Displaying items by tag: Research

US: Researchers from CalPortland have published a peer-reviewed study looking at the absorption or carbonation of CO₂ by buildings, pavements and structures made from concrete. The authors argue that this negative effect on CO₂ emissions is not being considered in global, national and regional greenhouse gas accounting methods. The paper calls for focused studies on CO₂ uptake in concrete within the context of its overall Life Cycle Assessment (LCA).

“It is time to further examine the value of concrete in the built environment as a significant carbon sink,” said Allen Hamblen, president and chief executive officer (CEO) of CalPortland. “To do so accurately, we must specifically look at the net effects of CO₂ sequestration in concrete and evaluate all structures over their lifetime within a circular economy.”

The study looks at previous attempts to quantify the effect of concrete carbonation, notably using work by the Swedish Environmental Research Institute (SERI) that examined data from several European countries to develop practical models to gauge the extent of CO₂ uptake by concrete globally in the built environment. Different models estimated that 15 - 20% of CO₂ emissions from clinker production were reabsorbed over the lifetime of concrete structures.

China: Researchers from the Xinjiang Communications Construction Group have developed a new type of cement-based concrete that uses soil as well as wind-blown sand. The new concrete also uses construction waste and steel slag, according to the Xinhua News Agency. It is intended to lower construction costs and times with applications in infrastructure projects.

US: Illinois State University has been awarded a US$15,000 grant by the Environmental Protection Agency (EPA) to research the use of recycled glass as a substitute for Ordinary Portland Cement and fly ash in controlled low-strength material (CLSM). CLSM, also called flowable fill, is a cement-based construction material commonly used for backfilling trenches or other excavations, as well as soil-stabilisation. It can be produced at any ready-mix concrete plant by mixing cement, fly ash, sand and water in the correct proportions.

Project lead Pranshoo Solanki said that preliminary results are promising, and show that required flow and strength can be met by replacing cement and fly ash with recycled glass powder.

The EPA grant is for phase one of the recycled glass project for research at the laboratory scale. Funding for phase two will then be sought to test the product in real-world trials.

China: Germany’s Wacker Group has opened a new competence centre for cement and concrete applications in Shanghai. The laboratory will develop silicone based products and solutions which are able to improve the performance of cement and concrete and to make these materials more sustainable. Special focus is on silicone admixtures and performance enhancers.

“As a regional innovation platform focusing on cement and concrete, the new lab will cooperate with leading Chinese universities, research institutions and the industry. Its goal is to develop innovative products and solutions which support the sustainable development of the Chinese construction materials industry,” said Paul Lindblad, president of Wacker Greater China.

At its new competence centre in Shanghai, Wacker will be able to investigate how silicone chemistry can protect cement and concrete against environmental influences and, at the same time, improve the durability of these materials.

Portugal: Researchers at the Department of Materials Engineering and Ceramics at the University of Aveiro have developed a so-called ‘eco-cement’ that uses waste cellulose and clay. The cement type uses waste from the pulp industry such as ash and lime grains. This makes up 70% of its composition with the remaining 30% being metakaolin clay. The cement can be manufactured at room temperature reducing its energy consumption massively compared to Ordinary Portland Cement. The research team includes Manfredi Saeli, Rui Novais, Paula Seabra and João Labrincha.

UK: A consortium comprising Aggregate Industries, Innovatium and the University of Birmingham has gained funding from the Department for Business, Energy and Industrial Strategy (BEIS) to test a liquid air energy storage (LAES) energy efficiency technology under the government’s Industrial Energy Efficiency Accelerator (IEEA) programme. The IEEA programme, administered by the Carbon Trust on behalf of BEIS, will provide nearly Euro0.4m towards delivering a new compressed air system utilising LAES technology from initial laboratory testing to full operation at Aggregate Industries’ Bardon Hill quarry in Leicestershire.

PRISMA (Peak Reduction by Integrated Storage and Management of Air) by Innovatium is a LAES technology that stores energy in liquid air form to provide compressed air, allowing inefficient partially loaded, variable-demand compressors to be turned off, thus improving the total system efficiency by up to 57%. The PRISMA system will bring together a latent energy cold storage tank, filled with a phase change material (PCM) to store thermal energy, and a number of other off-the-shelf components to form a system that will work with Aggregate Industries’ existing compressed air network. The research group says that the integration of the equipment and components in an industrial setting, for the provision of compressed air, has never been attempted before.

“The project will help to address the ‘energy trilemma’ of managing energy efficiency, energy cost and energy security by: significantly improving the energy efficiency of our compressed air system; managing electricity costs by running the compressors out-of-hours, when electricity is cheaper; and helping to smooth and reduce the peak electrical demand on site. We are therefore very excited to be the first industrial partner to install the PRISMA system at our Bardon Hill quarry in Leicestershire,” said Richard Eaton, Energy Manager at Aggregate Industries.

The 24-month project will involve the development of the PCM at the University of Birmingham’s School of Chemical Engineering as well as the design, manufacture and assembly of multiple system components by Innovatium before installation of the system at Bardon Hill. The PRISMA Project has currently only been deployed in a simulated environment. Following successful delivery of the project, this scalable technology has multi-sectoral applications for compressed air systems both in the UK and globally. In the UK, the compressed air market is estimated at 1.3GW of installed electrical capacity across around 4500 sites and over 55,000 individual compressor units.

