduction), conversion from C4AF to C3A (acceleration of setting), change in color of cement (from greenish grey to brownish), the detection of reducing conditions could be done using ‘Magotteaux Test’, it is important to assess the reducing conditions whether internal or peripheral, would indicate possible reasons.
  • Internal reducing conditions indicate that due to changes in liquid viscosity the larger clinker nodules are black from outside but yellow to brownish in the internal core. Such clinker nodules roll down from the transition zone with an unburnt core which disintegrates on cooling due to gamma C2S. Such nodules have high free lime, delocalised or peripheral reducing conditions due to larger size of solid AFR component (shredded size) showing CO peaks.
  • The Hot meal (2Cl+SO3) needs to be reliably monitored using XRF standards of Hot Meal. Every plant would have a threshold value of (2Cl+SO3), value >3.5 is reported to cause severe depositions at kiln inlet/riser duct/cyclones.
  • The kiln system should be able to handle the higher gas volumes (calciner , inlet and preheater).
    Increased percentage of AFR /TSR is associated with increase in limestone pile LSF which is linked to life of mines (Fig:2). This increase in limestone pile LSF would be more plant specific.
  • To lessen the impact on limestone Pile LSF/Mines life the plant would have to use, sweetener limestone (availability/cost), reduce the percentage use of high silica correctives with purer correctives, use petcoke or low ash coal (imported), use of waste lime sludges available from chemical industries.
  • As discussed earlier the plant could use a mix fuel (petcoke + high ash coal), or (mix of petcoke + high ash wastes like Dolochar/spent carbon etc.) in the calciner, the mix ratio could be changed so as to improve clinker LSF during the day (as a bi-hourly actions).
    High ash (high iron/high silica) wastes should not be fired through the kiln fuel; these wastes should be put through calciner fuel if feasible or along with solid wastes. It is always beneficial to have low ash coal (fuel) / petcoke in kilns.
  • It is recommended to use 4 per cent to 5 per cent high LSF Limestone in petcoke grinding (especially for kiln fuel). It improves the efficiency of petcoke grinding and would help to bind the sulphur during combustion in kiln, thus decreasing the SO3 of the hot meal. Using limestone decreases the SO3 fluctuations in the clinker and the excess of CaCO3 forms C3S clusters in the clinker, thus, improving clinker grindability.
  • Petcoke grinding is usually controlled at 1 per cent to 2 per cent on 90 microns. However in certain grinding systems, the 45 microns residue is observed to be as high as 26 per cent to 28 per cent which could create reducing conditions and initiate some coating formation in pre pre-transition zone in kilns.
  • Large storage yards to stock different types of solid AFR would help to mix the waste in certain proportions so as to achieve relative consistency in ash percentage or even chloride contents.
  • An auto-sampler with shredder on the solid AFR conveyor would be useful. However, the analysis time would be around 4 to 5 hours which is too high.
  • If the plant is reaching >25 per cent TSR, from a futuristics angle, having an online Cross Belt analyser like ‘Spectra Flow’ could help analyse moisture percentage, ash percentage and its constituents in real time, enabling rapid corrections to clinker compositions with necessary modifications to the kiln system even much higher TSR levels could be achievable.
  • Higher TSR levels invariably are associated with increase in Hot meal alkalis, chlorides and sulphates and would necessitate chloride bypass.
  • The procurement has a high responsibility of providing appropriate SAFR/RDF fuel of different ash percentage and of different chloride percentage (screened to remove sand/mud/stones).
  • Wastes having CaO rich ash would always be advantageous for the same TPH of solid AFR, the TSR percentage would be higher if the NCY of the sold AFR is higher.

Conclusion
The paper indicates and discusses in some details the avenues for increased TSR percentage without affecting clinker quality. However, depending on calciner retention time and air volume availability there would be a certain maximum TSR percentage that can be achieved. It may be noted here that the kiln system would necessitate suitable upgradation for achieving a much higher TSR percentage. It is needless to mention that XRF Models with standardless software for elemental analysis of solid/liquid AFR would be advantageous and as discussed having an XRD would be a necessity to maintain clinker quality at higher TSR percentage.
Clinkers with High MgO (>4.5 per cent) would be a challenge and optimising the CaO/SiO2 ratio would be a key to improve clinker quality use of XRD in such clinkers would be an asset.
Futuristically, ‘Torrefaction Process’ (the process of degrading organic materials in a nitrogen or inert environment within a temperature range of 200oC to 300oC) of bio wastes if extended suitably to MSW wastes and other solid AFR to produce a bio coal, could become an excellent opportunity for increased TSR for cement plants.
In this paper I have tried to share some observations in a generalised manner made at different plants with different AFR/TSR percentage which could be useful for other plants for their future road map on maximising TSR percentage.

