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Decarbonisation of the Indian Cement Industry

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As India commits to net zero target for Year 2070, decarbonisation of the Indian cement industry is mandatory.

As India commits to net zero target for Year 2070, decarbonisation of the Indian cement industry is mandatory. With decreasing CO2 emissions in 2021, the goal of reduction in carbon intensity looks promising, provided proactive steps are taken and implemented, shares Dr. BN Mohapatra, Director General of National Council for Cement and Building Materials (NCCBM).

Honourable Prime Minister of India Shri Narendra Modi has made a pledge to cut the CO2 emissions in the recently concluded COP26 summit at Glasgow in November 2021and for the first time, he has set a Net Zero target for India by the year 2070. The US and EU have aimed to hit net zero by 2050, while China has announced plans for carbon neutrality by 2060. Earlier, India under the Intended Nationally Determined Contribution (INDC) submitted to the UN Framework Convention on Climate Change (UNFCCC) Conference of the Parties (COP21) in Paris in December 2015, committed to reduce the emissions intensity of its GDP by 33 to 35 per cent by 2030 from 2005 level and to achieve 40 per cent of installed power capacity from non-fossil fuels by 2030. In November 2021, India has already reached an emission reduction of 28 per cent and has met the 40 per cent target of non-fossil fuel-based installed power capacity as per the commitment in COP21.

Globally, the cement sector generates about 7 per cent of the total anthropogenic emissions. In hard-to-abate sectors like cement, steel, chemicals, etc, it is technologically very difficult to reduce the process related to Greenhouse Gases (GHG). The Indian cement industry has been working on the issue of its GHG emissions and has brought down the CO2 emission factor from 1.12 t of CO2/t of cement in 1996 to 0.670 t of CO2/t of cement in 2017. The proactive steps taken by Indian cement industry has contributed to achieve the goal of reduction in carbon intensity. Further, to achieve the target of net zero, decarbonisation of the Indian cement industry is required.

Recently, in October 2021, the Global Cement and Concrete Association (GCCA) has published a Cement and Concrete Roadmap 2050 for the net zero concrete. In the roadmap, it is envisaged to produce carbon neutral concrete by 2050 and a sectoral commitment to cut CO2 emissions by a further 25 per cent by 2030. The world’s leading cement and concrete companies including major cement companies in India like UltraTech Cement Ltd., Holcim Group, Shree Cement Ltd., Dalmia Cement (B) Ltd., JK Cement Ltd, JSW Cement, Orient Cement Ltd. have accepted the goal to achieve net zero concrete by 2050 and committed to fully contribute to building the sustainable world of tomorrow. Dalmia Cement (Bharat) Ltd, the fourth largest cement company in India has committed to become carbon negative by 2040 and working on its roadmap to use 100 per cent biomass and capturing the biogenic CO2 emissions.

Energy efficiency

Decarbonisation of the energy requirement of the entire cement industry is not possible only through renewable electricity since the cement industry requires high-grade heat for manufacturing. Hydrogen, which is a clean and green energy carrier, can play a crucial role for this energy transition. Green hydrogen can be used to replace fossil fuel in cement manufacturing processes as a source of thermal heat. Currently, 96 per cent of hydrogen used for industrial applications as fuel is obtained from fossils (natural gas, oil, coal), and the remaining 4 per cent is through electrolysis. Electrolysis through renewable sources like solar and wind routes can increase this share significantly and renewable hydrogen obtained will be a more sustainable option for the future. One of the cement plants in the UK has recently done a feasibility study for 50 per cent hydrogen along with 50 per cent biomass as fuel in cement rotary kilns.

One of the important challenges for decarbonisation of the cement industry worldwide is to reduce the process emissions arising out of calcination of limestone. Carbon Capture and Utilisation, by capturing/separating the CO2 emissions arising from the calcination process and utilisation of the captured CO2, is the only solution. Several studies and start-ups worldwide are working to find cost effective energy efficient ways to capture CO2 from flue gases. Utilisation of hydrogen as fuel will also help in capturing/separation of process CO2. Thus, green hydrogen can act as an alternative fuel for cement plants and will play a major role in the decarbonisation of the cement sector.

