Displaying items by tag: blended cement

The Indonesian government emphasised its intention this week to use ‘green’ cement in the construction of its new capital city Nusantara in Borneo. However, this begs the question: what exactly is ‘green’ cement?

In this case, Mohammad Zainal Fatah, the secretary general of the Ministry of Public Works and Public Housing, told state media that his department was “seeking to encourage the supply of domestic-industry-based material resources and construction equipment, which can support sustainable infrastructure development principles." The ministry is working with state-owned cement producers such as Semen Indonesia (SIG) to ensure the provision of sustainable cement and related products. SIG was selected as a supplier for the project in late 2022 and, as of February 2024, has reportedly provided 400,000t of cement from its plants at Balikpapan and Samarinda.

This is admirable stuff. However, the timing of the announcement is curious given that both the head and deputy head of the Nusantara Capital City Authority resigned this week forcing the government to reassure investors that the project was still on. Cue some swift discussion about ‘green’ cement! Previously it was hoped that the first phase of the US$34bn project could be inaugurated on the country’s independence day in August 2024 with civil servants scheduled to start relocating to the site in the autumn.

SIG sells a number of ‘green’ blended cement products and some of these have received Green Label Cement certification from the Green Product Council Indonesia. The group says that these products have contributed up to a 38% drop in CO₂ emissions compared to Ordinary Portland Cement (OPC). This compares to the group’s clinker factor reduction rate of 69% and its Scope 1 emissions intensity reduction of 17% to 585kg/CO₂/t of cement in 2023 compared to 2010 levels.

Along similar lines, the Alliance for Low-Carbon Cement & Concrete (ALCCC) in Belgium also announced this week that it had released a new policy roadmap aimed at achieving net zero emissions by 2040. Amongst its recommendations were a focus on the standards for cement and concrete to promote low-carbon products and encouragement to create lead markets to develop demand for them.

Crucially, the ALCCC uses low-carbon cement in place of ‘green’ cement and this makes its definition clearer. ‘Green’ cement is a marketing term intended to associate cement with environmentalism. Yet there is no accepted definition describing how these products are more sustainable than, say, OPC. For example, a so-called ‘green’ cement could use 100% clinker manufactured with no CO₂ emissions-abatement, but it might be sustainable in other ways such as saving water. For the purposes of this article we’ll assume that ‘green’ cement means a low-carbon one. To further add to the confusion, ‘green’ concrete can be made using OPC in various ways but that’s beyond the scope of this piece. Clearly the world could do with some universal definitions.

US-based research and consulting company Global Efficiency Intelligence came to the same conclusion when it published its ‘What are Green Cement and Concrete?’ report in December 2023. It decided that - despite there being plenty of standards, protocols, and initiatives - there is no general agreement on the definition of ‘green’ cement or concrete. Its emissions intensity for cement summary table can be viewed below. It demonstrates the massive range of emissions intensity between the various standards. It is worth noting here that the description the Indonesian government may have been using for ‘green’ cement could already meet SIG’s Scope 1 emissions intensity reduction for its cement in 2023 depending on the standard being used.

Table 1: Emissions intensity definition for cement as stated by standards, protocols, initiatives, and policies with stated numerical quantity targets. Source: Global Efficiency Intelligence.

Part of the problem here is that there is a language gap between the simple definition of a cement that is less CO₂ emissions-intensive than OPC and the technical definitions used in the specifications and standards. Simply describing a cement product as ‘green’ can potentially cover anything that is slightly better than OPC down to a bona-fide net-zero product. Added to this is pressure from the manufacturers of new and existing cement products that use less or no OPC for regulators to move to performance-based standards to replace existing prescriptive standards, because it makes it easier for their products to be used. For more on this issue see Global Cement Weekly #606. Cement associations such as Cembureau and the Global Cement and Concrete Association (GCCA) have also called in their respective net zero roadmaps for changes to the standards system to promote low-carbon cement and concrete products.

The answer to what is ‘green’ cement is whatever the promoters want it to be. So, it might be helpful if the use of the word ‘green’ were banned in connection to any marketing activity related to cement products. Everyone could then adopt some kind of universal grading system using simpler language. One approach might be to copy the colour-coding scheme used by hydrogen to describe how it is made. One could use yellow for limestone blends, silver for slag, orange for clay, black for OPC made with carbon capture and so on… but not green! Another route might be to mandate the use of the carbon labels that some cement producers have used for at least a decade. Or something like the alphabet energy rating system used in the UK and EU for electrical appliances could be used. It’s too much to hope for a global system but simpler systems in the main markets would make it much easier to determine what exactly is ‘green’ cement.

