Concrete
(Re)discovering Alternative Raw Materials are Essential to the Green Cement Plant
Published
4 years agoon
By
admin
As the realities of climate change continue to hit home, social pressure on heavy emitters is increasing and financial pressure will follow, forcing cement producers to act. The cement industry has a responsibility to follow through on its promises to decarbonise.
As a leading supplier to the industry, FLSmidth feels this responsibility keenly. This article is an overview of the options to decarbonise – reducing the clinker factor. As we will learn, the green cement plant of the future may not look so different from a plant you would see today, but it is. The difference is in the way it is operated, what is being put into it, and some of the supporting technology.
Fly ash – set to get a second wind
As the cement industry faces increasing scrutiny over its environmental footprint – no stone is left unturned in attempts to reduce CO2 emissions. Fly ash has been used for decades to avoid the resource intensive limestone clinker, but shortages have led experts to debate; have we reached the full potential for fly ash in cement or could harvesting landfills give fly ash a second wind?
Fly ash is a great supplementary cementitious material – it has the right properties, meaning that it reacts with lime to form cementitious compounds. It is a by-product from coal-firing industries, but in some cases has ended up in landfills – especially up until 1929, when it was first used in concrete to minimise the use of cement when building the massive Hoover Dam on the Colorado River in the USA.
With the potential to replace up to 30 per cent of traditional clinker, fly ash quickly became very attractive to the cement industry and a sought-after commodity. Today, as the green transition of power plants and other heavy industry is accelerating – some countries are phasing out coal and turning towards green energy, natural gas, and/or biofuels, with the result being that fly ash is now in short supply.But just as steel, paper and sugar industries are eager to minimise their environmental footprint, so is cement. And the use of fly ash is both a proven and effective ingredient. The shortage of fresh fly ash has led more and more industry stakeholders to turn their attention towards the centuries of landfilled fly ash.
To date, billions of tonnes of fly ash have been landfilled. ‘Harvesting’ fly ash from these landfills makes some industry experts confident that this waste-product could have a second wind in cement.
“As we strive towards fulfilling our MissionZero promise of enabling net zero cement production by 2030, we need every tool in the toolbox. Reducing the clinker factor is a key element to that. Fly ash is a proven and well-integrated SCM – to pursue the exploitation of landfilled fly ash would obviously boost our efforts.”
To Thomas Petithuguenin, Head of Research and Partnerships for Cement, FLSmidth, every possible path to MissionZero needs to be explored.
“I am not saying that fly ash harvesting is a quick-win, but from a product point of view, it is a known ingredient and gives confidence in terms of quality and performance. The challenge is the logistics and infrastructure, which we need to investigate with stakeholders across the value chain.”
Upcycled concrete – a massive business opportunity
Repurposing of construction waste is a global, multi-billion-dollar business – to the cement industry it looks to be a win-win situation. As the world’s leading equipment supplier to both the Cement- and Mining industries, FLSmidth is well-positioned to support its customers in capturing a piece of the pie, says Petithuguenin.
At an annual growth rate of 4 per cent, the global construction and demolition waste management market is projected to be worth $142.92 billion in 2028. Combined with the cement industry’s acute need to reduce its environmental footprint, we see an increasing interest from customers exploring how to enter the market.
The recycling of concrete is not a new business case – different technologies and applications have been deployed for decades, but most often in terms of ‘downcycling’ where material will end up as road fill. Today, the average Construction and Demolition Waste (CDW) recycling rate in Europe is around 70 per cent and even though it still substitutes the use of virgin material, actual ‘upcycling’ has a massive potential of producing high-value materials out of tonnes of construction waste every year.
By upcycling concrete, we are not only able to leave virgin, raw materials in the ground, we are also able to reduce the need for traditional, resource-intensive clinker. At a time when no stone is left unturned in the quest for CO2 savings from cement production, reusing recycled cement fines as a filler, supplementary cementitious material (SCM) or by converting them into belite clinker is an attractive business-case.
The sustainability aspects of upcycling go hand-in-hand with cost-savings from eliminating the excavation of new raw-materials and a majority of the fuel and energy required for the calcination process of limestone.
According to the International Energy Association, the integration of emerging technologies like lowering the clinker-factor in cement and carbon capture is identified to provide some of the largest cumulative CO2 reductions in the 2-degree Celsius Scenario (2DS) compared to the Reference Technology Scenario (RTS) by 2050.
As we move into an industrial scale process of turning old concrete to a new cementitious material, we would need to do a few extra steps to get as pure aggregates, sand and cement fines as possible. A procedure that involves process knowledge within crushing and screening and just as important, some heavy-duty equipment such as a jaw crusher, impact crusher, cone crusher, elliptical screens, classifiers, and bag filters.