The journey towards decarbonisation of Indian cement industry started in 2012 with preparation of a Low Carbon Technology Roadmap specifically for the industry, when International Energy Agency (IEA) and Cement Sustainability Initiative (CSI), in collaboration with the Confederation of Indian Industry (CII) and the National Council for Cement and Building Materials (NCB) prepared this document. Direct CO2 emissions are targeted to be further reduced to 0.35 t CO2/t of cement by 2050. The identified levers in the low carbon technology roadmap of Indian cement industry are (i) Substitution of Clinker, (ii) Alternate Fuel and Raw Materials, (iii) Improving Energy Efficiency, (iv) Installation of Waste Heat Recovery and (v) Newer technologies like Renewable Energy, Novel Cements, Carbon Capture and Storage/Utilisation.

To mitigate the problem, enormous endeavour so far have been made by responsible industries, research bodies and academia, to reduce CO2 emission from cement production process by developing new technological solutions, thus, continually stepping towards reducing the environmental footprint of cement production and making it more and more sustainable. Blended cements so far have stood the test of time and are found to offer significant performance advantages along with environmental mitigation in terms of reduced emission, natural resource conservation and waste utilisation. NCB, being a premier R&D organisation, is devoted to environmental sustainability and is carrying out several studies for development of low lime and low energy cements to mitigate carbon footprint during cement production and conservation of natural resources by exploring alternate raw materials and unconventional SCMs in development of blended cements. Some of the important projects currently undertaken at NCB for blended cement are discussed here:

a) Development of belite calcium sulpho-aluminate cement using low grade limestone and industrial waste

The Portland cement clinker manufactured by the Indian cement industry is almost a century old clinker, the production of which is quite energy intensive, emission releasing and majorly dependent on our natural resources. Belite sulfoaluminate clinkers (BCSA) are an alternative for sustainability of limestone reserves and CO2 emissions compared to the Portland Clinker. In addition, these materials require lower operating temperature of the kilns, ~1250ºC and they are easily ground due to their higher porosity. Presently, NCB has successfully conducted laboratory scale trials on preparation of the new clinker with the conventional raw materials being used for Portland clinker. The production process of BSAC requires sulphate sources such as gypsum or anhydrite as major raw materials. Additionally, the BCSA clinker is formed at a temperature of 1250°C resulting in thermal saving of 200°C, thereby, reducing CO2 emissions up to 30 per cent. The prepared new clinker has predominance of belite phase, and a new calcium sulpho-aluminate phase called as yeliminite phase in it. Besides trials on preparation of new clinker with conventional and natural raw materials, NCB has also succeeded in the utilisation of industrial by-products like Jarosite as a substitute for sulphate source with the use of low-grade limestone as the source of lime and silica.

b) Investigations on development of Portland composite cements based on fly ash and limestone

The blended cements, which are produced using more than one mineral addition, are known as composite cements. Fly ash conforming to IS 3812 (Part 1): 2003 and granulated blast furnace slag conforming to IS 12089: 1987 are used in the manufacture of composite cements (16415-2015) with 15-35 per cent and 20-50 per cent. respectively. Presently there is almost complete utilisation of granulated blast furnace slag in India. However, utilisation of fly ash in manufacture of PPC is still only 25 per cent out of around 232 million tonnes generated annually. Additionally, India has large reserves of low grade, dolomitic and siliceous limestones, manufacture of limestone and fly ash based composite cements will reduce the impact of CO2 on environment, utilisation of industrial wastes and enable production of cements with lower clinker factor leading to resource conservation, enhanced waste utilisation and greater sustainability in cement manufacture. In this study, Portland composite cement blends were prepared (140 nos) with four types of clinker from different regions of India along with the regional available fly ash (15-35 per cent) and limestone (5, 7 and 10 per cent). The results depicted that the clinker quality plays an important role on performance of limestone and fly ash based composite cements. The mortar studies indicated Portland composite cements based on limestone and fly ash with 35 per cent replacement of clinker by fly ash and limestone (keeping limestone content upto 7 per cent in it). Hydration studies showed Monocarboaluminate (Ca4Al2O6 2 CO3 2 11H2O) was found in the samples containing FA and LS, and the intensity of these peaks tend to be stronger when the amount of limestone is increased.

