A. Fernández‐Jiménez

CaCl2-driven phase instability in low-carbon calcium sulfoaluminate binders

Pilar Padilla-Encinas, Luís Urbano Durlo Tambara Júnior, A. Fernández‐Jiménez

This work studies the effect of CaCl 2 , at 5 wt.% and 20 wt.%, on the hydration of a commercial calcium sulfoaluminate clinker (KCSA) and cement (CSA). For this purpose, CSA and KCSA pastes were prepared with CaCl 2 substitution and …

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Mechanisms of early hydration of calcium sulfoaluminate cement in aqueous and alkaline media

Luís Urbano Durlo Tambara Júnior, Janaíde Cavalcante Rocha, A. Fernández‐Jiménez

The early hydration of calcium sulfoaluminate (CSA) cement in water (CSAH) and in 2 M sodium hydroxide (CSA2M), both with a liquid/solids ratio of 0.5, was investigated. Hydration kinetics were assessed using in situ X-ray diffraction, isothermal conduction calorimetry, ultrasonic pulse velocity …

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Avoiding calcination: Low-carbon alkali-activated binders from mechanochemically activated illitic, carbonate-rich clays

Marina Clausi, A. Fernández‐Jiménez, Gianluca Girardi, Vera Amicarelli et autres

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Calcium or Sodium Carbonate Influence on Calcium Sulfoaluminate Clinker Hydration

Pilar Padilla-Encinas, A. Fernández‐Jiménez

This work shows how the presence of calcium carbonate and sodium carbonate (5% and 20%) affects the hydration of a commercial calcium sulfoaluminate clinker (KCSA). For this study, water-hydrated pastes were prepared and the mechanical compressive strength and hydration rate were determined. …

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Comunicación y colaboración en línea y su impacto en el aprendizaje universitario

A. Fernández‐Jiménez

Este estudio analiza cómo las competencias digitales en comunicación y colaboración en línea (CYC) influyen en el rendimiento académico universitario. A partir de una muestra de 300 estudiantes, se observa que las CYC se relacionan positivamente con la motivación y los logros …

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Valorisation of Inorganic Fractions of Waste Generated by Hydrothermal Treatment of Sewage Sludge in Alkaline Cement

A. Fernández‐Jiménez, Olga Maltseva, A. Palomo, Narcisa Mihaela Marian et autres

Hydrothermal processing technology provides an innovative and promising solution to achieve significant reductions in the volume of sewage sludge and the recovery of raw materials. In this work, we evaluated the possibility of using inorganic mineral residue (IMR) from hydrothermal sewage treatment …

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Binary and ternary cements based on calcium sulphoaluminate clinker

Pilar Padilla-Encinas, A. Palomo, Ángeles G. De la Torre, A. Fernández‐Jiménez

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Mechanism for activity variation of landfilled coal ash: Deterioration in landfilling and improvement in pretreatment

Luchang Xiong, Olga Maltseva, A. Fernández‐Jiménez, Zhijun Wan et autres

Landfilled coal ash (LA) may serve as an alternative to fly coal ash (FA) as a stable and abundant supplementary cementitious material (SCM), particularly given the gradual phasing out of coal-fired power plants in many developed regions. This study investigates the physicochemical …

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Transforming landfilled coal ash in ultralow clinker binders

Luchang Xiong, Olga Maltseva, A. Fernández‐Jiménez, Zhijun Wan et autres

Abstract The gradual shortage of fly ash caused by the closure of coal‐fired power plants in some areas has stimulated increased research into novel pozzolanic supplementary cementitious materials (SCMs), with a particular focus on landfilled coal ash (LA). A novel hybrid alkaline …

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Carbonation and Phase Evolution in MgO-SiO2 Cements: Impact on Strength

Gonzalo Mármol, A. Fernández‐Jiménez, María Teresa Blanco‐Varela, I. García-Lodeiro

Magnesium silicate hydrate (M-S-H) binders, synthesized from magnesia and silica, exhibit promising mechanical and thermal properties but face challenges in early strength development due to delayed kinetics and limited MgO solubility. This study investigates the impact of early exposure to CO2-saturated atmospheres …

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Artificial precursor for alkaline cements

Pablo Martín-Rodríguez, I. García-Lodeiro, Lucía Fernández-Carrasco, María Teresa Blanco‐Varela et autres

One of the main challenges for the future development of alkaline cements is the availability of precursors. Traditional precursors (such as coal FA and the BFS) have some limitations concerning quality and quantity (the long term supply is not guaranteed). The progressive …

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Binary and Ternary Cements Based on Calcium Sulphoaluminate Clinker

Pilar Padilla Encinas, A. Palomo, Ángeles G. De la Torre, A. Fernández‐Jiménez

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