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We use computerised batching plants to ensure proper blending of fly ash with concrete

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Mayur Shah, Managing Director, Marathon Group

Availability of good quality fly ash is not an issue. And the methods for testing it are well established as well. Construction leaders have now realised the merits of blending fly ash, and some, like the Marathon Group, are using fly ash in all their projects. The challenge however, is to blend it perfectly, says Mayur Shah, in an interaction with ICR. Excerpts from the interview.

How often, and how much of fly ash do you blend in cement?
We have used fly ash blended concrete in all our projects. We have been replacing cement with 28 per cent of fly ash in our blends. We produce high performance concrete using fly ash, GGBS, etc. Apart from blended concrete, we are using fly ash bricks too for construction. These bricks have better density and strength as compared to the conventional ones.

What encourages you to use fly ash in such significant quantities?
We at Marathon believe that our buildings should last for 75 years without any deterioration despite adverse weathering conditions. We also aim to reduce the cost of building repairs. In order to gain maximum benefits, we use high quality materials for in the construction process. Fly ash is one such material used by us.

How does fly ash contribute to concrete strength?
Fly ash is rich in silica. After primary cement hydration reaction, free lime available in concrete reacts with silica of fly ash and forms calcium silicate hydrate gel, which further adds to the strength of concrete as well as reduces porosity. This is called secondary reaction and it continues for at least a year. It increases durability of the structure over time. As (part of) cement content in the mix is substituted by fly ash, the heat of hydration gets reduced, which in turn eliminates the cracks in concrete.

Can you name some of your noteworthy projects where fly ash was used in significant quantity?
We have successfully completed many projects in which fly ash has been used:

  • Residential tower Marathon Era – 36 storeys in South Mumbai
  • Commercial Tower Marathon Futurex – 25 storeys in South Mumbai
  • Residential Tower Monte Vista – 33 storeys in Mulund, Mumbai
  • Residential Complex Marathon Nagari at Badlapur – winner of Best Low Cost Housing Apartments, at the CREDAI Real Estate Awards in 2012.

How do you ensure quality of your fly ash-cement blend?
Manual blending of fly ash is prone to errors. It is not possible to get desired quality of concrete consistently unless there is strict supervision on the site. So we use computerised batching plants at our sites to ensure proper blending of fly ash with concrete. There is no need for human intervention in the production of concrete. This eliminates any possible blending errors and helps us make good quality concrete consistently.

How do you assess the quality of fly ash?
Fly ash is broadly classified as Grade I or Grade II. As per IS 3812-2003, when silicon dioxide (SiO2), aluminium oxide (Al2O3) and Iron (Fe2O3) quantiles are more than 70 per cent it is classified as Grade I. We have been using the Grade I fly ash, which has at the most 5 per cent loss on ignition. Also, retention on 45 micron must be less than 34 per cent (by wet sieving method) as per IS: 3812 (Pt-I)-2013. We have also been using fly ash having 20 per cent retention on 45 micron sieve. We conduct sieve analysis test on site to ensure that the material retention on 45 micron sieve is in desired range.

What about the availability of good quality fly ash in the country?
Fly ash is generated as a by-product while burning coal at power plants. We are sourcing it from Dahanu and Nashik power plants. This raw fly ash is graded on the basis of its silica, alumina and iron content. We are not facing any issues in sourcing good quality fly ash.

Concrete

PROMECON introduces infrared-based tertiary air measurement system for cement kilns

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The new solution promisescontinuous, real-time tertiary air flow measurement in cement plant operations.

PROMECON GmbH has launched the McON IR Compact, an infrared-based measuring system designed to deliver continuous, real-time tertiary air flow measurement in cement plant operations. The system addresses the longstanding process control challenge of accurate tertiary air monitoring under extreme kiln conditions. It uses patented infrared time-of-flight measurement technology that operates without calibration or maintenance intervention.

Precise tertiary air measurement is a critical requirement for stable rotary kiln operation. The McON IR Compact is engineered to function reliably at temperatures up to 1,200°C and in the presence of abrasive clinker dust. Its vector-based digital measurement architecture ensures that readings remain unaffected by swirl, dust deposits or drift. Due to these conditions conventional measurement systems in pyroprocess environments are often compromised.

