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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

Star Cement Named Preferred Bidder For Boro Lakhindong Block

Preferred bidder for limestone mining lease in Assam

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Star Cement has been declared the preferred bidder for the mining lease for Boro Lakhindong West Block following e-auctions conducted by the Government of Assam. The block is located in Boro Lakhindong Village, Umrangso Tehsil, Dima Hasao District, Assam, and extends over an area of 123 hectares. The estimated limestone resource is 207.822 million (mn) tonnes (t), a quantity that will supply raw material for cement production and support the company’s manufacturing operations in the region.

The company is engaged in the manufacturing and selling of cement clinker and cement and distributes products across the north-eastern and eastern states of India. Star Cement operates plants and logistics networks that procure and process limestone to produce clinker for cement, and the addition of Boro Lakhindong is presented as a strategic enhancement of feedstock availability. The preferred bidder status secures rights to the specified lease area under the terms of the auction process.

Financial results for the company in the fourth quarter of fiscal year 2026 showed a consolidated net profit rise of 20.24 per cent to Rs 1,481.0 mn on an 11.54 per cent increase in revenue to Rs 11,735.5 mn compared with the corresponding quarter of the previous year. Those results reflected higher sales volumes and revenue growth in the company’s primary markets and are cited in company disclosures accompanying the lease announcement. The reported performance provides context to the company’s ability to pursue and finance new mining lease opportunities.

Market reaction to the declaration was modest, with the scrip rising zero point thirty six per cent to trade at Rs 212 on the BSE. The award of the Boro Lakhindong lease concludes the e-auction process for the west block and assigns operational rights to Star Cement as the preferred bidder, subject to completion of statutory and contractual formalities.

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KERC Proposal To Cut Rooftop Solar Export Tariff Raises Concern

Consumers and advocates urge regulator to reconsider change

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The Karnataka Electricity Regulatory Commission (KERC) has proposed a reduction in the tariff paid for surplus electricity that rooftop solar installations export to the grid, prompting concern among consumers, renewable energy advocates and industry specialists. The proposal arrives while the Central government and state governments are promoting clean energy adoption and offering subsidy schemes to encourage rooftop solar deployment. Thousands of households in Karnataka, particularly in Bengaluru, have invested substantial sums in rooftop systems to reduce reliance on conventional power and support state renewable targets.

Stakeholders have raised questions about the implications of a lower export tariff for the financial attractiveness of rooftop solar investments and the pace of the state transition to renewables. Industry analysts warned that a reduction in compensation for excess generation could discourage new installations and extend payback periods for existing systems. Current messaging from authorities, which simultaneously promotes adoption while proposing lower export rates, has been described by user groups as creating contradictory signals for consumers.

Experts argued that policy measures should focus on grid modernisation rather than reducing consumer benefits, with investments in transmission and distribution networks needed to manage higher volumes of distributed solar generation. Consumer groups and renewable advocates are preparing written submissions to the regulator and are urging retention of incentives that support household adoption of rooftop systems. KERC has invited public objections and suggestions as part of a consultation process that will determine the final tariff framework.

The outcome of the consultation is expected to influence the future growth of rooftop solar across the state and shape investor confidence in small-scale renewable projects. Residents who have already installed rooftop panels are monitoring developments closely because changes to compensation mechanisms may affect household finances and the speed of return on investment. Observers noted that coherent policy, aligned incentives and grid upgrades would be essential to sustain momentum in the rooftop solar sector.

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Indian Railways Plans Green Fly Ash Transport Network

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Specialised rail logistics will move fly ash from power plants to infrastructure industries.

New Delhi

Indian Railways is planning a large-scale green logistics initiative to transport fly ash from thermal power plants to industries where it can be reused in infrastructure and construction activities.

The initiative was discussed during a review meeting chaired by Union Minister for Railways Ashwini Vaishnaw. Union Ministers of State for Railways V Somanna and Ravneet Singh Bittu were also present.

India generates nearly 340 million tonnes of fly ash every year from thermal power plants. The proposed initiative aims to create an efficient rail-based transport system using specialised containers and dedicated logistics arrangements to move fly ash safely from power plants to end-use industries.

Fly ash is widely used in road construction, cement manufacturing, brick production, concrete, blocks and boards. By improving its movement through the railway network, the initiative is expected to support better utilisation of this industrial by-product while reducing environmental concerns linked to storage and disposal.

The move also aligns with India’s circular economy goals by converting waste from thermal power generation into a useful raw material for the construction and infrastructure sectors. Wider availability of fly ash can help reduce material costs in areas such as bricks and cement, supporting more affordable infrastructure and housing development.

Through this initiative, Indian Railways aims to provide a cleaner, safer and more organised transport solution for fly ash, turning an environmental challenge into an infrastructure resource.

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