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Cement Additives for Improved Grinding Efficiency

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In a two-part series, Consultant and Advisor Shreesh A Khadilkar, discusses how advanced additive formulations allow for customised, high-performance and niche cements.

Cement additives are chemicals (inorganic and organic) added in small amounts (0.01 per cent to 0.2 per cent by weight) during cement grinding. Their main job? Reduce agglomeration, prevent pack-set, and keep the mill running smoother. Thus, these additions primarily improve, mill thru-puts, achieve lower clinker factor in blended cements PPC/PSC/PCC. Additionally, these additives improve concrete performance of cements or even for specific special premium cements with special USPs like lower setting times or for reduced water permeability in the resultant cement mortars and concrete (water repellent /permeation resistant cements), corrosion resistance etc
The Cement additives are materials which could be further differentiated as:

Grinding aids

  • Bottlenecks in cement grinding capacity, such materials can enhance throughputs
  • Low specific electrical energy consumption during cement grinding
  • Reduce “Pack set” problem and improve powder flowability

Quality improvers

  • Opportunity for further clinker factor reduction
  • Solution for delayed cement setting or strength development issues at early or later ages.
  • Others: Materials which are used for specific special cements with niche properties as discussed in the subsequent pages.

When cement additives are used as grinding aids or quality improvers, in general the additives reduce the inter-particle forces; reduce coating over grinding media and mill internals. Due to creation of like charges on cement particles, there is decreased agglomeration, much improved flowability, higher generation of fines better dispersion of particles in separator feed and reduction of mill filling level (decrease of residence time). However, in VRM grinding; actions need to be taken to have stable bed formation on the table.
It has been reported in literature and also substantiated by a number of detailed evaluations of different cement additive formulations in market, that the cement additive formulations are a combination of different chemical compounds, composed of:
1. Accelerator/s for the hydration reaction of cements which are dependent on the acceleration effect desired in mortar compressive strengths at early or later ages, the choice of the materials is also dependent on clinker quality and blending components (flyash / slag) or a mix of both.
2. Water reducer / workability / wet-ability enhancer, which would show impact on the resultant cement mortars and concrete. Some of the compounds (retarders) like polysaccharide derivatives, gluconates etc., show an initial retarding action towards hydration which result in reducing the water requirements for the cements thus act as water reducers, or it could be some appropriate polymeric molecules which show improved wet-ability and reduce water demand. These are selected based on the mineral component and type of Cements (PPC/PSC /PCC).
3. Grinding aids: Compounds that work as Grinding Aid i.e. which would enhance Mill thru-put on one hand as well as would increase the early strengths due to the higher fines generation/ or activation of cement components. These compounds could be like alkanol-amines such as TIPA, DEIPA, TEA etc. or could be compounds like glycols and other poly-ols, depending on whether it is OPC or PPC or PSC or PCC manufacture.

Mechanism of action
1. Reduce Agglomeration ; Cement particles get electrostatically charged during grinding; stick together ; form “flocs” ; block mill efficiency ; waste energy. Grinding aid molecules adsorb onto particle surfaces ; neutralise charge ; prevent re-agglomeration.
2. Improve Powder Flowability; Adsorbed molecules create a lubricating layer; particles slide past each other easier ; better mill throughput ; less “dead zone” buildup.
;Also reduces caking on mill liners, diaphragms, and separator screens ; less downtime for cleaning.
3. Enhance Grinding Efficiency (Finer Product Faster) ; By preventing agglomeration, particles stay dispersed ; more surface area exposed to grinding media ? finer grind achieved with same energy input ; Or: same fineness achieved with less energy ; huge savings.

Example:

  • Without aid ? 3500 cm²/g Blaine needs 40 kWh/ton
  • With use of optimum grinding aid ? same fineness at 32 kWh/ton ? 20 per cent energy savings

4. Reduce Pack Set and Silo Caking, Grinding aids (GA) inhibit hydration of free lime (CaO) during storage ,  prevents premature hardening or “pack set” in silos. , especially critical in humid climates or with high free lime clinker.

