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The Future Looks Green

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Green Cement is no longer a distant thing, it is a concrete reality. As the Indian cement industry marches towards its net zero target, Dr Hitesh Sukhwal, Head – Environment, Udaipur Cement Works, gives an in-depth analysis of green cement and what the future holds for sustainability in cement manufacturing.

India is the second largest cement producing country in the world, after China, both in quality and technology. Indian cement plants are today the most energy efficient and environment friendly. The Indian cement industry is a frontrunner for implementing significant technology measures to ensure a greener future. The cement industry is an energy intensive and significant contributor to climate change. Cement production contributes greenhouse gasses directly and indirectly into the atmosphere through calcination and use of fossil fuels in an energy form. The industry believes in a circular economy by utilising alternative fuels and raw materials for making cement. Cement companies are focusing on major areas of energy efficiency by adoption of technology measures, clinker substitution by alternative raw material for cement making (blended cement), alternative fuels and green and clean energy resources. Cement industries are putting efforts on energy saving, reducing clinker factor (through blended cement) and CO2 footprint. All these efforts are being done for making green cement towards environment protection and a sustainable future.

Making Green Cement
While we talk about the carbon negative cement manufacturing process, our thrust is on green cement manufacturing. For cement industries, green is not a green cement in colour. It is a sustainable eco-friendly cement that can reduce the carbon footprint of cement production. The rise of blended cement, by utilising fly ash 30-35 per cent in Portland Pozzolana Cement (PPC) and slag 60-65 per cent in Portland Slag Cement (PSC), has made the cement green, which helps to reduce clinker factor and resultant minimise carbon footprint. The production of cement is estimated to rise over 600 million tonnes per annum by the year 2025. The Government of India has committed to five pledges called ‘Panchamrit’ at the COP26 summit.

  1. Reach net zero emission target by the year 2070.
  2. Installing non fossil fuel 500 GW electricity capacity by the year 2030.
  3. Generate half of all energy requirements by the year 2030 from renewable energy sources 4. Reduce emissions by 1 billion tonnes from now to 2030.
  4. Reduce emission intensity of GDP by 45 per cent by the year 2030.
    The cement industries are a top source of carbon dioxide emissions generation through fuel as well as electricity consumption. Pressure for the cement industry to minimize carbon emissions has increased rapidly from investors and government, both. Cement industries are looking forward to various options to decarbonise cement through the decarbonisation road map.
    Followings are considered for low carbon technology road map:
  5. Energy efficiency measures
  6. Reduction of clinker factor through product mix (slag, fly ash, pozzolana and others)
  7. Generation of more power from waste heat recovery system
  8. Circular economy – utilisation of alternative fuel and raw materials (RDF, hazardous waste, etc)
  9. Use of renewable energy sources like solar and wind power
  10. Use biomass as an alternative fuel
  11. Modernisation/upgradation of manufacturing process
  12. Green supply chain: eco labelling, green sourcing, optimising transport routes and mode of transport (like railway, green fuel etc.)
  13. Technological innovation: carbon capture, use and storage technologies
  14. Carbon sequestration
    Most of the cement plants have already implemented the above top seven points and minimised their carbon emissions. To reduce carbon emissions, the cement industry requires a large scale of investments on technologies for maintaining a low carbon technology road map.

Types of Green Cement

  1. Portland Pozzolana Cement (PP) – IS:1489-2015 (Part-I): Fly ash
  2. Portland Pozzolana Cement (PP) – IS:1489-2015 (Part-II): Calcined Clay
  3. Portland Slag Cement (PSC) – IS:455-2015
  4. Composite Cement – IS:16415-2015
  5. Sulphate Resisting Portland Cement – IS:12330-1988
  6. Super Sulphated Cement – IS:6909-1990
  7. Portland Limestone Cement (PLC)
  8. Portland Composite Cement (PCC)
  9. Portland Dolomitic Limestone Cement (PDC)
  10. Limestone Calcined Clay Cement (LC3)
  11. Reactive Belite reach Portland Cement (RBPC)
  12. Geopolymer Cement

Advantages of Green Cement

  1. It has potential to bring down carbon emission near about 80 per cent lower than the production of traditional cement.
  2. Best in construction for green building – acid resistance and lower atmospheric heat.
  3. Low chloride permeability as compared to OPC.
  4. Requires less amount of energy during manufacturing.
  5. Green cement is economically and environmentally friendly.
  6. Green cement reduces air and land pollution.
  7. High tensile strength and higher resistance to chemical corrosion.
  8. Low water demand thus water conservation.
  9. Natural resource conservation.
  10. Boost a circular economy.
    The analysis results from the above table, the performance of blended cement was observed better than OPC concrete excluding resistance against carbonation. Concrete made with PPC, PSC and composite cement has a longer service life as compared to OPC concrete in an aggressive environment.