c) Portland Limestone Cement (PLC)

European standard EN-197-1 permits the use of 35 per cent, max limestone (CaCO3≥75 per cent) in the manufacture of PLC. This type of cements is not being standardised in India. NCB has taken up the studies to investigate the feasibility of using different grades of limestone in development of PLC and for its standardisation by Bureau of Indian Standards. In the study, five different OPC clinkers and eight samples of limestone (covering cement, dolomitic and low grade) samples were procured from five different cement plants located in different geographical locations of the country. Blends of OPC and PLC were prepared in the NCB laboratory by inter grinding clinker, limestone and gypsum. Comprehensive study on these blends was carried using physical, chemical and mineralogical characterisation. It has been found that characteristics of PLCs are related to clinker and limestone quality. The study concluded that limestone addition mainly influences the compressive strength of mortar and concrete, however, limestone addition of appropriate quality and fineness up to 15 per cent could be possible.

d) Utilisation of high magnesia limestone for making high magnesia clinker for blended cement

The total blended cement production in India is about 73 per cent and the clinker used for its manufacture has to confirm to the clinker specification IS 16353- 2015 where maximum permissible limit of MgO is 6 per cent. The limit of MgO content in PPC and PSC as per Indian standard are 6 per cent and 10 per cent respectively and the clinker factor in these blended cements are comparatively low in respect to the OPC. Therefore, there is a possibility to increase the MgO content in the clinker sample beyond the specified limits for the manufacturing of such blended cement. This will help in further enhancement in blended cement production and thus CO2 abatement. 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.

Substitution of clinker will remain the important lever for decarbonisation of the Indian cement industry. The outcome of NCB studies will help in providing more options for production of blended cements.

About the author:

Dr. BN Mohapatra is the Director General of National Council for Cement and Building Materials (NCCBM). He is a Phd in Cement Mineral Chemistry, enriched with 13 years of research and development and over 22 years of industry experience with a strong academic relations with premier institutes. He is the chairman of the Cement Sectoral Committee of the Bureau of Energy Efficiency (BEE).

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Concrete

ACC To Expand Cement Capacity Amid Strong Infrastructure Demand

Chairman signals calibrated growth and sustainability focus

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ACC will continue to expand its cement capacity in a calibrated manner, deepen its ready-mix concrete (RMC) footprint and accelerate the adoption of low-carbon technologies, the company chairman conveyed in the latest annual report. The note emphasised a balanced and disciplined approach as the business pursues growth while maintaining environmental safeguards.

He argued that the long-term growth outlook for the Indian economy remains strong but that demand conditions in the near term were likely to stay moderate, necessitating cautious expansion. He pointed to India’s relatively low per capita cement consumption compared with global averages as an indicator of significant long-term potential and highlighted the rise in public capital expenditure to Rs 12 trillion (Rs 12 tn), which he said accounted for about four point four per cent of the GDP.

Against this backdrop, ACC and the wider Adani Cement business are positioning themselves as integrated building materials solution providers rather than traditional commodity suppliers, prioritising capability creation over consolidation. The chairman framed cement as the ingredient and concrete as the performance and said that infrastructure and real estate development increasingly demand engineered solutions delivered at site.

He described how deeper integration across energy, logistics and digital systems is intended to improve responsiveness and efficiency across manufacturing, transport and market operations. The company intends to strengthen technical engagement, mix optimisation and application support to improve project timelines, reduce wastage and enhance structural durability while embedding data analytics and predictive systems.

On sustainability, ACC affirmed its commitment to reducing its environmental footprint through greater use of blended cement, renewable energy, alternative fuels and improved thermal efficiency, presenting industrial growth and environmental responsibility as parallel objectives. The message positioned the group to supply engineered concrete solutions at the point of application as it scales capacity and service offerings.

