Economy & Market
Logistics: A cost-effective approach
Published
15 years agoon
By
admin
With the industry showing a downward trend in profit margins, better logistics management proves beneficial to many of the cement manufacturers. Nitin Madkaikar, Economist, FirstInfo Centre, explores the various modes of logistics that can provide a cost-effective means of cement transportation.
Cement, being a bulk commodity, transporting is a costly affair. The selling and distribution costs account for around 18 per cent of sales revenues. In 2009-10, top 30 cement companies spent more than Rs 10,000 crore to carry cement to the consumer. The domestic cement industry has been making continuous efforts to cut its logistic costs.
At the time when the industry was entering into the downside of the cycle, with profit margins coming down to 20-25 per cent from 35-40 per cent, better logistics management proved beneficial to many of the cement manufacturers. Using more railway routes than roads, shrinking lead distance (distance between the manufacturing facility and market) and opting for sea-routes wherever possible were some of the ways the industry explored. Currently, for every 50-kg bag of cement, the logistic cost comes to around Rs 18-25 by road and Rs 12-15 by the railway, depending on the distance. For example, the country’s third-largest cement maker, Ambuja Cements, opted for sea-routes to transport its cement from Gujarat to southern market.
Today, 70 per cent of the cement movement worldwide is by sea compared to just 1-2 per cent in India. However, the scenario is changing with most of the big players like L&T, ACC and Grasim having set up their bulk terminals.
About 3 per cent of the gross revenue is spent on inward logistics while outward logistics accounts for another bulk of 15 per cent. Inward logistics include, coal and limestone transportation, while outward logistics is mostly the final product cement. Some companies also incur outbound logistics cost on transporting clinker to their grinding plants. Plants that are closer to the collieries, the inbound transportation costs are less. For plants located far away from the collieries they have the option to import coal.
While the freight cost could be optimised on the imported coal through usage of company’s own ships for part of the quantity, the international prices of imported coal and its volatility together with the strengthening of the dollar against rupee could derail this. This could impact the delivery prices of imported coal and also the cost of production.
In case of final product, the costs of handling and secondary movement are very high. Although transportation by sea is the cheapest option, unless there is right connectivity from the port to the consuming centre the gains are minimum.
Companies, which have plants located closer to the markets as well as to the source of raw materials have an advantage over their peers, as this leads to lower freight costs. Also, plants located in coastal belts find it much cheaper to transport cement by the sea route in order to cater to the coastal markets such as Mumbai and the states of Gujarat and Tamil Nadu.
Checking logistics costs is an ongoing process for the cement companies. Many are trying to reduce the costs by around 5-7 per cent by optimising the distance of transport. Statistics suggest that about 45 per cent of the cement produced in the country is being transported by the railway. Cement makers prefer roads for shorter distances.
Looking ahead
With demand for cement expected to remain strong in 2011 with a growth of over 10 per cent, the logistic activities are in for a boom. In the 2011-12 fiscal, additional cement capacity of 27 million tonne is likely to go on stream. With the bulk of the capacities coming up in the South, the demand supply imbalance in 2011 would continue to be a cause of concern in the South, though it is expected to improve or remain in a status quo position in other regions.
The dwindling availability of coal linkage and the move to sell high grade indigenous coal at international prices are likely to impact power and fuel costs. The prices of other major inputs mainly slag, gypsum and fly ash are likely to further harden in 2011, whilst the increase in petroleum product prices would continue to impact freight costs. A shortage in railway wagon availability may adversely impact despatches in peak months.
The Indian cement industry is the second largest in the world after China, with a total capacity of close to 300 million tonne and plays a major role in the development of the Nation. Therefore, considering the role of Industry in the economy’s development, it is necessary to incentivise bulk transportation and thereby optimize cost, save fuel and reducing carbon emission while ensuring safe carriage.
Railways to levy surcharge
Indian Railways will levy a surcharge of up to 7 per cent from 1 April to earn a higher freight earning during busy season. The move is likely to add to the inflationary pressure on the economy even as finance ministry is expecting a lower inflation during 2011-12.
As per the railway decision, a surcharge of 5 per cent will be charged on coal and coke group, while all other commodities will attract a busy season charge of 7 per cent. Container traffic has been exempt from any such charge. Railway considers the entire year barring July-September of every year as busy period.
In 2010-11 also, railways had increased freight rates of iron ore, coal, sugar, cement, steel, potash, coke and some petroleum products.