Sweden: HeidelbergCement’s subsidiary Cementa has completed a feasibility study into electrifying its cement plant at Slite in Gotland as part of its Cemzero project. A report from the first phase of the project has been submitted to the Swedish Energy Agency.

The study found that using electricity to supply heat during the clinker production process is possible using plasma technology, although this needs to be tested on a larger scale. Using an electrified process was found to be competitive compared to other options for achieving high reductions in carbon emission. The production cost of cement would be doubled approximately but the research suggested that this might only mean a small percentage increase to the end cost of a building or an infrastructure project. Finally, the study reported that any future electrification of the Slite plant would work well with a planned expansion to wind turbine generation at the site. It would improve the energy balance and reduce the maximum power surplus that might occur.

Cementa and energy company Vatenfall will now look at how to build a pilot plant.

France: The SOLPART (Solar-Heated Reactors for Industrials Production of Reactive Particulates) project plans to test a pilot-scale version of its solar reactor from February 2019. The 50kW solar reactor will test a fluidised bed system at its PROMES (PROcédés, Materials and Solar Energy) testing site in Odeillo. The ultimate goal of the project is to test using a rotary kiln and a fluidised bed system to produce cement, lime, gypsum and other non-metallic products using only solar energy. The pilot scale reactor will test calcining limestone at a rate of 50kg/hr. Industrial partners involved with the project include Cemex.

Research from the Global Carbon Budget (GCB) this week forecasts that fossil CO₂ emissions from the Indian cement industry will rise by 13.4% in 2018. This is in stark contrast to the smooth mood music from the Cement Sustainability Initiative (CSI) last week, which stated that the local industry was on track to meet its commitments towards decarbonisation. So what’s going on?

The situation is akin to the fable about the blind men and the elephant. Both the GCB and the CSI are approaching the emissions of the Indian cement industry from different directions. The GCB is using available data (including data from the CSI) to try and estimate what the CO₂ emissions are. It takes cement production data using a method adapted from a paper published by Robbie M Andrew of Norway’s CICERO Center for International Climate Research in 2018 and then it takes into account the types of cement being produced and the clinker factor. This is then converted into an estimated clinker production figure and this is then converted into a CO₂ figure.

However, the CSI meanwhile actually has direct data from its local members. At the moment these include ACC, Ambuja Cements, CRH, Dalmia Cement (Bharat), HeidelbergCement, Orient Cement, Shree Cement, UltraTech and Votorantim Cimentos. As part of the Getting the Numbers Right (GNR) database it collects production and sustainability related data from its members. However, for reasons of competition, it maintains a year gap before it reports its data. This means that the GCB can report its estimate ahead of the CSI data.

There is nothing to stop the CSI reporting its progress against its targets though. And this is exactly what it has done in India with the recent document outlining progress towards the 2030 targets from the low carbon technology roadmap (LCTR). The headline CSI metric was direct CO₂ emission intensity. According to the CSI, this has fallen by 32kgCO₂/t cement to 588kgCO₂/t cement in 2017 mainly due to an increased uptake of alternative fuel and blended cement production, as well as a reduction in the clinker factor. This is bang on target with its aim of hitting 320kgCO₂/t in 2050 (around 560 kgCO₂/t in 2020, assuming a linear decrease).

The problem is that cement production growth in India suddenly sped up in 2018. Global Cement estimates that India’s cement production is set to rise by 7% year-on-year to 296Mt in 2018 from 280Mt in 2017. Data from the Ministry of Commerce & Industry shows that cement production rose by nearly 16% year-on-year to 244Mt in the first nine months of 2018 from 211Mt in the same period in 2017. Along these lines the Cement Manufacturers Association of India has forecast growth of 10% in the 2019 financial year to the end of March 2019. It reckons that this is the fastest growth in the sector since the industry slowed down in 2011.

India’s per capita cement consumption is low (222kg/capita) and its urban population is also low (around 30%). That’s a lot of cement that’s going to be used as it shifts to developed global rates and already it’s the globe’s second biggest cement market. The CSI was right to get in there eight years ago. Yet, the question now is can CO₂ emissions decrease whilst the market grows? Research in the US suggests that the real reason for emission drops in the 2010s was the economic recession, not policy shifts or changes in the energy mix. If that holds in India then the cement industry will have a hard time reducing its carbon footprint irrespective of the work the CSI has done.

Australia: Research by the Global Carbon Budget (GCB) forecasts that CO₂ emissions will grow by 2.7% year-on-year to a 37.1 ± 2 Gt CO₂ in 2018. This follows a rise of 1.6% to 36.2Gt after a three-year hiatus with stable global emissions. The 2018 forecast is based on preliminary data for the first 6 – 9 months indicate a renewed growth in fossil CO₂ emissions based on national emission projections for China, the US, the European Union (EU) and India and projections of gross domestic product corrected for recent changes in the carbon intensity of the economy for the rest of the world.

In 2017 the GCB estimates that cement sector constituted 4% of global fossil CO₂ emissions, a rise of 1.2% from 2016. Emissions are expected to grow by 4% in China in 2018, in part due to a 1% rise in cement production. In the EU emissions are projected to fall by 0.7% with stable cement sector emissions. In India emissions are forecast to increase by 6.3% with a 13.4% rise in cement sector emissions.

Fossil CO₂ emissions are based on energy statistics and cement production data. The research makes its estimate of emissions from the cement industry using a method adapted from a paper published by Robbie M Andrew of Norway’s CICERO Center for International Climate Research in 2017.