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  • Informe projecte "Betaquímica"

     Haurie Ibarra, Laia; Lacasta Palacio, Ana Maria; Formosa Mitjans, Joan
    Date: 2014-12-08
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  • Pilot-scale road subbase made with granular material formulated with MSWI bottom ash and stabilized APC fly ash: environmental impact assessment

     del Valle Zermeño, Ricardo; Formosa Mitjans, Joan; Prieto Fernández, Mario; Nadal Albiol, Ramon; Niubó Eslava, Maria; Chimenos Ribera, Josep Maria
    Journal of hazardous materials
    Date of publication: 2014-02-15
    Journal article

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    A granular material (GM) to be used as road sub-base was formulated using 80% of weathered bottom ash (WBA) and 20% of mortar. The mortar was prepared separately and consisted in 50% APC and 50% of Portland cement. A pilot-scale study was carried on by constructing three roads in order to environmentally evaluate the performance of GM in a real scenario. By comparing the field results with those of the column experiments, the overestimations observed at laboratory scale can be explained by the potential mechanisms in which water enters into the road body and the pH of the media. An exception was observed in the case of Cu, whose concentration release at the test road was higher. The long-time of exposure at atmospheric conditions might have favoured oxidation of organic matter and therefore the leaching of this element. The results obtained showed that immobilization of all heavy metals and metalloids from APC is achieved by the pozzolanic effect of the cement mortar. This is, to the knowledge of the authors, the only pilot scale study that is considering reutilization of APC as a safe way to disposal. (C) 2013 Elsevier B.V. All rights reserved.

    A granular material (GM) to be used as road sub-base was formulated using 80% of weathered bottom ash (WBA) and 20% of mortar. The mortar was prepared separately and consisted in 50% APC and 50% of Portland cement. A pilot-scale study was carried on by constructing three roads in order to environmentally evaluate the performance of GM in a real scenario. By comparing the field results with those of the column experiments, the overestimations observed at laboratory scale can be explained by the potential mechanisms in which water enters into the road body and the pH of the media. An exception was observed in the case of Cu, whose concentration release at the test road was higher. The long-time of exposure at atmospheric conditions might have favoured oxidation of organic matter and therefore the leaching of this element. The results obtained showed that immobilization of all heavy metals and metalloids from APC is achieved by the pozzolanic effect of the cement mortar. This is, to the knowledge of the authors, the only pilot scale study that is considering reutilization of APC as a safe way to disposal.

  • Estudi de mostres de paviment

     Formosa Mitjans, Joan
    Date: 2013-02
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  • Caracterització d'hidròxids de magnesi pel seu ús com a retardants de flama

     Haurie Ibarra, Laia; Lacasta Palacio, Ana Maria; Formosa Mitjans, Joan
    Date: 2013-09-16
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  • Determinació del tipus d'acer de perfils metàl·lics

     Ramirez Casas, Judith; Formosa Mitjans, Joan
    Date: 2013-04
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  • Informe de resultats d'assaig de DRX de dues mostres de formigó

     Navarro Ezquerra, Maria Antonia; Formosa Mitjans, Joan
    Date: 2013-06
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  • Application of the design of experiments to study the effect of additions and additives in mortar properties

     Haurie Ibarra, Laia; Formosa Mitjans, Joan; Chimenos Ribera, Josep Maria; Niubó Eslava, Maria
    European and Exhibition Congress on Advanced Materials and Processes
    Presentation's date: 2013-09-09
    Presentation of work at congresses

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    In this study we have studied the influence of cement reactive additions and additives on the workability and mechanical properties of the Portland cement. In order to obtain maximum information and evaluate possible interactions between factors we have used an Experimental Design (DoE). We have tested two types of cement, one without additions (CEM I 42,5R) and the other one with a content of fly ashes between 6 and 20% (CEM II/A-V 42,5R). The experimental planning was based on DoE response surface methodology. Therefore, we have developed two identical experiments designs, one for each type of cement. Thus, we prepared several mortar formulations keeping constant the aggregate and cement amount and varying the water and superplasticizer additive content. Fresh mortar properties, such as workability and density, together with mechanical properties at different ages (7, 28 and 90 days) were measured. The use of DoE allows us to obtain prediction models giving not only the influence of one variable on the studied property, but also the interaction between two variables. Furthermore, variation of the mortar properties is represented graphically based on the mathematical models. Response surface analysis offers the possibility to optimize the dosages according to the desired requirements. In this manner, an optimal mortar formulation is obtained that provides compressive strength up to 80Mpa at 90 days of age.