Environmental Benefits of Green Cement
To analyse the environmental impacts of blended cement, various research is being performed by national and international agencies. In blended cement, as the clinker factor is reduced, the corresponding requirements of limestone, additives, coal and electrical energy for production of blended cement will be reduced proportionately. In PPC, PSC and composite cement, the clinker factor is reduced to 65 per cent, 40 per cent and 45 per cent respectively.
As per Indian standard specification IS: 455-2015, GBFS can be used in the range of 25-70 per cent in the PSC. Indian cement industries utilise about 92 per cent of granulated slag generated by the different steel plants. Currently, India produces approximately 25 million tonnes of blast furnace slag out of which 22 million tonnes of slag is granulated. At present, an average of 57 per cent (by weight) of GBFS is used in PSC in India1.
Fly ash is being used by the cement industry as a pozzolanic material in manufacturing of PPC. It saves both precious limestone and coal. The utilisation of fly ash in manufacturing of cement is a high value-added use. Fly ash conforming to standard IS: 3812 (1) 2013 can be used (up to 35 per cent maximum) in the manufacture of PPC as per IS: 1489 (part 1) 2015. The enhanced use of fly ash in PPC results in the reduction of clinker factor in cement, followed by lessened CO2 emissions through decreased fuel combustion and limestone calcination1.
In blended cement, while the clinker factor is reduced in PPC, PSC and composite cement, it will not only help to prevent land pollution due to increasing production of such types of high-volume industrial waste but also reduce corresponding direct emission of carbon dioxide.

Challenges
In the near future, as other industrial sectors are also having a decarbonise target, fly ash and slag from energy and steel industries could be in shorter supply as clinker substitutes. Biomass supply varies by region to region therefore its availability for utilisation as an alternative fuel could be a costly affair. The use of alternative fuels in the cement industry is growing rapidly to increase the Thermal Substitution Rate (TSR). The industry is now working towards TSR of 25 per cent by 2025 and 30 per cent by 2030 (CMA 2020 data). A region wise inventorisation of alternative fuel (like MSW, biomass, industrial byproduct, hazardous waste), which has high calorific value, is an urgent requirement. Moreover, there are several challenges associated like the segregation of MSW, collection of biomass, handling of hazardous waste etc.
Although the leading cement companies in India accepted the goal to achieve Net Zero target by 2050. However, carbon emission from calcination of limestone (process emissions) is still one of the biggest challenges for the cement industry. Here, technological innovations like carbon capture, use and storage (CCUS) and carbon sink require more R&D for mitigation of carbon dioxide emission, and hence for making more green cement.

Green is the Future
Green cement is the future of the cement industry and best for the environment. If we can reduce the clinker factor, it would reduce the significant amount of carbon emission during cement making. Besides manufacturing of PPC, PSC and Composite Cement, the cement industry is now doing R&D on PLC. The Indian cement industry is playing a catalytic role in natural resource conservation and boosting the circular economy. For making cement, utilisation of other industrial waste as an alternative fuel and raw material, adopting renewable energy sources, green procurement and supply chain management – all these efforts are put by cement industries for green cement production.
The use of PPC and PSC is permitted by national and international standards/specifications including most government bodies1. The partial replacement of clinker, which is an expensive component of cement as well as resource, energy and emission intensive, can be ground with these additives (like pozzolana and granulated blast furnace slag) to improve the sustainability of the material. Most importantly, the performance of cement can be improved through this replacement. The use of PPC conforming to requirement of IS:1489 in substructures of bridges is already permitted by the Ministry of Railways, Railway Board, Government of India.
In India, the production of OPC is continuously declining, with simultaneous increase in production of blended cements like PPC, PSC and composite cement based on granulated blast furnace slag and fly ash. Other cement formulations such as PLC and limestone calcined clay cement are also at different stages of development in India. At present, blended cements have a greater share (73 per cent) in comparison to OPC (27 per cent) of the total cement production. Blended cements provide the means to reduce the clinker factor even further soon, without a compromise on economy and safety1.

