http://hdl.handle.net/2117/3535 Mon, 20 May 2013 16:34:05 GMT 2013-05-20T16:34:05Z webmaster.bupc@upc.edu Universitat Politècnica de Catalunya. Servei de Biblioteques i Documentació no http://hdl.handle.net/2117/19197 Title: Reactions of fly ash with calcium aluminate cement and calcium sulphate Authors: Fernández Carrasco, Lucía; Vázquez Ramonich, Enric Abstract: The hydration processes in the ternary system fly ash/calcium aluminate cement/calcium sulphate (FA/CAC/C$) at 20 °C were investigated; six compositions from the ternary system FA/CAC/C$ were selected for this study. The nature of the reaction products in these pastes were analysed by X-ray diffraction (XRD) and infrared spectroscopy (FTIR). At four days reaction time, the main hydration reaction product in these pastes was ettringite and the samples with major initial CAC presented minor ettringite but calcium aluminates hydrates. The amount of ettringite developed in the systems has no direct relation with the initial components. Tue, 14 May 2013 10:28:31 GMT http://hdl.handle.net/2117/19197 2013-05-14T10:28:31Z Fernández Carrasco, Lucía; Vázquez Ramonich, Enric no The hydration processes in the ternary system fly ash/calcium aluminate cement/calcium sulphate (FA/CAC/C$) at 20 °C were investigated; six compositions from the ternary system FA/CAC/C$ were selected for this study. The nature of the reaction products in these pastes were analysed by X-ray diffraction (XRD) and infrared spectroscopy (FTIR). At four days reaction time, the main hydration reaction product in these pastes was ettringite and the samples with major initial CAC presented minor ettringite but calcium aluminates hydrates. The amount of ettringite developed in the systems has no direct relation with the initial components. http://hdl.handle.net/2117/19189 Title: Supercritical Carbonation of Calcium Aluminate Cement Authors: Fernández Carrasco, Lucía; Miravitlles, C; Rius, J. Abstract: The microstructural changes occurring during supercritical carbonation (scCO2) of calcium aluminate cement (CAC) and changes to its strength have been investigated. Cylindrical specimens of CAC cured at different temperatures were prepared and then subjected to scCO2. It is shown that CAC carbonation in supercritical conditions is accelerated with a positive effect on the compressive strength. Due to the scCO2 treatment, both conversion and alkaline hydrolysis are avoided. The best behaviour of the studied specimens was attained for samples cured at 25 °C. The residual compounds after the scCO2 process, i.e. monocalcium aluminate, calcium carbonate and aluminium hydroxide are durable in normal ambient conditions. Complete carbonation of CAC is particularly important for the reinforcement of CAC with polymer fibres to improve its mechanical strength. Tue, 14 May 2013 07:52:00 GMT http://hdl.handle.net/2117/19189 2013-05-14T07:52:00Z Fernández Carrasco, Lucía; Miravitlles, C; Rius, J. no The microstructural changes occurring during supercritical carbonation (scCO2) of calcium aluminate cement (CAC) and changes to its strength have been investigated. Cylindrical specimens of CAC cured at different temperatures were prepared and then subjected to scCO2. It is shown that CAC carbonation in supercritical conditions is accelerated with a positive effect on the compressive strength. Due to the scCO2 treatment, both conversion and alkaline hydrolysis are avoided. The best behaviour of the studied specimens was attained for samples cured at 25 °C. The residual compounds after the scCO2 process, i.e. monocalcium aluminate, calcium carbonate and aluminium hydroxide are durable in normal ambient conditions. Complete carbonation of CAC is particularly important for the reinforcement of CAC with polymer fibres to improve its mechanical strength. http://hdl.handle.net/2117/18965 Title: Procesos de activación alcalino-sulfáticos de una escoria española de alto horno Authors: Fernández Jiménez, Ana; Puertas Maroto, Francisca; Fernández Carrasco, Lucía Abstract: Se han estudiado los procesos de activación alcalinosulfáticos de una escoria granulada de alto horno española (Avilés, Ensidesa). Las disoluciones activantes utilizadas fueron: H2O desionizada (como disolución de referencia), Ca(OH)2 (3,5∙10-3N), NaOH (1N), Na2CO3 (2N), CaSO4∙2H2O (3,0∙10-3N) a 25ºC. Se ha comprobado la influencia de la naturaleza del catión de la disolución alcalina o sulfática sobre el proceso de activación de la escoria. Las disoluciones sódicas disminuyen el período de inducción, mientras que las disoluciones cálcicas lo incrementan. También se determinó el grado de reacción de la escoria, así como la naturaleza de los distintos productos de reacción formados, en función de la naturaleza de la disolución activante. Tue, 23 Apr 2013 13:55:18 GMT http://hdl.handle.net/2117/18965 