It may be stated here that overdosing of GA , can cause: – Foaming in mill (especially with glycols) ? reduces grinding efficiency, retardation of cement setting (especially with amines/acids), odor issues (in indoor mills) – Corrosion of mill components (if acidic aids used improperly)
The best practice to optimise use of GA is , Start with 0.02 per cent to 0.05 per cent dosage , test fineness, flow, and set time , adjust up/down. Due to static charge of particles, the sample may stick to the sides of sampler pipe and so sampling need to be properly done.
Depending on type of Cements i.e. OPC, PPC, PSC, PCC, the grinding aids combinations need to be optimised, a typical Poly carboxylate ether also could be a part of the combo grinding aids

Cement additives for niche properties of the Cement in Concrete.
The cement additives can also be tailor made to create specific niche properties in Cements, OPC, PPC, PSC and PCC to create premium or special brands. The special niche properties of the cement being its additional USP of such cement products, and are useful for customers to build a durable concrete structure with increased service life.
Such properties could be:

  • Additives for improved Concrete performance of Cements, High early strength in PPC/PSC/PCC, much reduced water demand in cement, cements with improved slump retentivity in concrete, self-compacting, self levelling in concrete, cements with improved adhesion property of the cement mortar
  • Water repellence / water proofing, permeability resistance in Mortars and Concrete.
  • Biocidal cement
  • Photo catalytic cements
  • Cements with negligible ASR reactions etc.

Additives for cements for improved concrete performance
High early strengths: Use of Accelerators. These are chemical compounds which enhance the degree of hydration of cement. These can include setting or hardening accelerators depending on whether their action occurs in the plastic or hardened state respectively. Thus, the setting accelerators reduce the setting time, whereas the hardening accelerators increase the early age strengths. The setting accelerators act during the initial minutes of the cement hydration, whereas the hardening accelerators act mainly during the initial days of hydration.
Chloride salts are the best in class. However, use of chloride salts as hardening accelerators are strongly discouraged for their action in promoting the corrosion of rebar, thus, chloride-free accelerators are preferred. The hardening accelerators could be combinations of compounds like nitrate, nitrite and thiocyanate salts of alkali or alkaline earth metals or thiosulphate, formate, and alkanol amines depending on the cement types.
However, especially in blended Cements (PPC/PSC/PCC the increased early strengths invariably decrease the 28 Day Strengths. These aspects lead to creating combo additives along with organic polymers to achieve improved early strengths as well as either same or marginally improved 28 Days strengths with reduced clinker factor in the blended cement, special OPC with reduced admixture requirements. With use of appropriate combination of inorganic and organic additives we could create an OPC with substantially reduced water demand or improved slump retentivity. Use of such an OPC would show exceptional concrete performance in high grade concretes as it would exhibit lower admixture requirements in High Grade Concretes.
PPC with OPC like Properties: With the above concept we could have a PPC, having higher percentage flyash, with a combo cement additive which would have with concrete performance similar to OPC in say M40/M50 concrete. Such a PPC would produce a high-strength PPC concrete (= 60 MPa @ 28d) + Improved Workability, Durability and Sustainability.
Another interesting aspect could also be of using Ultrafine fine flyash /ultrafine slags as additions in OPC/PPC/PSC for achieving lower clinker factor as well as to achieve improved later age strengths with or without a combo cement additive.
The initial adhesion property at sites of especially PPC/PSC/PCC based mortars can be improved through use of appropriate organic polymers addition during the manufacture of these cements. Such Cements would have a better adhesion property for plastering/brick bonding etc., as it has much lower rebound loss of their Mortars in such applications.
It is needless to mention here that with use of additives, we could also have cement with viscosity modifying cement additives, for self-compaction and self-leveling concrete performance.
Use of Phosphogypsum retards the setting time of cements, we can use additive different additive combos to overcome retardation and improve the 1 day strengths of the cements and concretes.

The concluding part of this article will appear in the next issue of ICR.

About the author:
Shreesh Khadilkar, Consultant & Advisor, Former Director Quality & Product Development, ACC, a seasoned consultant and advisor, brings over 37 years of experience in cement manufacturing, having held leadership roles in R&D and product development at ACC Ltd. With deep expertise in innovative cement concepts, he is dedicated to sharing his knowledge and improving the performance of cement plants globally.

Concrete

Nuvoco Vistas, CleanMax Partner for Wind-Solar Hybrid Project in Rajasthan

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The project – comprising 20 MW of wind and 26.4 MWdc of solar capacity – will support Nuvoco’s cement operations with cleaner power while strengthening its renewable energy and decarbonisation strategy.