References

  1. Global Cement and Concrete Association – Blended Cement, Green, Durable and Sustainable – 2022

ABOUT THE AUTHOR:
Dr Hitesh Sukhwal is the Head – Environment at JK Lakshmi Cement
. He is the Environment Coordinator for the North-West region units. He has MSc and PhD degrees in Environmental Sciences from Mohanlal Sukhadia University. His area of expertise is environment legislation.

Concrete

Merlin Prime Spaces Acquires 13,185 Sq M Land Parcel In Pune

Rs 273 crore purchase broadens the developer’s Pune presence

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Merlin Prime Spaces (MPS) has acquired a 13,185 sq m land parcel in Pune for Rs 273 crore, marking a notable expansion of its footprint in the city.

The transaction value converts to Rs 2,730 mn or Rs 2.73 bn.

The parcel is located in a strategic area of Pune and the firm described the acquisition as aligned with its growth objectives.

The deal follows recent activity in the region and will be watched by investors and developers.

MPS said the acquisition will support its planned development pipeline and enable delivery of commercial and residential space to meet local demand.

The company expects the site to provide flexibility in product design and phased development to respond to market conditions.

The move reflects an emphasis on land ownership in key suburban markets.

The emphasis on land acquisition reflects a strategy to secure inventory ahead of demand cycles.

The purchase follows a period of sustained investor interest in Pune real estate, driven by expanding office ecosystems and residential demand from professionals.

MPS will integrate the new holding into its existing portfolio and plans to engage with local authorities and stakeholders to progress approvals and infrastructure readiness.

No financial partners were disclosed in the announcement.

The firm indicated that timelines will depend on approvals and prevailing market conditions.

Analysts note that strategic land acquisitions at scale can help developers manage costs and timelines while preserving optionality for future projects.

MPS will now hold an enlarged land bank in the region as it pursues growth, and the acquisition underlines continued corporate appetite for measured expansion in second tier cities.

The company intends to move forward with detailed planning in the coming months.

Stakeholders will assess how the site is positioned relative to existing infrastructure and connectivity.

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Concrete

Adani Cement and Naredco Partner to Promote Sustainable Construction

Collaboration to focus on skills, technology and greener practices

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Adani Cement has entered a strategic partnership with the National Real Estate Development Council (Naredco) to support India’s construction needs with a focus on sustainability, workforce capability and modern building technologies. The collaboration brings together Adani Cement’s building materials portfolio, research and development strengths and technical expertise with Naredco’s nationwide network of more than 15,000 member organisations. The agreement aims to address evolving demand across housing, commercial and infrastructure sectors.

Under the partnership, the organisations will roll out skill development and certification programmes for masons, contractors and site supervisors, with training to emphasise contemporary construction techniques, safety practices and quality standards. The programmes are intended to improve project execution and on-site efficiency and to raise labour productivity through standardised competencies. Emphasis will be placed on practical training and certification pathways that can be scaled across regions.

The alliance will function as a platform for knowledge sharing and technology exchange, facilitating access to advanced concrete solutions, innovative construction practices and modern materials. The effort is intended to enhance structural durability, execution quality and environmental responsibility across developments while promoting adoption of low-carbon technologies and green cement alternatives. Companies expect these measures to contribute to longer term resilience of built assets.

Senior executives conveyed that the partnership reflects a shared commitment to strengthening quality and sustainability in construction and that closer engagement with developers will help integrate advanced materials and technical support throughout the project lifecycle. Leadership noted the need for responsible construction practices as urbanisation accelerates and indicated that the association should encourage wider adoption of green building norms and collaboration within the real estate and construction ecosystem.

The organisations said they will also explore integrated building solutions, including ready-mix concrete offerings, while supporting initiatives aligned with affordable and inclusive housing. The partnership will progress through engagements, conferences and joint training programmes targeting rapidly urbanising cities and growth centres where demand for efficient and environmentally responsible construction grows. Naredco, established under the aegis of the Ministry of Housing and Urban Affairs, will leverage its policy and advocacy role to support implementation.

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Concrete

Operational Excellence Redefined!

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Operational excellence in cement is no longer about producing more—it is about producing smarter, cleaner and more reliably, where cost per tonne meets carbon per tonne.

