Concrete
Clean, smart, quick
Published
6 years agoon
By
admin
Touted to be one of the fastest and greenest metro projects in India, Nagpur Metro recently witnessed the completion of the 11 km-long Reach 3 of the East-West corridor of Phase-1.
Nagpur is the 13th largest city by population in India. And according to an Oxford Economics report, it is projected to be the fifth fastest growing city in the world from 2019-2035, with an average growth of 8.41 per cent.
Evidently, the city needed a rapid and green transit network to help transform it into a smart city. This has been answered with Phase 1 of the Nagpur Metro project. Afcons Infrastructure recently completed the construction of Reach 3 of the East-West corridor of Phase 1 of the project in a record 28 months; the project will soon be inaugurated. The 11-km viaduct will soon provide better and safe transportation for the people of Nagpur.
Benefits to the city
A clean, smart and quick mode of transport is the need of the hour for the smart city of Nagpur. The metro-rail project aims at reducing traffic congestion; improving air quality and reducing pollution; significantly reducing travel time; and lowering the carbon footprint by shifting private vehicle users to energy-saving and efficient public transport. The metro-rail service between Sitabuldi and Lokmanaya Nagar stations provides connectivity to the educational hub in the city and MIDC Hingna, the industrial area.
Key highlights
Civil structure specifications in the construction of Reach 3 included: Foundation ? pile, pile cap, open foundation and pedestal; substructure – pier, cantilever pier cap, standard pier cap, portal; and superstructure – segment casting, segment launching, I-girder casting, I-girder erection deck slab casting.
Other highlights:
Nagpur Metro Phase 1 is a 41.7-km project, and Afcons’s scope includes 17.087 km in two stretches: Reach 2 (North-South corridor) and Reach 3 (East-West corridor), and, Sitabuldi Metro station (50 per cent of the entire phase)
370 spans launched in just 20 months with a record peak progress of 30 spans in one month.
3,456 segments cast in 20 months, a rare feat in the Indian metro-rail segment.
Sitabuldi Interchange Station made operational for the North-South and East-West corridors in just 20 months.
Execution records
Meticulous planning and efficient execution were the key factors that ensured that Nagpur Metro Reach 3 was executed in a record 28 months. As Vaikunth J Pai, Project Manager, Nagpur Metro Reach-3, Afcons Infrastructure, shares, "The team submitted the design and received the requisite approvals from the client on time. Afcons deployed three launching girders and six sets of ground support staging for segment launching. A considerable amount of time was saved when the number of portals in the project was reduced to 20 from 57." Further, another methodology used was segment casting-using the long-line method with 10 beds of segment casting.
Design and construction techniques
The Reach 3 corridor was planned in an efficient and sustainable manner. As Pai elaborates:
Segment launching over Govari Flyover using GSS and launching girders: At Nagpur Metro Reach 3 project, the Afcons team had to launch a segment on span over the busy Govari flyover at Jhansi Rani Square. However, the segment could not be hoisted in the conventional method as the existing structure was causing an obstruction. Therefore, a tower with single-piece sliders was erected near P293 at the end of the flyover. The segment was then placed on the tower using cranes and was lifted from there using an indigenously designed and fabricated launching girder.
– Maximum height of pier: 25 m
– Maximum curve radius: 125 m
– Maximum gradient: 2.461
– Maximum span length of viaduct: 36 m.
Afcons installed GSS sliders over cribs and launched the segment using the launching girder at the crossing of the nallah between the span in the Crazy Castle area.
A cantilever staging arrangement was used for the construction of pier arms at Ambazari Station. The station was constructed over the slope of a dam, where support was taken from the pedestal itself.
A GSS staging system was used for the construction of the pier arm to save time, as crib staging involves welding and cutting.
A combination of GSS and launching girder was used for launching at P169-170, which was obstructed by overhead and underground water tanks.
Construction of portal for future expansion: The Nagpur Metro project has been planned keeping in mind the possibility of expansion in future. The construction of a portal was proposed for this purpose. However, a challenge was that land was not available for the construction of one leg of the portal. Hence, Afcons designed the portal in such a way that it can be accommodated in available land, and expanded for future construction.
Construction of pier cap without pier arm at LAD station: The normal sequence of construction of the pier cap at the station location is to build the pier arm first and then the pier cap. As land was not available at the LAD station and waiting would have resulted in loss of time, pier caps were cast without casting the pier arm.
Fly ash was used as a replacement for cement in concrete.
At Ambazari, the team had to undertake activities around a dam. To maintain the stability of slope of the dam and avoid excavation in the area, the pile cap was constructed above the ground level. It made use of liner while piling to avoid the vibrations of winches at the dam location.
While making the segments, the team had to change the spacing of bars and increasing the diameter of steel while keeping the quantity of reinforcement same. Also, UPV test was done on each segment.
