Nobody could have imagined of creating building materials made of crop residues and industrial by-products. But GreenJams have revolutionised the way building materials are being manufactured. Tarun Jami, the Founder of GreenJams, spent five years studying hempcrete academically to equip himself with the technical skills to create a carbon-negative product, and after a lot of trials and tribulations, he invented Agrocrete–a carbon-negative building material comprising of crop residues and a lime-based binder. While Agrocrete is a scientific anomaly, the most amazing aspect about it is that it augments farmers??income, keeps the air clean, and generates rural employment. It is carbon-negative and helps reverse climate change too.
??reen??and ??nvironmentally efficient??products have become the buzzwords today. The Indian cement and construction industry is working effectively towards reducing carbon footprints and meeting sustainability targets. Calcination and clinker-making process are the biggest contributors to CO2 emission. About 7-8 per cent of global carbon emissions come from clinker manufacturing alone. Materials like fly ash bricks, AAC blocks, and any other novel building materials use clinker-based cement.
Cemet production is a significant source of global carbon dioxide (CO2) emissions. About 7-8 per cent of global carbon emissions come from clinker manufacturing alone. So, what is the solution? GreenJams has an answer to this problem too. The company has come up with another innovative product called BINDR?? 100 per cent upcycled product that can help cement companies cut their carbon footprint by more than 80 per cent when compared to regular Portland cement.
Below are excerpts from the interview with Tarun Jami, the Founder of GreenJams.
How did you start your journey towards making a carbon-neutral building material for the construction industry?
Late during my undergrad days of studying civil engineering, I had come across the topic-what climate change is and the impact that construction activities have on it. Since then, I got conscious of what destruction construction would cause to our environment. Ever since I developed this conviction, I was on the lookout for technologies and materials that would help make construction less harmful to the environment.
Towards the end of my engineering, I had stumbled upon a building material called hempcrete. It was carbon-negative and was made of hemp, and it felt like I had discovered a wonderland. I suddenly realised that with this hempcrete, we could make construction better for the planet. Can you imagine that construction could help reverse climate change? That epiphany set me on a journey that took me this far.
Could you brief us about your innovative product BINDR– a low-carbon replacement of Portland cement? Does it qualify for all quality and strength tests? How is it better than Portland cement?
BINDR is a 100 per cent up-cycled replacement of Portland cement with a characteristic strength equivalent to 43 grade OPC. We aren?? yet claiming structural capabilities for BINDR since we haven?? yet proven its long-term durability. Being a 100 per cent upcycled product, we can cut its carbon footprint by more than 80 per cent when compared to regular Portland cement. At 0.1 kg CO2/kg, the embodied carbon can?? go lower than this at this price point.
Agrocrete is made from crop residue. You have changed the traditional processes. How did you think of such an innovative idea? How was the response in the market in the beginning?
Agrocrete came out of a lot of trials and tribulations. It emerged as a response to a much deeper societal problem in India. About 44 per cent of Delhi-NCR?? poor winter air quality is because of crop residue burning. Almost 100 million tonnes of crop residues are burnt annually in India, leading to almost 2 lakh crore of economic loss to the country. I almost crashed my car on my visit to Delhi in late 2019 because of the impact that poor air quality had on my health. While Agrocrete is a scientific anomaly, the most amazing aspect about it is the fact that it augments farmers??income, keeps the air clean, and generates rural employment. It is carbon-negative and helps reverse climate change too. In the beginning, the market response was very skeptical and it still is. I get questions on fire resistance, decay, and durability of the blocks, which are all great, by the way.
Were there any hurdles you faced? How did you overcome them?
There were so many hurdles we faced. The biggest hurdles were technical and financial. While we somehow managed to solve the financial hurdles, the technical ones were more difficult to overcome. I spent five years studying hempcrete academically to equip myself with the technical skills to create Agrocrete. In 2017 I had started my Ph.D. at CSIR-Central Building Research Institute (CSIR-CBRI), Roorkee.
How cost-effective is your Agrocrete product? Does it offer faster completion of a project? How? Could you tell us about the manufacturing process of Agrocrete material? What kind of technology was involved?
Agrocrete helps reduce the cost of construction by almost 50 per cent in comparison to red bricks. The larger block sizes enabled by the significantly lesser weight help make it easy to work with for the masons. We are able to reduce the mortar joints by more than 60 per cent and the plaster requirements by almost 50 per cent because of the cleaner finish. The construction speed is up by almost 2.5X. Agrocrete manufacturing is a completely zero-emissions process. We utilise a patent-pending advanced alkali activation chemical technology. We do not use any furnaces and use latent chemical reactions to achieve strength.