Mumbai, September 29, 2026

Nuvoco Vistas Corp Ltd, part of Nirma Group and one of India’s leading cement companies, has partnered with Clean Max Enviro Energy Solutions Limited (CleanMax), a renewable energy solutions provider for the commercial and industrial (C&I) sector, to develop a 46.4 MW wind-solar hybrid renewable energy project in Rajasthan.

The project will support Nuvoco’s cement operations with cleaner power while strengthening its renewable energy and decarbonisation strategy. It is expected to increase the share of renewable energy in Nuvoco’s power mix, reducing fossil fuel consumption and associated emissions.

Developed by CleanMax, an Independent Power Producer (IPP), at Bhikamkhore, Rajasthan, the project will comprise 20 MW of wind capacity and 26.4 MWdc of solar capacity, along with a 2-MWh Battery Energy Storage System (BESS). Power generated from the facility will be supplied to Nuvoco through the State Transmission Utility (STU) Open Access network.

The hybrid project is expected to generate approximately 100 million units (MU) of renewable electricity annually and help avoid around 1,25,485 tonnes of CO₂ emissions every year across Scope 1 and Scope 2 emissions.

The initiative supports Nuvoco’s ongoing efforts to reduce the carbon intensity of its manufacturing operations through renewable energy adoption, Waste Heat Recovery Systems (WHRS), energy-efficiency measures and increased use of alternative fuels. It also aligns with the company’s DIRE (Digitalisation, Innovation and Renewables) agenda, which focuses on climate action, renewable energy transition, water stewardship, circularity and biodiversity conservation across its manufacturing ecosystem.

Commenting on the initiative, Jayakumar Krishnaswamy, Managing Director, Nuvoco Vistas Corp Ltd, said, “This marks an important step in advancing Nuvoco’s journey towards more sustainable and resilient operations. Our collaboration with CleanMax will increase the share of renewable energy across our Rajasthan operations, strengthening our energy mix while improving long-term cost efficiency and reducing our dependence on conventional power sources. Initiatives such as these reinforce our commitment to operational excellence and responsible growth, while supporting our vision of Building a Safer, Smarter and Sustainable World.”

Kuldeep Jain, Founder and Managing Director, CleanMax, said, “Cement plants run continuously, so the power behind them has to be dependable for decades, not years. We’re seeing manufacturing industries view clean energy as an integral part of their core operations and long-term strategy. Our partnership with Nuvoco reflects that shift, and we’re pleased to support its decarbonisation journey. This wind-solar hybrid project is designed to deliver long-term cost certainty while supporting the Company’s transition to cleaner power.”

Nuvoco has been advancing its sustainability initiatives through renewable energy, operational efficiency and technology-driven solutions. The company operates across Cement, Ready-Mix Concrete (RMX) and Modern Building Materials (MBM) segments, with a presence across East, North and West India.

The company began operations in 2014 with a greenfield cement plant in Nimbol, Rajasthan, and later acquired Lafarge India Limited, which entered India in 1999, along with Emami Cement Ltd in 2020 and Vadraj Cement Limited in April 2025. With planned expansion initiatives, including a new grinding mill at the Arasmeta Cement Plant and multiple debottlenecking projects, Nuvoco aims to achieve a cement capacity of 35 MMTPA.

The company reported total income of Rs 113.62 billion in FY 2025-26, reflecting its continued growth trajectory. Its cement portfolio includes Concreto, Duraguard, Double Bull, PSC, Nirmax and Infracem brands, while its RMX business offers products under Concreto, Artiste, InstaMix, X-Con and Ecodure brands. Nuvoco also provides construction solutions under its Zero M range of modern building materials.

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Concrete

UltraTech Cement achieves 100% green energy milestone at Chhattisgarh plant

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UltraTech Cement’s Kukurdih Works becomes its first integrated unit to meet 100 per cent electricity needs through green energy every month.

Raipur (Chhattisgarh)

UltraTech Cement Limited, the world’s largest cement company outside China, has achieved a significant decarbonisation milestone, with its Kukurdih Cement Works integrated unit in Chhattisgarh meeting 100 per cent of its electricity requirement through green energy every month since April 2026.

