Browsing by Author "González, Marcelo"

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    Assessing the Technical Suitability of Precipitated Materials from the Electrochemical Decarbonation of Limestones for Cement and Hydrated Lime Production: A Reproducibility Study Performed in Canada and Chile
    (2025) Ramirez Amaya, Dario Alonso; Mahmood, Osamah; Noël, Martin; Kavgic, Miroslava; Martinez, Natalia P.; Troncoso P., Felipe; Gazzano, Valeria; Dreyse, Paulina; Canales Muñoz, Roberto; González, Marcelo
    Concrete is essential for most civil engineering applications, but its use faces pressing challenges to reduce CO2 emissions. These emissions are linked principally to the chains of cement production that calcinate limestones (CaCO3 → CaO þ CO2) for quicklime, hydrated lime, and clinker production. Electrochemical decarbonation is a novel technology with the potential to introduce synergistic strategies to mitigate CO2 emissions from this chemical reaction. However, its early incorporation in the current chains of cement and lime production requires evidence of the quality of materials produced by this technique under the broad conditions of the cement and lime industries worldwide. In this reproducibility study performed in Canada and Chile, multiple sources of limestone feedstock used for lime and cement production were subjected to an electrochemical decarbonation process to precipitate low-CO2 intermediary feedstock materials. The potential of the precipitate materials (PMs) as an intermediary for cement manufacturing and as a final hydrated lime product was assessed by contrasting the lime saturation factor, lime concentration, content of secondary oxides (MgO, K2O, and Na2O), and content of CO2 with those of theirprecursor limestones and the requirements established by the state of practice of these industries. Results showed that regardless of their origin, the obtained PMs mainly comprised calcium hydroxide [CaðOHÞ2 > 78.8% by mass], with increased lime concentration (CaO > 65.39%) and decreased other primary oxides (SiO2, Al2O3, and Fe2O3 < 1%) and carbon dioxide content (CO2 < 9.42% by mass). Several PMs had suitable chemical and physical characteristics to be considered directly for clinker and lime manufacturing, which is critical to the scalability of the electrochemical decarbonation process.
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    Developing a very high-strength low-CO2 cementitious matrix based on a multi-binder approach for structural lightweight aggregate concrete
    (2020) Mena, J.; González, Marcelo; Remesar Lera, José Carlos; López Casanova, Mauricio Alejandro; CEDEUS (Chile)
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    Pro-angiogenic Role of Insulin: From Physiology to Pathology
    (2017) Escudero, Carlos A.; Herlitz, Kurt; Troncoso, Felipe; Guevara, Katherine; Acurio, Jesenia; Godoy Sánchez, Alejandro Samuel; Aguayo, Claudio; González, Marcelo
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    Reduction of Blood Amyloid-beta Oligomers in Alzheimer's Disease Transgenic Mice by c-Abl Kinase Inhibition
    (2016) Estrada, Lisbell D.; Chamorro Veloso, David Daniel; Yáñez, María José; González, Marcelo; Leal, Nancy; Bernhardi Montgomery, Rommy von; Dulcey, Andrés E.; Marugan, Juan; Ferrer, Marc; Soto, Claudio; Zanlungo Matsuhiro, Silvana; Inestrosa Cantín, Nibaldo; Álvarez Rojas, Alejandra
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    Sustainable Cement Paste Development Using Wheat Straw Ash and Silica Fume Replacement Model
    (Multidisciplinary Digital Publishing Institute (MDPI), 2024) Bastías, Bryan; González, Marcelo; Rey-Rey, Juan; Valerio, Guillermo; Guindos, Pablo
    © 2024 by the authors.Conventional cement production is a major source of carbon dioxide emissions, which creates a significant environmental challenge. This research addresses the problem of how to reduce the carbon footprint of cement paste production using agricultural and industrial waste by-products, namely wheat straw ash (WSA) and silica fume (SF). Currently, accurate models that can predict the mechanical properties of cement pastes incorporating these waste materials are lacking. To fill this gap, our study proposes a model based on response surface methodology and Box-Behnken design, designed to predict the strength of cement pastes with partial substitutions of WSA and SF. Through mechanical and characterization tests, the model demonstrated high accuracy in predicting the strength of the pastes, validated with three mixes, which showed maximum errors of less than 6% at different ages (7, 28, and 56 days). Response surface analysis revealed that replacing cement with 0–20% WSA and more than 5% SF can effectively reduce the carbon footprint by maximizing waste incorporation. This model allows for the calculation of optimal cement substitution levels based on the required strength, thus promoting sustainability in the construction industry through the use of local waste/resources.