2013-04-23T13:55:18Z Fernández Jiménez, Ana; Puertas Maroto, Francisca; Fernández Carrasco, Lucía no Se han estudiado los procesos de activación alcalinosulfáticos de una escoria granulada de alto horno española (Avilés, Ensidesa). Las disoluciones activantes utilizadas fueron: H2O desionizada (como disolución de referencia), Ca(OH)2 (3,5∙10-3N), NaOH (1N), Na2CO3 (2N), CaSO4∙2H2O (3,0∙10-3N) a 25ºC. Se ha comprobado la influencia de la naturaleza del catión de la disolución alcalina o sulfática sobre el proceso de activación de la escoria. Las disoluciones sódicas disminuyen el período de inducción, mientras que las disoluciones cálcicas lo incrementan. También se determinó el grado de reacción de la escoria, así como la naturaleza de los distintos productos de reacción formados, en función de la naturaleza de la disolución activante. http://hdl.handle.net/2117/18964 Title: Aplicación de la espectroscopia infrarroja al estudio de cemento aluminoso Authors: Fernández Carrasco, Lucía; Vázquez Moreno, Tomás Abstract: Se han estudiado los componentes mineralógicos del cemento aluminoso hidratado a través de la técnica de espectroscopia de absorción infrarroja. Se ha realizado, también con esta técnica, un análisis de las muestras que se han obtenido de viguetas que fueron fabricadas con hormigón aluminoso. Se destaca la importancia de esta técnica como complementaria de otras más habitualmente utilizadas en la caracterización de estos compuestos. Tue, 23 Apr 2013 13:35:39 GMT http://hdl.handle.net/2117/18964 2013-04-23T13:35:39Z Fernández Carrasco, Lucía; Vázquez Moreno, Tomás no Se han estudiado los componentes mineralógicos del cemento aluminoso hidratado a través de la técnica de espectroscopia de absorción infrarroja. Se ha realizado, también con esta técnica, un análisis de las muestras que se han obtenido de viguetas que fueron fabricadas con hormigón aluminoso. Se destaca la importancia de esta técnica como complementaria de otras más habitualmente utilizadas en la caracterización de estos compuestos. http://hdl.handle.net/2117/18716 Title: Diseño de mezclas de hormigón reciclado mediante el método Volumen de Mortero Equivalente (EMV): Validación bajo el contexto español y su adaptación al método de diseño de Bolomey Authors: Jiménez Fernández, Cristian Gonzalo; Vázquez Ramonich, Enric; Barra Bizinotto, Marilda; Valls del Barrio, Susanna Abstract: El nuevo método para el diseño de hormigón con árido reciclado (HAR) es usado para comprobar su posibilidad de uso bajo el contexto español. Primeramente, se realiza una extensa campaña experimental, para analizar las posibilidades de su aplicación, usando dos áridos reciclados de hormigón (ARH) españoles. En la segunda etapa se elabora una adaptación del método a la metodología propuesta por Bolomey (1), con 20% de reemplazo en peso de árido grueso natural (AN) por ARH, para así cumplir con las recomendaciones estipuladas en la Instrucción de Hormigón Estructural (EHE 2008). Para determinar y analizar las propiedades del hormigón, se llevaron a cabo ensayos de asentamiento, contenido de aire, densidades, módulo elástico y resistencias a compresión. Finalmente, se concluye que el uso del nuevo método es viable, y que su adaptación produce hormigones con similares o mejores características que los elaborados para hormigón con árido convencional (HAC) y HAR convencionales. Tue, 09 Apr 2013 08:52:09 GMT http://hdl.handle.net/2117/18716 2013-04-09T08:52:09Z Jiménez Fernández, Cristian Gonzalo; Vázquez Ramonich, Enric; Barra Bizinotto, Marilda; Valls del Barrio, Susanna no El nuevo método para el diseño de hormigón con árido reciclado (HAR) es usado para comprobar su posibilidad de uso bajo el contexto español. Primeramente, se realiza una extensa campaña experimental, para analizar las posibilidades de su aplicación, usando dos áridos reciclados de hormigón (ARH) españoles. En la segunda etapa se elabora una adaptación del método a la metodología propuesta por Bolomey (1), con 20% de reemplazo en peso de árido grueso natural (AN) por ARH, para así cumplir con las recomendaciones estipuladas en la Instrucción de Hormigón Estructural (EHE 2008). Para determinar y analizar las propiedades del hormigón, se llevaron a cabo ensayos de asentamiento, contenido de aire, densidades, módulo elástico y resistencias a compresión. Finalmente, se concluye que el uso del nuevo método es viable, y que su adaptación produce hormigones con similares o mejores características que los elaborados para hormigón con árido convencional (HAC) y HAR convencionales. http://hdl.handle.net/2117/17548 Title: Expansion of mortars with gypsum contaminated fine recycled aggregates Authors: Tovar Rodríguez, Gustavo Enrique; Barra Bizinotto, Marilda; Pialarissi Cavalaro, Sergio Henr; Aponte Hernández, Diego Fernando; Vázquez Ramonich, Enric