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Ambuja Sees Cement Demand Easing To Around Five Per Cent In FY27

Company Cites Housing, Infrastructure And Government Capex

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Ambuja Cements has said in its latest annual report that cement demand in India is likely to moderate to around five per cent in fiscal year twenty seven, marking a slowdown from the estimated six point five to seven point five per cent growth anticipated for fiscal year twenty six. The company described this as a transition to a more measured pace of expansion after several years of strong momentum in the sector.

It said that underlying demand drivers such as housing, infrastructure development, urbanisation and government capital expenditure remain intact and are expected to sustain cement consumption across regions. The report noted that global geopolitical uncertainties and weather risks, including forecasts of a below normal monsoon, could influence near term demand, while emphasising that the longer term infrastructure story for India continues to provide a solid foundation for the sector.

Industry observers have said that the sector may move towards mid single digit growth rates in fiscal year twenty seven after stronger performances in recent years. The company outlined a calibrated expansion strategy with capacity additions phased to match project pipelines, regional demand patterns and market absorption, seeking to avoid oversupply and pressure on pricing.

Ambuja has crossed the 100 million tonnes per annum capacity milestone (100 mn t per annum) following acquisitions and organic expansion, strengthening its position in the competitive market. The outlook in the report broadly aligns with other market assessments that placed demand at around five per cent in fiscal year twenty five, a recovery to six point five to seven point five per cent in fiscal year twenty six and an easing in fiscal year twenty seven as capacity increases. Executives remain focused on long term demand fundamentals driven by infrastructure and housing.

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Powering Cement Through Intelligent Motion

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Gears, drives, and motors have evolved from essential mechanical components into strategic enablers of reliability, efficiency, and sustainability in modern cement plants. ICR explores how advanced motion technologies, predictive maintenance, digitalisation, and intelligent drive systems are helping cement manufacturers reduce downtime, optimise energy use, and build future-ready operations.

As the Indian cement industry prepares for another phase of capacity expansion, the focus is shifting from merely increasing production volumes to improving operational efficiency, reliability, and sustainability. According to industry estimates, India is expected to add nearly 160–170 million tonnes of cement capacity between FY26 and FY28, driven by infrastructure investments, urbanisation, and housing demand. In this environment, gears, drives, and motors have emerged as critical enablers of productivity, forming the backbone of every major process from raw material extraction and grinding to clinker production and cement dispatch.
Motors alone account for nearly 60 per cent to 70 per cent of industrial electricity consumption globally, according to the International Energy Agency (IEA), while rotating equipment failures remain among the leading causes of unplanned downtime across heavy industries. In cement plants, where equipment operates under high loads, extreme dust conditions, elevated temperatures, and continuous-duty cycles, the performance of gears, drives, and motors directly influences energy consumption, maintenance costs, plant availability, and overall profitability. As digitalisation and Industry
4.0 technologies gain momentum, these systems are evolving from passive mechanical components into intelligent assets capable of delivering real-time operational insights.