Calcination and clinker-making process are the biggest contributors to CO2 emission. Please share your thoughts on how you can make a difference in this space.
About 7-8 per cent of global carbon emissions come from clinker manufacturing alone. Any reduction in clinker production is beneficial for the planet and humankind. Also, fly ash bricks, AAC blocks, and any other novel building materials use clinker-based cement which contribute a significant sum to the products??embodied carbon. BINDR could potentially be used to make all these products. Furthermore, by making mortars for block work and plastering, we can reduce the carbon footprint of buildings.
Tell us about the office space that you converted into a manufacturing unit at Roorkee
We built our manufacturing unit from scratch in Roorkee. We built this 1100 sq. ft. industrial building in four days flat at a cost of only Rs 200 /sq. ft. We were able to capture a total of 3.1 tons of carbon dioxide, making it carbon negative. We were able to achieve a 30 percent lesser cost of construction as compared to red bricks by reducing the mortar joints and construction time by 60 per cent. Our Roorkee manufacturing facility was built at Rs 2 lakh, which would have otherwise cost about Rs 5 lakh if we had built it using red bricks. We were able to reduce the mortar joints by more than 60 per cent and increased construction pace by 2.5x and consequently reduced labour costs.
Could you tell us about the ongoing projects and the cost and material involved in it? Any business expansion plans?
We are currently working on supplying Agrocrete hollow and solid blocks and BINDR to multiple residential projects in Punjab, Haryana, Uttarakhand, Delhi-NCR, and Uttar Pradesh. These are individual residences being built by private clients for themselves and the total number of Agrocrete hollow and solid blocks we are supplying are almost 1,00,000 units and BINDR will be about 200 bags.
We are currently in the process of setting up a brand new 2,000 blocks per day manufacturing facility in Visakhapatnam, Andhra Pradesh. The facility is expected to be operational in the next two to three months. We have received an overwhelming number of enquiries since July 13, 2021 from Karnataka, Maharashtra and Telangana and are looking for franchising partners who could set up the Agrocrete blocks manufacturing facilities in these markets.
A lot of well-established brands claim to be ??/strong>green??and ??nvironmentally efficient?? Your thoughts on this? Do you think the Indian cement & construction industry is on the right path towards sustainability?
The problem with the industry is that the benchmarks for ??reen??are getting higher and higher. Also, many products are greenwashed and do not consider lifecycle environmental impacts. With greenwashing becoming rampant, consumers and competitors are going to ask more difficult questions that manufacturers will have to be ready for. The Indian cement industry specifically is one of the greenest in the world. The average embodied carbon of Indian cement is much lower than the global average. With many companies committing to becoming carbon-neutral or even carbon-negative, I think we are on the right path towards sustainability. But it?? also time to now shift focus towards biodiversity and similar pursuits.
What are your plans in terms of adding more to product portfolio, investments, research, and development?
We have always been focused on research and development. Our team is capable, fast, and enterprising enough to develop new products that satisfy customer demands. In fact, our Agrocrete Plaster was created in response to a customer?? request. We are also looking to launch a range of carbon-negative home d?cor products under a new brand name called Sanscrete. It could potentially be the world?? first carbon-negative home d?cor brand. Sanscrete will focus on objects for home d?cor, and corporate and wedding gifting. We are currently looking to raise our first seed round and are inviting angel investors and HNIs to come to speak to us.
Indian Cement Review (ICR) and Fuller Technologies brought industry, policy and technology leaders together to discuss how cement innovation can drive green construction at scale, writes Rakesh Rao.
India is building at a pace few countries can match. Highways, airports, housing, logistics parks, industrial corridors and urban infrastructure are reshaping the country’s economic geography. But beneath this growth story lies a difficult question: can India continue to build at scale without locking itself into a high-carbon future?
That question formed the core of an online panel discussion titled “Driving Green Construction Through Cement Innovation”, organised by Indian Cement Review (ICR) in association with Fuller Technologies as the Presenting Partner on June 25, 2026. The webinar brought together experts from cement technology, R&D, global industry platforms, building performance policy and international development cooperation to examine how low-carbon cement and material innovation can accelerate India’s green construction transition.