Peter Edwards, Editor of Global Cement Magazine, discusses ‘sustainable’ cement in The Last Word in the June 2023 issue

US: Holcim has completed a major expansion of its cement holding facility in North Fremont, allowing the plant to meet ‘growing’ market demands in the Omaha region. The US$20m project includes additional rail capacity, a new 50,000t cement dome, an extra silo and a blender for product mixing.

According to the company, the facility now employs seven staff members, up from three, and fulfils the Nebraska Department of Transportation's blended cement requirements using natural pozzolan to create a lower-carbon product.

Holcim's head of US Corporate Communications, Lynn Safranek, said "The availability of extra cement storage and the addition of rail capacity means fewer trips to transport cement from Holcim’s plant in Ste. Genevieve, Missouri, and more reliance on train transportation, which is more efficient than other land-based alternatives.”

Heidelberg Materials announced this week that it is preparing to close its integrated cement plants at Beffes and Villiers-au-Bouin in France by October 2025. It framed the restructuring as a response to ‘a significant decline in cement sales in France’ and a plan to focus on low-carbon products. Unfortunately, local media reported that around 170 jobs will be lost at the two sites. The company says it is looking at ‘socially acceptable solutions’ including redeployment to other locations in the country.

Investment has been forthcoming from Heidelberg Materials France in recent years. It reminded everyone that it initiated a Euro400m scheme at its France-based subsidiary Ciments Calcia in late 2020. Most of this was earmarked towards a new production line at the Airvault plant, which is currently being built. Other schemes at the Beaucaire, Bussac-Forêt and Couvrot integrated plants followed. More recently, Heidelberg Materials launched a carbon capture, utilisation and storage (CCUS) project at Airvault, part of the GOCO2 initiative, with the aim of starting initial capture in 2030 with full 1Mt/yr capture planned later. What the company didn’t mention though was at the time of that 2020 investment it was also preparing to convert the integrated Gargenville plant into a grinding unit, stop white cement production at its Cruas plant with the intention of turning the site into a terminal and it wanted to reduce its workforce by around 140. To be fair to Heidelberg Materials though, it did have the same goal of reducing its specific net CO₂ emissions. The added detail this week was that the group aims to generate half of its revenue from sustainable products that are either low-carbon or circular by 2030.

Heidelberg Materials France is not alone with its ambitions for low-carbon products. Holcim notably opened in early 2023 what it said was the first calcined clay unit in Europe at its Saint-Pierre-la-Cour cement plant. Heidelberg Materials then followed in May 2023 with the announcement of a calcined clay project at its Bussac-Forêt cement plant. Other clay projects from Vicat, NeoCem and Neo-Eco have been reported since then. The other prominent France-based blended cement producer that has steadily been building its business in recent years is Hoffmann Green Cement. More general plant upgrade projects that are also worth mentioning include Eqiom’s (CRH) upgrade to its Lumbres plant in February 2024 and the ignition of a new kiln at Lafarge France’s Martres-Tolosane plant in October 2023. Both of these projects have been framed as driving sustainability.

Graph 1: Cement production in France, 2014 - 2022. Source: France Ciment.

Heidelberg Materials’ assessment about the poor state of the cement market has been confirmed by local media. Sales reportedly started falling in 2022, were down by 6% year-on-year in 2023 and further downward pressure is expected in 2024. Production data shown in Graph 1 above released by France Ciment, the national cement association, doesn’t really show what has been happening with sales. Over the last 20 years production hit a high of around 22Mt in the mid-2000s before settling around 16 - 17Mt/yr from 2015 onwards. The more telling trend, perhaps, has been the increase in CEM II blended cements from 50% in 2012 to 64% in 2022. Cement production may have stayed roughly the same over the last decade but it is using less clinker than it used to. Hence the pressure on companies like Ciments Calcia to reduce clinker capacity.