Commissioned in 2024, Kukurdih Cement Works has an installed grey cement capacity of 3.3 million tonnes per annum. The unit achieved this milestone through a combination of renewable power sourcing and Waste Heat Recovery Systems (WHRS), which now collectively meet its entire electricity demand while ensuring operational reliability.

Since April 2026, nearly one-third of UltraTech’s 76 manufacturing units in India have maintained green energy utilisation above 50 per cent of their electricity requirements. Five units, including Kukurdih, have exceeded 95 per cent green energy utilisation. The company is also progressively deploying Battery Energy Storage Systems (BESS) across its network to enable deeper renewable energy integration.

As part of its decarbonisation strategy, UltraTech has not invested in additional captive thermal power capacity for greenfield projects or brownfield expansions at its integrated units for over a decade.

As of Q1FY27, the company’s captive green energy capacity stood at 1,897 MW, comprising 1,463 MW of renewable energy capacity from solar, wind and hybrid sources, along with 434 MW of WHRS capacity. Under its RE100 commitment, UltraTech aims to increase the share of green power in its total energy mix to 85 per cent by 2030 and achieve 100 per cent by 2050.

UltraTech Cement Ltd, the cement flagship company of the Aditya Birla Group, is a $10-billion building solutions company and the largest cement producer globally by sales volume outside China. The company has a total grey cement capacity of 210.1 MTPA and white cement/putty capacity of 3.5 MTPA. It is a signatory to the GCCA Climate Ambition 2050 and has committed to the Net Zero Concrete roadmap announced by GCCA.

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Economy & Market

From First Mile to Last Mile

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Praveen Vashistha, Founder, Gxpress Solutions, speaks about building a holistic logistics network that encompasses latest technology and current challenges faced by logistics service providers.

Logistics may seem to only entail transporting a package from one location to another. However, there is more to this term than just that. Logistics refers to the entire process of controlling all movement, transfers and decisions in the correct way at the right time and cost and with the desired level of visibility.

People nowadays want to receive more than just the delivery. They want quick, efficient, reliable and transparent logistics service. On the other hand, companies are facing higher operating costs, broken supply chains, congested cities, changing habits of consumers and growing complexity of logistics services. In this situation, a full logistics package is gaining importance not only as a competitive advantage but also as a necessity for a successful business.

The main challenge lies in uniting the first mile, the middle mile and the last mile into one seamless process.

The journey begins before the package moves

First-mile logistics may be the least recognised part of the logistics chain, but they have a crucial influence on all that follows.

This stage starts from the moment the shipment leaves the manufacturer, supplier, farm, warehouse or distribution centre. Depending on the industry, first-mile logistics may involve grouping shipments from multiple suppliers, compiling paperwork and checking the inventory before sending the shipments to a central hub.

Flaws in first-mile logistics produce effects later down the supply chain. Delays in cargo pickup can affect warehouse operations; improper packaging can damage goods in transit; and incorrect inventory information may cause stockholding or unnecessary replenishments.

This is why building a reliable network involves simplifying the operations done at the beginning of the supply chain.

Companies require accurate demand forecasts, supplier visibility, standard procedures, and software to capture information from the moment a shipment enters the supply chain. Route planning and fleet management are also important at this stage, especially as it may involve contacting multiple suppliers.

The main goal is simply to make the first mile predictable.

The middle mile: Where scale meets complexity

When products leave the original site, they travel through the ‘middle mile,’ which connects fulfilment centres, warehouses, sorting centres, and regional distribution points. In this phase, logistics networks begin operating on a large scale. A shipment can pass through several facilities before reaching the final destination. Each additional transfer entails the risk of delay or damage and information losses. Accordingly, the ideal solution is not to minimise the number of transfers but rather to optimise them. The use of hub-and-spoke networks, regional distribution centres, and strategically placed distribution centres can help companies shorten transportation routes and optimise distribution costs. Besides, data can be used to determine the optimal placement of inventories.

For instance, a retailer may find that it takes more time and is more expensive to deliver goods to customers if everything is stored in a central warehouse. Meanwhile, regional distribution helps meet the customer’s needs quicker and more efficiently.

The last mile is where the customer judges you

When it comes to the logistics experience, the customer experience comes down to the delivery. While the last mile might comprise a small part of the entire journey in actual distance, it could also entail expensive and difficult processes. Delivery runs through densely populated cities, through traffic jams, through unsuccessful delivery attempts, and through changing consumer preferences and narrowed time frames.

