Economy & Market
The Code on Wages 2019: Impact on cost to company
Published
5 years agoon
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admin
The Code on Wages, 2019 has defined ??ages??in great detail. The same definition is quoted in the subsequent three labour codes passed by Parliament in 2020. According to Section 2 (y) of the code, ??ages” mean the entire remuneration paid to an employee while in employment and include: (i) basic pay; (ii) dearness allowance; and (iii) retaining allowance, if any.
However, ??ages??do not include:
(a) any bonus payable under any law for the time being in force, which does not form part of the remuneration payable under the terms of employment;
(b) the value of any house-accommodation, or of the supply of light, water, medical attendance or other amenity or of any service excluded from the computation of wages by a general or special order of the appropriate government;
(c) any contribution paid by the employer to any pension or provident fund, and the interest which may have accrued thereon;
(d) any conveyance allowance or the value of any travelling concession;
(e) any sum paid to the employed person to defray special expenses entailed on him by the nature of his employment;
(f) house rent allowance;
(g) remuneration payable under any award or settlement between the parties or order of a court or tribunal;
(h) any overtime allowance;
(i) any commission payable to the employee;
(j) any gratuity payable on the termination of employment;
(k) any retrenchment compensation or other retirement benefit payable to the employee or any ex-gratia payment made to him on the termination of employment.
However again, for calculating the ??ages??under this clause, if payments made by the employer to the employee under clauses (a) to (i) exceed one-half, or such other per cent as may be notified by the central government, of all the remuneration calculated under this clause, the amount which exceeds such one-half, or the per cent so notified, shall be deemed as remuneration and shall accordingly be added to the ??ages??under this clause.
This clause defines ??ages??as consisting of the basic pay, the dearness allowance and the retaining allowance if any. However, if these three components were to add up to less than 50 per cent of the total defined remuneration, then the 50 per cent figure arrived at will be regarded as ??ages??
Following the enactment of the Code on Wages, 2019, four existing Acts stand repealed. The concerned acts are: The Payment of Wages Act, 1936, The Minimum Wages Act, 1948, The Payment of Bonus Act, 1965 and The Equal Remuneration Act, 1976.
The Code on Wages, 2019 is applicable to all the employees of every establishment. This means the code applies not only to workers but to the supervisors and executives as well. The new definition of ??ages??will ensure that the minimum wages as prescribed by the the Government from time to time would strictly be complied with, while eliminating the scope for reducing the contribution to terminal benefits, because of the bifurcation method applied by employers in the past. Admittedly, once the code becomes operational, the new definition of ??ages??is likely to add to the financial burdens of several companies.
Evolution of wage structure with allowances
When I commenced my corporate career in 1970 as an Assistant Engineer with Mukand Iron & Steel Works (now called Mukand), there was nothing like the concept of cost to company (CTC). The appointment letter given to me merely carried details of the monthly basic pay, the Grade in which I was placed, and the annual increment applicable to that grade. There was also mention about the monthly dearness allowance that I would receive based on the consumer price index. In my first payslip, the total of these two items ??basic pay and dearness allowance ??amounted to a princely sum of Rs 1,050 per month.
No other allowances were payable to me, either monthly or annually, during the first two years of my service, except the annual bonus declared by the company before Diwali based on the earnings for the previous year. This pattern of monthly wages continued largely in the same manner as I moved up the organisational hierarchy by way of promotion, as well as movement from one organisation to another in my corporate career. Just to reiterate, the basic pay and for certain years the Dearness Allowance continued to be the most important components of my monthly remuneration.
In India, the concept of CTC had its origins in the information technology (IT) companies from around mid-1980??. Alongside, consulting firms began to undertake surveys of executive remuneration for providing a comparative picture of a company?? standing in respect of its compensation levels and for determination of industry wise benchmarks. Some select companies formed remuneration clubs for similar purposes, primarily for exchange of salary details and compensation practices. These new developments necessitated having to assign cash value to perquisites extended to executives especially in multinational companies. Later, when the income tax rates were rationalised and the tax-free perquisites came up for scrutiny, companies began to treat all items of compensation as taxable. This automatically led to the legitimisation of the concept of CTC.
