Exploració per autor "Martínez Ramírez, Sagrario"

Ara es mostren els items 1-20 de 22

    • Carbonation of ternary building cementing materials 

      Fernández Carrasco, Lucía; Torrens Martín, David; Martínez Ramírez, Sagrario (2012-11)
      Article
      Accés restringit per política de l'editorial
      The carbonation processes of ettringite and calcium aluminate hydrates phases developed by hydration of calcium aluminate cement, fly ash and calcium sulphate ternary mixtures have been studied. The hydrated samples were ...

    • Carbonation on ternary cement systems 

      Martínez Ramírez, Sagrario; Fernández Carrasco, Lucía (2012-05-01)
      Article
      Accés restringit per política de l'editorial
      The main hydration reaction product in the ternary system fly ash, calcium sulphate and calcium aluminate cement (40/20/40) at 20°C is a hydrated calcium sulfoaluminate compound, an AFt phase slightly different from ...

    • Carbonation-induced mineralogical changes in coal mining waste blended cement pastes and their influence on mechanical and microporosity properties 

      Frias Rojas, Moisés; Vigil de la Villa, Raquel; García Jiménez, Rosario; Rodríguez Largo, Olga; Fernández Carrasco, Lucía; Martínez Ramírez, Sagrario (2018-04)
      Article
      Accés obert
      The worldwide pursuit of new eco-efficient pozzolans is ongoing. Kaolinite-based waste is an eco-friendly source of recycled metakaolinite, a highly pozzolanic product. In this study, a blended cement paste containing 20% ...

    • Cements based on kaolinite waste 

      García Giménez, Rosario; Vigil de la Villa, Raquel; Frias Rojas, Moisés; Martínez Ramírez, Sagrario; Vegas, Iñigo; Fernández Carrasco, Lucía (European Geosciences Union (EGU), 2018-08)
      Article
      Accés obert
      The cement industry involves high-energy consumption that generates high CO2 emissions into the atmosphere. Environmental concerns can be addressed by replacing parts of Portland cement clinkers with pozzolanic materials ...

    • Chemical and mineral transformations that occur in mine waste and washery rejects during pre-utilization calcination 

      Vigil de la Villa, Raquel; Frias Rojas, Moisés; García Jiménez, Rosario; Martínez Ramírez, Sagrario; Fernández Carrasco, Lucía (2014-08-13)
      Article
      Accés restringit per política de l'editorial
      The mineralogical content of coal mine waste consists primarily of inorganic compounds which can be converted into a metakaolin-based product under controlled activation conditions that is also a highly pozzolanic material. ...

    • Concrete/glass construction and demolition waste (CDW) synergies in ternary eco-cement-paste mineralogy 

      Vigil de la Villa, Raquel; Frias Rojas, Moises; Martínez Ramírez, Sagrario; Fernández Carrasco, Lucía; García Giménez, Rosario (Multidisciplinary Digital Publishing Institute (MDPI), 2022-07)
      Article
      Accés obert
      The study described sought further understanding of the synergies in a mix of CDW pozzolans, containing (calcareous and siliceous) concrete and glass waste, used to prepare ternary eco-cement paste bearing 7% of the binary ...

    • Evaluation of a lime-mediated sewage sludge stabilisation process. Product characterisation and technological validation for its use in the cement industry 

      Flores, J.; Larrotcha, E.; Fos, C.; Husillos Rodríguez, N.; Granados, R.J.; Blanco Varela, M.Teresa; Cortina Pallás, José Luís; Martínez Ramírez, Sagrario; Marsal Astort, Montserrat; Guillem, Manel; Puig, J. (2012-03)
      Article
      Accés restringit per política de l'editorial
      This paper describes an industrial process for stabilising sewage sludge (SS) with lime and evaluates the viability of the stabilised product, denominated Neutral, as a raw material for the cement industry. Lime not only ...

    • Evolution to carbonated compounds of phases developed on ternary systems materials 

      Fernández Carrasco, Lucía; Torrens Martín, David; Morales Martínez, Laura María; Martínez Ramírez, Sagrario; Fernández, Pedro (Instituto de Ciencias de la Construcción Eduardo Torroja (ICCET), 2011)
      Comunicació de congrés
      Accés obert
      The incorporation of supplementary cementitious materials to the cement industry is an alternative to reduce consume of large amounts of raw materials and gives up a huge spectrum of blended cements that have been noted ...

    • In situ chemical modification of C–S–H induced by CO2 laser irradiation 

      Martínez Ramírez, Sagrario; Díaz Sol, Luis M.; Martín Garrido, Moisés; Fernández Carrasco, Lucía; Torrens Martín, David (2018-02)
      Article
      Accés obert
      Fire-induced compositional changes lead to strength loss and even failure in cement and concrete. Calcium silicate hydrate (C–S–H) gel, the main product of cement hydration, dehydrates at 25–200 °C, while temperatures of ...

    • Influence of ZnO on the activation of kaolinite-based coal waste: pozzolanic activity and mineralogy in the pozzolan/lime system 

      García Giménez, Rosario; Vigil de la Villa, Raquel; Martínez Ramírez, Sagrario; Fernández Carrasco, Lucía; Frias Rojas, Moisés (2018-05)
      Article
      Accés obert
      One inconvenience presented by the thermal activation of kaolinite-based wastes is their low content of metakaolinite, a highly pozzolanic product listed in current standards for the manufacture of commercial cements. The ...