The discussion came at a crucial time. India has committed to achieving net-zero emissions by 2070 and reducing the carbon intensity of its economy by 45 per cent by 2030. At the same time, the country’s construction sector is expanding rapidly, driven by urbanisation, infrastructure development, housing demand and industrial growth. Cement, as one of the most widely used construction materials, sits at the heart of this transition. It is indispensable to development, but also central to the challenge of reducing embodied carbon in buildings and infrastructure.
Moderated by Nitika Krishan, Senior Urban Infrastructure and Sustainable Policy Consultant, the panel featured:
Dr Hemantkumar Aiyer, VP and Head R&D, Nuvoco Vistas Corp Ltd;
Devika Wattal, Innovation Lead, Global Cement and Concrete Association (GCCA);
Dr Sunita Purushottam, MD, GBPN India (Global Buildings Performance Network); and
Vaibhav Rathi, Senior Technical Advisor, GIZ (the German Agency for International Cooperation)
Setting the tone for the discussion, Nitika Krishan underlined the scale of the challenge before the sector. “The question before us is no longer whether we build, but how we build sustainably,” she said. She pointed out that construction accounts for nearly 40 per cent of global energy-related carbon emissions when both operational and embodied carbon are considered. Cement production, she added, remains one of the hardest industrial processes to decarbonise.
For India, this is not merely an environmental issue. It is a development issue, a competitiveness issue and increasingly, a market issue. As one of the world’s largest cement producers and among the fastest-growing construction markets, India’s material choices will influence the carbon trajectory of its built environment for decades. As Krishan observed, sustainability solutions in economies such as India must not remain limited to laboratory success. They must be scalable, commercially viable and practical at national level.
The innovation gap: From technology to market
Experts believe that there is a need to bridge the innovation gaps for making decarbonisation in cement and concrete scalable. Devika Wattal of GCCA, explained, “The starting point must be the core cement manufacturing process itself. The first and foremost is the heart of our process, the heart of cement manufacturing. How do we reduce clinker? That is always a topic where industry is working very intrinsically.”
Clinker reduction remains one of the most important pathways for lowering emissions in cement. Since clinker production is energy-intensive and chemically emits carbon dioxide, reducing the clinker factor through supplementary cementitious materials (SCMs), blended cements and new chemistries can have a significant impact. Wattal also noted that carbon capture, utilisation and storage (CCUS) will have a role, though it may not be the first lever for all markets.
However, she stressed that innovation cannot stop at technology development. A solution that works in the lab must also be adaptable to industry, scalable in production and acceptable in construction practice. “It is important for that innovation to be adaptable, to be scalable, and so that it can be executed in real time,” she said.
Wattal also called for stronger enabling systems around innovation. These include performance-based standards, product-level embodied carbon databases and clearer frameworks for evaluating green materials. Without these, low-carbon cement products may struggle to compete with conventional materials in procurement and design.
R&D must balance carbon, cost and performance
Bringing in the R&D perspective into the discussion, Dr Hemantkumar Aiyer of Nuvoco Vistas emphasised that low-carbon cement development cannot be treated as a single-variable exercise. Cement must perform in real construction conditions. It must deliver strength, durability, consistency and cost competitiveness, while also reducing carbon.
“The root of understanding and balancing all these aspects lies in materials, and knowing the materials,” he said.
According to Dr Aiyer, R&D teams must understand the variability of raw materials such as fly ash, slag and clinker. Different sources produce different material behaviours. This makes mix optimisation, material characterisation and processing-property relationships critical. When performance is affected, cement manufacturers must understand how strength enhancers, admixtures and other performance chemicals interact with the material system.
He also linked material science with process efficiency. Clinkerisation takes place at extremely high temperatures, around 1,400 to 1,450 degrees Celsius. Any improvement in raw mix design, process control or energy optimisation can, therefore, help reduce emissions and cost. Dr Aiyer pointed to artificial intelligence-based optimisation, Cement 4.0 tools and advanced software as important enablers for real-time process and material control.
“The more you understand the materials, the more you can control it,” he said.
LC3: The promise is proven, the sequencing is not
Limestone calcined clay cement, commonly referred to as LC3, has attracted global attention because it can reduce clinker content significantly by using calcined clay and limestone while maintaining performance in many applications. Kiranmai Sanagavarapu of Fuller Technologies said the technology itself has already moved beyond proof of concept. Fuller Technologies has worked with calcined clay technology for nearly two decades and has seen plants running in France and Ghana. These plants, she said, are meeting local and national specifications, while the economics are beginning to make sense.
“The calciner is performing, the economics is stacking up, it is making business sense to produce,” she said.
