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Philosophy of High Strength Cement/Concrete

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Dr SB Hegde, Professor, Pennsylvania State University, USA, delves into the aspects of durability and sustainability of high strength concrete.

The world is passing through difficult and troubled times, and we live in a rapidly changing world. The construction industry is facing many challenges – global warming, climate change forces and the capability to achieve sustainable development and economic progress without damaging our environment. The concrete industry in particular faces further challenges. There is extensive evidence to show that concrete materials and concrete structures all over the world are deteriorating at a rapid rate, and that we are unable to ensure their long-term durable service life performance.
To confound this situation, we are also faced with an urgent need to regenerate our infrastructure systems if we are to eradicate poverty and provide a decent ‘quality of life’ for all the peoples of the world.

Durability vs strength
This paper shows that the current emphasis on high strength and very high strength, and the design philosophy of durability through strength for concrete materials and concrete structures is fundamentally flawed. It is this misleading concept and vision that is primarily responsible for the lack of durable performance of concrete in real life environments.
To change this scenario, this paper advocates that concrete materials must be manufactured for durability and not for strength. It is shown that this concept of strength through durability can be achieved through careful design of the cement matrix and its microstructure. If concrete is to be an eco-friendly, and sustainable driving force and construction material for social change, the need is to produce durable concrete with strengths of 30 to 60 to 80 MPa rather than very high strength concrete without an assured durable performance.
Engineers are, by nature, fascinated and indeed obsessed, by high strength and very high strength concrete. Part of this fascination arises from the widely-held misconception that high strength concrete is, per se, highly durable.

Making it last longer
This intuitive association of strength with durability is again partly due to the current Ultimate Strength Design approach which creates an implicit belief and illusion that if concrete is proportioned to give high compressive strength, and then, if prescriptive code specifications in terms of cement content, water/cementitious materials (w/cm) ratios, types of cement, steel cover thickness and types and amounts of mineral and chemical admixtures are adhered to, then somehow the durable service life of the concrete structure will be automatically and adequately assured.
The impetus for higher and higher concrete strengths also came from demands for exceptional increases in the height of high-rise buildings and for long span bridges. Indeed, the higher concrete strengths also brought in visible economics in terms of use of materials, increased usable space and shorter times of construction. As a result the latter part of the last century saw the development and use of concrete with compressive strengths from about 40 to 100/120 MPa and beyond.
Holistic Durability Design Philosophy – an integrated material and structural design strategy – of strength through durability rather than of durability through strength where materials are manufactured for durability rather than for strength, and structures are designed for ductility and structural integrity. Holistic design envisages a global approach to all aspects of concrete and construction technology from material selection, design, construction, and maintenance to service life, integrating material characteristics with in situ performance. Use of cement replacement materials, design for material stability, design for structural integrity and
design for sustainability are the key elements of this holistic durability design to achieve durable service life performance.

About the author:
Awarded with the ‘Global Visionary Award’ for his contribution to the cement industry in November 2022, Dr SB Hegde has been an integral part of the industry and has worked as an expert consultant for various international bodies in the cement domain. He currently holds the role of visiting faculty at the Pennsylvania State University, USA.

