Concrete
Achieving Sustainability with LD Steel Slag
Published
4 years agoon
By
admin
The utilisation of Linz-Donawitz (LD) steel slag is a firm step towards achieving sustainability and players of the Indian cement industry need to focus on this to make a positive impact on the environment. Dr Asok K Dikshit, Dr Sanjeev Chaturvedi and Kirti Chugh from National Council for Cement and Building Materials (NCCBM) present a detailed study.
Slag is a by-product generated during the manufacturing of pig iron and steel. This is a solid industrial by-product of the iron and steel industry and mainly these wastes include blast furnace and steel melting slag. It can be categorised as carbon steel slag and stainless steel slag according to the type of steel, and as pre-treatment slag, Linz-Donawitz (LD) converter slag, electrical arc furnace slag (EAFS), ladle refining slag, and casting residue according to the steelmaking process. LD slag is generated by the Linz- Donawitz process from steel making process or pig iron refining process in oxygen converters [1-2]. One of the important wastes in all integrated steel plants is LD converter steelmaking slag. Worldwide generation of LD slag waste is about 47 MT per annum [3] and in India, the total generation rate of LD slag waste is (150-180) kg/t of crude steel [4] whereas, in SAIL, the generation per annum is 1.28 MT [5]. Steel melting slag generation is about 4 to 4.5 MT per annum. The amount of LD slag produced in Indian integrated steel plants is about 200 kg/t of hot metal. Out of this 70-100 per cent is being reused in other countries whereas only 25 per cent is being reused in India [6]. It has been observed that for the road project, for sintering and iron-making recycling in steel making plants, 50 per cent of slag has been used.
The generation of LD slag increases due to the rapid growth of industrialisation, the land available for disposal of large quantities of LD slag at a landfill site is deteriorating and disposal cost is increasing. Nowadays, the vital environmental topics are the issues on both the global warming effect and natural resource-saving. The significant source of pollution of air, water, and soil are land filled with waste materials, and hence human health, the growth of plants and vegetation, etc are adversely affected. From the viewpoint of conservation and protection of the global environment, steel slag recycling has attracted the attention of many scientists in recent years. Therefore, improving the utilisation rate of steel LD slag is an imperative way for the steel enterprise to realise sustainable development.

This by-product LD slag generated by Tata Steel BSL at present generates about 1 million tonnes of slag per annum. Tata Steel exports 9,000 tonnes of LD slag to the Bangladesh market through Dhamra Port Company Odisha state in 2021. As part of the quest for a sustainable future in the Cement Industry, LD slag is facing innovations by creating value out of its by-products. In collaboration with its cement industry, for applications in slag cement PSC, clinker making, and GGBS (Ground Granulated Blast Furnace Slag), (0-6) mm size slag range has been developed by steel major. LD slag is being supplied by Tata Steel BSL (as part of its sustainable operations of by-products) to brick makers near the plant for hard surfacing national highway work, and low land area filling, besides to cement companies also.
Basics of steel production and types of steel slag
Electric arc furnaces (EAF) or in basic oxygen processes for steel production are being used in all steel integrated. Molten metal and dolomitic lime (CaO.MgO) or fluxes lime (CaO) is placed in the furnace in the basic oxygen and EAF processes. In the furnace, high-pressure oxygen is injected with a lance. Several oxidised compounds are formed when oxygen reacts with carbon and non-iron impurities. Slag is formed when these compounds react with the lime or dolomitic lime. The slag remains while liquid steel is poured from the furnace which is then poured into a separate vessel. In the steel-making process, different types of slag produced are furnace or tap slag, synthetic or ladle slags, raker slag. Fig. 1 shows the production of different slag in the general flow in a modern steel plant. The nonmetallic products from the furnace, raker and ladle slags are used for different applications including as construction aggregate, in agriculture, or reclamation of acidic lands following processing and metal recovery [7].
Fig 2 shows the flow process during steel production operation and generation of by-product slag. BOFS is produced in the steelmaking process by using the molten iron coming from the BF. The slag contains various heavy metal carriers such as chrome, lead, or zinc that produce various types of slag.


