Displaying items by tag: Sustainability
Global: The Global Cement and Concrete Association (GCCA) has received nearly 100 applications from worldwide tech start-ups for its Innovandi Open Challenge, which targets the decarbonisation of cement and concrete. This year's challenge is centred on carbon capture, utilisation and storage (CCUS) technologies.
Thomas Guillot, GCCA’s Chief Executive, said "There are already more than 100 CCUS cement industry pilots, projects and announcements in the pipeline across the world – with the world’s first commercial scale carbon capture and storage plant set to complete later this year. Innovation will help our industry to deploy this technology further and faster."
Claude Loréa, GCCA’s Cement, Innovation and ESG Director, said "It’s really encouraging to see nearly 100 applications for our Innovandi Open Challenge and from all parts of the world. As well as the US, UK and India, we’ve received applications from China, Greece and Australia for the first time. It demonstrates the high level of interest in working with our industry to make cement and concrete net zero. We’re looking forward to assessing all the applications, in detail."
The association, alongside over 50 experts from member companies, will now review and shortlist the most deployable technologies, offering shortlisted start-ups access to key industry resources and networks.
Colombia: Cementos Argos and Sistema Verde have collaborated to transform nearly 27t of waste from the Estéreo Picnic music festival in Bogotá on 21 – 24 March 2024 into alternative fuel for Cementos Argos' Cartagena plant. The initiative, which includes converting materials such as plastics and cardboard into fuel, aligns with Cementos Argos’ aim to reduce fossil fuel use and CO₂ emissions per tonne of cement by 29% by 2030.
Mauricio Giraldo, director of alternative resources at Cementos Argos said "We are very pleased to be part of this alliance with which we join the global need to join efforts to make an adequate use of waste in a safe, controlled and clean manner. Our goal as a company is to dispose of more than 300,000t/yr of waste, and with actions like this, we continue to contribute to achieving this goal.”
Philippines: Holcim Philippines will invest US$35m in sustainability initiatives at its four plants over the next three years. The investments will also include US$17.5m for its waste management arm, Geocycle, increasing capacity for local government unit waste processing.
Chief sustainability officer Samuel Manlosa Jr. said "There is also a side where, if we want to take in more volume, we need to increase our capacity to shred and prepare the materials. Our cement plants, even as sophisticated and technologically advanced as they are, were constructed 20 years ago when norms were different, so we had to make changes in the process to make sure that the plants were able to accept more."
The company will further invest between US$8.7m and US$17.5m in renewable energy and electrification of its vehicle fleet. President and CEO Horia Adrian said "We are purchasing electricity right now, but we have plans to put in place solar facilities and we are looking at the possibility of using electricity generated from biowaste here. By the end of 2024, some of them should be ready."
He concluded that investments at the Bulacan and La Union plants are set to start this year, with those in Davao and Lugait scheduled for 2025.
Fortera opens new ‘green’ cement plant in California
15 April 2024US: Fortera has inaugurated its first ‘green’ cement production facility in North America, located in Redding, California. The 2787m2 ReCarb plant operates alongside the existing CalPortland cement plant, capturing CO₂ emissions and mineralising the CO₂ into calcium carbonate for production of the company’s low-carbon ReAct cement. The process reportedly reduces emissions by 70% compared to traditional methods, yielding a tonne of ‘green’ cement for every tonne of limestone input. The facility aims to capture 6600t/yr of CO₂ and to produce 15,000t/yr of ‘green’ cement.
According to Fortera CEO Ryan Gilliam, Fortera currently has 20 upcoming projects with various cement producers, which will cost US$150m each. This includes a plant in the Midwest that will be a 25-fold capacity increase compared to the Redding plant, producing 400,000t/yr of ‘green’ cement.
Thailand: Biochar Life and Siam Cement Group (SCG) have signed a Memorandum of Understanding to jointly develop biochar-infused cement and sustainable building materials. This collaboration aims to utilise biochar in the construction industry and reduce carbon emissions.
The partnership will begin with a pilot project at Chiang Mai University, focusing on constructing biochar-infused cement roads. Biochar Life will evaluate the scalability of biochar production to meet SCG's material requirements. Both companies will engage in research and development to optimise the production and application of biochar in construction, considering environmental benefits and carbon removal credit opportunities.
SCG also plans to extend Biochar Life’s smallholder farmer program, incorporating mobile industrial units and other technologies. This joint effort is directed towards incorporating carbon-negative biochar into building materials. This will lower construction-related carbon emissions, aid in atmospheric carbon sequestration, and improve the durability and performance of these materials.
