Listar por autor "Álvarez-Pinazo, Gema"
Mostrando ítems 1-20 de 21
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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, María Isabel
; Vallcorba, Oriol; Gómez-de-la-Torre, María de los Ángeles; García-Aranda, Miguel Ángel[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
(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) ... -
Aluminum-rich belite sulfoaluminate cements: clinkering and early age hydration
Martín-Sedeño, M. Carmen; Cuberos, Antonio J.M.; Gómez-de-la-Torre, María de los Ángeles; Álvarez-Pinazo, Gema; Ordónez, Luis M.; Gateshki, Milen; García-Aranda, Miguel Ángel[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. ... -
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, María Isabel; Gómez-de-la-Torre, María de los Ángeles[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 of calcium sulfoaluminate clinkers: polymorphism of ye'elimite
Gómez-de-la-Torre, María de los Ángeles; García-Aranda, Miguel Ángel; Santacruz-Cruz, María Isabel; Cuesta-García, Ana María; Zea-Garcia, Jesus D.; Londono-Zuluaga, Diana; García-Maté, Marta; Álvarez-Pinazo, Gema[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 ... -
Hydration mechanisms of two polymorphs of synthetic ye'elimite
Cuesta-García, Ana María; Álvarez-Pinazo, Gema; Sanfeliz-Garcia, Susana; Peral, Inma; García-Aranda, Miguel Ángel; Gómez-de-la-Torre, María de los Ángeles[et al.] (Elsevier, 2014-05-26)
Ye'elimite is the main phase in calcium sulfoaluminate cements and also a key phase in sulfobelite cements. However, its hydrationmechanismis not well understood. Here we reported newdata on the hydration behavior of ... -
Hydration of Belite-Ye’elimite-Ferrite(BYF) cements with different calcium sulfate sources
Álvarez-Pinazo, Gema; Santacruz-Cruz, María Isabel; García-Aranda, Miguel Ángel; Gómez-de-la-Torre, María de los Ángeles (ICE publishing, 2016-07)
Belite-Ye’elimite-Ferrite cements, BYF, are a sustainable alternative to OPC to reduce CO2 emissions. The aim of this research is to understand the influence of the sulfate source on the hydration of two laboratory-prepared ... -
Hydration Reactions and Mechanical Strength Developments of Iron- Rich Sulfobelite Eco-cements
Álvarez-Pinazo, Gema; Santacruz-Cruz, María Isabel; León-Reina, Laura; García-Aranda, Miguel Ángel; Gómez-de-la-Torre, María de los Ángeles (2013)
Belite calcium sulfoaluminate (BCSA) cements are low-CO2 building materials. However, their hydration behavior and its effect on mechanical properties have still to be clarified. Here, we report a full multitechnique study ... -
In-situ early age hydration of cement-based materials by synchrotron X-ray powder diffraction
García-Maté, Marta; Álvarez-Pinazo, Gema; León-Reina, Laura; Gómez-de-la-Torre, María de los Ángeles; Santacruz-Cruz, María Isabel; García-Aranda, Miguel Ángel; Chou, K. W.; Neuhausen, U.; Petrash, S[et al.] (2015-07-01)
Cement based binders are building materials of worldwide importance. Since these samples are very complex, the knowledge/control of their mineralogical composition are essential to design and predict materials with ... -
In-situ early-age hydration study of sulfobelite cements by synchrotron powder diffraction
Álvarez-Pinazo, Gema; Cuesta-García, Ana María; García-Maté, Marta; Santacruz-Cruz, María Isabel; Ramírez-Losilla, Enrique; Sanfélix, Susana G.; Fauth, François[et al.] (Karen Scrivener, 2014)
Eco-friendly belite calcium sulfoaluminate (BCSA) cement hydration behavior is not yet well understood. Here,we report an in-situ synchrotron X-ray powder diffraction study for the first hours of hydration of BCSA ... -
Quantitative phase Analisis: A comparative study of Mo and Cu strictly monochromatic radiations
Gómez-de-la-Torre, María de los Ángeles; León-Reina, Laura; Cuesta-García, Ana María; García-Maté, Marta; Álvarez-Pinazo, Gema; Santacruz-Cruz, María Isabel; Vallcorba, Oriol; García-Aranda, Miguel Ángel[et al.] (2016-06-27)
