Concrete
Innovative AFR
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Asok Kr. Dikshit, Richa Mazumder, Sanjeev Kr. Chaturvedi and Lok Pratap Singh, National Council for Cement and Building Materials (NCB), discuss the themes of sustainable development in India’s cement sector, in the concluding section of a three-part series.
Studies carried out in NCB in the area of raw material substitution are discussed below:
I. Investigation for Standardisation of High Magnesia (MgO) Clinker for the Manufacture of PPC and PSC Blended Cement
The objective of this study was to investigate the performance of PPC and PSC cements prepared from high magnesia clinker to utilise high MgO bearing low grade limestone for the manufacturing of Portland clinker resulting in preservation of natural resources and sustainable development. Four types of high MgO clinker samples containing MgO as high as upto 8.4 per cent from different cement plants were procured along with other cementitious and additive samples such as fly ash, GBF slag and gypsum for the manufacture of OPC, PPC and PSC. These cement samples were prepared by intergrinding the constituents in a laboratory ball mill keeping the fineness level 350±10 m2/kg. The results of investigation revealed that addition of fly ash and granulated blast furnace slag (GBFS) in the blended cements prepared from high MgO clinker samples were found to have potential effect on arresting the expansion caused by periclase (MgO). The minimum fly ash content was optimised to be 25 per cent by weight in case of PPC and the minimum slag content was optimised to be 35 per cent in case PSC while utilising high MgO clinker for the manufacture of blended cement. The performance results obtained so far are quite encouraging. Use of high magnesia (MgO) clinker for the manufacturing of the PPC and PSC will pave the way for utilisation of high MgO content low grade limestone containing high MgO resulting in increased mine life besides improved sustainability in cement manufacture.
II. Manufacture of Synthetic Gypsum from Marble Slurry for Subsequent use in
Cement Production
The generation of waste marble slurry in India is in the range of 5 to 6 million tonnes per annum. The heaps of this waste material occupy large land areas and remain scattered all around at the marble processing unit, affecting the environment, eco-system and health of the people in the area. The chemical composition of marble slurry indicates predominance of calcium carbonate which is a suitable raw material for various industrial applications. One of its possible areas of utilisation is its conversion into gypsum that can be used as set controller in cement industry. Marble slurry samples were collected from clusters at Kishangarh, Makrana, Rajsamand and Udaipur in Rajasthan and characterised for their physical and chemico-mineralogical properties. Samples of synthetic gypsum with well grown crystalline phases were prepared in the laboratory by inducing chemical reaction using sulphuric acid and marble slurry. The amount of sulphuric acid to be consumed in its complete reaction with marble slurry was found to be dependent on the composition of the marble slurry especially on CaO and MgO content. The physical characteristics like specific gravity and whiteness index of the laboratory prepared gypsum samples were found to be more or less comparable to mineral gypsum. The percentage purity of different synthetic gypsum samples prepared were 87.91, 89.55, 86.02 and 88.26 per cent.

III. Production of Synthetic Slag from Low Grade Limestone
For development of Synthetic Slag using low-grade limestone, a study was carried out at NCB laboratory. In this study laboratory slag samples prepared with low-grade limestones and other additive materials, which found to be conforming the IS: 12089-1987. These laboratories made synthetic slag samples as shown in Fig 9. were also investigated by optical microscopy as shown in Fig 10. They found to have maximum 92 per cent glass content, which is greater than 85 per cent as specified in IS-12089. PSC samples were prepared with 40 and 60 per cent synthetic slag replacing equal quantity of clinker. The performance of PSC blends prepared using synthetic slag sample equal quantity of clinker. The performance of PSC blends prepared using synthetic slag sample were found as per requirements of Indian Standard Specification, IS: 455-1989 for PSC. As the limestone, which is getting depleted and has reached to an alarming level where the availability of cement grade limestone in India has reduced to 8949 million tonnes only, Synthetic Slag may play a vital role to replace clinker or indirectly cement grade limestone. However, the main challenge would be to produce synthetic slag at industrial scale.

Clinker substitution
A very effective strategy towards resource management and reduce CO2 emissions is to substitute some of the Portland cement clinker with other materials. These are known variously as mineral additions or supplementary cementitious materials (SCMs), and also include almost inert materials, which may also be called fillers. Clinker can be blended with a range of alternative materials, including pozzolans, finely ground limestone and waste materials or industrial by-products. The most common clinker substitutes are reactive by-products from other industries: granulated blast furnace slag (GBFS),a by-product of pig-iron production in blast furnaces, and fly ash (FA), generated by burning coal to produce electricity.
