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Cement Beyond Carbon

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Ashok Kumar Dembla, President & MD and Deepti Varshney, General Manager – Tendering, KHD Humboldt Wedag, outline how next-generation technologies, alternative materials and carbon management strategies can help India’s cement industry move beyond efficiency-driven decarbonisation toward a truly Net Zero future.

The cement industry, crucial for global and Indian infrastructure, contributes 7-8 per cent of global CO2 emissions. India, the second-largest producer, faces rising cement demand with ongoing infrastructure growth. While energy efficiency and the Perform, Achieve and Trade (PAT) scheme have driven progress, achieving net-zero requires more than efficiency alone. Reducing emissions is vital for sustainability and aligning with the Paris Agreement’s 1.5–2?°C goals. The transition to net-zero also spurs innovation, R&D, sustainable product markets, green investments and job creation, combining growth with environmental protection. As a committed partner, KHD evaluates current emissions, explores low-CO2 technologies, and considers economic and policy factors to help the cement industry reach net-zero targets.

Targets and challenges
The cement industry is a significant source of global CO2 emissions, with clinker production alone releasing 0.6–0.8 tonnes per tonne of clinker, depending on technology and energy efficiency. Grinding contributes less—about 0.1–0.3 tonnes per tonne of cement—impacted by energy sources and use of supplementary materials (SCMs).
Global cement emissions rose from 0.57 billion tonnes in 1990 to 2.9 billion tonnes in 2022, led by China, India, Europe, and the US India’s 480-million-tonne clinker capacity emits roughly 240 million tonnes of CO2, considering utilisation and efficiency gains. Without strong action, IEA projects cement could reach 13 per cent of global CO2 by 2050, emphasising the urgency of emission reduction. Looking into the scenario the global initiatives are on the peak be it the Paris Agreement and NDCs, Carbon Pricing and Emissions Trading Systems (ETS), Mission Innovation – Cement Challenge or the Global Cement and Concrete Association (GCCA)Sustainability Charter. Few of Indian cement companies are members of GCCA and committed to road map of Net Zero by 2050. Based on the targets set the companies have already taken advance steps to sustain their commitment of net zero.

Low CO2 emission technologies
GCCA and TERI have mapped the roadmap for the Indian cement industry based on the various available and viable measures which can help to achieve the Net Zero goal.
The methods involve using alternative raw materials and fuels, incorporating carbon capture, utilisation and storage (CCUS) techniques, as well as exploring carbon offsetting and sustainable practices. Additionally, advancements such as alkali-activated cements and the utilisation of alternative raw materials play significant roles in reducing the overall carbon footprint of cement production. These technologies present a promising avenue to reconcile cement production with environmental stewardship and climate change mitigation effort. The KHD approach is well aligned with the global as well as India initiatives. The solutions provided and the impacts are captured in the matrix.

a) Carbon capture, utilisation and storage
The benefits of Carbon Capture, Utilisation, and Storage (CCUS) in the cement industry are substantial. One of the primary advantages is the ability to transform CO2 from a pollutant into a valuable resource. By using CO2 to produce construction materials, the industry can advance towards a circular economy, minimising waste and optimising resource utilisation. Additionally, incorporating CO2 into cementitious products enhances the overall sustainability of the industry. However, several challenges need to be addressed.
The development of CCUS technologies is crucial to improve their efficiency and reduce costs, making them more accessible for widespread adoption. One such establishment is KHD oxyfuel Technology. KHD Humboldt Wedag’s Oxyfuel Kiln Technology is an advanced solution for sustainable cement production, enabling a concentrated CO2 stream of up to 85 per cent, which greatly facilitates carbon capture. By recirculating exhaust gas enriched with oxygen, the system ensures optimal fuel oxidation while significantly reducing fuel consumption. This technology can be retrofitted to existing kiln plants, offering substantial savings in both CAPEX and OPEX for carbon capture installations. Successful implementation requires tight sealing technologies and specific cooler adaptations, ensuring high efficiency and reliability. KHD’s Oxyfuel Technology empowers cement plants to achieve lower emissions without compromising operational performance.

b) Alternative raw materials and alternative fuels
Using alternative raw materials like fly ash and slag, which are by-products, helps reduce energy consumption and lower carbon emissions during cement production. Natural pozzolans and calcined clays provide environmentally friendly substitutes for clinker, further minimising CO2 emissions. Additionally, alternative fuels such as biomass and waste-derived fuels are renewable sources that decrease reliance on fossil fuels and address waste management challenges.
These alternatives collectively contribute to sustainable and greener cement manufacturing, effectively addressing environmental concerns and promoting circular economy principles. Incorporating alternative raw materials and fuels into cement production mitigates the industry’s environmental impact by decreasing reliance on traditional resources, lowering energy consumption, reducing CO2 emissions, and promoting circular economy practices through the utilisation of waste materials. Furthermore, this approach aligns with the industry’s sustainability goals, contributing to a more environmentally responsible cement manufacturing process. However, appropriate processing, quality control, and regulatory compliance are essential to ensure the successful integration of these alternatives into cement production.