A further cost pressure facing cement producers in France is the impending end to the price cap on electricity scheduled by the end of 2025. The government enacted the scheme in late 2021 at the end of the Covid-19 pandemic, but then carried on as energy prices spiked following the Russian invasion of Ukraine. France Ciment lobbied in August 2023 for further protection for the sector using the argument that decarbonisation was not possible without electricity available for a reasonable price. It added that decarbonising the cement sector in France with carbon capture would cost around Euro3.5bn. Electricity prices started rising in February 2024 as part of the government’s phase out of the scheme.

Finally, 17 people were arrested on 5 April 2024 in connection with a demonstration at Lafarge France’s Val-de-Reuil ready-mixed concrete plant in Eure. Environmental activists reportedly trespassed on the site, according to local press, causing an estimated Euro450,000 in damages with acts such as spraying foam into machinery, ripping up bags of cement, breaking windows and more. The activists presented their actions as a response to both the environmental impact of cement and concrete production and the ongoing legal allegations about Lafarge’s actions in Syria in the early 2010s. Lafarge France’s La Malle integrated plant was also similarly targeted in December 2022 when around 200 activists stormed the site and caused damage to machinery and property. Lafarge’s response at the time was to remark that there was a feeling of misunderstanding given that the La Malle plant was piloting various decarbonisation methods.
All of this presents a febrile picture of the cement sector in France. Sales are down, electricity costs are set to go up and producers are switching to low-carbon cement products. Alongside this they are also closing clinker production plants but are also investing in new decarbonisation projects. At the same time environmental protestors have also been targeting cement and concrete plants and Lafarge’s association with its former actions in Syria appear to have made it more of a target than the other manufacturers. It is unsurprising then that Holcim, the parent company of Lafarge France, has raised the risk of damage to the group’s reputation, with both the general public and investors, should it fail to meet its targets. Reaching net zero was never going to be easy but setting unrealistic targets is increasingly not an option.

China: A new study from Hong Kong Polytechnic University showcases sustainable cement production methods, focusing on low-clinker cements and alternative solutions for incinerator fly ash (IFA). The research demonstrates that using carbonated-washed IFA mixed with slag, coal fly ash, or metakaolin can replace 60% of Portland cement, forming ternary blended cement. This approach reportedly reduces the carbon footprint of cement production.

The study found that slag was the most effective, improving pore structure and increasing ettringite and hemicarboaluminate formation with a blend of 40% slag and 20% IFA. It achieved 90% of the compressive strength of pure Portland cement after 90 days.

The researchers said "This study demonstrated the promising potential of the blended cements to simultaneously divert IFA from landfills and reduce the clinker content of cement."

US: Holcim US has announced an investment of US$20.5m in its Midwest operations. A key component of the investment is the new 35m-high cement storage dome in Fremont, Nebraska, which will increase its production capacity of ECOPlanet low-carbon cement. The dome has the capacity to store 50,000t of cement. Construction of the dome, which began in 2021, has contributed to local economic development and job creation at the terminal.

In line with the Nebraska Department of Transportation's blended cement requirement, the cement blended and distributed at the terminal incorporates natural pozzolan, a binding agent, to produce a lower carbon product compared to ordinary Portland cement.

The Portland Cement Association (PCA) is currently considering changing its name as part of a wider rebranding exercise. As the PCA’s president and CEO Mike Ireland puts it, “Portland cement no longer adequately represents the products PCA member companies manufacture, as they increasingly produce blended cements in today's environmentally conscious marketplace.” The exercise opens up a host of issues about the promotion of cement and concrete and the role of a trade association in the 21st century.

The reason the PCA holds its name is because ordinary Portland cement (OPC) became the most popular type of cement used to make concrete (and other building materials) in the second half of the 19th century. This continued in the 20th century without any issues. So naming a national cement association after the sector’s key product made sense at the time. The parent organisation that became the PCA was formed in 1902 and the PCA proper officially started in 1916 when cement producers met in Chicago and agreed to set up an expanded organisation.

One topic that was less of an issue in 1916, was considering a national cement association in an international context. Or in other words, should a national or regional cement association say where it is from in its name? Many associations do so elsewhere in the world but not all. Cembureau in Europe, the Cement Manufacturers’ Association in India and the Mineral Products Association in the UK for instance are three examples that do not. The PCA’s current name does not indicate where it is based and it has appeared to have coped for over 100 years. Curiously though, most of the suggestions that the PCA has put forward for its potential new name do include ‘America’ in some shape or form. Another connected problem is whether the general public in the US make the assumption that the PCA is a smaller group based in Portland, Oregon!