Railways has also decided to levy a congestion charge of flat 20 per cent on traffic to neighbouring Bangladesh and Pakistan. The measure has been taken to encourage faster clearance of rakes at the borders.
Logistics cost reduction cannot be the sole objective and seen in isolation by the cement industry. The most important part is the service. At the end of the day, if one is unable to serve the customer he will never be in the industry. – Rajeev Mehta
How do you evaluate logistics in cement industry?
Logistics costs are going to come down provided one is on the right track. If he chases cost in isolation by just working in cost reduction, he cannot reduce cost in an inflationary world. The process of cost negotiations of olden days are over now. Under negotiation, one arrived only at the lowest quoted price and was content assumingly to have reduced the cost. Here, he only arrives at the best negotiated prices but not at a best cost. Today the concept of negotiation is no more prevalent. If one wants to work the truck freight to a particular destination, the right cost should take into account all the statutory duties, all the toll taxes, fuel cost, and all other allied cost, cost of vehicles, turnaround efficiency, everything. These known efficiency parameters should be arrived at the right price. Here the cost can be reduced only by increasing the efficiency.
The second most important factor is to use technology to the helm. The real time visibility is the key to success. Through technology one can find whether the truck is detained, which route is appropriate, entry restriction, etc. Technology plays a key role in aligning these activities.
What are functional bottlenecks?
In the old system, the key was to have a godown and the evacuation quantity used to be very small. Today one rack carry 3,800 metric tonne as against 1,700 to 1,800 metric tonne earlier. Now the size has almost doubled. Unfortunately in India, evacuation resources have not kept pace with the requirement. Most goods sheds are under control of the union, the fleet size has not expanded as per the growth of the cement business, labour is controlled by the union, labour availability has not increased as per the increment in volumes.
There is no mechanisation process in India, in spite of the wishes of the industry. Here the government has to play an active role. Industry on its own cannot make mechanisation happen. It should be a collaborative effort. Mechanisation, in the short run will create turbulence, but in the long run everybody will be benefitted. People need to be educated and prepared to face these short term turbulences.
What is your estimate of losses due to prevalent evacuation system
Mechanisation can alone reduce cost by a minimum of 10 per cent. The company could currently evacuate 3,000 tonne by manual route from goods shed, just because systems are not mechanised. Going ahead, labour in India will become a scare commodity, so one should be prepared for such eventuality in 2015-2020. The industry will have to join hands and take up a pilot project. It has to be a collaborative effort.
This has driven the logistics to almost 15 per cent of total cost which is very high by global standards given the volumes.
Logistics cost in India is going to come down a) efficiency b) technology is the key c) mechanisation is another area d) last but not the least, people should know the right cost. There has to be organised movement of transport. Every truck coming to Mumbai should log-in at the octroi point, when they are going back from Mumbai and in which destination they want to go. Those people who want to send material to that location can also log-in. So it can be marriage of both, need business and who are willing to give business. Today only brokers are there in this field. They are making money by non-visibility of information. That cost of brokers is unnecessarily borne by the company and the end-user. Make a transportation where every information is visible. Let people log-in and say we are interested in transporting our good.
Railways haul about 40 per cent of cement, what are the bottlenecks there?
Railways has very good system, which gives real time visibility. On technology front, the railways has done a great job. Per se, for any bottleneck railways cannot be blamed. It continues to be a socialistic set-up and at the pace at which the economy is growing the railways has limited resources. Railways have increased the number of trains but where are the tracks. This has to move parallel. Every year railways add 100 of passenger and goods trains, running on the same track. It is not railway that is slow it is a general problem in the country. The time taken to conceive a project and to execute that project is huge.
What are the inwards and outwards logistics, the cost proportion?
In cement industry, inward logistics costs are about three per cent of gross revenue and outbound close to 15 per cent. Clinker going to grinder it is outward.
What are preferred modes of transportation of cement?
Roads are cheaper up to a lead of 300 km, over which it is railways. Sea route is the most economical. But in India sea route is viable only on the west coast, where limestone and markets, both are available. On the east cost the problem is that the regions does not have limestone. In Gujarat limestone is available bang on the coast. Sea route is economical but not available across.
What are the new challenges in road transport?
The toll taxes are a concern now on roads. There has been a progressive increase in the toll rates and the number of points. On a stretch on 200 km there a 5-6 toll points, which hinders speed. This has resulted in increased cost and time. There is an urgent need for high tech toll booths.