But if the technology is viable, why has adoption not scaled faster? For Sanagavarapu, the answer lies in project sequencing. Too often, clay characterisation happens after equipment is specified. This, she warned, is a backward approach because calciner design depends on clay mineralogy, kaolinite content, iron levels, reactivity, moisture and other variables.
“If you don’t know what your deposit looks like before you commit for the equipment, you are, in a way, going blind into designing,” she said.
She also identified permitting and plant integration as major bottlenecks. Environmental clearances, mining permissions and local regulatory approvals must begin early. Similarly, calcined clay must be integrated into existing grinding, blending and logistics systems from the design stage, not treated as an afterthought during commissioning.
India already has IS 18189:2023 standard for LC3, but Sanagavarapu pointed out that the standard is not yet visible enough in procurement documents. “The gap between what is technically being permitted and what the procurement is asking is the single biggest bottleneck,” she said.
In her view, successful scale-up depends on getting the sequence right: clay characterisation first, permitting in parallel, standards aligned with construction, and integration built into plant design.
India’s LC3 journey: Progress, but demand remains thin
Providing details of India’s LC3 commercialisation experience, Vaibhav Rathi of GIZ noted that JK Cement carried out the first commercial production of LC3 at its Rajasthan plant, followed by JK Lakshmi Cement three months later. These initiatives were supported by the International Climate Initiative of the Government of Germany, with IIT Delhi contributing deep institutional knowledge on LC3 research and BIS certification.
Rathi said India’s early experience has produced clear lessons. One of the biggest was the need to build capacity among regulators. While BIS certification existed, State Pollution Control Boards were unfamiliar with the technology and unsure about the approval pathway.
“The capacity building is not just needed amongst the producer and the users of the cement, but also the regulators who are working with this technology for the first time,” he said.
He also highlighted the need for better information on China clay deposits. Since China clay is currently classified as a minor mineral, centralised data on availability, quality and location is limited. If cement manufacturers are to adopt LC3 at scale, stronger mineral intelligence will be important.
The third issue is demand. LC3 has already been used in projects such as Palava City in Mumbai and Noida International Airport, but these remain limited examples. “It is in a chicken and egg situation,” Rathi said. “Cement companies are saying we need more demand, and users are saying there is not enough cement available.”
Public procurement, he suggested, could help break this cycle. If agencies such as CPWD and other public bodies begin testing, accepting and specifying LC3, it could create the market confidence needed for cement companies to invest in production and storage.
Building codes must catch up with innovation
Dr Sunita Purushottam of GBPN India argued that material choices will determine built environment emissions over the long term, but India’s current policy signals remain fragmented. Although LC3 has received BIS recognition, she pointed out that building codes, municipal bylaws, schedules of rates and sustainability codes do not yet provide uniform guidance on low-carbon cement.
“The current cement regulations are largely prescriptive and favouring traditional materials,” she said. This limits the ability of alternative materials to compete on performance, durability and emissions.
Dr Purushottam also raised the issue of taxation. Cement, including LC3, currently falls under the same GST bracket as conventional cement. A differentiated tax structure, she argued, could help accelerate market adoption. “In order for the market to demand LC3, that differentiation in the GST could go a long way,” she said.
She noted that green building certifications such as IGBC and GRIHA are already creating demand for low-carbon materials by assigning points for embodied carbon and sustainable material use. However, she said large-scale adoption will require regulatory mandates, particularly through building codes and state-level notifications.
She also cautioned that low-carbon cement alone does not solve the entire building performance problem. A material may reduce embodied carbon, but the operational carbon of a building depends on thermal performance, design, insulation and energy use. “The energy part has two elements,” she said. “One is the embodied carbon of the material itself, and the other is the operational carbon.”
Collaboration is the bridge between invention and impact
Wattal said GCCA sees innovation as a strategic priority and works through platforms that connect industry with academia and start-ups. “There is no way we will decarbonise our sector without innovation,” she said.
However, she stressed that research must be connected to actual industry challenges. Innovations developed in isolation may fail when they encounter real-world barriers such as raw material variability, plant integration, cost, standards and finance. Start-ups, too, need industry mentorship and scale-up pathways.
Wattal also flagged the importance of finance. Even strong technologies may struggle to attract investment if there is no common understanding of bankability. “We have always put projects into, is this a bankable project? But the definition of a bankable project has never been defined,” she said.
For India, she saw strong potential in its academic and start-up ecosystem, but said the challenge lies in alignment and prioritisation. The country has the research base, industrial capacity and market size. What it now needs is a coordinated route from innovation to deployment.