The clinker-to-cement ratio (percentage of clinker compared to other non-clinker components) has an impact on the properties of cement so standards determine the type and proportion of alternative main constituents that can be used. To ensure the future use of other constituents, the cement industry is dependent on the local supply of these materials. The use of other constituents in cement and the reduction of the clinker-to-cement ratio means lower emissions and lower energy use. Other materials that can be used: Natural pozzolans, such as clays, shale and certain types of sedimentary rocks., Limestone (finely ground), which can be added to clinker (without being heated and transformed into lime), Silica fume, a pozzolanic material and a by-product in the production of silicon or ferrosilicon alloys, Granulated blast furnace slag (GBFS), Fly ash etc.
Apart from these NCB also worked on several projects like Portland Limestone Cement, Composite cement, Portland Dolomitic Cement etc. NCB in one of its projects has successfully utilised up to 15 per cent dolomite as an additive replacing equal quantity of clinker. The cement performance was found to be similar to that of control cement prepared without dolomite.
Similarly, NCB has carried out several studies on composite cement wherein combinations of fly ash and granulated blast furnace slag were used for preparing composite cement blends. BIS has brought out standard specification IS: 16415-2015 for composite cement on recommendations of NCB.
Development of Portland Composite Cement (Fly ash/Slag and Limestone based), Development of Portland Limestone Cement (PLC), utilisation of low grade limestone and mines rejects, Utilisation of Construction and demolished waste (C&D) waste based aggregates in concrete structures and pavements are some of the key areas, where Indian Cement Industry and NCB is working together towards natural resource management and promoting circular economy which are the key themes towards sustainable development in cement sector. Some of the work that has been carried out in NCB discussed below:
I. Investigations on Development of Portland Composite Cements based on Fly Ash and Limestone
Portland composite cement blends were prepared (80 nos.) with four types of clinker from different regions of India along with the regional available Fly ash and limestone. The materials were ground in a laboratory ball mill with a capacity of about 8 kg by inter-grinding method. The clinker inter-ground with 3.7 per cent of gypsum by mass is referred to as OPC. A series of tests was carried out on various mixes of limestone-fly ash cement mortars in order to investigate the effects of using different percentages of lime and fly ash as a replacement of cement on the compressive strength of such mortars at various ages. Different mix proportions were adopted for the experimental work. Clinker quality plays an important role on performance of limestone and fly ash based composite cements. PCC samples containing Fly ash and Limestone up to the level off 30 per cent and 7 per cent respectively comply with IS 16415-2015 at all ages. Lower levels of limestone additions show higher percentage of difference between IS requirements and obtained results. Whereas 10 per cent replacement shows marginal difference between IS requirements and obtained results. PCC samples of 5 per cent replacement of Flyash with Limestone comply performance with respective PPC samples at all ages.

II. Investigations on Portland Limestone Cement
European Standard EN-197-1 permits the use of maximum 35 per cent limestone in the manufacture of Portland Limestone Cement. Presently, in India, there is no standard on Portland Limestone Cement. The main objective of the study is to investigate the feasibility of using different grades of limestone in development of Portland Limestone Cement in order to formulate new Indian standard for its commercialisation along with lowering in clinker factor in cement for environmental sustainability. To carry out the study, different Portland Limestone Cement blends were prepared by inter-grinding of 10, 20 and 30 wt. per cent cement grade of limestone, dolomitic limestone and low grade limestone with OPC clinker and gypsum. The cement blends were designated as PLC-A, PLC-B and PLC-C corresponding to cement grade limestone, dolomitic limestone and low grade limestone. The trend of compressive strength development showed marginal reduction in strength development with increasing dosages of limestone in cement mix. However, increase in the early strength has observed with addition of low quality of limestone that may be attributed to the formation of monocarboaluminate phase.
Alternative Binders
The idea of alternative binders/novel cements is to introduce different raw materials in clinker and cement manufacturing processes without compromising the efficiency and quality of cement that will emit less CO2 and utilise less energy. Below is a detailed description of potential alternative binders/novel cements.