Why gears, drives, and motors are the backbone of cement plant operations
Every major process in a cement plant depends on the seamless operation of gears, drives, and motors. Raw mills, vertical roller mills, crushers, kiln drives, conveyor systems, fans, and clinker coolers all rely on rotating equipment to maintain continuous production. A failure in any one of these systems can disrupt entire process chains, highlighting their strategic importance.
Modern cement plants process thousands of tonnes of material daily, requiring equipment capable of transmitting enormous torque while maintaining precision and reliability. Kiln drives and grinding systems, in particular, operate under some of the highest mechanical loads found in industrial manufacturing. The ability of gears and motors to withstand these conditions directly impacts plant throughput and production stability.
Satish Maheshwari, Chief Manufacturing Officer, Shree Cement says, “Effective lubrication management remains one of the most critical factors in extending the lifespan of cement plant drive systems. Proper lubrication, supported by regular oil analysis, vibration diagnostics, and condition monitoring, helps minimise wear, prevent unexpected failures, and maintain the integrity of critical components such as gearboxes, motors, and drive assemblies. By identifying potential issues at an early stage, plants can move from reactive maintenance to a more proactive and reliability-focused approach.”
“Smart motors, intelligent drives, and next-generation gearboxes are set to redefine cement plant maintenance and performance. Equipped with embedded sensors, IoT connectivity, digital twins, and AI-driven diagnostics, these technologies enable real-time condition monitoring, predictive maintenance, and seamless digital integration. As the industry embraces Industry 4.0, smart drive systems will play a pivotal role in improving energy efficiency, reducing downtime, and optimising asset performance across the cement manufacturing value chain” he adds.
Industry studies suggest that rotating equipment accounts for a significant proportion of maintenance expenditure in process industries. Effective design, selection, and maintenance of gears, drives, and motors therefore have a direct influence on asset utilisation, operational efficiency, and total cost of ownership.

The cost of downtime: reliability challenges in rotating equipment
Unplanned downtime remains one of the most expensive challenges facing cement manufacturers. Industry estimates indicate that a major failure involving a critical gearbox, kiln drive, or grinding mill can result in production losses running into lakhs of rupees per hour, depending on plant capacity and operating conditions.
Sanjeev Arora, President – Motion Business & IEC LV Motors Division, ABB India says, “One of the most significant shifts taking place in industrial decision-making today is moving away from evaluating equipment based solely on upfront capital cost toward understanding total cost of ownership (TCO). In a typical motor system, the purchase price often represents only a small fraction of the total lifecycle cost however energy consumption, maintenance requirements, downtime and operating efficiency account for the vast majority of long-term operational expenses. For cement manufacturers operating in highly competitive markets, this distinction is critical.”
“A high efficiency motor paired with an appropriately configured variable speed drive may require a higher initial investment, but the long-term benefits are substantial. Reduced electricity consumption, lower maintenance needs, longer service intervals and improved process stability can deliver faster payback and stronger profitability over time” he adds.
Cement plants present a particularly challenging environment for rotating equipment. Dust ingress, thermal fluctuations, shock loads, vibration, shaft misalignment, and lubrication contamination contribute significantly to equipment degradation. Studies by SKF indicate that nearly 50 per cent of bearing failures are linked to lubrication issues and contamination, while improper alignment and vibration-related problems remain leading causes of gearbox and motor failures.

Energy-efficient motors and drives: unlocking operational savings
Energy is one of the largest operating expenses for cement manufacturers, often accounting for 25 per cent to 35 per cent of total production costs. Grinding operations alone can consume nearly 60 per cent to 70 per cent of a plant’s electrical energy, making energy-efficient motors and drives a strategic investment.
According to the International Energy Agency, high-efficiency motors combined with Variable Frequency Drives (VFDs) can reduce energy consumption by 20 per cent to 30 per cent in suitable applications. By matching motor speed and torque to actual process requirements, VFDs minimise unnecessary power consumption while reducing mechanical stress on equipment, improving both efficiency and reliability.