c) Carbon offsetting and sustainable practices
Carbon offsetting lets cement companies compensate for unavoidable CO2 emissions by funding verified projects—like reforestation, renewable energy, or efficiency initiatives—that remove or avoid an equivalent amount of greenhouse gases. Sustainable cement production focuses on reducing emissions at source through better resource use and cleaner inputs: replacing clinker with SCMs (fly ash, slag, calcined clays), co-processing biomass and alternative fuels, recovering waste heat from kilns, and adopting more efficient kiln and grinding technologies. Together these measures lower CO2 intensity, cut energy use, ease pressure on raw materials, and buy time for longer-term solutions such as electrification and CCUS.
KHD has various options of using alternative raw materials and fuels into manufacturing process. KHD’s Flash Tube Calciner delivers exceptional performance in clay calcination, offering the highest heat efficiency and superior process control. It ensures excellent product quality, precise colour consistency and reliable operation under all conditions. The system is capable of utilising a wide range of alternative fuels, providing flexibility and sustainability. All components are well-proven within KHD’s portfolio, backed by decades of operational experience and reliability.
Another sustainable practice involves responsible sourcing and supply chain management. By ensuring that raw materials are ethically sourced and supply chains adhere to sustainable practices, the industry minimises its ecological footprint and upholds social responsibility.

d) Innovative approaches and emerging technologies
Innovative approaches and emerging technologies in cement production are pivotal in revolutionising the industry towards sustainability. Alkali-activated cements, utilising alternative raw materials, and biomass co-processing are at the forefront. Alkali-activated cements significantly reduce CO2 emissions by operating at lower temperatures. Alternative raw materials like fly ash and slag mitigate the environmental impact by substituting clinker. Biomass co-processing not only offers an alternative fuel source but also manages waste. Moreover, electrification, CCU, and novel production techniques including biomimicry and bioinspired cementitious materials promise a more eco-friendly and efficient future, essential for achieving a sustainable cement sector.

Prospective advancements
Emerging trends in cement are converging on sustainability and tech-driven efficiency: scaling carbon capture and storage, low-clinker solutions (eg: calcined clay), electrification powered by renewables, and digital optimisation via AI/IoT are cutting emissions and energy use, while circular practices, waste-heat recovery, and life-cycle assessments improve material and resource efficiency. Advanced innovations — from nanotechnology to additive manufacturing and hybrid integrated plants — are enhancing performance and enabling new construction methods. As a technology provider, KHD plays a vital role across these steps, supplying the equipment and solutions needed to manage carbon and drive the industry toward a low-carbon future.

Blueprints for a Net Zero carbon sector
By fostering active collaboration among governments, industry players, research institutions and communities, the cement sector can transition smoothly to low-carbon production: implementing the table’s recommendations will enable adoption of low-CO2 technologies, alternative raw materials and fuels, and targeted measures to overcome barriers such as high costs and regulatory gaps. Collective innovation, coordinated financing and policy support will drive pilots into scaled deployment, reduce emissions at source and position the industry as a pivotal contributor to global climate action while setting a sustainability precedent for other sectors.
A phased CO2 roadmap from 2024–2050 structures this shift: the Foundation phase (2024–2030) focuses on policy design, finance mobilization, technology pilots and public awareness to create the enabling environment; the Acceleration phase (2031–2040) scales up renewables, decarbonizes logistics and industry heat, and deploys CCUS demonstrations at scale; and the Net Zero Transition phase (2041–2050) targets aggressive emission reductions, widescale negative-emissions solutions and international cooperation to achieve net-zero outcomes by 2050.

Conclusion
The roadmap presents a clear, practical path to decarbonize the historically carbon-intensive cement industry, stressing urgency as infrastructure demand grows. It highlights key levers — CCU/CCS, renewables, alternative raw materials and fuels, and efficiency upgrades — and showcases KHD’s solutions at every step. While policy support, finance, and economic viability are essential, technical, infrastructure and social challenges remain; overcoming them will require coordinated action, knowledge sharing, and innovation. Adoption of these measures can steer the sector to a resilient, Net Zero future.

ABOUT THE AUTHOR:
Ashok Kumar Dembla, President and Managing Director, KHD Humboldt Wedag, holds over 40 years of experience in the cement industry and has led plant operations, projects, and global partnerships.

Deepti Varshney, General Manager, KHD Humboldt Wedag, is an environmental management professional with expertise in leadership, project management, and business development.

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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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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