A. Alkali-Activated Cements: Alkali-activated cements belong to family of hydraulic cements that are characterised by a high content of aluminosilicates bonding phase. Aluminosilicates are not reactive with water, or their reaction is too slow. However, due to their high amorphous content, they hydrolyse and condense when placed in alkaline medium, forming 3-D polymeric structures that have load-bearing ability (Habert et al. 2014). In cements, the natural alkalinity of the system and portlandite fulfill these reactions, while in the absence of Portland cement, a strong base is needed to activate the amorphous aluminosilicates (Habert et al. 2014). Based upon the composition of cementitious components, alkali-activated cements are classified into five major categories (Shi et al. 2018)
I. Alkali-activated slag-based cements
II. Alkali-activated pozzolan cements
III. Alkali-activated lime-pozzolan/slag cements
IV. Alkali-activated calcium aluminate blended cements
V. Alkali-activated Portland blended cements
In NCB a study on Investigation on Development of Geopolymeric Cements has been carried out and discussed in detail below:
I. Development of Geopolymeric Cements
Investigation on formation and properties of geopolymeric cements based on alkali investigation of low lime coarser flyash have being taken up. The alkali treated flyash sample were subjected to initial thermal curing at two different temperatures upto 90° C for varying retention periods. SEM studies indicated the formation of geopolymers.

The performance of geopolymeric cement was found to be influenced by initial thermal curing conditions and therefore need optimisation. Investigations have also been carried out for preparation of cementitious binders at 27°C temperature using rationalised curing conditions by alkali activation of blends of fly ash with granulated blast furnace slag (GBFS) having 94 percent glass content. Studies indicated that ratio of fly ash and GGBFS in the blend affects the compressive strength property. The blend ratio as well as water content at fixed range of Na2O required to be optimised to obtain better compressive strength property. SEM image of alkali activated fly ash – GGBFS system cured for 28 days indicated formation of CSH gel along with NASH in this system resulting in development of compressive strength at 27°C
B. Belite-Rich Portland Cement: Belite-rich Portland clinkers are produced with the same process as ordinary Portland cement clinkers, but with less limestone in the clinker raw material mix, as well as lower clinkering temperatures so CO2 generation is reduced. The concept of belite-rich Portland cement is not new, but it takes advantage of the fact that modern OPCs have very high alite (C3S) contents. Market demand for rapid concrete hardening has driven cement manufacturers towards higher and higher alite contents, at the expense of higher
GHG emissions.
Belite-rich Portland cement belong to the same family as ordinary Portland cement in terms of clinker mineralogy, i.e., they are in the C2S-C3S-C3A-C4AF system. They are also commonly known as high belite cements (HBC). The difference in clinker composition lies mainly in the belite/alite ratio. For HBC the belite content is generally more than 40 per cent and alite normally less than 35 per cent, making belite the most abundant phase, as opposed to alite.
It has been established by various researches that belite-rich Portland cement typically exhibit similar setting times, lower water demands, lower heat evolution and early strength gain but
higher later age strength, and lower drying shrinkage compared with OPC. It has also shown better resistance to sulfates and chlorides, mainly due to the smaller proportion of portlandite in the hydration products.
It typically attains similar 28-day strengths to OPCs, and gain additional strength more rapidly than OPCs at later ages (Gartner et al. 2016).
A key reason they are not currently widely used is that they gain strength much more slowly than most OPCs. Such cements are well suited for niche markets where the strength gain after a few days is not critical. They are mainly employed for reasons of their low heat of hydration in the construction of massive concrete dams and foundations.
C. Calcium Sulfoaluminate (CSA) Cement: Calcium sulfoaluminate (CSA) cements are types of cements that contain high alumina content. To produce CSA clinker, bauxite, limestone, and gypsum are mixed together in a rotary kiln (Phair et al. 2006). By utilising CSA compositions, limestone quantity is reduced in the kiln that not only benefits in reduced thermal energy (up to 25 per cent) but also decreased CO2 emissions (up to 20 per cent) compared to the Portland cement. Industrial waste materials can also be used as raw materials for manufacturing CSA cements and thus calcium sulfoaluminate cements have significant environmental advantages.
