• Prof. Surendra P Shah
• Prof. Ruben Snellings
• Prof. Gaurav Sant
• Prof. Chi-sun Poon
• Prof. Tung-Chai Ling
• Prof. Alejandro Fernandez-Martinez
• Dr. Maciej Zając

 

Prof. Surendra P Shah

Contents of the lecture:
Carbon Conscious Concrete and Global Warming Potential

Concrete is the most widely used construction material in the world by mass, and its demand is expected to continue increasing in response to rapid urbanization. Compared to other materias such as steel and polymers, concrete has considrably lower GWP. But we use a large amount of concrete .Multiple attemts are being made to reduce GWP of concrete.Approaches using multifunctional aditives are prsented here. CO2 utilization in construction materials offers a multifaceted strategy for reducing the carbon footprint of the construction industry. Further technological advancements in this area can contribute significantly to mitigating climate change. By incorporating CO2 into construction materials through mineral carbonation techniques such as accelerated CO2 curing, carbonation treatment of by-products and recycled aggregates, and CO2 injection into freshly mixed concrete or mixing water, the construction industry can substantially reduce its carbon footprint. In parallel, the incorporation of nanomaterials has been shown to enhance CO2 uptake while improving the interfacial properties between aggregates and the cementitious matrix, which is essential for improving mechanical performance. In addition, the ability to control carbonate polymorph formation during CO2 mineralization will be discussed. Overall, the presentation provides insight into emerging solutions currently being explored in the field of concrete science to reduce the carbon footprint of construction materials.

 

 

Prof. Ruben Snellings Ruben Snellings is an associate research professor at KU Leuven, Belgium. He earned a PhD in geology at KU Leuven on the pozzolanic reactivity of natural zeolites. After his PhD, he was a postdoctoral researcher at UGent (Belgium) and a Marie Curie Fellow at EPFL (Switzerland), specialising in Xray diffraction and electron microscopy of supplementary cementitious materials. He then worked eight years at VITO as senior researcher before returning to KU Leuven. In 2016 he received the RILEM Gustavo Colonnetti Medal. He currently leads the Applied Mineralogy group at KU Leuven, focusing on sustainable and innovative construction materials using primary and secondary resources as well as mineral carbonation technologies.

Contents of the lecture:
Mineral carbonation hardening – niche or mainstream?

Mineral carbonation is an innovative and rapidly developing field that is expanding into various construction material application domains. The conversion of CO₂ into solid, stable mineral carbonates is considered to be a promising and potentially viable way to reduce, store and use carbon emissions. Mineral carbonation usually is a slow process, yet can be accelerated in various ways and applied to a wide range of precursors. This has led to a multitude of processes (wet, moist, dry, supercritical,…) and applications under investigation, development and implementation.

In this lecture, recent advances in mineral carbonation hardening processes and products are reviewed. While industry firsts are appearing across continents, carbonation hardening is a complex process that is often only phenomenologically understood based on empirical experimentation. Recent advances and remaining knowledge gaps in quantitative understanding of carbonation hardening will be discussed.   Opportunities and challenges in product development and process upscaling will be discussed based on actual examples, stressing the importance of flanking regulation to support further economic development from niche to mainstream production.

On a more general note, it will be stressed that the expanding field of mineral carbonation requires sharing experiences, understanding and best practices to build a common knowledge base and bring mineral carbonation products from the lab to the market. In conjunction, we highlight the activities of RILEM TC 309-MCP as regards establishing terminology and material characterisation methods while exchanging and reporting on state-of-the-art mineral carbonation processes and products.

 

 

Prof. Gaurav Sant Pritzker Professor of Sustainability, and Founding Director: Institute for　Carbon Management, UCLA, and CTO, Equatic Inc. Biography: Gaurav is a Professor and the Pritzker Endowed Chair in Sustainability at the Samueli School of Engineering at the University of California, Los Angeles (UCLA).　He has published over 225 peer-reviewed journal publications and has an h-index of 68. He is the Director of UCLA's Institute for Carbon Management (ICM): a cross-campus technology translation institute. He is the CTO/Co-Founder of Equatic Inc., the Grand Prize Winner of the Temasek Foundation’s 2021 Liveability Challenge, the Co-Founder of Concrete-AI Inc., the Co-Founder of Nextli Technologies Inc., and the Founder of CarbonBuilt Inc., a Grand Prize Winner of the 2021 NRG COSIA Carbon XPRIZE. He has served as an expert providing: a) testimony to the U.S. Senate, U.S. House of Representatives, and the California State Senate, and b) strategic consulting, core R&D, and innovation support to Fortune500 corporations, government agencies, foundations, and industry organizations globally. He earned his B.S. (2006), M.S. (2007), and Ph.D. (2009) from Purdue University. He is a Fellow of the American Concrete Institute, the American Ceramic Society, and the U.S. National Academy of Inventors (NAI).