What is the focus on logistics going ahead?
Every industry has its own efficiency levels and are trying to address them in different ways. In cement, per se, volumes have gone up and in spite of all these limitations the thrust is to move towards better services.
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Concrete
Refractory demands in our kiln have changed
Published
1 week agoon
February 20, 2026By
admin
Radha Singh, Senior Manager (P&Q), Shree Digvijay Cement, points out why performance, predictability and life-cycle value now matter more than routine replacement in cement kilns.
As Indian cement plants push for higher throughput, increased alternative fuel usage and tighter shutdown cycles, refractory performance in kilns and pyro-processing systems is under growing pressure. In this interview, Radha Singh, Senior Manager (P&Q), Shree Digvijay Cement, shares how refractory demands have evolved on the ground and how smarter digital monitoring is improving kiln stability, uptime and clinker quality.
How have refractory demands changed in your kiln and pyro-processing line over the last five years?
Over the last five years, refractory demands in our kiln and pyro line have changed. Earlier, the focus was mostly on standard grades and routine shutdown-based replacement. But now, because of higher production loads, more alternative fuels and raw materials (AFR) usage and greater temperature variation, the expectation from refractory has increased.
In our own case, the current kiln refractory has already completed around 1.5 years, which itself shows how much more we now rely on materials that can handle thermal shock, alkali attack and coating fluctuations. We have moved towards more stable, high-performance linings so that we don’t have to enter the kiln frequently for repairs.
Overall, the shift has been from just ‘installation and run’ to selecting refractories that give longer life, better coating behaviour and more predictable performance under tougher operating conditions.
What are the biggest refractory challenges in the preheater, calciner and cooler zones?
• Preheater: Coating instability, chloride/sulphur cycles and brick erosion.
• Calciner: AFR firing, thermal shock and alkali infiltration.
• Cooler: Severe abrasion, red-river formation and mechanical stress on linings.
Overall, the biggest challenge is maintaining lining stability under highly variable operating conditions.
How do you evaluate and select refractory partners for long-term performance?
In real plant conditions, we don’t select a refractory partner just by looking at price. First, we see their past performance in similar kilns and whether their material has actually survived our operating conditions. We also check how strong their technical support is during shutdowns, because installation quality matters as much as the material itself.
Another key point is how quickly they respond during breakdowns or hot spots. A good partner should be available on short notice. We also look at their failure analysis capability, whether they can explain why a lining failed and suggest improvements.
On top of this, we review the life they delivered in the last few campaigns, their supply reliability and their willingness to offer plant-specific custom solutions instead of generic grades. Only a partner who supports us throughout the life cycle, which includes selection, installation, monitoring and post-failure analysis, fits our long-term requirement.
Can you share a recent example where better refractory selection improved uptime or clinker quality?
Recently, we upgraded to a high-abrasion basic brick at the kiln outlet. Earlier we had frequent chipping and coating loss. With the new lining, thermal stability improved and the coating became much more stable. As a result, our shutdown interval increased and clinker quality remained more consistent. It had a direct impact on our uptime.
How is increased AFR use affecting refractory behaviour?
Increased AFR use is definitely putting more stress on the refractory. The biggest issue we see daily is the rise in chlorine, alkalis and volatiles, which directly attack the lining, especially in the calciner and kiln inlet. AFR firing is also not as stable as conventional fuel, so we face frequent temperature fluctuations, which cause more thermal shock and small cracks in the lining.
Another real problem is coating instability. Some days the coating builds too fast, other days it suddenly drops, and both conditions impact refractory life. We also notice more dust circulation and buildup inside the calciner whenever the AFR mix changes, which again increases erosion.
Because of these practical issues, we have started relying more on alkali-resistant, low-porosity and better thermal shock–resistant materials to handle the additional stress coming from AFR.
What role does digital monitoring or thermal profiling play in your refractory strategy?
Digital tools like kiln shell scanners, IR imaging and thermal profiling help us detect weakening areas much earlier. This reduces unplanned shutdowns, helps identify hotspots accurately and allows us to replace only the critical sections. Overall, our maintenance has shifted from reactive to predictive, improving lining life significantly.
How do you balance cost, durability and installation speed during refractory shutdowns?
We focus on three points:
• Material quality that suits our thermal profile and chemistry.