Customers want to have control over their delivery. Delivery means that customers expect to know the exact moment when their order is delivered. They need to receive current updates about their orders and the ability to decide whether they want scheduled deliveries, or whether they want their order to be dropped off at a designated location far from their house.

As a result, last-mile logistics must incorporate both efficiency and experience. The technology may be used to ensure timely and accurate delivery, through such products as route optimisation and real-time delivery tracking.

However, technology is not enough to guarantee success in terms of last-mile delivery. Knowledge of the local area is still an important aspect that contributes to successful delivery.

One network, not three separate operations

First, the common mistake that organisations can make is treating the first mile, the middle, and the last mile separately.

An effective first mile of logistics does not matter much if the shipment waits in a hub for many hours. A perfectly working warehouse does not make a happy customer if the last-mile delivery fails. Therefore, even the fastest last-mile delivery can become an expensive operation if the supply is not well geographically positioned.

The three moments should work together as one whole system.

This implies having a common view on inventory, transport capacities, shipment statuses and demand. The Transportation Management System, Warehouse Management System and order management system should give information to each other instead of acting like separate islands.

That is where real-time information comes into play!

If something happens, such as a vehicle gets delayed, the company has to know that from the start. If not, someone from Customer Service should be informed about the situation.

Visibility is the new infrastructure

Previously, companies had to rely on physical assets, such as warehouses, trucks, and sorting facilities, to create their logistics networks. Today, they have an additional layer of technology providing visibility.

Command-and-control systems now include GPS tracking, Internet of Things devices, bar-coding, RFID, cloud computing, artificial intelligence, and analytics, which allow companies to know what the goods are doing, how well they are doing, and what is going to happen next.

Predictive analytics reveal possible delays. AI-powered forecasting increases availability. Digital dashboards enable the manager to monitor all operations in one place. The efficiency of such technologies is not measured in the amount of information they gather, but rather in their capability of converting data into knowledge.

Logistics managers should be able to answer the following questions: Where is it? When is it supposed to arrive? What causes the delay? What impact does it have? Can it be delivered some other way? How much will it cost?

The sooner the answers are given, the more resilient the logistics system is.

Resilience must be designed into the network

The events of recent years have highlighted the vulnerability of interconnected supply chains. Geopolitical tensions, bad weather, a lack of labour, poorly developed infrastructure and an unexpected spike in demand are some events that can cause problems for logistics systems without prior notice. Thus, companies should create an end-to-end network not just for normal times but also capable of functioning quickly in problematic situations. In order to create such a network, it is necessary to find alternative suppliers, use several means of transportation, create several routes of delivery, and establish inventory. It is also important to use scenario planning to define what to do if the main hub becomes unavailable or any means of transportation is blocked.

Sustainability: Part of the delivery equation

The future of logistics will also be shaped by environmental considerations.

As delivery volumes rise, businesses are under increasing pressure to reduce emissions without compromising service. Better route planning, load optimisation, electric vehicles, alternative fuels, renewable-energy-powered warehouses and consolidated deliveries can all contribute. The most sustainable shipment is often the one that does not require unnecessary movement in the first place.

Better demand forecasting and inventory placement can reduce empty miles and avoid repeated transportation. Consolidating deliveries can improve vehicle utilisation. Reverse logistics can ensure that products, packaging and materials return efficiently instead of becoming waste.

Sustainability, therefore, should not be treated as a separate initiative. It should be incorporated into network design itself.

The future belongs to connected logistics

An end-to-end logistics network ultimately seeks to close existing gaps between various processes.

Every mile of the process should be interconnected with the other miles. Warehouses should be aware of the restraints imposed by transportation. Delivery crews should be able to know at every moment the inventory at their disposal. Clients must have access to this useful information.

Companies that will be successful in this area will not necessarily be the ones with the biggest fleets or the most warehouses. They will simply be the ones that can employ their resources in the most effective manner.

The future of logistics will be represented by an ecosystem consisting of the combination of the physical aspect, digital intelligence, and personnel decisions. Every mile in the process of delivery is important. However, the key advantage here is getting those miles to work together.

For companies, it means having minimal resistance, enhancing their efficiency and improving customer care. For clients, it means simply having the right product delivered at the right time.

About the author: Praveen Vashistha, Founder, Gxpress Solutions,

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