About the author:
Shreesh Khadilkar, Consultant and Advisor brings over 37 years of experience in cement manufacturing, having held leadership roles in R&D and product development at ACC Ltd. With deep expertise in innovative cement concepts, he is dedicated to sharing his knowledge and improving the performance of cement plants globally.

Concrete

Cement Makers’ Margins To Fall Rs 50-75 Per Tonne Amid West Asia Conflict

Crisil Sees Margins Easing Despite Steady Demand

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Crisil said operating margins of Indian cement manufacturers are expected to decline by Rs 50-75 per tonne (t) this fiscal to Rs 925-950 per t due to higher input costs triggered by the West Asia conflict. The analysis covered 18 cement companies accounting for nearly 90 per cent of India’s domestic cement capacity and noted margins had improved sharply to around Rs 1,000 per t in fiscal 2026.

Crisil noted that the reduction would be driven mainly by higher power and fuel costs, which account for about 30 per cent of total costs, as petcoke and imported coal prices have surged amid geopolitical uncertainties. Freight costs, which account for about a quarter of total costs, are also expected to remain elevated because of higher diesel prices. The impact on profitability is likely to be more pronounced in the first half of the fiscal year before easing commodity prices moderate cost pressures later.

The rating agency said steady domestic demand and strong balance sheets should keep credit profiles stable despite the moderation in margins. Green energy currently accounts for 35-40 per cent of the sector’s total electricity consumption and is expected to partly cushion higher energy costs. Operating cash flows are likely to remain resilient, supported by projected 6-7 per cent growth in cement demand this fiscal.

Crisil highlighted that demand growth will be driven primarily by infrastructure spending, which meets about one-third of sector consumption, and by a nearly 18 per cent higher budgetary allocation for core ministries that should support project execution. Weaker rural housing demand amid pressure on agricultural incomes from a possible below-average monsoon may be offset by improved urban housing demand supported by favourable home-loan rates and a strong pipeline of Pradhan Mantri Awas Yojana-Urban projects. Ongoing capacity additions will keep capital expenditure elevated and may lift net debt to EBITDA to between 1.2 and 1.4 times from around 1.0 time last fiscal, though ratios are expected to remain healthy.

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UltraTech Board Approves Rs 50 bn Fundraise Via NCDs

Company to issue half a million debentures for expansion plan

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UltraTech Cement’s board of directors has approved raising Rs 5,000 crore (Rs 50 bn) through non?convertible debentures issued in rupees.

The finance committee cleared a proposal to issue up to 500,000 fully paid, unsecured, listed, rated, redeemable, rupee?denominated, non?convertible, non?cumulative debentures of Rs 1 lakh each (Rs 0.1 mn each), aggregating to the Rs 5,000 crore programme.

As of June 2026 the firm reported net debt of Rs 15,875 crore (Rs 158.75 bn) and said its capacity expansion projects under execution are backed by capital expenditure of about Rs 17,000 crore (Rs 170 bn) over the next two to two?and?a?half years.

UltraTech spent Rs 9,500 crore (Rs 95 bn) on capital expenditure in financial year 2026 and in April the group crossed 200.1 mn tonnes per annum of domestic grey cement capacity and 205.5 mn tonnes per annum of global capacity.

The chief financial officer indicated the company would take consolidated capacity beyond 242 mn tonnes per annum, with grey cement capacity reaching 212.7 mn tonnes per annum by the end of financial year 2027. He noted the net debt?to?earnings before interest, taxes, depreciation and amortisation ratio stood at 0.87 times as of June 2026 and the company was confident of ending financial year 2027 with the ratio below one time.

In the first quarter of financial year 2026?27 UltraTech’s net profit attributable to owners rose 16.8 per cent year?on?year to Rs 2,599.3 crore (Rs 25.993 bn) and revenue from operations increased 15.9 per cent to Rs 24,648.20 crore (Rs 246.482 bn). The board approval is expected to complement internal cash flows as the company advances its expansion programme.

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Reimagining the Future

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From LC3 and AI-driven kilns to RDF gasification, ICR explores the full breadth of technological innovation reshaping India’s cement industry. Low-carbon materials, digital manufacturing, alternative fuels and breakthrough concrete science are collectively advancing the sector’s transition from high-emission commodity producer toward a net-zero, infrastructure-ready future.

