Displaying items by tag: Massachusetts Institute of Technology

US: Researchers at the Massachusetts Institute of Technology (MIT) have developed an AI tool to compare studies of alternative raw materials for cement production. A collaborative team from the MIT Concrete Sustainability Hub and MIT’s recycling research programme, Olivetti Group, published its findings in the Nature journal. The team mined 5.7m academic publications to identify 14,434 alternative raw materials. These belonged to 19 ‘types,’ including bottom ashes, fly ashes, calcined clays and slags, as well as less homogenous types such as biomass ashes, glasses and mine tailings. The study more than doubles the number of fly ashes and slags recorded on a database of this kind. The tool then provides a unified assessment of cementitious reactivity and pozzolanicity, also accounting for variables in particle size and amorphous content.

US: A team from the Massachusetts Institute of Technology (MIT) has developed a new method to sequester CO₂ in concrete before curing it. The method is based on the addition of bicarbonate of soda, which reacts with cement to produce a calcium carbonate-calcium silicone hydrate composite. The Journal of Engineering has reported that the method adds the benefits of CO₂ mineralisation during production and casting, doubling the mechanical performance of early-stage concrete. It also eliminates the effects of carbonation reactions in cured concrete, which weaken the concrete by lowering its alkalinity, which accelerates the corrosion of rebar. The method has the potential to sequester 15% of CO₂ emissions from cement production.

The team said “The pre-curing capacity of concrete to sequester CO₂ has been largely underestimated and underutilised. Our new discovery could further be combined with other recent innovations in the development of lower carbon footprint concrete admixtures to provide much greener, and even carbon-negative, construction materials.”

US: Sublime Systems says it has secured US$40m in funding from its latest investment round. Venture capital company Lowercarbon Capital, The Engine, Energy Impact Partners and others took part in the Series A funding round. Siam Cement Group has also been announced as a strategic investor. The company will use the new capital to increase production at its pilot plant, build its team, conduct product testing and promote offtake commitments from new customers and partners.

Sublime Systems is commercialising an electrolysis cement production process that will manufacture cement at ambient temperature from a variety of abundant calcium sources. It says it is the first company to produce cement through this process.

Leah Ellis, co-founder and chief executive officer of Sublime said, "We have successfully demonstrated the viability and scalability of our approach and we are able to produce cement with the same or better strength, slump and durability than today's Portland cement. The support of our talented team and capital from our investors will enable us to operate our pilot facility, secure advance offtake agreements and work toward producing our low-carbon cement at scale."

The company was spun-out of the Massachusetts Institute of Technology (MIT) in 2020. It was co-founded by Yet-Ming Chiang, an MIT professor and co-founder of several climate-tech companies, including A123 Systems, 24M Technologies and Form Energy, and Leah Ellis, an Activate Fellow and one of MIT Technology Review's 35 Innovators under 35. To date, the company has concentrated its efforts on developing its first drop-in, low-carbon cement product, validating its manufacturing process at the pilot scale, validating buyer demand and building up its team.

US: Switzerland-based LafargeHolcim has become a founder member of the MIT Climate and Sustainability Consortium with the Massachusetts Institute of Technology (MIT). The group says that the consortium aims to accelerate climate action through innovation. It says that it will represent the building materials industry in working with MIT’s research team to develop ‘scalable solutions’ to tackle climate change. It joins 12 other companies, including Apple, Boeing and IBM.

Chief executive officer Jan Jenisch said, “I am committed to building a net zero future, driving innovative and sustainable building solutions that work for people and the planet. With the urgency of today’s climate crisis, no single organisation can tackle it alone. That’s why I am proud to be joining MIT’s alliance of like-minded industry leaders and academic partners to scale up our climate action together.”

US: A team of researchers at the Massachusetts Institute of Technology (MIT) have demonstrated an electrochemical process to make clinker in a laboratory. A paper on the work by Yet-Ming Chiang, the Kyocera Professor of Materials Science and Engineering at MIT, with postdoctoral researcher Leah Ellis, graduate student Andres Badel and others has been published in the Proceedings of the National Academy of Sciences of the United States of America (PNAS).

In the new process, pulverised limestone is dissolved in acid at one electrode in an electrolyser and carbon dioxide (CO₂) is released in a pure, concentrated stream. Lime is precipitated out as a solid at the other electrode. The lime can then be processed in another step to produce clinker.

Benefits of the new process include potentially substituting fossil fuels with electricity supplied from renewable sources and the production of a pure source of CO₂ that could be captured with less or no scrubbing compared to conventional clinker production.