Listar por autor "García-Aranda, Miguel Ángel"

Mostrando ítems 1-20 de 104

    • Accuracy in Cement Hydration Investigations: Combined X-ray Microtomography and Powder Diffraction Analyses 

      Salcedo, Inés R.; Cuesta-Garcia, Ana Maria; Shirani, Shiva; León-Reina, Laura; García-Aranda, Miguel Ángel (MDPI, 2021-11-17)
      Cement hydration is a very complex set of processes. The evolution of the crystalline phases during hydration can be accurately followed by X-ray powder diffraction data evaluated by the Rietveld method. However, accurate ...

    • Accuracy in Rietveld quantitative phase analysis: a comparative study of strictly monochromatic Mo and Cu radiations 

      León-Reina, Laura; García-Maté, Marta; Álvarez-Pinazo, Gema; Santacruz-Cruz, Maria Isabel; Vallcorba, Oriol; [et al.] (Willey online Library, 2016)
      This study reports 78 Rietveld quantitative phase analyses using Cu K 1, Mo K 1 and synchrotron radiations. Synchrotron powder diffraction has been used to validate the most challenging analyses. From the results for ...

    • Active Sulpho-belite cements. Hydration mechanisms and mechanical properties 

      Álvarez-Pinazo, Gema (Servicio de Publicaciones y Divulgación Científica, 2015)
      The threat of climate change is considered one of the major environmental challenges for our society, where carbon dioxide (CO2) is one of the main Greenhouse gases (GHGs). Every ton of ordinary Portland cement (OPC) ...

    • Advanced synchrotron studies of ye'elimite-based cement pastes 

      García-Aranda, Miguel Ángel; Cuesta-Garcia, Ana Maria; Gomez-de-la-Torre, Maria de los Angeles; Santacruz-Cruz, Maria Isabel (2018-07-18)
      Synchrotron characterization techniques [1] are being used to study Portland-based cements and recently also CSA and related cements. A key property of these techniques is that they do not require sample preparation, so ...

    • ALBA Synchrotron Light Source 

      García-Aranda, Miguel Ángel (2015-03-23)
      ALBA synchrotron light source (www.cells.es) is the largest Spanish research infrastructure that started full operation of its first 7 beamlines on February 2013. I will divide the talk in three parts: i) the general ...

    • Alite hydration mechanism in presence of ye’elimite related to BAY cements 

      Londono-Zuluaga, Diana; Tobón, Jorge Iván; García-Aranda, Miguel Ángel; Santacruz-Cruz, Maria Isabel; Gomez-de-la-Torre, Maria de los Angeles (2019-10-08)
      One alternative to decrease CO2 emissions from ordinary Portland Cement (OPC) production consists on the development of a new kind of eco-cements composed by less calcite demanding phases. That is the case of ...

    • Alite-belite-ye'elimite cements: Effect of dopants on the clinker phase composition and properties 

      Zea-Garcia, Jesus D.; García-Aranda, Miguel Ángel; Gomez-de-la-Torre, Maria de los Angeles; Santacruz-Cruz, Maria Isabel (2018-10-30)
      Clinkers with alite-belite-ye'elimite (ABY) are considered as eco-friendly cements. Clinkering (2 Kg) of two types of ABY clinkers was optimized: standard-ABY, with CaF2 and ZnO as dopants (32.6 wt% alite, 30.4 wt% β-C2S ...

    • Aluminum Hydroxide Gel Characterization within a Calcium Aluminate Cement Paste by Combined Pair Distribution Function and Rietveld Analyses 

      Cuesta-Garcia, Ana Maria; Ichikawa, Rodrigo U.; Londono-Zuluaga, Diana; Gomez-de-la-Torre, Maria de los Angeles; Santacruz-Cruz, Maria Isabel; [et al.] (Elsevier, 2017-06)
      There are many commercially important multiphase materials which contain amorphous phases, such as cement pastes, porcelains, glass-ceramics or pharmaceutical compounds. However, the analysis of amorphous phase(s) within ...

    • Aluminum-rich belite sulfoaluminate cements: clinkering and early age hydration 

      Martín-Sedeño, M. Carmen; Cuberos, Antonio J M; Gomez-de-la-Torre, Maria de los Angeles; Álvarez-Pinazo, Gema; Ordónez, Luis M; [et al.] (Elsevier, 2009)
      Belite sulfoaluminate (BSA) cements have been proposed as environmentally friendly building materials, as their production may release up to 35% less CO2 into the atmosphere when compared to ordinary Portland cements. ...

    • Amorphous determination in calcium sulfoaluminate materials by external and internal methods 

      García-Maté, Marta; Santacruz-Cruz, Maria Isabel; Cuesta-Garcia, Ana Maria; León-Reina, Laura; García-Aranda, Miguel Ángel; [et al.] (ICE Publishing, 2014)
      External standard methodology has been successfully applied to quantify the known amounts of amorphous component that are increasingly added to cement-related materials. The consistency and accuracy of the methodology were ...