Innovation has become the defining force shaping the future of the cement industry. As the world’s second-largest cement producer, India is witnessing rising demand driven by infrastructure development, urbanisation, affordable housing, and industrial growth. At the same time, the International Energy Agency (IEA) estimates that cement production accounts for nearly 7 per cent to 8 per cent of global CO2 emissions, with clinker manufacturing contributing the largest share, making innovation an operational necessity. The industry is therefore investing heavily in low-carbon cement technologies, artificial intelligence (AI), digital manufacturing, alternative fuels, renewable energy and carbon capture, utilisation and storage (CCUS). Innovations such as limestone calcined
clay cement (LC3), supplementary cementitious materials (SCMs), AI-driven process optimisation and automated quality control are enabling manufacturers to produce more sustainable, efficient, and high-performance cement.
According to the Global Cement and Concrete Association (GCCA), achieving net-zero emissions will require a combination of material innovation, digital transformation, circular economy practices and collaborative research, making innovation central to the industry’s long-term competitiveness and India’s sustainable infrastructure growth.

Next-generation cement
The future of cement lies in reducing its dependence on clinker-the most carbon-intensive component of cement-through the adoption of low-carbon materials and advanced blended cement technologies. Products such as Portland Pozzolana Cement (PPC), Portland Slag Cement (PSC), Portland Composite Cement (PCC), and LC3 are driving this shift by replacing clinker with SCMs like fly ash, GGBS, calcined clay and limestone.
According to GCCA, SCMs can replace 30 to 50 per cent of clinker, with some applications exceeding 70 per cent, significantly reducing carbon emissions without compromising strength or durability. These blended cements also improve concrete performance by enhancing durability, reducing permeability, and increasing resistance to chloride and sulphate attacks. As the availability of traditional SCMs declines with the decarbonisation of the power and steel sectors, the industry is increasingly exploring alternative materials and next-generation cement formulations to support long-term sustainability.
Shrivats Singhania, Deputy Managing Director, JK Lakshmi Cement, says, “Innovation is enabling the cement industry to address one of its most important challenges – producing more with fewer resources and lower emissions. Across the value chain, manufacturers are deploying technologies that simultaneously improve operational efficiency and advance sustainability goals. For example, greater adoption of alternative fuels, waste heat recovery systems, renewable energy, and digital process controls is helping reduce energy consumption and optimise resource utilisation. Data-driven manufacturing allows plants to monitor operations in real time, improve equipment reliability, minimise downtime, and reduce wastage, resulting in both environmental and economic benefits.”
“Meaningful progress is also being achieved through material innovation. The growing use of blended cements and next-generation products such as LC3 reduces dependence on clinker, the most carbon-intensive component of cement production, thereby lowering embodied carbon without compromising performance,” he adds.
Among emerging technologies, LC3 has gained global recognition as one of the most promising low-carbon cement innovations. In a standard formulation, LC3 comprises approximately 50 per cent clinker, 30 per cent calcined clay, 15 per cent limestone, and 5 per cent gypsum. LC3 can reduce CO2 emissions by up to 40 per cent compared with Ordinary Portland Cement (OPC) while delivering comparable strength and enhanced durability. Its reliance on abundant, locally available raw materials, rather than industrial by-products, makes it highly scalable and well suited to countries like India.
According to the LC3 Project, nearly 75 per cent of cement plants worldwide could adopt LC3 using existing manufacturing infrastructure, potentially reducing global CO2 emissions by over 400 million tonnes annually, if adopted at scale globally. India’s introduction of BIS standard IS 18189:2023 for LC3, coupled with its adoption in projects such as the Noida International Airport, marks a step toward commercial implementation. As demand for sustainable construction grows, LC3 is poised to become a cornerstone of low-carbon infrastructure development.