  • Study of porosity on CBPC mortars formulated with low-grade magnesium oxide as a function of the amount of admixture and setting conditions

     Haurie Ibarra, Laia; Formosa Mitjans, Joan; Chimenos Ribera, Josep Maria; Valle, Ricardo; Niubó Eslava, Maria
    European and Exhibition Congress on Advanced Materials and Processes
    Presentation's date: 2013-09-10
    Presentation of work at congresses

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    This research work aims to study the porosity of these CBPC formulated with LG-MgO as a function of the amount of setting retardant admixtures, such as boron compounds or polyphosphates. These additives improve the fluidity of the fresh paste and its workability, shifting the equilibrium of acid - base reaction between the metal oxide and the phosphates. By this way, the initial setting time can be delayed and the release of the heat flux from exothermic reaction decreased. Both parameters have a direct influence on the percentage and the size of the pores generated, which leads to a variation of the capillarity and permeability of these materials. Moreover, the vibration of the slurry during the setting process allows eliminating the air retained during its homogenization and from the water vapour generated as a result of the exothermal reaction. This results in a lower porosity and / or a decrease in the pore size, and therefore affects the material properties. The study of vibration time can be a working parameter to control the porosity and the pore size for the above mentioned as well as others

  • Interaction between low-grade magnesium oxide and boric acid in chemically bonded phosphate ceramics formulation

     Formosa Mitjans, Joan; Chimenos Ribera, Josep Maria; Lacasta Palacio, Ana Maria; Niubó Eslava, Maria
    Ceramics international
    Date of publication: 2012-03
    Journal article

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  • Hydration of a low-grade magnesium oxide. Lab-scale study

     del Valle Zermeño, Ricardo; Chimenos Ribera, Josep Maria; Formosa Mitjans, Joan; Fernández, Ana Inés
    Journal of chemical technology & biotechnology
    Date of publication: 2012-12
    Journal article

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    BACKGROUND:Lowgrademagnesiumoxide (LG-MgO) is a by-product fromthe calcinationofnatural magnesite that is currently hydrated to magnesium hydroxide by storing it in the open for up to 6 months. It is eight to ten times cheaper than pure magnesium oxide and therefore the revalorization of this by-product is very attractive for those applications requiring great quantities of magnesium hydroxide for which high purity is not required. Here the hydration of LG-MgO is studied as a function of two parameters: hydrating agent and temperature. RESULTS: Addition of acetic acid during the hydration of LG-MgO improved the effectiveness of treatment. At 50 ¿C, the maximum percentage hydration was 40% in pure water and increased to 65% and 70% using aqueous solutions of 0.5 and 1.0 mol L-1 acetic acid. Increase of temperature also had a positive effect on the final degree of hydration. When the treatment was carried out with 0.5 mol L-1 acetic acid, the hydration increased from 50 to 65 and 80% at 25, 50 and 90 ¿C respectively. Accordingly under the optimum conditions of 90 ¿C and 0.5 mol L-1 acetic acid 80% hydration was achieved within 8 h. CONCLUSIONS: The results showed that much shorter hydration times are possible and therefore an industrial alternative to the spontaneous process could satisfy an increasing demand for magnesium hydroxide. Moreover, agitation is not needed as the reaction is chemically controlled.

  • Formulaciones de nuevos morteros y cementos especiales basadas en subproductos de magnesio

     Formosa Mitjans, Joan
    Defense's date: 2012-12-03
    Universitat de Barcelona
    Theses

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  • BAM Bioarquitectura Mediterránea

     Bosch González, Montserrat; Lacasta Palacio, Ana Maria; Rosell Amigo, Juan Ramon; Ciudad Alvarez, Aleix; Formosa Mitjans, Joan; Gómez Soberón, José Manuel Vicente; Haurie Ibarra, Laia; Hormias Laperal, Emilio; Monton Lecumberri, Joaquin; Navarro Ezquerra, Maria Antonia; Ramirez Casas, Judith; Rodriguez Cantalapiedra, Inmaculada; Ruiz Merida, Francsico; Segues Aguasca, Edgar
    Award or recognition

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  • Difracció de raigs X de mostres ceràmiques

     Formosa Mitjans, Joan
    Date: 2012-12
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  • Thermal study of low-grade magnesium hydroxide used as fire retardant and in passive fire protection

     Formosa Mitjans, Joan; Chimenos Ribera, Josep Maria; Lacasta Palacio, Ana Maria; Haurie Ibarra, Laia
    Thermochimica acta
    Date of publication: 2011-03-12
    Journal article