Quality materials
The project made use of high-quality materials in the construction of this stretch. As Pai shares:
Cement was blended with fly ash and GGBS for the mix design of concrete; this was not only cost-effective but improved the durability of structures.
Micro-silica as mineral admixture was used in concrete, which helped achieve high-grade concrete strength.
VMA (viscosity-modified admixture) was used in self-compacting concrete for controlled cohesiveness and homogeneity of the concrete mix.
A curing compound was used that benefitted the time cycle, resulting in acceptable compressive strength.
Highly fluid epoxy grout (EP-10, Make-Fosroc) and non-shrink grout GP-2 were used for repairing.
Polypropylene fibre was used in concrete for precast structures (segments), which prevented shrinkage of cracks and increased bonding strength.
Inhibitor solution was used to prevent TMT bars from corrosion.
Bipolar admixture was used in concrete for corrosion prevention of TMT bars and had a positive impact on time, cost and manpower.
Solvent-free epoxy resin grout was used for anchor plate grouting.
PCE (polycarboxylate)-based admixture was used in concrete for designing workable parameters.
Omega seal expansion joint was used with high-quality neoprene, which benefitted in terms of the time factor and manpower for easy installation.
Equipment required
The project made use of unique equipment, including:
- Three piling rigs – for pile foundation
- Six 40-tonne cranes -for pier/pier cap/portal shuttering and de-shuttering
- Boom placer – for concreting of pier/pier cap/portal
- Five 20-tonne excavators with rock breaker – for open foundation
- Five 60-tonne gantries – for loading of segments and I-girder
- Nine 60-tonne trailers – for transportation of segments from casting yard to site
- Two 100-tonne modular trailers – for transportation of I-girder
- Three launching girders and six GSS – for span erection
- Three 200-tonne cranes – for I-girder erection and segment erection in GSS.
Safe and green
Safety and environment-friendly construction measures were taken to protect the safety and health of every person at site; comply with the relevant statutory and contractual safety, health and environment requirements; have trained, experienced and competent personnel and supervision; maintain plant, places and systems of work that are safe and without risk to health and the environment; provide all personnel with adequate information, instruction, training and supervision; effectively control, coordinate and monitor the activities of all personnel, including contractors, in terms of safety, health and environment and security; and establish effective communication on safety, health and environment matters with all relevant parties.
"Afcons establishes and maintains strong health, safety and environment protocols for any project," says Pai. "We have mandatory, daily briefings by safety officers and the shift in-charge before the shifts every day. For every phase of the project, we planned safety inductions for all workers and employees. All PPE is checked and maintained periodically to ensure the highest safety of people. We have always followed a safety culture and constantly promote it through various awareness sessions, camps, check-ups, etc." Afcons has clocked 12 million safe manhours in the project till date.
What’s more, as this work was undertaken in the city area, all excavated earthwork was properly disposed of at designated locations to ensure it did not affect the environment. Further, standard procedures and protocol were followed at site to reduce energy consumption.
Evidently, the Nagpur Metro is living up to its fast, clean, green promise!
-SERAPHINA D’SOUZA
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Cement Demand Revives As Prices Decline In Q3 FY26
Nuvama reports improved volume growth after price correction
Published
5 hours agoon
February 24, 2026By
admin
A report by Nuvama Financial Services (Nuvama) said cement sector demand revived in the third quarter of fiscal year twenty twenty six as prices declined, supporting volume growth across regions. The note indicated that sequential price correction helped replenish demand that had been subdued by elevated pricing earlier in the year. Nuvama quantified the price decline as a sequential correction that varied across states and segments, facilitating restocking by merchants and traders.
The report suggested that improved affordability after the price correction encouraged housing and infrastructure activity, with developers and contractors adjusting procurement plans. It added that regional dynamics varied, with some markets showing faster recovery while others remained reliant on seasonal construction cycles. Housing demand was driven by both affordable and mid segment projects, while infrastructure segment recovery was contingent on timely execution of public works.
Analysts at Nuvama assessed that the price moderation eased inventory pressures for manufacturers and distributors and supported margin stabilisation at several producers. Demand improvement was visible in both urban and rural segments, although the pace of recovery differed by state and trade channel. Producers were seen balancing price realisations with volume targets and managing input cost volatility through operational efficiencies.
The report recommended that investors monitor volumes and realisations closely as market equilibrium emerges in the coming quarters, noting that sustainability of recovery would depend on monsoon patterns and government infrastructure outlays. Overall, the assessment pointed to a cautiously optimistic outlook for the cement industry as price correction translated into tangible volume gains. Market participants were advised to track early signs of demand broadening beyond core construction hubs to assess the depth of the rebound.
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.
Cement Demand Revives As Prices Decline In Q3 FY26
Refractory demands in our kiln have changed
Digital supply chain visibility is critical
Redefining Efficiency with Digitalisation
Cement Additives for Improved Grinding Efficiency
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Digital supply chain visibility is critical
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