Concrete

Nuvoco commissions Surat grinding unit

Nuvoco posts 20 per cent rise in Q1 PAT

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Nuvoco Vistas Corp. has announced its financial results for the quarter ended June 30, 2026, reporting growth in volumes, earnings and profitability while advancing its expansion plans in western India.
The company inaugurated a 2-million-tonnes-per-annum (MTPA) grinding unit at its Limla Cement Plant in Surat on July 11, 2026, ahead of schedule. The facility, part of the Vadraj Cement assets, is expected to strengthen Nuvoco’s presence in western India while freeing up capacity at its Rajasthan plants to cater to demand in northern markets.
Progress at the Kutch project remains on track, with phased commissioning scheduled to begin in the third quarter of FY27. The company has also commenced work on a bulk cement terminal at Viramgam, Sachana, Gujarat, featuring a dedicated railway siding. The terminal is expected to become operational by the second quarter of FY28 and will support distribution across Gujarat. These projects form part of Nuvoco’s capacity expansion programme, which is expected to increase its total cement capacity to 35 MTPA by FY28.
During Q1 FY27, the company recorded cement sales volumes of 5.3 million tonnes, up 5 per cent year-on-year. Consolidated total income rose 9 per cent to Rs 31.29 billion, while EBITDA increased 7 per cent to Rs 5.72 billion, marking the company’s highest-ever first-quarter EBITDA. Profit after tax grew 20 per cent year-on-year to Rs 1.60 billion.
Commenting on the results, Jayakumar Krishnaswamy, Managing Director, Nuvoco Vistas Corp., said the company delivered improved business performance despite macroeconomic and geopolitical challenges. He attributed the results to disciplined execution, cost optimisation and operational efficiencies, while highlighting the early commissioning of the Surat grinding unit as a key milestone in the company’s expansion strategy.
He added that the company remains focused on prudent procurement, supply chain efficiency and cost discipline while monitoring geopolitical developments that could affect industry supply chains and input costs.

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Concrete

Cement Sector Faces Sluggish Growth in First Half of FY27

April Price Hikes Unlikely To Offset Margin Decline

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Nuvama Institutional Equities has warned that India’s cement industry is expected to record subdued volume growth in the first half of fiscal year 2026-27 before a recovery in the second half. The brokerage assessed that price increases implemented in April 2026 will be insufficient to offset an overall decline in sector profitability. It attributed the outlook to weak demand and fresh capacity additions scheduled during fiscal years 2026-27 and 2027-28 that are likely to keep prices under pressure.

The report noted that demand was sluggish in April and May 2026 owing to global uncertainty, labour shortages, heatwaves, constraints in raw materials and unseasonal rainfall. Producers raised prices across regions in April to mitigate rising petcoke costs and higher packaging expenses, but the increases proved short lived. Nuvama reported that standard petcoke prices rose to USD153/t, around USD41/t higher than in the third quarter of fiscal year 2025-26.

Price correction followed weaker demand, limiting the net increase to about Rs 10-12 per bag by the end of the quarter. Imported petcoke prices have since fallen to USD132/t from a recent peak of USD168/t, although they remained roughly USD20/t higher quarter on quarter. The brokerage expected the higher input cost impact to begin reflecting from late quarter one of FY27 and to continue into early quarter two.

Nuvama also estimated that crude linked increases were likely to raise packaging costs by about Rs 120-150/t and to exert upward pressure on freight. It warned that soft demand combined with significant new supply coming on stream in FY27-28 would keep pricing under strain and constrain near term margin recovery. The report concluded that volume growth was likely to be sluggish in the first half of FY27 before recovering in the second half.

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Nuvoco Vistas launches Limla cement plant, expands Gujarat footprint

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Nuvoco Vistas opens a 2 MMTPA grinding unit at Limla, entering Gujarat and advancing its target of 35 MMTPA capacity by FY 2028.

Surat (Gujarat)

Nuvoco Vistas Corporation Ltd, a part of Nirma Group and one of India’s leading building materials company, has inaugurated the Limla Cement Plant in Surat (Gujarat), one of Vadraj Cement Limited’s (VCL) principal manufacturing facilities. The commissioning represents a key milestone in Nuvoco’s acquisition and restoration of VCL, while supporting the company’s expansion across the Western Indian cement market.

Vadraj Cement Limited is a subsidiary of Nuvoco Vistas Corporation Limited and has installed cement capacity of 6 MMTPA across its assets. The Limla inauguration therefore represents the first operational step in the acquired platform’s wider revival, while the Kutch facilities provide clinker supply, mineral security and coastal logistics support for the western business.

Nuvoco completed its acquisition of Vadraj Cement Limited, then under the Corporate Insolvency Resolution Process, after paying a consideration of Rs 1,800 crore in June 2025. VCL’s asset portfolio comprises a clinker unit at Kutch and a grinding unit at Limla in Surat. It also includes high-quality captive limestone reserves and a captive jetty at Kutch, supporting more efficient logistics. Following the takeover, Nuvoco began an extensive programme of restoration, refurbishment and expansion at both locations, leading to the commissioning of the Limla plant.