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    Low-grade magnesium hydroxide is being used with very promising results as flame retardant filler in polymeric materials and as aggregate in the formulation of mortars for passive fire protection, combining an economic and sustainable solution. Simultaneous TGA–DSC was used to evaluate low-grade magnesium hydroxide thermal decomposition in order to examine the suitability of this product for a broad range of temperatures. Thermal analysis in air shows an unexpected exothermic peak, as well as the endothermic peaks corresponding to the decomposition of magnesium hydroxide, magnesite and dolomite. Thermal decomposition using nitrogen as gasflowdoes not show the exothermic peak, whereas anewendothermic peak corresponding to decomposition of calcite appears. In situXRDpatterns collected in air atmosphere at high temperature allows determining the presence of anhydrite, which was related to direct sulphation of calcite from the sulphur trioxide generated during the combustion of petcoke adsorbed on the particle surface of the low-grade magnesium hydroxide

  • Improvement of passive fire protection in a gypsum panel by adding inorganic fillers: Experiment and theory

     Ciudad Alvarez, Aleix; Lacasta Palacio, Ana Maria; Haurie Ibarra, Laia; Formosa Mitjans, Joan; Chimenos Ribera, Josep Maria
    Applied thermal engineering
    Date of publication: 2011-12
    Journal article

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  • Novel fire-protecting mortars formulated with magnesium by-products

     Formosa Mitjans, Joan; Chimenos Ribera, Josep Maria; Lacasta Palacio, Ana Maria; Haurie Ibarra, Laia; Rosell Amigo, Juan Ramon
    Cement and concrete research
    Date of publication: 2011-02
    Journal article

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  • DINÁMICA NO LINEAL Y ESTOCÁSTICA EN SISTEMAS FÍSICOS Y BIOFÍSICOS

     Ciudad Alvarez, Aleix; Haurie Ibarra, Laia; Formosa Mitjans, Joan; Lacasta Palacio, Ana Maria; Meca Alvarez, Esteban; Peñaranda Ayllon, Angelina; Ramirez de La Piscina Millan, Laureano
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  • Combined use of MSWI bottom ash and fly ash as aggregate in concrete formulation: environmental and mechanical considerations

     Gines, O; Chimenos Ribera, Josep Maria; Vizcarro, A; Formosa Mitjans, Joan; Rosell Amigo, Juan Ramon
    Journal of hazardous materials
    Date of publication: 2009-09
    Journal article

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  • GRUP INTERDISCIPLINAR DE CIÈNCIA I TECNOLOGIA A L'EDIFICACIÓ (GICITED)

     Ciudad Alvarez, Aleix; Bosch González, Montserrat; Ramirez Casas, Judith; Haurie Ibarra, Laia; Formosa Mitjans, Joan; Monton Lecumberri, Joaquin; Navarro Ezquerra, Maria Antonia; Rosell Amigo, Juan Ramon; Rodriguez Cantalapiedra, Inmaculada; Gómez Soberón, José Manuel Vicente; Hormias Laperal, Emilio; Ruiz Merida, Francsico; Segues Aguasca, Edgar; Lacasta Palacio, Ana Maria
    Participation in a competitive project

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  • Modeling the heating rate dependence of endothermc reactions in building materials: kinetic theoryapplied to spatially extended systems

     Lacasta Palacio, Ana Maria; Ciudad Alvarez, Aleix; Haurie Ibarra, Laia; Formosa Mitjans, Joan
    International Conference on Diffusion in Solids and Liquids
    Presentation's date: 2009-06-24
    Presentation of work at congresses

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  • Comparative study of magnesium by-products and vermiculite formulations to obtain fire resitant mortars

     Formosa Mitjans, Joan; Haurie Ibarra, Laia; Chimenos Ribera, Josep Maria; Lacasta Palacio, Ana Maria; Rosell Amigo, Juan Ramon
    Materials science forum
    Date of publication: 2008-06
    Journal article

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  • Cementos químicos formulados con subproductos de óxido de magnesio

     Formosa Mitjans, Joan; Aranda, M A; Chimenos Ribera, Josep Maria; Rosell Amigo, Juan Ramon; Fernández, A I; Ginés, O
    Sociedad Española de Cerámica y del Vidrio
    Date of publication: 2008-10
    Journal article

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  • Characterization of poly(ethylene-co-vinyl acetate) (EVA) filled with low grade magnesium hydroxide

     Fernández, Ana Inés; Haurie Ibarra, Laia; Formosa Mitjans, Joan; Chimenos Ribera, Josep Maria; de Sousa Pais Antunes, Marcelo; Velasco Perero, Jose Ignacio
    Polymer degradation and stability
    Date of publication: 2008
    Journal article