Operational excellence in cement has moved far beyond the old pursuit of ‘more tonne’. The new benchmark is smarter, cleaner, more reliable production—delivered with discipline across process, people and data. In an industry where energy can account for nearly 30 per cent of manufacturing cost, even marginal gains translate into meaningful value. As Dr SB Hegde, Professor, Jain College of Engineering & Technology, Hubli and Visiting Professor, Pennsylvania State University, USA, puts it, “Operational excellence… is no longer about producing more. It is about producing smarter, cleaner, more reliably, and more sustainably.” The shift is structural: carbon per tonne will increasingly matter as much as cost per tonne, and competitiveness will be defined by the ability to stabilise operations while steadily lowering emissions.

From control rooms to command centres

The modern cement plant is no longer a handful of loops watched by a few operators. Control rooms have evolved from a few hundred signals to thousands—today, up to 25,000 signals can compete for attention. Dr Rizwan Sabjan, Head – Global Sales and Proposals, Process Control and Optimization, Fuller Technologies, frames the core problem plainly: plants have added WHRS circuits, alternative fuels, higher line capacities and tighter quality expectations, but human attention remains finite. “It is very impossible for an operator to operate the plant with so many things being added,” he says. “We need somebody who can operate 24×7… without any tiredness, without any distraction… The software can do that for us better.”

This is where advanced process control shifts from ‘automation spend’ to a financial lever. Dr Hegde underlines the logic: “Automation is not a technology expense. It is a financial strategy.” In large kilns, a one per cent improvement is not incremental—it is compounding.

Stability is the new productivity

At the heart of operational excellence lies stability. Not because stability is comfortable, but because it is profitable—and increasingly, low-carbon. When setpoints drift and operators chase variability, costs hide in refractory damage, thermal shocks, stop-start losses and quality swings. Dr Sabjan argues that algorithmic control can absorb process disturbances faster than any operator, acting as ‘a co-pilot or an autopilot’, making changes ‘as quick as possible’ rather than waiting for manual intervention. The result is not just fuel saving—it is steadier operation that extends refractory life and reduces avoidable downtime.

The pay-off can be seen through the lens of variability: manual operation often amplifies swings, while closed-loop optimisation tightens control. As Dr Sabjan notes, “It’s not only about savings… there are many indirect benefits, like increasing the refractory life, because we are avoiding the thermal shocks.”

Quality control

If stability is the base, quality is the multiplier. A high-capacity plant can dispatch enormous volumes daily, and quality cannot be a periodic check—it must be continuous. Yet, as Dr Sabjan points out, the biggest error is not in analysis equipment but upstream: “80 per cent of the error is happening at the sampling level.” If sampling is inconsistent, even the best XRF and XRD become expensive spectators.

Automation closes the loop by standardising sample collection, transport, preparation, analysis and corrective action. “We do invest a lot of money on analytical equipment like XRD and XRF, but if it is not put on the closed loop then there’s no use of it,” he says, because results become person-dependent and slow.

Raju Ramachandran, Chief Manufacturing Officer (East), Nuvoco Vistas Corp, reinforces the operational impact from the plant floor: “There’s a stark difference in what a RoboLab does… ensuring that the consistent quality is there… starts right from the sample collection.” For him, automation is not about removing people; it is about making outcomes repeatable.

Human-centric automation

One of the biggest barriers to performance is not hardware—it is fear. Dr Sabjan describes a persistent concern that digital tools exist to replace operators. “That’s not the way,” he says. “The technology is here to help operator… not to replace them… but to complement them.” The plants that realise this early tend to sustain performance because adoption becomes collaborative rather than forced.

Dr Hegde adds an important caveat: tools can mislead without competence. “If you don’t have the knowledge about the data… this will mislead you… it is like… using ChatGPT… it may tell the garbage.” His point is not anti-technology; it is pro-capability. Operational excellence now requires multidisciplinary teams—process, chemistry, physics, automation and reliability—working as one.

GS Daga, Managing Director, SecMec Consultants, takes the argument further, warning that the technology curve can outpace human readiness: “Our technology movement AI will move fast, and our people will be lagging behind.” For him, the industry’s most urgent intervention is systematic skilling—paired with the environment to apply those skills. Without that, even high-end systems remain underutilised.