Content of the lecture:

Ambient carbonation—the passive uptake of atmospheric carbon dioxide (CO₂) into the alkaline pore solution of concrete—has been proposed to mitigate CO2 emissions from cement production. Herein, we apply thermodynamic and diffusion-based analyses within a Monte Carlo framework to evaluate the extent and rate of ambient carbonation across concrete formulations and geometries (i.e., described by their surface-to-volume ratio, 0.01 ≤ s/v ≤ 80, m-1), globally. The analysis indicates that, by 2030, the carbonation of concrete placed in service, globally, under ambient conditions, is projected to uptake ~0.23 GtCO₂ annually (i.e., <10% of annual cement clinker emissions). Thus, the amount of CO₂ sequestered by ambient carbonation is negligible compared to the quantities emitted during cement production. Importantly, this analysis underscores the importance of prioritizing the net present value (NPV) of industrial decarbonization and of advancing intentional climate change mitigation solutions that deliver meaningful and timely reductions in anthropogenic CO2 emissions.

 

 

Prof. Hegoi Manzano Physics Department, Facultad de Ciencia y Tecnología, Universidad del País Vasco UPV/EHU, Barrio Sarriena s/n, 48940 Leioa (Spain) Hegoi Manzano obtained his PhD in Physical Chemistry from the University of the Basque Country (UPV/EHU) in 2010, after completing an industrial PhD at TECNALIA, a research and development organization. His doctoral thesis focused on the atomistic modelling of cement-related materials. He subsequently joined the Massachusetts Institute of Technology (MIT) as a postdoctoral researcher for two years, where he worked on the development of reactive force fields and their application to cementitious materials. In 2012 he returned to the UPV/EHU, where he held several postdoctoral positions until 2015, including a Juan de la Cierva fellowship. In that year he obtained a position as Assistant Professor in the Department of Physics at the Faculty of Science and Technology, UPV/EHU, where he is currently a Permanent Professor. At UPV/EHU, Hegoi Manzano leads a research group dedicated to atomic and mesoscale modelling of cement-related materials, an area in which the group has become an international reference. He has published more than 100 articles accumulating more than 6,300 citations, with an h-index of 40. He is a member of the Transnational Laboratory “Aquitaine–Euskadi Network in Green Concrete and Cement-based Materials” (LTC-Green Concrete) and of the RILEM association, and since 2021 he has served as editor of the journal Cement and Concrete Research. He has supervised 30 Bachelor’s theses, 5 Master’s theses, and 7 PhD dissertations. He is currently a member of the Faculty Board of the Faculty of Science and Technology and a member of the UPV/EHU Degree Studies Committee.

Content of the lecture:

Atomic-scale insights into nucleation pathways of calcium carbonate in cementitious environments 

   The mineralization of CO2 into calcium carbonate has emerged as a promising pathway to reduce or sequester carbon emissions in cement-based materials. However, despite the apparent chemical simplicity of the Ca – CO3 system, the mechanisms controlling nucleation, growth, and polymorph selection remain difficult to predict. The problem becomes even more complex in realistic cementitious environments, where foreign ions such as magnesium, silicates, and aluminates may strongly modulate nucleation pathways and stabilize intermediate structures. 
  A central challenge is that the interactions governing carbonate formation are highly sensitive to atomic-scale structure, hydration, and ion pairing. At the same time, the relevant processes often occur over timescales that remain far beyond the reach of direct atomistic simulation. As a consequence, obtaining a complete description of carbonate nucleation is extremely difficult.
  In this context, we approach the problem by developing complementary computational strategies that can be viewed as pieces of a broader puzzle. Each method captures a different aspect of the nucleation process, and together they help build a more coherent picture of carbonate formation in complex chemical environments.
  First, I will present our work on identifying the structures of prenucleation clusters and primary particles using evolutionary algorithms. These approaches allow us to explore the configurational landscape of small Ca–CO3 particles and to identify energetically favorable motifs that may act as precursors during nucleation.
  Second, I will discuss our efforts to understand the formation of amorphous calcium carbonates. In this case we are building models to explore the thermodynamics of amorphous phases, investigating their stability and their structural relationship with crystalline polymorphs.
  Finally, I will present simulations aimed at understanding dehydration processes in highly concentrated ionic environments, which may represent a key step in the transformation from solvated ionic assemblies into amorphous carbonate phases. Taken together, these approaches contribute complementary pieces of information toward a broader objective, understanding how atomic-scale interactions and solution chemistry control carbonate nucleation and polymorphism, and ultimately how these processes may be manipulated in cementitious systems to enhance CO₂ mineralization.