    • Infrared and Raman vibrational modelling of ß-C2S and C3S compounds 

      Timón Salinero, Vicente; Torrens Martín, David; Fernández Carrasco, Lucía; Martínez Ramírez, Sagrario (2023-07)
      Article
      Accés obert
      Density Functional Theory was applied to obtain a refined IR and Raman theoretical vibrational spectra of the major silicate phases of Portland cement, i.e. dicalcium silicate (ß-C2S) and tricalcium silicate (C3S). We ...

    • Infrared spectroscopy in the analysis of building and construction materials 

      Fernández Carrasco, Lucía; Torrens Martín, David; Morales, L.M.; Martínez Ramírez, Sagrario (Intech, 2012-03-30)
      Capítol de llibre
      Accés obert

    • Mineralogical study of calcined coal waste in a pozzolan/Ca(OH)(2) system 

      García Jiménez, Rosario; Vigil de la Villa, Raquel; Frias Rojas, Moisés; Rodríguez Largo, Olga; Martínez Ramírez, Sagrario; Fernández Carrasco, Lucía; de Soto, I. S.; Villar Cocina, E (2015-05-01)
      Article
      Accés restringit per política de l'editorial
      Activated carbon mining waste influences the formation of hydrated phases, their saturation indexes and mineral stability fields during pozzolanic reactions. The behavior of these reactions is predicted in this study by ...

    • Multi-technique characterization of a fine fraction of CDW and assessment of reactivity in a CDW/lime system 

      Frias Rojas, Moisés; Vigil de la Villa, Raquel; Martínez Ramírez, Sagrario; Fernández Carrasco, Lucía; Villar Cociña, Ernesto; García Giménez, Rosario (2020-07)
      Article
      Accés obert
      This study analysed the fine particle (<5 mm) waste generated during siliceous or calcareous (depending on the composition of the original aggregate) concrete waste crushing. In the absence of industrial applications, such ...

    • New developments in low clinker cement paste mineralogy 

      Frias Rojas, Moisés; Vigil de la Villa, Raquel; Garcia, Rosario; Martínez Ramírez, Sagrario; Fernández Carrasco, Lucía (2018-12)
      Article
      Accés obert
      The use of industrial waste as a cement addition often changes the composition and development of the hydrated phases and with them matrix performance and durability, in particular at later ages. The effect of the presence ...

    • Nuevos cementos eco-eficientes elaborados con la fracción fina de hormigón reciclado para futuras aplicaciones ingenieriles 

      Monasterio Jaqueti, Manuel; Frias Rojas, Moisés; García Giménez, Rosario; Vigil de la Villa, Raquel; Martínez Ramírez, Sagrario; Fernández Carrasco, Lucía; Lahoz Ruiz, Eduardo; Vegas, Iñigo; Moreno Juez, J. (Associação Brasileira de Patologia das Construções (ALCONPAT), 2021)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      Los residuos de la construcción son un gran problema medioambiental. Europa ha priorizado su reciclaje para nuevas construcciones ingenieriles. Sin embargo, la fracción fina de los residuos de hormigón, no presenta ...

    • Raman Spectroscopy of Anhydrous and Hydrated Calcium Aluminates and Sulfoaluminates 

      Torrens Martín, David; Fernández Carrasco, Lucía; Martínez Ramírez, Sagrario; Ibáñez, Jordi; Artús, Lluís; Matschei, Thomas (2013-10-04)
      Article
      Accés restringit per política de l'editorial
      Recent investigations have revealed the great potential of Raman spectroscopy for the characterization of clinker minerals and commercial Portland cements. The usefulness of this technique for the identification of anhydrous, ...

    • Raman spectroscopy: applycation to cementitious systems 

      Martínez Ramírez, Sagrario; Fernández Carrasco, Lucía (Nova Science Publishers, 2010-12-13)
      Capítol de llibre
      Accés obert
      Raman scattering was discovered by Krisma and Raman in 1928. Until approximately 1986, the Raman literature was dominated by physical and structural investigations, with relatively few reports of Raman spectroscopy applied ...

    • Reactivity of binary construction and demolition waste mix as supplementary cementitious materials 

      Vigil de la Villa, Raquel; Frias Rojas, Moises; Martínez Ramírez, Sagrario; Fernández Carrasco, Lucía; Villar Cociña, Ernesto; García Giménez, Rosario (Multidisciplinary Digital Publishing Institute (MDPI), 2021-11)
      Article
      Accés obert
      Calcareous and siliceous CDW wastes from concrete and glass wastes when mixed in binary mixtures has been analyzed in this study. Fine CDW fractions (<5 mm) of different sorts are selected: siliceous waste (HsT), calcareous ...

    • Stabilization of photovoltaic panels cell wastes in building material matrices 

      Fernández Carrasco, Lucía; Ferrer, Rober; Aponte Hernández, Diego Fernando; Martínez Ramírez, Sagrario (Consejo Superior de Investigaciones Científicas (CSIC), 2009)
      Text en actes de congrés
      Accés obert
      This is a study about the hydration process of a mixture of Portland cement and solar photovoltaic cells waste. The nature of the hydration products of different compositions of these mixtures have been evaluated, at 20º ...