The macrograph about structural morphology is shown in Fig.3. Particles of various sizes are agglomerated.
Physical, chemical and mineralogical characteristics of LD steel slag
It was found that the LD slag density lies between 3.3-3.6g/cm.3 Due to high Fe content in slag, steel slag looks like a loose collection in appearance, and appears hard and wear resistant. The grindability index of steel slag is 0.7, in comparison with the value of 0.96 and 1.0 for blast furnace slag and standard sand respectively. SiO2, CaO, Fe2O3, FeO, Al2O3, MgO, MnO, P2O5 are major constituents of LD slag . The main mineral phases in steel slag are dicalcium silicate (C2S), tricalcium silicate (C3S), RO phase (CaO-FeO-MnO-MgO solid solution), tetra-calcium aluminoferrite (C4AF), olivine, merwinite and free-CaO [8]. The reuse and recycle of the steel slag is closely related to the slag’s chemical and physical characteristics. For chemical and mineralogical characteristics of LD slag, many studies were done. ICP-AES and C-H-N-S analyser were used for chemical characterisation of LD slags. CaO, Fe, SiO2 and Mn are the main desirable substances [9].

Table 1 summarises the major phases and chemical composition of steel slag generated at integrated steel plant in India [10].
Application of LD slag in cement industry and brick production
(a) Cement clinker using LD lag
The transformation of pig iron into liquid steel generates a significant quantity of LD slag in the steel-making process. The possibility of adding LD slag in the raw meal for the production of Portland clinker replacing iron ore. 0.6 mass per cent iron ore and 1.0, 2.0, and 3 mass per cent of iron ore being replaced by LD slag. The various components of LD slag were prepared in the different raw mixes in the laboratory and fired in a high-temperature muffle furnace at 1400°C, all raw mix samples were sintered. The ethylene glycol method is used to determine free lime to assess the comparative burnability of the raw mix samples. X-ray and X-ray fluorescence were employed to determine the chemical and mineralogical composition of the clinkers which showed that the mineralogical composition of the clinker was not altered on the addition of LD slag in the raw mix. The fluxing agent was the iron present in the LD slag and it replaced the iron ore requirement. Improvement in burnability and development of clinker mineral phases was shown by reduction in free lime and increase in C3S phase value with LD slag as shown in Fig 4. Under the optical microscope, homogeneously distributed and well-developed alite and belite phases were observed. A plant trial with 2 mass per cent LD slag as a raw mix component replacing iron ore was conducted, but no adverse impact in the pyro-processing system was observed, and operation of the kiln was found to be smooth and stable during the trial [11].
(b) Cement replacement with LD slag

A study on partial replacement of cement with LD slag was done and its impact on the mechanical, microstructural, and durability properties of concrete were studied. Grindability is of major importance in the manufacture of slag blended cement. In terms of grindability, the incorporation of LD slag with particle size below 5mm can benefit the grinding of OPC clinker. Other particle size materials should be used for other applications in road bases etc. The addition of LD slag, at content levels of up to 20 per cent of total solid material, is suggested as optimum for the stability, economy, and strength of the blended cements as shown in Fig 5. Steel slag contains a similar mineral composition to that of OPC clinker; the slag may become unstable due to excess free lime (f-CaO). GBFS possesses hydraulic properties that can only be activated in the presence of an existing basic or sulfate activator such as CaO or CaS. This excess CaO steel slag could constitute
this activator.
(c) LD slag in brick production