Making of a smart cement plant
The modern cement plant is rapidly evolving into a digitally connected, AI-enabled manufacturing ecosystem where data drives every aspect of production – from raw material proportioning and kiln operations to quality control, maintenance and energy management.
According to IEA, digital technologies can improve energy efficiency in heavy industries by 10 per cent to 20 per cent. Advanced process control systems in cement plants have demonstrated the potential to reduce thermal energy consumption by 3 to 5 per cent, lower electricity consumption by 2 to 10 per cent, and improve kiln throughput and clinker quality. AI-powered predictive maintenance further helps reduce unplanned equipment downtime by 30 to 50 per cent and extend equipment life by continuously analysing sensor data to detect failures before
they occur.
Jignesh Kundaria, Director and CEO, Fornnax Technology, says, “AFR is no longer viewed solely as a sustainability initiative. It has become a strategic business priority for cement manufacturers. Rising fuel costs, stricter environmental regulations, and growing pressure to reduce dependence on conventional fuels are accelerating AFR adoption across the industry. However, the success of an AFR project depends heavily on how effectively waste is processed before it reaches the kiln. Poor preprocessing can negatively impact kiln performance, fuel efficiency, and emission control systems. Inconsistent fuel
quality often forces operators to make frequent adjustments, reducing throughput and increasing energy consumption.”
Dr Kapil Kukreja, General Manager, NCCBM, says, “Variations in composition, particle size, and calorific value can lead to inconsistent combustion behaviour resulting in fluctuating heat release patterns. These fluctuations can affect process stability, temperature control and clinker quality. Additionally, incomplete combustion of RDF particles can result in increased emissions, higher unburnt carbon content, and operational difficulties within the calciner system. Higher ash and inert content of RDF can dilute the clinker quality and reduce calciner efficiency.”
Meanwhile, digital twins are allowing manufacturers to simulate entire production processes, optimise kiln performance, evaluate process changes virtually, and reduce operational risks before implementation. Automated Laboratory Information Management Systems (LIMS), coupled with online and offline XRF and XRD analysers, are delivering real-time monitoring of clinker chemistry and mineralogy, ensuring tighter quality control, lower clinker variability and more consistent cement performance.
Dr Prateek Sharma, Group Project Manager, NCCBM, explains, “Chlorides and alkalis present in RDF can lead to excess buildup and blockages in the kiln and calciner increasing the downtime of cement plants. Hence, issues with direct utilisation of RDF establishes the need for fuel conditioning and alternative utilisation approaches that can maximise the energy potential of RDF while minimising adverse impacts on plant operation. RDF gasification emerges as an efficient tool for converting solid RDF into syngas which can be used as a fuel with improved characteristics.”
Digitalisation and intelligent manufacturing will be among the most critical enablers of achieving the cement industry’s net-zero ambitions by improving operational efficiency while simultaneously reducing energy consumption and greenhouse gas emissions, confirms a GCCA report.

From research to reality
While the cement industry has made remarkable progress in developing breakthrough technologies, the transition from laboratory research to large-scale commercial deployment remains one of its greatest challenges. The successful adoption of innovations such as LC3), CCUS, advanced alternative fuels, green hydrogen and novel SCMs depend not only on technical feasibility but also on economic viability, regulatory support, raw material availability, and market acceptance.
Veerendra Jamdade, CEO and Founder, Vritti Solutions, states, “The cement industry has a market that is constantly in flux, due to factors such as infrastructure investment, seasonality of demand, fuel costs, building activity by region and general economic cycles; therefore, having accurate forecasts is very important in this type of market. Traditional ERP systems are primarily data repositories with limited analytic functionality; thus, they capture transactional and operational information but generally lack advanced analytical capabilities for converting captured data into actionable information. This
affects everything from demand forecasting and inventory planning through procurement and production scheduling.”
According to IEA, technologies that are still at the demonstration or early commercial stage-including CCUS and next-generation low-carbon binders-are expected to contribute nearly 40 per cent of the emissions reductions required for the global cement sector to achieve net-zero emissions by 2050, underscoring the importance of accelerating their scale-up. This requires robust R&D ecosystems, stronger collaboration between cement manufacturers, research institutions, technology providers,
equipment suppliers, and policymakers, as well as supportive standards and financial incentives to reduce investment risks.
Ashutosh Pandita, Director – Head, Cement Business, TKIL Industries, elaborates, “The cement industry’s most transformative innovation today is the increased use of alternative fuels and raw materials (AFR), supported by advanced feeding systems and process technologies that are driving both operational efficiency and decarbonisation. Looking ahead, oxyfuel combustion and carbon capture technologies remain underappreciated but hold immense potential for enabling deep reductions in carbon emissions and accelerating the industry’s journey towards net-zero production. By 2030, cement manufacturing is expected to become significantly more sustainable, energy-efficient, and technology-driven, with widespread adoption of AFR, low-clinker cement technologies, greater digitalisation and automation, and the early commercial deployment of carbon capture solutions, all supported by stronger industry collaboration and a shared commitment to achieving long-term sustainability goals.”
In India, organisations such as the National Council for Cement and Building Materials (NCCBM), leading academic institutions, and major cement companies are working together to develop and validate emerging technologies, while the introduction of standards such as IS 18189:2023 for Limestone Calcined Clay Cement (LC3) marks a significant step towards commercial adoption. However, challenges such as high capital investment, long validation cycles, limited infrastructure for technologies like CCUS, fluctuating availability of alternative raw materials, and customer acceptance continue to slow implementation. Bridging the gap between research and commercial reality will therefore require sustained investment in innovation, knowledge-sharing, pilot projects, policy support, and industry-wide collaboration to ensure that promising technologies evolve into scalable, economically viable solutions capable of transforming the future of cement manufacturing.