There is a practical concern for cement manufacturers: how can existing plants be adapted for lower emissions without compromising reliability or commercial viability?
Kiranmai Sanagavarapu addressed, “The reliability risk in calcined clay retrofit is definitely real, but it is almost always self-inflicted. The risk arises when a new process is added to an existing circuit without properly redesigning grinding and blending configurations.”
Existing cement plants, she explained, can take two broad routes. The first is external sourcing of calcined clay combined with mill optimisation. This requires lower capital investment and can potentially move in 12 to 18 months if other conditions are in place. It may reduce emissions by around 20 to 30 per cent. The second route is integrated calcination on site, which requires higher capital expenditure and longer lead times, but provides greater control over quality, supply and emissions reduction potential.
For Sanagavarapu, the principle is simple: low-carbon retrofits must be designed with intent. “Design it with an intent properly from the start. Start in the market conditions where the economics are already working,” she said.
Circularity: The overlooked advantage
According to Vaibhav Rathi, fly ash and slag are already well established in cement and construction (C&D), but construction and demolition waste remains underutilised. “C&D waste is a growing business opportunity which not many have taken up,” he said. India’s continuous construction and demolition activity creates huge volumes of waste, much of which contributes to air pollution, land degradation and material inefficiency. With the right processing and standards, this waste can be converted into useful construction products.
Rathi also pointed out that LC3 has a circular economy dimension that is often overlooked. It can use low-grade kaolin-rich clay left behind after high-grade clay is extracted for other applications. “LC3 is not only a low-carbon solution, but also a circular economy solution,” he said.
At the same time, he cautioned that LC3 in India is not yet cheap because it has not reached scale. Site-specific techno-commercial feasibility studies, supported jointly by development agencies and industry, could help companies assess whether LC3 production makes technical and financial sense at a given location.
Dr Purushottam added that India must address both low-carbon cement and construction waste together. “Both low-carbon cement and C&D waste go hand in hand. India does not have an option but to work on both,” she said.
Dr Aiyer called for policy shifts from both government and industry, including preferential purchasing of sustainable materials, minimum supplementary cementitious material requirements in public and public-private projects, and faster regulatory implementation. “If we can fast-track the regulatory standards and their implementation on the ground, that is the way to go,” he said.
From green ambition to green construction
Cement innovation is no longer only about chemistry. It is about systems. Low-carbon cement will scale only when technology, standards, procurement, finance, regulation, education and construction practice move together.
LC3 and other low-carbon technologies have shown promise. India has early commercial examples, strong research capability and growing market interest. But mainstream adoption will depend on whether demand can be created, regulators can be capacitated, standards can be embedded in procurement, and manufacturers can see a clear business case.
For a country building at India’s scale, the opportunity is enormous. Cement will continue to be central to infrastructure and urban development. The challenge now is to ensure that the cement used in India’s growth story carries a lower carbon burden.
Rakesh Rao
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JK Cement gained after being declared preferred bidder for the Gilund Limestone Block in Chittorgarh, Rajasthan, a lease area of 370.96 hectares. The firm saw its shares trade at Rs. 5550.05, up by 28.45 points or 0.52 per cent from the previous close of Rs. 5521.60 on the BSE. The scrip opened at Rs. 5569.15 and touched a high of Rs. 5625.00 and a low of Rs. 5531.00.
The stock recorded turnover of 1742 shares on the counter and the BSE group A stock with face value Rs. 10 has a 52 week high of Rs. 7565.00 on 20-Aug-2025 and a 52 week low of Rs. 4670.05 on 12-Jun-2026. Last one week high and low stood at Rs. 5625.00 and Rs. 5329.00 respectively. The promoters holding in the company stood at 45.66 per cent, while institutions and non-institutions held 40.61 per cent and 13.73 per cent respectively.
The e-auction conducted by the Government of Rajasthan resulted in the company being declared preferred bidder for the mining lease, and the allocation will enable the company to plan phased development of the deposit, subject to regulatory approvals. The Gilund block spans 370.96 hectares and its allocation is intended to support raw material security for the company’s cement operations in the region. The designation follows the government auction process and will allow the company to plan development and integration of the deposit into its supply chain.
The current market capitalisation stands at Rs. 430.38 billion (bn), reflecting market response to the mining news and prevailing valuation levels for the sector. Investors and analysts will watch for formal allotment and related disclosures that can clarify timelines, capital expenditure and expected production profiles. The report is intended for informational purposes and does not constitute investment advice, and market participants are advised to consult advisers before making decisions.
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.