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."
Philippines: A recent study from Cebu, Philippines presents a method for reducing greenhouse emissions in the cement industry. The research, supported by the Department of Science & Technology (DOST) of the Philippines, focuses on partially substituting cement with coal fly ash (CFA). According to the University of San Carlos researchers, CFA's efficacy as a cement substitute depends on its source, with variations in quality, performance, and water requirements when used in paste and mortar formulations.
The study evaluated CFA from a Philippine power plant, examining its use as a partial cement substitute. Researchers designed paste and mortar mixtures with different CFA-to-binder ratios and water-to-binder ratios. The study revealed that increasing the amount of CFA in cement up to 20% by weight could enhance compressive strength, ‘outperforming’ pure cement mixtures.
The study concluded that substituting a portion of cement with CFA not only reduces greenhouse gas emissions but also improves the compressive strength of the resultant material.
SCG launches low-carbon cement in Thailand
03 April 2024Thailand: Siam Cement Group (SCG) has introduced a new low-carbon cement, contributing to Thailand's net-zero ambitions. According to the company, SCG is Thailand's first cement manufacturer to produce this eco-friendly cement, reducing CO₂ emissions to as low as 0.05t during production. The new cement reportedly matches or is stronger than traditional Portland cement. SCG achieved this by improving its manufacturing processes, using clean energy sources and waste heat utilisation, leading to a 38% decrease in energy consumption. The company also modified raw material ratios in order to further reduce emissions.
SCG's president of the cement and green solutions department, Surachai Nimlaor, said “Since cement production consumes a considerable amount of energy and emits CO₂ during the process, we decided to find out how we could reduce this impact." He continued “With the initial low-carbon cement formula, we have reduced emissions by 15 to 20%. Moving forward, our goal is to develop new formulas that can reduce carbon emissions by up to 50%.”
Brazil: Votorantim Cimentos has made progress in reducing its carbon footprint, reporting embodied CO₂ emissions of 556kg/t of cement produced in 2023, a 4% year-on-year decrease. The company aims to reach a target of 475kg of CO₂/t by 2030, aligning with the Science Based Target initiative standards.
The company's decarbonisation strategy involves four stages: co-processing, which involves substituting fossil fuel with biomass and waste; use of cementitious materials to replace clinker; enhancing energy efficiency and use of renewable energy; and developing new technologies and materials, including carbon capture. In 2023, Votorantim Cimentos achieved a 31% global thermal substitution rate through co-processing, an increase from 26.5% in 2022, with a goal of reaching 53% by 2030. The clinker factor was reduced to 72.8% in 2023 from 73.9% in 2022. This reduction means a decrease in emissions, with a target clinker factor of 68% set for 2030. Additionally, 35.1% of the electricity consumed by Votorantim Cimentos in 2023 came from renewable sources, an increase from 22.9% in 2022, with an aim of 45% by 2030.
Álvaro Lorenz, global director of sustainability, institutional relations, product development, engineering, and energy at Votorantim Cimentos, said "The most competitive and sustainable companies will be those with the lowest emissions. In all countries where we operate, we are committed to advancing in our decarbonisation journey, in line with our goal of producing carbon-neutral concrete by 2050."
Votorantim Cimentos’ environmental efforts were recognised with an A score by CDP and a Top-Rated Industry company distinction by Sustainalytics in the Latin American building materials sector. The company also announced a US$989m investment to further reduce its CO₂ emissions. This includes a project at Salto de Pirapora to increase thermal substitution, with expected completion by 2028. Votorantim Cimentos has also started constructing a solar energy complex in Paracatu, with an estimated capacity of 470MWp.
US: A research team from Lehigh University has won a three-year, US$2m grant from the Department of Energy's industrial efficiency and decarbonisation office for a project on concrete decarbonisation. The team, including Carlos Romero, director of Lehigh's Energy Research Centre, aims to develop a sustainable concrete binder using calcined clay, reducing emissions associated with Ordinary Portland Cement production. The project collaborates with Buzzi Unicem USA and focuses on processing and testing calcined clay to mimic the properties of conventional cement.
Lehigh's team will explore various low-grade calcined clays, supplied by Buzzi, testing their compressive strength and durability. The goal is to halve the CO₂ emissions of traditional concrete mixes.
Chair of the Department of Civil and Environmental Engineering Shamim Pakzad said "I am excited about the expansion of the research portfolio of CEE departments into this area of greener cement, which opens many opportunities for future research and implementation in industry."