Mike Ireland points out another dilemma facing the PCA today with the rise in popularity of blended cements. The PCA, for example, worked on supporting the use of Portland Limestone Cement in the 2010s before lots of US producers started making it in the 2020s. To illustrate the scale of the change that this and other initiatives have created, United States Geological Survey (USGS) data shows that shipments of blended cements doubled from 26Mt in 2022 to just under 55Mt 2023. At the same time, shipments of Portland Cement fell by 37% year-on-year to around 52Mt from 83Mt. More blended cements were shipped in the US than OPC in 2023. So the PCA finds itself named after a minority cement product.

The other issue that Ireland touches upon is the environmental perception of cement by the general public and the problems for marketing, branding and advocacy this presents to a trade association. Simply put, it is far easier for the environmental lobby in developed economies to portray cement as ‘bad’ than it is for the cement sector to publicise the many small but incremental changes it has made or the monumental effect that cement and concrete have made upon human society over the last 150 years. Although it may not mean much to the wider public, to whom ‘cement is cement,’ the rise of blended cements in the US has handed the PCA the opportunity to differentiate cement into ‘good’ and ‘bad’ offerings. In this case high CO₂ emitting OPC becomes the old dirty product of the past and blended cements become clean shiny symbols of the future. It follows, therefore, that retaining the name of an old product for one of the biggest cement associations in the world might be considered unhelpful.

In some respects OPC and the PCA have become victims of their own success. Cement built the modern world and has become ubiquitous. So commonplace in most countries, in fact, that people outside of the building industry often fail to realise how crucial the stuff is. The tricky proposition for those marketing cement today is to somehow recognise the historical contribution that it has made to build our world whilst also conveying how it is changing to become more sustainable. Unfortunately for fans of OPC though this may mean dumping it from the name of the PCA.

US: Eagle Materials has outlined its climate change mitigation successes in its 2023 Sustainability Report. During 2023, the company increased its production of blended cement products, including Portland Limestone Cement (PLC). It commenced a major CO2 reduction study with the US Department of Energy, and established a Greenhouse Gas Reduction Team to explore new clean technologies. Eagle Materials says that it is currently working to increase the use of alternative fuels at three of its cement plants.

UK: Holcim subsidiary Aggregate Industries has commenced its construction of a cement blending plant and import hub on the River Thames at the Port of Tilbury in Essex. The facility also includes units for the production of reduced-CO₂ cement components, including ground granulated blast furnace slag (GGBFS) and construction demolition waste (CDW)-based materials. The Tilbury site has five loading heads and will help Aggregate Industries to maintain its continuous supply of conventional, reduced-CO₂ and circular cementitious materials to London and South East England.

Chief executive officer Dragan Maksimovic said “This important investment will further strengthen our position in the market, allowing us to drive our sustainability ambitions and lead the way in low carbon and circular building materials. The London and South East construction market has major regional projects on the horizon, and we are primed and ready to meet the region’s rising demand for sustainable solutions.”

Steve Curley, managing director cement, added “Our ECOPlanet range of green cement was recently added to our green offering. By investing in this impressive facility within the Port of Tilbury, we will truly boost our sustainable offering and be more agile and efficient in the way we manufacture, transport and supply our products across this region.”

Philippines: Holcim Philippines recorded sales of US$332m during the first nine months of 2023. This represents a 4% drop from nine-month 2022 levels. The producer reported operating earnings before interest and taxation (EBIT) of US$25.2m. Throughout the period, Holcim Philippines co-processed 800,000t of alternative fuel (AF) at its plants. Blended cement products ended September 2023 at 75% of its cement sales.

India: Ratings agency ICRA says that the cement industry in India will reach a renewable energy reliance of 40% across its operations in the 2025 financial year. The Hitavada newspaper has reported that this will involve the construction of 537MW-worth of new renewable power capacity. During the 2023 financial year, which ended on 31 March 2023, producers used 35% renewable energy. ICRA said that they can expect to make costs savings of US$240m/yr from 2025 through the scale-up of renewables, including solar, wind and waste heat recovery. This would correspond to a 15 – 18% reduction of estimated energy costs for the 2025 financial year.

Over the same two-year period, ICRA forecast blended cements to rise to 81% of cement sales in the 2025 financial year, from 78% in the 2023 financial year.