It has the characteristics of early strength, high strength, high impermeability, high frost resistance, corrosion resistance, low alkali and low production energy consumption. They are widely used in rapid construction, rapid repair, winter construction, marine environments and underground engineering (Wang et al. 1999, Coppola et al. 2018). Its clinker is mainly composed of C4A3S (ye’elimite, 3CaO•3Al2O3•CaSO4) and ß-C2S (belite, 2CaO•SiO2). Among them, C4A3S is an early strength mineral that can quickly hydrate to AFt (ettringite, 3CaO•Al2O3•3CaSO4•32H2O) in the presence of gypsum to provide early strength (Hargis et al. 2013). Compared with C3S (alite, 3CaO•SiO2), the main mineral component of Portland cement, the formation temperature of C4A3S and the content of CaO are lower (Ali et al. 1994). Advantages of using CSA is that it not only saves a great deal of coal, power and limestone resources thus help in natural resource management but also reduces GHG emissions. However, it has many disadvantages also, such as the low percentage and slow hydration of C2S, resulting in no significant increase in the later strength of CSA and the formation of C4A3S, (ye’elimite) requires a large amount of natural gypsum and high-quality aluminium resources (Su et al. 2019).
Alternative fuels
Alternative Fuel (AF) becomes more popular to the cement manufacturer due to increasing fossil fuel prices, limited fossil fuel resources and environmental concerns. Generally fossil fuels such as coal, petroleum coke (petcoke) and natural gas provide the thermal energy required for cement industry. Usage of AF cover all non-fossil fuels and waste from other industries including tire-derived fuels, biomass residues, sewage sludge and different commercial wastes (Nielsen et al. 2011). These alternative fuels not only reduce CO2 emissions but also contribute to waste management and promote circular economy principles. Additionally, advancements in technology and improved combustion processes have made the use of alternative fuels more efficient and cost-effective.
The use of alternative fuels in cement manufacturing not only promotes circular economy but also helps in natural resource management. It is also one of the effective methods of achieving lower production costs. The process of clinker production in kiln systems creates favourable conditions for use of alternative fuels which include: high temperatures, long residence times, an oxidising atmosphere, alkaline environment, ash retention in clinker, and high thermal inertia. These conditions make certain that the fuel’s organic part is destroyed and the inorganic part, including heavy metals is trapped and combined in the product.
The cement manufacturers are consuming all possible Alternative fuels like refuse-derived fuel (RDF), industrial plastic, biomass, tyre chips, waste generated by pharmaceutical industry, Paint industry, Agro industry, Paper industry, chemical industry etc. (Mohapatra et al. 2014; Shaw et al. 2017). It is proposed to use either solar energy or hydrogen gas to mitigate for future energy demand in cement plants. India also has plan to emerge as a global electrolysers manufacturing hub to meet domestic demand and to emerge as a leading electrolyser exporter in future.
Conclusion
NCB’s current Research areas are well aligned to national priorities and requirement of society at large and include research in the area of low carbon and multi component blended cements, alternative binders and cementitious materials, alternate fuels and raw materials, productivity and environment improvement in cement industry etc. The research outcomes from these projects will provide Indian cement, building materials and construction industry a technologically sound platform to further reduce CO2 emissions, energy consumption and resource and environment conservation, higher thermal substitution rates etc. to achieve sustainability and cost optimisation taking due care of national and international commitments. The Research and Innovation projects of NCB are well aligned with the vision and mission of Government of India like decarbonisation, implementation of circular economy, increased sustainability etc.
Acknowledgment
*The Authors wish to acknowledge the Director General of National Council for Cement and Building Materials (NCB) for giving permission for publication and DPIIT, Ministry of Commerce and Industry, GOI, through various R&D projects supporting financial support for sustainable development of cement Industry. The Authors also acknowledge all scientific and technical staff of NCB for cooperation through R&D work for sustainability of cement
industry related projects.
Conflict of interest: The authors have no conflicts of interest, financially and ethically, to publish in this review work.
For a full list of references, visit www.indiancementreview.com.
Concrete
Cement Makers’ Margins To Fall Rs 50-75 Per Tonne Amid West Asia Conflict
Crisil Sees Margins Easing Despite Steady Demand
Published
3 weeks agoon
July 29, 2026By
admin
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.
Concrete
UltraTech Board Approves Rs 50 bn Fundraise Via NCDs
Company to issue half a million debentures for expansion plan
Published
3 weeks agoon
July 28, 2026By
admin
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.
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
The Road Ahead Begins Here
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