LD steel slag is used in commercial brick manufacturing as shown in Fig.6. The characterisation results of LD slag showed that the pH and electrical conductivity of the samples were very high indicating high percentage of lime presence and presence of ionic form of various salts, respectively. The specific gravity and bulk density of LD slag samples were found to be high in comparison to fly ash samples. The major elemental compositions of LD slag samples are shown by weight Ca and oxygen. The CaO, FeO and SiO2 are the major components in the LD slag. The compressive strength was found to be more than 100 kg/cm2 for brick samples type A as shown in Fig 6 (Fly ash – 35 per cent + LD slag – 30 per cent + Gypsum – 5 per cent + Quarry dust – 20 per cent + Lime – 9.75 per cent + CaCl2 – 0.25 per cent) after 14 days of curing which is greater than 50-70 kg/cm2, i.e., strength of normal red clay bricks and maybe it is a feasible replacement for commercial purposes in civil jobs.
Summary
The steel industry is nowadays focused to increase the way for recycling slags generated during steel production. The pressure for saving energy and natural resources has led the steel industry to improve and increase the recycling of steel slag since its use as landfill material has almost reached its limit. Steel slag in most cases, the valorisation, and use of these by-products prevent landfill, reduce energy consumption, reduce CO2 emissions and help preserve natural resources. To neutralise soil acidity in agricultural soils for many years, LD slag has been successfully used as a substitute for limestone, and slag use is comparable to or superior to limestone in some cases. In addition to its limiting benefits, slag contains Si which has been shown to increase yields of crops, like rice and sugarcane, and Si is also helpful in defending crops against crop diseases. Slag also contains plant nutrients that can enhance plant growth. Considerable cost advantages are offered by steel slag over commercial limestone. In recent years, significant volatility in the cost of agricultural limestone is attributable in part to energy costs of production. To cover the rising costs of fertiliser, limestone use has been deferred by Cultivators, even at the risk of lower yields. The application of LD slag as a cementitious component instead of aggregate in concrete would boost its reuse and will reduce the cost of construction and production of greenhouse gases significantly. The main constraint with the usability of LD slag is the high amount of free MgO and free CaO content, which leads to volumetric changes. At the same time, owing to calcined materials present in LD slag, its potential to be used as a partial substitution of OPC Granulated slag is used for the manufacture of hydraulic cement by mixing Portland cement clinker, gypsum, and granulated slag in suitable proportions and grinding the mixture to get a thorough and intimate mix between the constituents. There is IS code for GBFS, i.e., IS 12089:1987 but for LD slag utilisation in the construction industry for infrastructure development is in the interfacial stage, more research work is required for innovative solutions for its utilisation.
Acknowledgment
The authors are thankful to DPIIT, Ministry of Commerce and Industry (MoC&I), Government of India for supporting R&D funding to NCCBM in the favour of a circular economy.
References
- Alexandre, J., and Boudonnet, J.Y., Les laitiers d’aciérie LD et leurs utilisations routières. Laitier sidérurgiques., 75: 57–62 (1993).
- Shen, D. H., Wu, C. M., and Du, J. C., Laboratory investigation of basic oxygen furnace slag for substitution of aggregate in porous asphalt mixture. Constr Build Mater., 23: 453–61 (2009).
- Takano, Cyro et al., Recycling of Solid Waste From Integrated Steel Plant: A Sustainable Alternative. Materials Transactions., 42: 2560-2570 (2001).
- Yadav, U. S., Das, B. K., Kumar, A., and Sandhu, H. S., Solid waste recycling through sinter status at Tata Steel. In: Proceeding of Environment and Waste Management, NML, Jamshedpur, India, pp: 81-94 (2002).
- Basu, P., Alternative ironmaking technologies: an environmental impact analysis. In: Proceeding of Environment and Waste Management, NML, Jamshedpur, India, pp: 194-202 (2002).
- Umadevi, T., Rao, S. P., Roy, Pankaj., Mohapatra, P.C., Prabhu, M., and Ranjan, M., Influence of LD slag on iron ore sinter properties and productivity. In: 6th international seminar on mineral processing technology, NML, Jamshedpur, pp: 747-757 (2010).
- www.nationalslag.org
- Kourounis, S., Tsivilis, S., Tsakiridis, P.E. Papadimitriou, G. D., and Tsibouki, Z., Properties and hydration of blended cements with steelmaking slag. Cement Concrete Res., 37: 815-822 (2007).
- Waligora, J., Bulteel, D., Degrugilliers, P., Damidot, D., Potdevin, J. L., and Measson, M., Chemical and mineralogical characterisations of LD converter steel slag: A multi-analytical techniques approach. Mater Charact., 61: 39-48 (2010)
- Chand, S., Paul, B., & Kumar, M. (2015). An overview of use of Linz-Donawitz (LD) steel slag in agriculture. Current World Environment, 10(3), 975.
- Singh, A. K., Kukreti, N. C., Chandraker, V., Baury, M., Biswas, T., & Patil, K. D. (2015). Utilization of LD Slag for the production of Portland cement clinker. Cement International, 3, 70-76.

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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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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
- 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
- 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
- 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
- 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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