A comparison of the Rietveld quantitative phase analyses (RQPA) obtained using Cu-Kα1, Mo-Kα1, and synchrotron strictly monochromatic radiations is presented. The main aim is to test a simple hypothesis: high energy ... -
Rietveld quantitative phase analyses of SRM 2686a: a standard Portland clinker
García-Maté, Marta; Álvarez-Pinazo, Gema; León-Reina, Laura; Gómez-de-la-Torre, María de los Ángeles (2018-10-03)
SRM 2686a is a NIST reference Portland clinker with reported mineralogical analysis from powder diffraction and electron microscopy. This sample is used in ASTM C1365 test method for Rietveld quantitative phase analysis ... -
Rietveld quantitative phase analysis of yeelimite-containing cements
Álvarez-Pinazo, Gema; Cuesta-García, Ana María; García-Maté, Marta; Santacruz-Cruz, María Isabel; Ramírez-Losilla, Enrique; Gómez-de-la-Torre, María de los Ángeles; León-Reina, Laura; García-Aranda, Miguel Ángel[et al.] (Karen Scrivener, 2012)
Yeelimite-containing cements are attracting attention for their tailored properties. Calcium sulfoaluminate, CSA, cements have high contents of Yeelimite and they are used for special applications. Belite calcium sulfoaluminate, ... -
Rietveld quantitative phase analysis of Yeelimite-containing cements
Álvarez-Pinazo, Gema; Cuesta-García, Ana María; García-Maté, Marta; Santacruz-Cruz, María Isabel; Ramírez-Losilla, Enrique; Gómez-de-la-Torre, María de los Ángeles; León-Reina, Laura; García-Aranda, Miguel Ángel[et al.] (Elsevier, 2012-03-26)
Yeelimite-containing cements are attracting attention for their tailored properties. Calcium sulfoaluminate, CSA, cements have high contents of Yeelimite and they are used for special applications. Belite calcium sulfoaluminate, ... -
Rietveld quantitative phase analysis with molybdenum radiation
Cuesta-García, Ana María; Álvarez-Pinazo, Gema; García-Maté, Marta; Santacruz-Cruz, María Isabel; García-Aranda, Miguel Ángel; Gómez-de-la-Torre, María de los Ángeles; León-Reina, Laura[et al.] (Cambridge Core, 2014)
Building materials are very complex samples of worldwide importance; hence quantitative knowledge of their mineralogical composition is necessary to predict performances. Rietveld quantitative phase analysis (RQPA) allows ... -
Structure of stratlingite and effect of hydration methodology on microstructure
Santacruz-Cruz, María Isabel; Gómez-de-la-Torre, María de los Ángeles; Álvarez-Pinazo, Gema; Cabeza-Díaz, Aurelio; Cuesta-García, Ana María; Sanz, Jesus; García-Aranda, Miguel Ángel[et al.] (ICE publishing, 2015)
Stratlingite, Ca4Al2(OH)12[AlSi(OH)8]2•2H2O, is an AFm phase which appears as hydration product of aluminum-rich cements. These binders may be calcium aluminate cements, calcium sulfoaluminate cements and also Belite Calcium ... -
The use of mo and cu monochromatic radiations for quantitative phase analysis: study of the accuracy
Gómez-de-la-Torre, María de los Ángeles; León-Reina, Laura; Cuesta-García, Ana María; García-Maté, Marta; Álvarez-Pinazo, Gema; Santacruz-Cruz, María Isabel; Vallcorba, Oriol; García-Aranda, Miguel Ángel[et al.] (2016-06-27)
Cement hydration is a very complex process in which crystalline phases are dissolving in water and after supersaturation hydrated crystalline and amorphous phases precipitate. Great efforts are being made to develop ... -
X-ray diffraction, cements and environment, three worlds in one
Zea-Garcia, Jesus D.; Gómez-de-la-Torre, María de los Ángeles; Santacruz-Cruz, María Isabel; Londono-Zuluaga, Diana; García-Maté, Marta; Álvarez-Pinazo, Gema; García-Aranda, Miguel Ángel; Cuesta-García, Ana María; León-Reina, Laura; Franco-Duro, Francisco Ignacio; Tobón, Jorge Iván[et al.] (2017-12-13)
This keynote lecture will be focused on the strategies for reducing CO2 emissions in the cement production. Concretely, the production of ecocements with optimised formulations that yield reductions in CO2 emissions of up ...