The system is fully non-intrusive and requires no K-factors, recalibration or periodic readjustment, enabling years of uninterrupted operation. This design directly supports plant availability and reduces the maintenance overhead typically associated with process instrumentation in high-temperature zones.

PROMECON has deployed the McON IR Compact at multiple cement facilities, including Warta Cement in Poland. Plant operators report that the system has aided in identifying blockages, optimising purging cycles for gas burners, and supplying accurate flow data for AI-based process optimisation programmes. The practical outcomes include more stable kiln operation, improved process control, and earlier detection of process disturbances.

On the energy side, real-time tertiary air data enables reduction in induced draft fan load and helps flatten process oscillations across the pyroprocess. This translates to lower fuel and energy consumption, fewer unplanned shutdowns, and a measurable reduction in NOx peaks. This directly reflects on the downstream cost implications for plants operating SCR or SNCR systems for emissions compliance.

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Concrete

Adani Group To Set Up Cement Factory In Madhya Pradesh

Chief Minister Mohan Yadav inaugurates plant in Guna

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Adani Group (Adani) will set up a cement factory in Madhya Pradesh, the chief minister of the state announced after an inauguration ceremony in Guna. The chief minister, Mohan Yadav, described the occasion as a historic day for the state and said the project will strengthen industrial capacity. The event was presented as a milestone in efforts to broaden manufacturing and attract large-scale investment. Officials said the facility will add to regional production capability and support related industries.

State officials outlined that the plant will enhance supply chains for construction and infrastructure projects across the region. The company will bring technical expertise and logistical resources to the site, with government agencies coordinating approvals and land allocation. Local suppliers and service providers will benefit from increased demand, and training initiatives will be developed to build workforce readiness. Officials indicated that the project complements broader plans to modernise industrial clusters in the state.

The state administration said it has facilitated clearances and infrastructure support to accelerate implementation. Local officials have coordinated with the company to ensure connectivity and utilities are in place ahead of commissioning. The chief minister emphasised that collaboration between private investors and the government aims to create sustainable economic growth. Community outreach programmes will address local concerns and establish grievance mechanisms as construction proceeds.

Officials said the inauguration in Guna marks a new phase in the state industrial story and will serve as a reference for future investments. Administrators noted that close monitoring and periodic reviews will guide timely execution and adherence to environmental and safety norms. The government affirmed its commitment to facilitating responsible industrial expansion while ensuring benefits reach local communities. Stakeholders will continue discussions on supply chain integration and long term maintenance arrangements.

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Concrete

Railways Boost Cement Movement by 170 Per Cent and Eye Fly Ash

New container wagons cut costs and speed turnaround

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Indian Railways has recorded a 170 per cent rise in cement movement in the last four months after reforms launched in November to promote rail based bulk cement logistics. The Union Railway Minister, Ashwini Vaishnaw, reviewed the container sector reforms and their implementation and described the shift as improving plant to market efficiency. The reforms introduced customised bulk cement tank containers and a bulk cement terminal policy to support multimodal handling and door to door solutions.

The new system has simplified loading and unloading by enabling mechanised operations and by reducing package losses compared with bagged cement transport. Since cement can move directly from manufacturing centres to consumption centres in standardised tank containers compatible with Ready Mix Concrete machines, two stages of handling have been eliminated and material loss has been reduced. The standard shape of the containers facilitates faster turnaround and lowers logistics costs for suppliers and builders.

The improved freight turnaround is helping to lower the delivered cost of cement, which can ease pressure on housing costs for the poor and middle class and support affordable construction. The reform is said to be environment friendly as dust generation during material transfer has fallen and fuel consumption and emissions have reduced due to modal shift from road to rail. The Make in India tank containers are designed for seamless movement between train and trailer and to enable efficient door to door movement while cutting congestion on roads.

Building on the cement reforms, officials were urged to tap the fly ash transportation market to convert industrial waste into national wealth. The minister noted that nearly 300 million metric tonnes (mn t) of fly ash is produced in the country while only about 13 million t is transported by rail and asked officials to substantially increase Railways share to serve brick kilns, cement industries and construction sites. Wider utilisation of fly ash should reduce pollution, promote recycling and lower construction material costs while strengthening sustainable freight movement across infrastructure sectors.

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