Digital energy management

Digital optimisation is no longer confined to pilots; its impact is increasingly quantifiable. Raghu Vokuda, Chief Digital Officer, JSW Cement, describes the outcomes in practical terms: reductions in specific power consumption ‘close to 3 per cent to 7 per cent’, improvements in process stability ‘10 per cent to 20 per cent’, and thermal energy reductions ‘2–5 per cent’. He also highlights value beyond the process line—demand optimisation through forecasting models can reduce peak charges, and optimisation of WHRS can deliver ‘1 per cent to 3 per cent’ efficiency gains.

What matters is the operating approach. Rather than patchwork point solutions, he advocates blueprinting a model digital plant across pillars—maintenance, quality, energy, process, people, safety and sustainability—and then scaling. The difference is governance: defined ownership of data, harmonised OT–IT integration, and dashboards designed for each decision layer—from shopfloor to plant head to network leadership.

Predictive maintenance

Reliability has become a boardroom priority because the cost of failure is blunt and immediate. Dr Hegde captures it crisply: “One day of kiln stoppage can cost several crores.” Predictive maintenance and condition monitoring change reliability from reaction to anticipation—provided plants invest in the right sensors and a holistic architecture.

Dr Sabjan stresses the need for ‘extra investment’ where existing instrumentation is insufficient—kiln shell monitoring, refractory monitoring and other critical measurements. The goal is early warning: “How to have those pre-warnings… where the failures are going to come… and then ensure that the plant availability is high, the downtime is low.”

Ramachandran adds that IoT sensors are increasingly enabling early intervention—temperature rise in bearings, vibration patterns, motor and gearbox signals—moving from prediction to prescription. The operational advantage is not only fewer failures, but planned shutdowns: “Once the shutdown is planned in advance… you have lesser… unpredictable downtimes… and overall… you gain on the productivity.”

Alternative fuels and raw materials

As decarbonisation tightens, AFR becomes central—but scaling it is not simply a procurement decision. Vimal Kumar Jain, Technical Director, Heidelberg Cement, frames AFR as a structured programme built on three foundations: strong pre-processing infrastructure, consistent AFR quality, and a stable pyro process. “Only with the fundamentals in place can AFR be scaled safely—without compromising clinker quality or production stability.”

He also flags a ground reality: India’s AFR streams are often seasonal and variable. “In one season to another season, there is major change… high variation in the quality,” he says, making preprocessing capacity and quality discipline mandatory.

Ramachandran argues the sector also needs ecosystem support: a framework for AFR preprocessing ‘hand-in-hand’ between government and private players, so fuels arrive in forms that can be used efficiently and consistently.

Design and execution discipline

Operational excellence is increasingly determined upstream—by the choices made in concept, layout, technology selection, operability and maintainability. Jain puts it unambiguously: “Long term performance is largely decided before the plant is commissioned.” A disciplined design avoids bottlenecks that are expensive to fix later; disciplined execution ensures safe, smooth start-up with fewer issues.

He highlights an often-missed factor: continuity between project and operations teams. “When knowledge transfer is strong and ownership carries beyond commissioning, the plant stabilises much faster… and lifecycle costs reduce significantly.”

What will define the next decade

Across the value chain, the future benchmark is clear: carbon intensity. “Carbon per ton will matter as much as cost per ton,” says Dr Hegde. Vokuda echoes it: the industry will shift from optimising cost per tonne to carbon per ton.

The pathway, however, is practical rather than idealistic—low-clinker and blended cements, higher thermal substitution, renewable power integration, WHRS scaling and tighter energy efficiency. Jain argues for policy realism: if blended cement can meet quality, why it shall not be allowed more widely, particularly in government projects, and why supplementary materials cannot be used more ambitiously where performance is proven.

At the same time, the sector must prepare for CCUS without waiting for it. Jain calls for CCUS readiness—designing plants so capture can be added later without disruptive retrofits—while acknowledging that large-scale rollout may take time as costs remain high.

Ultimately, operational excellence will belong to plants that integrate—not isolate—the levers: process stability, quality automation, structured AFR, predictive reliability, disciplined execution, secure digitalisation and continuous learning. As Dr Sabjan notes, success will not come from one department owning the change: “Everybody has to own it… then only… the results could be wonderful.”

And as Daga reminds the industry, the future will reward those who keep their feet on the ground while adopting the new: “I don’t buy technology for the sake of technology. It has to make a commercial sense.” In the next decade, that commercial sense will be written in two numbers—cost per tonne and carbon per tonne—delivered through stable, skilled and digitally disciplined operations.

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