The Limla Cement Plant is expected to support a phased increase in sales volumes across Gujarat. It will also help Nuvoco supply neighbouring markets in Western Maharashtra and release cement capacity from its northern plants, which can consequently be redirected towards markets in North India. The plant will manufacture a full portfolio comprising Ordinary Portland Cement, Portland Slag Cement, Portland Pozzolana Cement and Portland Composite Cement. It will additionally produce the complete Nuvoco Duraguard range, including the premium Nuvoco Duraguard Microfibre product. The acquisition is also expected to generate operational synergies with Nuvoco’s existing plants at Nimbol and Chittorgarh in Rajasthan, improving logistics optimisation and market reach across important regional markets.

The grinding unit at the Limla Cement Plant was completed ahead of schedule, with 2 MMTPA of capacity now inaugurated to expand Nuvoco’s operating scale and customer reach. After Vadraj Cement’s assets become fully operational, plants in North and West India are expected to account for nearly 40 per cent of Nuvoco’s total cement capacity. This will broaden the company’s manufacturing network, strengthen access to high-growth markets and support its plan to increase consolidated cement capacity to 35 MMTPA by FY 2028, reinforcing its longer-term growth strategy.

Commenting on the development, Jayakumar Krishnaswamy, Managing Director, Nuvoco Vistas Corp Ltd, said: “The inauguration of the Limla Grinding Unit in Surat is an important milestone in Nuvoco’s growth journey and demonstrates our commitment to disciplined, value-accretive expansion. Gujarat is strategically significant for Nuvoco, with substantial opportunities arising from infrastructure investment, industrial growth, rapid urbanisation and continuing demand from the housing and construction sectors. The facility strengthens our regional footprint, improves operational flexibility and increases our ability to serve customers across northern and western markets with greater reliability and efficiency.”

He added: “Through the Vadraj acquisition, we have refurbished and restarted a strategically important asset, returning it to operations in record time through strong execution and collaboration between teams. The achievement demonstrates our ability to create value from acquired assets, fulfil our commitments and retain the confidence of stakeholders. It also highlights the strength of our project delivery capabilities and our continued focus on building sustainable, profitable growth over the long term.”

Nuvoco Vistas Corporation Limited is a building materials company whose vision is to build a safer, smarter and more sustainable world. It is among the leading players in East India and has a significant presence across North and West India. Nuvoco began operations in 2014 with a greenfield cement plant at Nimbol, Rajasthan. It later acquired Lafarge India Limited, which had entered India in 1999, followed by Emami Cement Limited in 2020 and Vadraj Cement Limited in April 2025. The company has also announced an expansion in eastern India through a new grinding mill at the Arasmeta Cement Plant, supported by several debottlenecking programmes involving equipment upgrades, process improvements and internal capacity initiatives. These developments place Nuvoco on track to achieve total cement capacity of approximately 35 MMTPA. The company reported total income of Rs 11,362 crore in FY 2025-26, reflecting its continuing growth trajectory.

Nuvoco operates a diversified portfolio across three segments: Cement, Ready-Mix Concrete and Modern Building Materials. Its cement portfolio includes Concreto, Duraguard, Double Bull, PSC, Nirmax and Infracem, covering Ordinary Portland Cement, Portland Slag Cement, Portland Pozzolana Cement and Portland Composite Cement. Its pan-India RMX business provides value-added products under Concreto for performance concrete, Artiste for decorative concrete, InstaMix for ready-to-use bagged concrete, X-Con covering M20 to M60 grades, and Ecodure for specialised green concrete. Nuvoco has supplied materials to projects including the Mumbai-Ahmedabad Bullet Train, Birsa Munda Hockey Stadium in Rourkela, Aquatic Gallery at Science City in Ahmedabad, and metro railway projects in Delhi, Jaipur, Noida and Mumbai.

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