Creating a green future
Clinker production will increasingly rely on low-carbon technologies such as LC3, high-volume SCMs, AFR, renewable energy, waste heat recovery, and eventually CCUS, enabling manufacturers to significantly reduce their environmental footprint.
Achieving net-zero concrete by 2050 will require a combination of clinker substitution (around 37 per cent of cumulative CO2 reductions), carbon capture technologies (approximately 36 per cent), and improvements in thermal efficiency, renewable energy, and circular economy practices.
Industry Expert SA Khadilkar comments, “Customer requirements are a key driver of innovation in the cement industry, influencing product development, process improvements, sustainability initiatives, and digital solutions. Innovation is most effective when it addresses real market needs, particularly in areas such as performance, durability, and application-specific requirements. Around a decade ago, ACC and Ambuja Cements (now Adani Cement) recognised this shift and introduced performance-oriented blended cement brands with enhanced durability, reduced water penetration, and OPC-like properties. Their success encouraged other major cement manufacturers to develop specialised cement brands with unique performance characteristics, demonstrating how product innovation has evolved to meet changing customer expectations.”
“Ultimately, customer expectations have transformed innovation from a technology-driven exercise into a market-driven strategy, ensuring that new developments create measurable value across the construction value chain,” he adds.
India is expected to add nearly 500 million square metres of urban built-up area by 2030, driving sustained demand for greener, more durable, and higher-performing construction materials, according to NITI Aayog. Meeting this demand will require cement manufacturers to evolve from commodity producers into integrated providers of sustainable building solutions, supported by data-driven manufacturing, collaborative R&D, customer-centric product innovation, and circular resource management. The cement plant of tomorrow will therefore be defined not only by its production capacity but also by its ability to manufacture smarter, cleaner, and more sustainable construction materials that support India’s ambitious infrastructure and climate goals.

Conclusion
The path ahead is clear in its direction, if not yet in its pace. India’s position as the world’s second-largest cement producer, combined with its infrastructure ambitions and its 2070 net-zero commitment, makes this transition both urgent
and consequential.
What this article has made evident is that no single technology will carry the industry to net zero. LC3 addresses clinker dependency. Digital manufacturing addresses efficiency and waste. Alternative fuels address fossil fuel dependence. CCUS addresses the residual process emissions that no other lever can reach. Each is necessary. None is sufficient alone. The industry’s task is to advance all of them simultaneously, at a pace that matches the scale of the challenge.
The plants that will build tomorrow’s highways, airports and homes will need to do so with a fraction of today’s carbon footprint.

Innovations in cement and concrete

  1. Carbon mineralisation in concrete: A 2026 peer-reviewed study in the Journal of the American Ceramic Society by MIT’s Masic Lab and CarbonCure Technologies used in-situ Raman microspectroscopy to show that CO2 injected during cement mixing triggers a three-stage hydration sequence, producing a more uniform microstructure with approximately 13 per cent higher early strength while permanently sequestering carbon within the concrete matrix.

Source: www.carboncure.com

  1. Zero-clinker geopolymer blocks: Theseus Development manufactures geopolymer blocks using upcycled aluminosilicate waste from quarries and mines through an inorganic polymerisation process, achieving up to 80 per cent lower embodied carbon compared to conventional cement blocks. An interlocking block design reduces mortar requirements, lowering construction costs while eliminating clinker entirely from the production process.

Source: www.rmi.org

  1. 3D-printed basalt fibre grids: Austrian startup Fiber Elements, founded in 2023, uses robotically wound continuous basalt fibres arranged into three-dimensional reinforcement grids that replace steel in concrete structures. The resulting composites are three times stronger than steel, weigh two-thirds less, resist corrosion entirely and reduce CO2 emissions by up to 70 per cent compared to conventional steel-reinforced concrete.

Source: www.eitmanufacturing.eu

  1. Self-healing concrete: Dutch company Basilisk leads commercial deployment of bacteria-based self-healing concrete, with licensed production now active in Japan and a highway viaduct pilot planned for 2026. Dormant Bacillus bacteria embedded in the mix activate upon crack formation, metabolising nutrients to precipitate calcium carbonate that autonomously seals fractures. The global self-healing concrete market is projected to grow significantly through 2031, driven by green building mandates and infrastructure agencies targeting lower maintenance costs and extended structural life.

Sources: www.thelegaljournalontechnology.com and www.mordorintelligence.com

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