After crushing, the aggregates and sand are used in new concrete, with the potential to substitute 100% of the natural aggregates and sand needed. The cement fines, left from the crushing and grinding are ready to be converted into a belite clinker, most likely at an urban processing plant, whereafter it is mixed with OPC clinker at a 30-70 per cent ratio and reused on site – reducing the climate footprint of both the old and new building, bridge or road project. Another option is to take the cement fines back into the cement industry and carbonate them, which will activate them to SCMs – allowing their mixing with clinker (and reducing the clicker proportion, therefore, the CO2 emissions).
Today, an office building has an expected lifespan of 20 years, and a residential building a lifespan of 30-50 years. That’s extremely short and underlines the need for upcycling. If the industry is to support an accelerating urbanisation, the winners of the construction industry will be the ones who see opportunities in waste, which can be used again and again. And they will be the ones getting the building-licences from government authorities.

Mine tailings – a potential goldmine for cement
Tailings are both a safety issue and a huge financial burden to miners. But to cement and concrete producers they might hold a massive reservoir of untapped potential. With a shared ambition to reduce the environmental footprint of both cement and mining operations, FLSmidth is well-positioned to support its customers inturning mine tailings into value-added products, says Petithuguenin.
Mine tailings are the leftovers after the processing and extraction of metals and minerals from the basic ores. The total amount of mine tailings in active and inactive, closed storages around the world is estimated at more than 200 km3. Any attempt to describe the volumes easily fails as these enormous amounts are hard to grasp, but imagine a cube, six by six kilometres, weighing approximately 280 billion tonnes.
As an old proverb goes, ‘one man’s trash is another man’s treasure’. To miners, mine tailings are a costly by-product, which are difficult to manage due to the large quantities. They can pose a safety risk due to the instability of storage facilities further hampered by the material fineness and moisture content. Some of these challenges are mitigated with tailings storage solutions such as dry-stacking, backfilling the tailings material in old mine pits, and using them as aggregates in the construction industry. However, for many miners, safe and secure tailings storage is still a major issue.
To others, the mine tailings present an opportunity as an alternative building material or potentially even a carbon sink if there is a CO2 source nearby. Recent research shows that mine tailings can be processed to form supplementary cementitious materials (SCM) or geopolymers.
The mining industry recognises the prospect of turning mine tailings into value-added products, while also focusing on reducing tailings altogether.
“Increasing demand for metals critical to the energy transition, such as copper and nickel, will lead to greater production of mine waste like tailings under the current production processes. Alongside our members’ commitment to the safe management of their tailings facilities, ICMM’s goal is to significantly reduce or eliminate tailings. As part of this, we are working with members to make operations at their mine sites more circular by improving process efficiencies to reduce waste at its source, as well as creating value from waste such as tailings,” says Christian Spano, Director of Innovation, International Council on Mining and Metals (ICMM).
Reducing the use of the resource-intensive clinker in cement production is one of the technologies that will provide the largest cumulative CO2 reductions in the 2-degree Celsius Scenario (2DS), according to the International Energy Association. And with the urgency of climate change – no stone should be left unturned by the cement industry in its quest for CO2 saving – reusing mine tailings as a filler or an SCM can be an attractive business-case.
“As a leading supplier to both the cement and mining industry, FLSmidth is in a unique position to engage both parties to establish an efficient and commercially viable value chain for both industries,” says Petithuguenin – working closely with colleagues on both sides of the aisle to connect the dots. “The idea of using mine tailings in construction is not new, but the increasing need for sustainable SCMs is accelerating efforts to establish large-scale processes. In this work, which will include universities and experts from across different sectors, FLSmidth will use its vast process knowledge to optimise designs of the technology needed to produce a quality output.”
Concrete
Merlin Prime Spaces Acquires 13,185 Sq M Land Parcel In Pune
Rs 273 crore purchase broadens the developer’s Pune presence
Published
4 days agoon
March 6, 2026By
admin
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.
Concrete
Adani Cement and Naredco Partner to Promote Sustainable Construction
Collaboration to focus on skills, technology and greener practices
Published
4 days agoon
March 6, 2026By
admin
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.
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.
Merlin Prime Spaces Acquires 13,185 Sq M Land Parcel In Pune
Adani Cement and Naredco Partner to Promote Sustainable Construction
Operational Excellence Redefined!
World Cement Association Annual Conference 2026 in Bangkok
Assam Chief Minister Opens Star Cement Plant In Cachar
Merlin Prime Spaces Acquires 13,185 Sq M Land Parcel In Pune
Adani Cement and Naredco Partner to Promote Sustainable Construction
Operational Excellence Redefined!
World Cement Association Annual Conference 2026 in Bangkok


