Cementir Group is pursuing a clear strategy for climate change focussed on reducing CO2 emissions per tonne of cement by 30 per cent by 2030. A total of Euro100m is dedicated to green investments by 2022. A pivotal role in CO2 reduction will be played by futurecem™. Cementir’s proprietary technology that uses limestone and calcined clay to such an extent that it significantly reduces the amount of clinker in cement.

International Cement Review | September Issue, 2020

by Michele Di Marino, Group Chief Sales, Marketing & Commercial Development Officer & Stefano Zampaletta, Product Development Senior Specialist, Cementir Holding NV; René Fich Jespersen, Commercial Director of Aalborg Portland A/S

 

Improving the overall CO2 footprint is a priority for the Cementir Group, but clearly, a carbon-neutral future is not achievable by acting alone. At the end of 2019, Cementir Group accepted an additional challenge via its daughter company Aalborg Portland, supported by the Danish government in the most ambitious CO2 reduction project ever sponsored by a country, to provide its expertise and technology. In autumn 2019 the Danish government adopted a new binding climate law with the target of reducing Danish CO2 emissions by 70 per cent by 2030.

The target will be achieved through greater use of alternative fuels (approximately 80 per cent of the total required to produce grey cement by 2030) and renewable resources, as well as the reduction of thermal consumption and the clinker ratio of cement. A number of projects have been initiated and are progressing. A pivotal role in CO2 reduction will be played by futurecem™ – Cementir’s proprietary technology developed internally and patented worldwide – which allows over 40 per cent clinker replacement in cement.

Futurecem technology towards sustainable building solutions

Futurecem is the result of extensive applied research that has been developed over recent years at the Cementir Group Research and Quality Center in Aalborg, Denmark. The research covers the entire value chain: from raw materials assessment, through manufacturing technology and up to concrete technology.

The Futurecem technology’s novelty is the synergy between calcined clay and limestone filler that enables more than 40 per cent clinker replacement, whilst keeping the same performance of Portland cements. It can be used as a standard product with or without additions for concrete manufacturing.

This unique synergy was discovered approximately 20 years ago by Cementir Group researchers and then brought to attention when an increased focus on sustainable solution and climate change required new cement types with a reduced CO2 footprint. Thanks to its novel synergy, futurecem technology is granted for patent in the US, Canada, Mexico, Europe, India, China and Australia.

In short, futurecem technology enables the production of both greener and more sustainable cements.

The greener footprint is linked to a potential 30 per cent CO2 reduction in production emissions compared to ordinary Portland cement (OPC), as calcined clays are activated at a lower temperature than clinker with around 55 per cent of emission savings.

Better sustainability relies on its main constituents (ie, limestone and clay), which are largely available. In today’s industry this is a key factor to ensuring long-term, stable supplies. Fly ash and blast furnace, slag, the supplementary cementitious materials mostly used for cement/concrete production, are limited in quantity and availability. They are expected to decrease further as a result of CO2 emissions compliance by coal-fired power plants and the steel industry. Notably, in Europe fly ash shortages are beginning to be felt as coal-fired power plants are being shut down, while blastfurnace slag is almost fully used, with no plans to increase steel production.

The greener footprint is linked to a potential 30 per cent CO2 reduction in production emissions compared to ordinary Portland cement (OPC), as calcined clays are activated at a lower temperature than clinker with around 55 percent of emission savings.”

Futurecem technology is fully acknowledged as a solution for clinker ratio reduction in the roadmap for ‘Low carbon transition in the cement industry’ by the International Energy Agency (2018), and as “low-clinker cements” in the ‘Cementing the European Green Deal’ (2020), making Cementir Group the frontrunner.

A milestone within the development of futurecem technology has been the Danish Green Concrete II (Green Transformation of Cement and Concrete Production) project, concluded in 2019. The full value chain of construction and building materials, as well as universities and research institutes were actively involved.

Cements based on futurecem technology as well as concrete recipes have been developed and tested at full-scale constructions: ie, infrastructure elements (two bridges) and an indoor floor and wall in the new concrete laboratory at the Danish Technological Institute.

To also test and document durability in aggressive environments, a number of long-term exposure sites have been established, along with extensive laboratory testing. These demonstration structures have shown that futurecem is an effective solution for implementation in the concrete industry using conventional production and technologies, as well as demonstrating high resistance to the most aggressive environmental exposure classes, which is fundamental for concrete durability.

Beyond cement, futurecem technology is applied to the the manufacture of binder as well as addition to concrete.