• Installation speed, in fast turnarounds, we prefer monolithic.
• Life-cycle cost—the cheapest material is not the most economical. We look at durability, future downtime and total cost of ownership.
This balance ensures reliable performance without unnecessary expenditure.
What refractory or pyro-processing innovations could transform Indian cement operations?
Some promising developments include:
• High-performance, low-porosity and nano-bonded refractories
• Precast modular linings to drastically reduce shutdown time
• AI-driven kiln thermal analytics
• Advanced coating management solutions
• More AFR-compatible refractory mixes
These innovations can significantly improve kiln stability, efficiency and maintenance planning across the industry.
Concrete
Digital supply chain visibility is critical
Published
1 week agoon
February 20, 2026By
admin
MSR Kali Prasad, Chief Digital and Information Officer, Shree Cement, discusses how data, discipline and scale are turning Industry 4.0 into everyday business reality.
Over the past five years, digitalisation in Indian cement manufacturing has moved decisively beyond experimentation. Today, it is a strategic lever for cost control, operational resilience and sustainability. In this interview, MSR Kali Prasad, Chief Digital and Information Officer, Shree Cement, explains how integrated digital foundations, advanced analytics and real-time visibility are helping deliver measurable business outcomes.
How has digitalisation moved from pilot projects to core strategy in Indian cement manufacturing over the past five years?
Digitalisation in Indian cement has evolved from isolated pilot initiatives into a core business strategy because outcomes are now measurable, repeatable and scalable. The key shift has been the move away from standalone solutions toward an integrated digital foundation built on standardised processes, governed data and enterprise platforms that can be deployed consistently across plants and functions.
At Shree Cement, this transition has been very pragmatic. The early phase focused on visibility through dashboards, reporting, and digitisation of critical workflows. Over time, this has progressed into enterprise-level analytics and decision support across manufacturing and the supply chain,
with clear outcomes in cost optimisation, margin protection and revenue improvement through enhanced customer experience.
Equally important, digital is no longer the responsibility of a single function. It is embedded into day-to-day operations across planning, production, maintenance, despatch and customer servicing, supported by enterprise systems, Industrial Internet of Things (IIoT) data platforms, and a structured approach to change management.
Which digital interventions are delivering the highest ROI across mining, production and logistics today?
In a capital- and cost-intensive sector like cement, the highest returns come from digital interventions that directly reduce unit costs or unlock latent capacity without significant capex.
Supply chain and planning (advanced analytics): Tools for demand forecasting, S&OP, network optimisation and scheduling deliver strong returns by lowering logistics costs, improving service levels, and aligning production with demand in a fragmented and regionally diverse market.
Mining (fleet and productivity analytics): Data-led mine planning, fleet analytics, despatch discipline, and idle-time reduction improve fuel efficiency and equipment utilisation, generating meaningful savings in a cost-heavy operation.
Manufacturing (APC and process analytics): Advanced Process Control, mill optimisation, and variability reduction improve thermal and electrical efficiency, stabilise quality and reduce rework and unplanned stoppages.
Customer experience and revenue enablement (digital platforms): Dealer and retailer apps, order visibility and digitally enabled technical services improve ease of doing business and responsiveness. We are also empowering channel partners with transparent, real-time information on schemes, including eligibility, utilisation status and actionable recommendations, which improves channel satisfaction and market execution while supporting revenue growth.
Overall, while Artificial Intelligence (AI) and IIoT are powerful enablers, it is advanced analytics anchored in strong processes that typically delivers the fastest and most reliable ROI.
How is real-time data helping plants shift from reactive maintenance to predictive and prescriptive operations?
Real-time and near real-time data is driving a more proactive and disciplined maintenance culture, beginning with visibility and progressively moving toward prediction and prescription.
At Shree Cement, we have implemented a robust SAP Plant Maintenance framework to standardise maintenance workflows. This is complemented by IIoT-driven condition monitoring, ensuring consistent capture of equipment health indicators such as vibration, temperature, load, operating patterns and alarms.
Real-time visibility enables early detection of abnormal conditions, allowing teams to intervene before failures occur. As data quality improves and failure histories become structured, predictive models can anticipate likely failure modes and recommend timely interventions, improving MTBF and reducing downtime. Over time, these insights will evolve into prescriptive actions, including spares readiness, maintenance scheduling, and operating parameter adjustments, enabling reliability optimisation with minimal disruption.