Simultaneously, there were other developments. The practice of including dearness allowance in the monthly salary of executives was abandoned by most companies. Also, in negotiations of long-term wage settlements with trade unions, organisations tried to introduce new allowances. This was done mainly to limit the rise in basic pay and monthly dearness allowance, as these two items had an impact on several other payments such as overtime rate, annual bonus, leave encashment, contribution to provident fund and gratuity.
In enterprises which have field force for supporting the sales and marketing effort, there has been a practice of negotiated tax-free daily allowance for local and out station working of the field force as the job entails travel, boarding and at times lodging expense. Here the tax-free daily allowance is normally paid without any supporting vouchers and at times higher than the normal expense. The eligible tax-free daily allowance is quite often part of a negotiated long-term wage settlement.
CTC
CTC is the nomenclature presently used by Employers while making an offer of employment to show case total remuneration. The final figure shared can be misleading as in some cases it includes items such as performance bonus payable at its maximum (for which amount limited number of persons qualify), monetary value of Subsidised snacks and meals, and gratuity (which again is payable only when an employee completes a minimum of five years of service). Many new employees get at first impressed with the CTC figures shown on the paper, but later feel disappointed when they realise that the monthly take home pay is very much lower, and not one twelfth of the CTC amount, as they had assumed that it would be.
Some companies offer an ? la carte system where employees can opt for allowances of their choice within the negotiated CTC limits. This is done for two purposes: 1) cash now as against deferred payment and 2) reduction of tax liability.
The CTC represents a company?? total annual expenditure on an employee. CTC computation includes all the payments, in cash and in kind, the direct payments and the money value of the welfare benefits and perquisites extended to an employee. Hence, to avoid any misunderstanding or subsequent disappointment, the CTC components should be explained clearly and carefully to a new joinee.
Elements of CTC
The items defined under section 2 (y) of the code fall into three categories of the CTC format in vogue among the companies. They are as follows:
A) Direct benefits to an employee ??(i) basic pay, (ii) dearness allowance, (iii) retaining allowance, (a) bonus, (d) conveyance allowance, (e) special expenses, (f) house rent allowance or reimbursement, (g) amount payable under an award, (h) over time allowance, (i) commission.
Allowances such as shift allowance, education allowance, dress allowance, and any other allowance which form part of the direct benefits but have not been defined anywhere in the Code, will have to be considered as elements of item (e) special expenses and be regarded as part of remuneration.
However, medical allowance or reimbursement, medical insurance premium and leave travel reimbursement, which are shown as part of CTC, may not have to be included in calculating the remuneration under the code.
B) Indirect Benefits to an employee include the item value of house accommodation. Which under Section 2 (y) (b) of the code is defined as: ??he value of any house-accommodation, or of the supply of light, water, medical attendance or other amenity or of any service excluded from the computation of wages by a general or special order of the appropriate Government?? House accommodation to employees plus supply of electricity, water is generally provided in the company?? township. In some cases, accommodation is provided to essential staff or persons in top management cadre. There is a method of computing the value of accommodation, if provided free, as per existing income tax laws.
There are organisations that hich provide also the following benefits: interest free loans for buying assets, food coupons in lieu of subsidised meals, payment of medical insurance premium, free transport to office and free uniform. All these items form part of indirect benefits, but they have not been defined anywhere in the Code. On the other hand, they are being shown as part of CTC by the organisations. These items stay as grey areas and there is a danger that they may become objects of arbitrary interpretation by the Labour & Employment Department.
C) Saving contribution to an employee refers to item 2 (y) (c) of the code contribution paid by the employer to any pension or provident fund, and the interest which may have accrued thereon. Organisations were including the contributions made by the Employer to the employee?? Pension and Provident Fund accounts under the existing law, in the employee?? CTC. However, the interest which may have accrued to the contribution in the year was never considered as part of CTC, as this is not paid by the employer. Be that as it may, for the first time ever, the interest accruing to the contribution has been made a part of remuneration under the new code. This is clearly a new development.