Futurecem technology is the “core” stream for the Cementir Group innovation process, as the company aims to enhance its portfolio with value adding and innovative products/solutions and pursuing the challenging journey towards sustainability.

Within this stream of activities, Cementir Group has already launched two greener building solutions on the market based on premixes under its InWhite Solution™ platform:

              Aalborg Extreme™ (launched in autumn 2018)

              Aalborg Excel™ (launched in autumn 2019).

These ultra-high performance concrete (UHPC) solutions are ready to be used (just add water), shrinkage reduced and self- compacting. Aalborg Extreme is suitable for structural applications (eg, structural building elements, balconies, bridges), while Aalborg Excel is for decorative applications (eg, facade cladding, urban furniture).

Futurecem hits the runway

In accordance with Cementir’s customer- centric approach and representing a group strategic initiative, tailored product development projects have been launched across regions, aiming to examine market requirements in several applications prior to market launches.

Currently, the main focus is northern and western regions in Europe with two leading projects at Aalborg Portland in Denmark and CCB in Belgium.

At Aalborg , where futurecem takes its roots, the purpose of the project is to market the first grey cement based on futurecem.

The entire Cementir Group, with cross- functional/cross BU teams, is working together to reach the milestones in the roadmap that covers the full value chain from raw materials, through cement and concrete production and up to the final applications.

The first full-scale production trial was successfully performed in 2019, testing all parts of the manufacturing process. For further fine-tuning, from September 2019 to spring 2020 additional trial productions were successfully carried out. This phase ended with a great achievement – in March 2020, Bureau Veritas certified the first cement based on futurecem with the designation of CEM II/B-M(Q-LL) 52.5N, in accordance with European cement standard EN 197-1:2011.

In the same period, internal sampling/ testing within group company Unicon was carried out, focussing on ready-mixed applications and scanning all the most relevant features requested by standard and final customers. The aim was to extensively apply futurecem in the most commonly-used mixes and for the most relevant end-applications at job sites.

These full-scale trials have confirmed the full suitability for implementation in the concrete industry using conventional production and execution technologies with very minor adjustments.

Based on these results, lifecycle analyses have been performed,  documenting around 20 per cent CO2 reduction compared to conventional concrete and an estimated six per cent CO2 emissions reduction on standard building. This chain of CO2 emissions reduction is fully aligned with European cement association Cembureau’s 5C approach, covering cement, concrete and construction.

As a part of Cementir Group’s customer- centric approach, deliveries are planned in the 3Q20 to a select group of customers to carry out further testing on different materials and to extend the coverage of end-applications. During this testing, customers will be supported by a technical sales team as well as by research and quality centre experts. The experiences and lessons from the tests, along with other input from internal trials, will be considered for the further development of Futurecem.

A fundamental milestone is the inclusion of Futurecem cement into the Danish annex for European concrete standard DS/EN 206 DK. For this reason, Futurecem cement is undergoing a large testing programme at the Danish Technology Institute (DTI) to document its durability performances against aggressive agents. So far, results have been very promising.

The first cement based on futurecem technology is expected to be launched on the market by the end of 2020. According to the group and initial market expectations, cement based on futurecem will become the reference cement in Denmark, as market demand for greener solutions is continuously growing in all construction sectors, from building to infrastructure.

As far as the project at Cementir’s Belgian subsidiary CCB is concerned, in June 2019 the group started the assessment on futurecem’s feasibility in terms of production, sourcing and standards. This project is expected to be completed by mid-2021 and then the same roadmap applied at Aalborg will be followed.

From 2021 similar projects are scheduled to start in other plants, including white cement.

Moving forward

Innovation never stops at the Cementir Group, with plans for the continuous development of futurecem technology to address the challenges for a greener and more sustainable transition in the construction sector.

At its Aalborg-based research and quality centre the group has already been working on further developments. With this in mind, Cementir (as part of a consortium that covers relevant stakeholders from the entire value chain) has founded the Calliste project (CALcined clay LImeStone Technology Extension ) in Denmark. This project aims for further CO2 emissions reduction (with up to 50 per cent of clinker replacement) and extension in the applications.

The Cementir Group is also participating as a main player in an international initiative promoted by the Global Cement and Concrete Association (GCCA): Innovandi – the Global Cement and Concrete Research Network. Innovandi ties together the cement and concrete industry with scientific institutions to drive and support global innovation with actionable research. Calcined clay is considered a key strategic technology and Cementir Group is leading the way.