A critical success factor is adoption. Predictive insights deliver value only when they are embedded into daily workflows, roles and accountability structures. Without this, they remain insights without action.
In a cost-sensitive market like India, how do cement companies balance digital investment with price competitiveness?
In India’s intensely competitive cement market, digital investments must be tightly linked to tangible business outcomes, particularly cost reduction, service improvement, and faster decision-making.
This balance is achieved by prioritising high-impact use cases such as planning efficiency, logistics optimisation, asset reliability, and process stability, all of which typically deliver quick payback. Equally important is building scalable and governed digital foundations that reduce the marginal cost of rolling out new use cases across plants.
Digitally enabled order management, live despatch visibility, and channel partner platforms also improve customer centricity while controlling cost-to-serve, allowing service levels to improve without proportionate increases in headcount or overheads.
In essence, the most effective digital investments do not add cost. They protect margins by reducing variability, improving planning accuracy, and strengthening execution discipline.
How is digitalisation enabling measurable reductions in energy consumption, emissions, and overall carbon footprint?
Digitalisation plays a pivotal role in improving energy efficiency, reducing emissions and lowering overall carbon intensity.
Real-time monitoring and analytics enable near real-time tracking of energy consumption and critical operating parameters, allowing inefficiencies to be identified quickly and corrective actions to be implemented. Centralised data consolidation across plants enables benchmarking, accelerates best-practice adoption, and drives consistent improvements in energy performance.
Improved asset reliability through predictive maintenance reduces unplanned downtime and process instability, directly lowering energy losses. Digital platforms also support more effective planning and control of renewable energy sources and waste heat recovery systems, reducing dependence on fossil fuels.
Most importantly, digitalisation enables sustainability progress to be tracked with greater accuracy and consistency, supporting long-term ESG commitments.
What role does digital supply chain visibility play in managing demand volatility and regional market dynamics in India?
Digital supply chain visibility is critical in India, where demand is highly regional, seasonality is pronounced, and logistics constraints can shift rapidly.
At Shree Cement, planning operates across multiple horizons. Annual planning focuses on capacity, network footprint and medium-term demand. Monthly S&OP aligns demand, production and logistics, while daily scheduling drives execution-level decisions on despatch, sourcing and prioritisation.
As digital maturity increases, this structure is being augmented by central command-and-control capabilities that manage exceptions such as plant constraints, demand spikes, route disruptions and order prioritisation. Planning is also shifting from aggregated averages to granular, cost-to-serve and exception-based decision-making, improving responsiveness, lowering logistics costs and strengthening service reliability.
How prepared is the current workforce for Industry 4.0, and what reskilling strategies are proving most effective?
Workforce preparedness for Industry 4.0 is improving, though the primary challenge lies in scaling capabilities consistently across diverse roles.
The most effective approach is to define capability requirements by role and tailor enablement accordingly. Senior leadership focuses on digital literacy for governance, investment prioritisation, and value tracking. Middle management is enabled to use analytics for execution discipline and adoption. Frontline sales and service teams benefit from
mobile-first tools and KPI-driven workflows, while shop-floor and plant teams focus on data-driven operations, APC usage, maintenance discipline, safety and quality routines.
Personalised, role-based learning paths, supported by on-ground champions and a clear articulation of practical benefits, drive adoption far more effectively than generic training programmes.
Which emerging digital technologies will fundamentally reshape cement manufacturing in the next decade?
AI and GenAI are expected to have the most significant impact, particularly when combined with connected operations and disciplined processes.
Key technologies likely to reshape the sector include GenAI and agentic AI for faster root-cause analysis, knowledge access, and standardisation of best practices; industrial foundation models that learn patterns across large sensor datasets; digital twins that allow simulation of process changes before implementation; and increasingly autonomous control systems that integrate sensors, AI, and APC to maintain stability with minimal manual intervention.
Over time, this will enable more centralised monitoring and management of plant operations, supported by strong processes, training and capability-building.
Concrete
Cement Additives for Improved Grinding Efficiency
Published
1 week agoon
February 20, 2026By
admin
Shreesh A Khadilkar discusses how advanced additive formulations allow customised, high-performance and niche cements—offering benefits while supporting blended cements and long-term cost and carbon reduction.
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, typically composed of:
- 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.
- 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).
- 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 — Step By Step—
- 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.
- 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. - 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 - 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.
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.
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