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Use of SCMs can be optimised with technology

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RS Kabra, Executive Vice President – Commercial, Wonder Cement, talks about the impact on profitability of the cement business and quality of the end product.

Tell us about the supplementary cementitious materials used by your organisation in manufacturing of cement.
The major cementitious materials used in India are fly ash and blast furnace slag. Fly ash is generated in huge volumes mainly in coal based thermal power plants and is a major hazard to the environment across the country. Slag is generated in the blast furnace of steel manufacturing plants.
We utilise fly ash as supplementary cementitious material in the manufacturing of Portland Pozzolana Cement (PPC) at all of our cement plants, as the plants are situated nearby thermal plants. With the use of fly ash as a SCM, besides contributing to environmentally friendly disposal of fly ash, we are also contributing in reduction of CO2 emission by reducing the use of thermal heat and electricity. This also leads to conserving natural mineral resources of limestone.
Blast furnace slag, another important supplementary cementitious material, is a by-product of the steel making process. The use of slag as a supplementary cementitious material is also well established in manufacturing of cement, specially in cement
plants which are located near steel plants. Our cement plants are not located near any steel plant; thus, at present we do not use slag as a supplementary cementitious material.

What are the key benefits of using supplementary cementitious materials?
The most important benefits of using SCMs in manufacturing of cement is environmentally
friendly disposal of these hazardous materials and a significant reduction in CO2 emission by savings in thermal heat, electricity, and conserving natural resources (limestone).
Substituting a cementitious material in the raw mix for cement manufacturing helps us in conserving natural minerals (limestone), thermal heat (coal), and electricity.

How does the use of supplementary materials increase the profitability of the cement manufacturing for your organisation?
Use of supplementary cementitious materials has a direct impact on the profitability of cement manufacturing companies as replacing natural limestone by SCMs results in reduced requirement of thermal heat, electricity etc.

What is the proportion of supplementary cementitious materials in the production of cement by your organisation?
The Bureau of Indian Standards guidelines permits the use of supplementary cementitious materials up to 35 per cent in PPC cement, accordingly at Wonder Cement we use up to 35 per cent fly ash in the manufacturing of Portland Pozzolana Cement.

Tell us about the quality standards and checks implemented for the final product made using supplementary materials.
In terms of quality, the end product, PPC manufactured by Wonder Cement is always substantially higher than the quality standard prescribed by the Bureau of Indian Standards (BIS) and also higher than most of the other brands of cement available in the market.
This high standard of quality of PPC manufactured by us is possible because of the adoption of the best available technology in the world, including automatic sampling, automatic testing and based on test results, automatic corrective actions, etc. There is absolutely no scope for manual errors or manual dependency in the process of cement manufacturing at WCL.
Tell us about the role of technology in deciding the proportions of SCMs.
Technology plays a very important role in producing quality cement as well as optimum use of SCMs. The processes of automatic sampling, automatic testing and automatic corrective actions play a major role in maintaining the quality of cement as well as optimum use of SCMs.

What are the major challenges you face while using supplementary materials for cement manufacturing?
There is availability of the latest technology, advanced equipment, and continuous use of technology rather than human dependency. Therefore, we do not see any challenge in using supplementary cementitious materials.

How does the use of cement made of supplementary materials impact its carbon footprint?
Fly ash is a supplementary cementitious material and is being used as part replacement of clinker in the raw mix for the production of PPC. Reduction in the use of clinker directly results in the reduction of the use of thermal heat and electricity, required in the manufacturing of clinker. The reduced use of clinker also results in conserving the natural mineral limestone as well as the energy consumed in mining the limestone.

  • Kanika Mathur

Concrete

Cement Makers Reaffirm Commitment to Sustainable Growth

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World Environment Day spotlight on innovation and circularity

On World Environment Day, the Indian cement industry reiterated its commitment to supporting India’s climate ambitions through sustainable manufacturing, resource efficiency and the adoption of cleaner technologies.

The Cement Manufacturers’ Association (CMA) said the sector remains aligned with the Government of India’s Net Zero commitments and is accelerating efforts to reduce its environmental footprint while supporting the country’s infrastructure and development agenda.

Parth Jindal, President, CMA and Managing Director, JSW Cement, said the industry is increasingly adopting cleaner technologies, improving energy efficiency and expanding the use of alternative fuels and raw materials. He also highlighted the growing importance of circular economy practices, where industrial by-products and waste streams from one sector are utilised as resources in another.

“The Indian Cement Industry is aligned to the Government’s commitments on carbon mitigation and is accelerating the adoption of cleaner technologies, resource efficiency and circular economy practices while actively exploring the potential of Carbon Capture, Utilisation and Storage (CCUS) as a critical pathway for deep decarbonisation,” said Jindal.

He added that coprocessing industrial waste and by-products helps conserve natural resources, reduce disposal requirements and lower the environmental footprint across multiple sectors.

According to Jindal, sustainability is no longer limited to manufacturing processes but is increasingly influencing investment decisions, innovation strategies and long-term growth plans within the industry.

Echoing similar views, Dr Raghavpat Singhania, Vice President, CMA and Managing Director, JK Cement, said sustainable development extends beyond emissions reduction and must also focus on responsible resource utilisation and waste minimisation.