    • Applications of synchrotron x-ray powder diffraction in hydrated cements: high-resolution and high-pressure studies 

      Cuesta-Garcia, Ana Maria; Gomez-de-la-Torre, Maria de los Angeles; Santacruz-Cruz, Maria Isabel; Popescu, Catalin; García-Aranda, Miguel Ángel (2016-07-12)
      The main aim of this study is to apply synchrotron radiation techniques for the study of hydrated cement pastes. In particular, the tetracalcium aluminoferrite phase, C4AF in cement nomenclature, is the major iron-containing ...

    • Belite cements and their activation 

      Cuesta-Garcia, Ana Maria; Ayuela, Andres; García-Aranda, Miguel Ángel (Elsevier, 2020-11)
      Belite cements, BCs, containing mainly belite, alite and calcium aluminates, are currently used as low heat cements. These binders produce high amounts of C–S–H gel and have very good durability properties which are reviewed. ...

    • Belite hydration at high temperature and pressure by in situ synchrotron powder diffraction 

      Morales-Cantero, Alejandro; Gomez-de-la-Torre, Maria de los Angeles; Cuesta-Garcia, Ana Maria; Fraga-López, Edmundo; Shirani, Shiva; [et al.] (2020-10-16)
      Portland cements are currently used as Oil‐Well‐Cements for the sheath between the metal casing and the borehole. At high pressures and temperatures, the resulting C-S-H gel(s) is partly unstable and it can react to give ...

    • Calcium aluminate cement conversion analysed by ptychographic nanotomography 

      Shirani, Shiva; Cuesta-Garcia, Ana Maria; Gomez-de-la-Torre, Maria de los Angeles; Diaz, Ana; Trtrik, Pavel; [et al.] (Elsevier, 2020-08-17)
      Calcium aluminate cements are used for special applications but are nowadays banned for general structural purposes due to the calcium aluminate hydrate conversion, that has led, for concretes fabricated with high water ...

    • Chemistry and Mass Density of Aluminum Hydroxide Gel in Eco-Cements by Ptychographic X-ray Computed Tomography 

      Cuesta-Garcia, Ana Maria; Gomez-de-la-Torre, Maria de los Angeles; Santacruz-Cruz, Maria Isabel; Trtik, Pavel; Da Silva, Julio C.; [et al.] (ACS, 2017)
      Eco-cements are a desirable alternative to ordinary Portland cements because of their lower CO2 footprints. Some ye’elimite-based ecocements are attracting a lot of interest. Understanding the reasons for the mechanical ...

    • Clinkering and early age hydration characterization of Belite-Alite Calcium Sulfoaluminate (BACSA) cements 

      Londono-Zuluaga, Diana; Álvarez-Pinazo, Gema; Tobón, Jorge Iván; García-Aranda, Miguel Ángel; Santacruz-Cruz, Maria Isabel; [et al.] (2015-10-26)
      In this work, four BACSA clinkers with different compositions (belite ~ 70-55 wt %, alite ~ 10-15 wt % and ye’elimite ~ 10-15 wt %) were synthesized (at laboratory scale). Lime, gypsum, kaolin and sand were used as raw ...

    • Clinkering and hydration of belite-ye'elimite-alite cement 

      Londono-Zuluaga, Diana; Tobón, Jorge Iván; García-Aranda, Miguel Ángel; Santacruz-Cruz, Maria Isabel; Gomez-de-la-Torre, Maria de los Angeles (Elsevier, 2017)
      Some belite-ye´elimite-ferrite (BYF) cements present low mechanical strengths mainly due to the slow reactivity of belite. A solution to this problem may be the activation of BYF clinkers by preparing them with a coexistence ...

    • Clinkering of calcium sulfoaluminate clinkers: polymorphism of ye'elimite 

      Gomez-de-la-Torre, Maria de los Angeles; García-Aranda, Miguel Ángel; Santacruz-Cruz, Maria Isabel; Cuesta-Garcia, Ana Maria; Zea-Garcia, Jesus D.; [et al.] (2018)
      The manufacture of CSA cements is more environmentally friendly than that of OPC as it releases less CO2. This reduction depends on CSA composition and is due to three factors: i) less emissions from decarbonation in the ...

    • A comparative study of experimental configurations in synchrotron pair distribution function 

      Zea-Garcia, Jesus D.; Gomez-de-la-Torre, Maria de los Angeles; García-Aranda, Miguel Ángel; Cuesta-Garcia, Ana Maria (MDPI - Publisher of Open Access Journals, 2019-04-25)
      The identification and quantification of amorphous components and nanocrystalline phases with very small crystal sizes, smaller than ~3 nm, within samples containing crystalline phases is very challenging. However, this ...

    • Cristaloquímica y Conductividad de ion óxido en Oxo-cuspidinas 

      Martín-Sedeño, María del Carmen (Universidad de Málaga, Servicio de Publicaciones, 2006)
      El trabajo de investigación se ha centrado en el estudio (preparación y caracterización estructural y eléctrica) de las oxo-cuspidinas con fórmula general A4(M2O71)O2 (A=La, Nd, Sm, Gd; M=Ga, Al) como posibles materiales ...