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    Low-grade magnesium hydroxide (LG-MH) is a solid by-product that undergoes an endothermic decomposition in the temperature range of 300–750 C. Due to its thermal behaviour and its lower cost relative to pure Mg(OH)2, it was studied as a non-halogenated flame retardant filler in a 28% vinyl acetate (VA) content poly(ethylene-co-vinyl acetate) matrix. The solid was characterized by XRF and the crystalline phases determined by XRD, composed predominantly of Mg(OH)2 and calcium and magnesium carbonates. Particle size reduction was performed by both mechanical as well as air jet milling in order to optimize the particle size distribution. Composites with different filler concentrations were prepared to evaluate the mechanical properties and flame retardancy by means of limiting oxygen index tests. LOI was also determined in specimens filled with commercial flame-retardants to analyse the effectiveness of this solid

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    Chemically bonded cements formulated with by-products of magnesium oxide  Open access

     Formosa Mitjans, Joan; Aranda, Ma; Chimenos Ribera, Josep Maria; Rosell Amigo, Juan Ramon; Gines, O; Fernández Renna, Ana Inés
    Boletín de la Sociedad Española de Cerámica y Vidrio
    Date of publication: 2008-10
    Journal article

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    The casting of magnesium and potassium phosphate (KMgPO4¿6H2O; K-struvite) cements becomes possible after the aqueous reaction between magnesium oxide and potassium dihydrogen phosphate. This reaction is quite exothermic and allows the resulting paste setting in just few minutes. Those cements, when are cast with magnesium oxides of high purity, are used to retain and encapsulate special residues and as repairing concrete mortar, as it is described in the bibliography. However, it is also possible formulate those cements using low grade magnesium oxides, which cost are nearly 10 or 15 times cheaper than those of high grade. The aim of this work is to evaluate the possibility of using low grade magnesium oxides (¿70% MgO), obtained from the calcinations process of natural magnesites, for KMgPO4¿6H2O cement casting. The research and selection of the best formulation for obtaining that cement will be done also from the point of view of their mechanical properties as for their setting time.

    The casting of magnesium and potassium phosphate (KMgPO4•6H2O; K-struvite) cements becomes possible after the aqueous reaction between magnesium oxide and potassium dihydrogen phosphate. This reaction is quite exothermic and allows the resulting paste setting in just few minutes. Those cements, when are cast with magnesium oxides of high purity, are used to retain and encapsulate special residues and as repairing concrete mortar, as it is described in the bibliography. However, it is also possible formulate those cements using low grade magnesium oxides, which cost are nearly 10 or 15 times cheaper than those of high grade. The aim of this work is to evaluate the possibility of using low grade magnesium oxides (˜70% MgO), obtained from the calcinations process of natural magnesites, for KMgPO4•6H2O cement casting. The research and selection of the best formulation for obtaining that cement will be done also from the point of view of their mechanical properties as for their setting time.

  • New formulations to obtain fire resistant mortars

     Haurie Ibarra, Laia; Formosa Mitjans, Joan; Chimenos Ribera, Josep Maria; Rosell Amigo, Juan Ramon; Lacasta Palacio, Ana Maria
    Materiais 2007 - Global Materials for the XXI century
    Presentation of work at congresses

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  • ORDEN, RUIDO Y DINÁMICAS EMERGENTES BAJO NOLINEALIDADES

     Ramirez de La Piscina Millan, Laureano; Peñaranda Ayllon, Angelina; Haurie Ibarra, Laia; Meca Alvarez, Esteban; Rodriguez Cantalapiedra, Inmaculada; Lacasta Palacio, Ana Maria; Benitez Iglesias, Raul; Formosa Mitjans, Joan; Gonzalez Cinca, Ricardo; Suñol Galofre, Francesc Xavier; Arias Calderón, Santiago
    Participation in a competitive project

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  • Evaluación de un hidróxido de magnesio de baja ley como retardante de llama en EVA

     Fernández, Ana Inés; Haurie Ibarra, Laia; Formosa Mitjans, Joan; Chimenos Ribera, Josep Maria; Velasco Perero, Jose Ignacio; de Sousa Pais Antunes, Marcelo; Espiell Álvarez, Ferran
    Congreso Nacional de Materiales
    Presentation's date: 2006
    Presentation of work at congresses

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  • Morteros resistentes al fuego

     Chimenos Ribera, Josep Maria; Formosa Mitjans, Joan; Fernández, A I; Haurie Ibarra, Laia; Rosell Amigo, Juan Ramon; Lacasta Palacio, Ana Maria
    Congreso Nacional de Materiales
    Presentation of work at congresses

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  • Evaluación de un hidróxido de magnesio de baja ley como retardante de llama en EVA

     Fernández, A; Haurie Ibarra, Laia; Formosa Mitjans, Joan; Chimenos Ribera, Josep Maria; Velasco Perero, Jose Ignacio; Antunes, M; Espiell Álvarez, Ferran
    Congreso Nacional de Materiales
    Presentation of work at congresses

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