“Sustainability in the built environment cannot be measured by emissions alone. It is equally about how efficiently we use resources, how effectively we minimise waste and how responsibly we create the infrastructure that will serve future generations,” said Singhania.

He noted that the cement industry is advancing its sustainability agenda through greater resource efficiency, increased circularity, technological innovation and continuous improvements in manufacturing practices. As a key contributor to India’s infrastructure development, the sector has a critical role to play in balancing economic growth with environmental responsibility.

On the occasion of World Environment Day, industry leaders reaffirmed their commitment to supporting India’s climate goals while delivering the materials required for resilient, durable and sustainable infrastructure.

 

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Building a Greener Future Together

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Environmental sustainability requires immediate action, not just long-term commitments and discussions. Recycling, circular economy practices, and technology-driven waste management can help industries reduce environmental impact while supporting sustainable growth.

Author: Jignesh Kundaria, Director and CEO, Fornnax Technology

World Environment Day serves as an important reminder that environmental sustainability can no longer remain confined to discussions, reports, or long-term commitments. The environmental challenges facing the world today demand immediate, measurable, and collective action. Across industries and communities, waste generation continues to outpace our ability to process it responsibly, placing increasing pressure on ecosystems, natural resources, public health, and the well-being of future generations.

One of the most significant shifts required today is a change in how society perceives waste. Rather than being viewed as a material to be discarded, waste must be recognised as a valuable resource that can contribute to both economic growth and environmental protection when managed through the right technologies and systems. This mindset forms the foundation of the circular economy model that countries across the world are increasingly adopting to reduce landfill dependence, recover valuable materials, and create more sustainable industrial ecosystems.

India has made meaningful progress in strengthening awareness around sustainability, recycling, and environmental responsibility over the past decade. Significant efforts are being made to formalise the recycling sector through improved infrastructure, technology adoption, policy implementation, and broader stakeholder participation. These developments are creating a stronger foundation for responsible waste management and resource recovery across the country.

However, achieving long-term environmental impact requires collaboration from all stakeholders. Industries, policymakers, technology providers, and communities must work together with greater accountability to strengthen recycling ecosystems, encourage responsible waste management practices, and create sustainable outcomes through consistent execution rather than temporary interventions.

As someone closely associated with the recycling industry, I firmly believe that technology will play a decisive role in addressing future environmental challenges. Advanced recycling systems have the potential to recover valuable resources, reduce pollution, minimise landfill burdens, and conserve energy, creating a more sustainable future for generations to come. This belief is deeply reflected in Fornnax’s motto, “Committed to Create a Green Future,” which embodies our commitment to building long-term environmental value through innovation and responsible action.

At the same time, technology alone cannot deliver meaningful change. Real progress requires intent, awareness, participation, and a shared sense of responsibility. Sustainable development can only be achieved when innovation is supported by collective action and a genuine commitment to environmental stewardship.

On this World Environment Day, let us move beyond conversations and take meaningful steps towards creating a cleaner, greener, and more sustainable planet. By embracing innovation, strengthening recycling ecosystems, and acting responsibly today, we can create lasting environmental impact and secure a better future for generations to come.

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Concrete

JK Lakshmi Advances LC3 Cement Expansion

Company highlights commercial production and research partnerships

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The meeting reviewed progress in limestone calcined clay cement (LC3) technology and its commercial adoption in India’s cement sector, focusing on low-carbon alternatives to conventional binders. JK Lakshmi Cement noted that limestone calcined clay cement can reduce carbon dioxide emissions by up to 40 per cent compared with conventional cement and said this reduction supports industry decarbonisation. The company highlighted that it was among the first two cement manufacturers in India to move LC3 into commercial production after the Bureau of Indian Standards approved the technology as a cement standard.

Vinita Singhania said the transition of LC3 from research to commercial production reflected collaboration between industry, academia and international institutions. Maya Tissafi acknowledged JK Lakshmi Cement’s role in advancing LC3 adoption in India and its contribution in taking the technology from laboratory trials to commercial implementation. Both representatives underlined the growing relevance of sustainable construction materials as India expands infrastructure and urban development.

The meeting explored continued collaboration with Swiss research institutions such as EPFL, EMPA and ETH Zurich alongside Indian academic partners and development organisations. JK Lakshmi Cement has been associated with the LC3 initiative since 2014 and worked with EPFL, IIT Delhi, IIT Madras, Development Alternatives and Technology and Action for Rural Advancement. The company conducted one of the earliest industrial trials of LC3 and recently announced commercial production of Green Pro LC3 cement from its Jaykaypuram plant in Rajasthan.

India remains the world’s second-largest cement producer and expansion of infrastructure, urbanisation and housing demand continue to support long-term sector growth, increasing interest in low-carbon technologies. The company reported an annual turnover of more than Rupees (Rs) 60 bn and current cement capacity of about 18 million (mn) tonnes (t) per annum, with a target of reaching 30 million (mn) tonnes (t) by 2030. Apart from grey cement, the company also makes ready-mix concrete, gypsum plaster, wall putty, primers, adhesives and fly ash blocks, and both sides concluded on the need for continued collaboration to develop sustainable construction solutions.

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