Many companies operate superannuation fund for their executives. The contribution to the superannuation fund, amounting to 15 per cent of an employee?? basic salary (plus dearness allowance, if any), is solely made by the employer. The Government of India has presently set an aggregate limit of Rs 7.5 lakh for employer contributions to the Provident Fund (PF), National Pension System (NPS) and superannuation fund (SF), any contribution beyond which is taxable for the beneficiary, otherwise this amount does not at present attract any liability. In fact, the code seems silent about SF. The SF is, no doubt, a pension fund, and the code does make a mention of pension fund. But the pension fund referred to under item 2 (y) (c) in the Code is about the pension scheme which forms part of the PF. SF does not get discussed at all in the Code.
This is yet another grey area. It would, therefore, be advisable to include the employer?? contribution to the superannuation scheme as part of remuneration. There are companies that have stock options for certain category of employees and this could be a grey area for it to be considered as remuneration based on the Income Tax Act.
Impact on companies
The two items, that pose a problem in computing an employee?? remuneration for a financial year, are overtime and annual bonus. In the case of workers, over time earnings are a part of remuneration. However, the payments are likely to vary from month to month and the exact amount will only be known at the end of the year. Similarly, the annual bonus payable to employees could vary from year to year as the final amount is based on the available allocable surplus. Of course, it is entirely a different matter that in quite a few companies, the quantum of bonus is negotiated and settled with the trade union and is in no way related to the allocable surplus.
All organisations have to calculate the ??ages??as defined under the cde and see whether the existing basic pay, dearness allowance and retaining allowance together amount to more than 50 per cent of the remuneration for every one of their employees, whether they are executives, supervisors, workers or even contract workers. If it does, there would not be any additional financial liability to the company when the code becomes operational.
But in organisations where the ??ages??do not add up to 50 per cent of the remuneration, extra provision will have to be made for leave encashment and gratuity payments. As for the employer?? contribution towards PF, as long as the present limits are in force at ??12 per cent of the wages subject to a present wage ceiling of Rs 15,000 pm ??the additional financial impact is likely to be marginal. If, however, the wage ceiling of Rs 15,000 were to be enhanced or removed, then there is bound to be additional liability, once the code becomes operational.
Conclusion
In cases where the wages paid amount to less than 50 per cent of the total remuneration, organisations need to take corrective measures to remove the anomaly forthwith. The easiest way is to enhance the basic pay gradually while granting annual increments.
Organisations should also institute reasonable limits to leave accumulation and urge their employees to avail of their annual leave regularly. This will reduce a company?? liability considerably when it comes to leave encashment.
There is a provision in the code that the full and final settlement of a departing employee will have to be completed within two working days. This may not pose a problem in the cases of retirement, retrenchment or dismissal of an employee. However, in the cases of resignation
without advance notice, making full and final settlement of the dues within two working days can be a big challenge, as processing of the monthly payroll in most enterprises is outsourced. Hopefully, this issue can be resolved by ensuring that the departing employee has to serve the notice period.
Confusion still persists among the professionals of most companies as to which components of the CTC are to be included in computing the remuneration, to determine the quantum of ??ages?? It would hugely benefit organisations, trade unions and employees, if the Ministry of Labor & Employment, Government of India can release question and answers by sharing real life examples to explain how the ??ages??are to be calculated. This will help the organisations to duly comply with all the provisions of the new code and spare them from being harassed at a later date by government agencies for non-compliance, which, in many cases, could be merely due to ignorance or misunderstandings.
ABOUT THE AUTHOR:
Dr. Rajen Mehrotra is Past President of Industrial Relations Institute of India (IRII, Former Senior Employers??Specialist for South Asian Region with International Labor Organization (ILO) and Former Corporate Head of HR with ACC Ltd. and Former Corporate Head of Manufacturing and HR with Novartis India Ltd. E-Mail: rajenmehrotra@gmail.com
Published in April 2021 issue of Current Labour Reports.
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Concrete
Refractory demands in our kiln have changed
Published
4 days 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
4 days 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
4 days 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.
Refractory demands in our kiln have changed
Digital supply chain visibility is critical
Redefining Efficiency with Digitalisation
Cement Additives for Improved Grinding Efficiency
Digital Pathways for Sustainable Manufacturing
Refractory demands in our kiln have changed
Digital supply chain visibility is critical
Redefining Efficiency with Digitalisation
Cement Additives for Improved Grinding Efficiency
Digital Pathways for Sustainable Manufacturing
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