Advances in gearbox design and power transmission technologies
Modern gearbox technology has evolved significantly in response to the increasing demands of cement manufacturing. Advanced materials, case-hardened gears, optimised tooth profiles, improved surface finishing, and enhanced lubrication systems are helping reduce friction, wear, and thermal loading.
Girish Hanchate, Director – Industrial Market, India SKF India (Industrial) says, “Smart diagnostics are significantly improving the lifecycle of gears, motors, and other rotating equipment by enabling a shift from reactive maintenance to condition-based asset management. Hidden issues such as vibration anomalies, bearing defects, misalignment, and temperature fluctuations can quietly reduce plant throughput by 10 per cent to 20 per cent while increasing energy consumption long before a breakdown occurs. By leveraging advanced sensors, predictive analytics, machine learning, and real-time monitoring of vibration, temperature, and motor current, cement manufacturers can detect developing faults early, optimise maintenance schedules, and prevent costly secondary damage. This not only improves reliability but also supports energy efficiency and sustainability objectives.”
“The next major evolution in drive and bearing technology lies in the development of fully integrated smart mechanical ecosystems that combine high-performance bearings, advanced lubrication management, and digital intelligence. Sensor-enabled condition monitoring embedded directly within bearings and drive systems allows operators to capture critical operational data at the source, enabling predictive maintenance and real-time performance optimisation. Innovations such as SKF’s VA9A1 Spherical Roller Bearing series, engineered specifically for demanding cement applications such as crushers and kilns, demonstrate this trend. By increasing internal bearing space and optimising lubricant flow, these designs improve grease retention, reduce wear, minimise downtime, and create more resilient, energy-efficient rotating equipment systems for the future of cement manufacturing” he adds.
Manufacturers are increasingly focusing on compact, high-torque gearbox designs capable of delivering higher power density while maintaining service life. Innovations such as condition-monitored gear systems, improved sealing technologies, and modular gearbox architectures are simplifying maintenance while enhancing operational reliability.

Predictive maintenance, condition monitoring, and asset health management
The shift from reactive to predictive maintenance is transforming asset management across the cement industry. Technologies such as vibration monitoring, thermography, oil analysis, ultrasound testing, and motor current signature analysis are enabling operators to identify potential failures before they occur.
Research by Deloitte suggests that predictive maintenance can reduce breakdowns by up to 70 per cent and lower maintenance costs by 25 per cent. In cement plants, where shutdown windows are limited and equipment operates continuously, predictive maintenance offers a powerful tool for improving reliability and extending asset life.
Digitalisation, industry 4.0, and the rise of intelligent drive systems
Industry 4.0 technologies are redefining the role of gears, drives, and motors. Smart sensors embedded within motors, bearings, and gear systems can continuously monitor temperature, vibration, load, lubrication condition, and energy consumption.
Girish Hanchate says, “As the industry embraces automation, sustainability, and digital transformation, the importance of intelligent motion technologies will continue to grow. The convergence of advanced engineering, predictive maintenance, and Industry 4.0 solutions is creating a new generation of cement plants where reliability, efficiency, and sustainability work together to deliver long-term value. For cement manufacturers navigating increasing production demands and environmental expectations, investing in smarter gears, drives, and motors is no longer optional—it is a business imperative.”
Cloud-based monitoring platforms and Industrial Internet of Things (IIoT) architectures enable maintenance teams to access equipment health data remotely, improving visibility across geographically dispersed operations. Advanced analytics and
artificial intelligence are further enhancing fault detection capabilities, enabling more accurate maintenance planning.
The emergence of digital twins represents another significant development. By creating virtual replicas of physical assets, operators can simulate operating conditions, predict failures, optimise maintenance schedules, and improve lifecycle management decisions. These technologies are helping transform rotating equipment into intelligent assets that actively contribute to operational decision-making.

Building future-ready cement plants through smart motion technologies
The future of cement manufacturing will depend heavily on the ability to integrate mechanical reliability with digital intelligence. Smart motion technologies combine high-efficiency motors,
intelligent drives, condition monitoring systems, and automation platforms to create more responsive and efficient operations.
Sustainability goals are also accelerating investment in advanced motion technologies. Reduced energy consumption, improved equipment efficiency, and extended asset life contribute directly to lower carbon emissions and reduced resource consumption.
These benefits align closely with the industry’s decarbonisation objectives.
As capacity expansions continue across India, future-ready cement plants will increasingly prioritise reliability, flexibility, and data-driven decision-making. Organisations that successfully integrate smart motion technologies into their operations will be better positioned to reduce costs, improve productivity, and maintain a competitive advantage in a rapidly evolving market.

Conclusion
Gears, drives, and motors are no longer viewed solely as mechanical components; they have become strategic assets that influence every aspect of cement plant performance. Their reliability affects production continuity, their efficiency impacts operating costs, and their digital capabilities increasingly shape maintenance and operational strategies.

  • Kanika Mathur

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