Abstract: This study evaluates the expansivity of fine recycled aggregates mortars depending on the type of Portland cement, the consistency and the equivalent of acid soluble sulphates (SO3) content. For that, an experimental campaign divided in two phases was performed. In the first phase, the cement pastes were produced and tested by means of X-rays diffractions in order to analyze the hydrated compounds formed over time. In the second phase mortars samples were cast in order to assess the physical and mechanical properties as well as the expansion over time. The results showed that incorporation of gypsum contaminated fine recycled aggregates with SO3 contents up to 2.9% by weight does not compromise the durability in mortars, regardless of the cement types studied in this study, the consistency and the contaminant present. Thu, 31 Jan 2013 14:21:52 GMT http://hdl.handle.net/2117/17548 2013-01-31T14:21:52Z Tovar Rodríguez, Gustavo Enrique; Barra Bizinotto, Marilda; Pialarissi Cavalaro, Sergio Henr; Aponte Hernández, Diego Fernando; Vázquez Ramonich, Enric no This study evaluates the expansivity of fine recycled aggregates mortars depending on the type of Portland cement, the consistency and the equivalent of acid soluble sulphates (SO3) content. For that, an experimental campaign divided in two phases was performed. In the first phase, the cement pastes were produced and tested by means of X-rays diffractions in order to analyze the hydrated compounds formed over time. In the second phase mortars samples were cast in order to assess the physical and mechanical properties as well as the expansion over time. The results showed that incorporation of gypsum contaminated fine recycled aggregates with SO3 contents up to 2.9% by weight does not compromise the durability in mortars, regardless of the cement types studied in this study, the consistency and the contaminant present. http://hdl.handle.net/2117/16706 Title: Dredged marine sand as construction material Authors: Limeira de Araujo, Jussara; Agulló Fité, Luís; Etxeberria Larrañaga, Miren Abstract: This work deals with the study of dredged marine sand (DMS) from the Port of Sant Carles de la Ràpita (Tarragona, Spain) as construction material. The analysis of its influence on paste, mortar and concrete production is described. Two experimental phases were carried out after the chemical and physical characteristics of DMS were determined. Firstly, pastes and mortars were made using CEM II/A-M 42.5R cement, different percentages of DMS in replacement of raw sand and plasticizer additive in order to obtain the fresh and hardened properties of the mixes studied. After that, DMS was used for the production of concretes as fine aggregates. A pilot study was carried out with harbor concrete pavements produced at industrial scale. The results were compared to those of the control mixes and proved the satisfactory behavior of DMS as construction material when incorporated into concrete as granular corrector. Wed, 10 Oct 2012 13:06:58 GMT http://hdl.handle.net/2117/16706 2012-10-10T13:06:58Z Limeira de Araujo, Jussara; Agulló Fité, Luís; Etxeberria Larrañaga, Miren no dredged marine sand, mortar, concrete, mechanical properties This work deals with the study of dredged marine sand (DMS) from the Port of Sant Carles de la Ràpita (Tarragona, Spain) as construction material. The analysis of its influence on paste, mortar and concrete production is described. Two experimental phases were carried out after the chemical and physical characteristics of DMS were determined. Firstly, pastes and mortars were made using CEM II/A-M 42.5R cement, different percentages of DMS in replacement of raw sand and plasticizer additive in order to obtain the fresh and hardened properties of the mixes studied. After that, DMS was used for the production of concretes as fine aggregates. A pilot study was carried out with harbor concrete pavements produced at industrial scale. The results were compared to those of the control mixes and proved the satisfactory behavior of DMS as construction material when incorporated into concrete as granular corrector. http://hdl.handle.net/2117/16370 Title: Evaluación del proceso de fatiga de mezclas asfálticas mediante un nuevo procedimiento cíclico de barrido de deformaciones: EBADE Authors: Pérez Jiménez, Félix Edmundo; Valdés, G.; Botella Nieto, Ramón; Miró Recasens, José Rodrigo; Martínez Reguero, Adriana Haydée Abstract: This paper presents a new experimental procedure to characterize fatigue behaviour of asphalt mixtures, called EBADE procedure. It has been developed at the Road Research Laboratory based in the Technical University of Catalonia (UPC-Barcelona Tech). The procedure consists of applying cyclic tension-compression loads in a displacement-controlled uniaxial test at different strain levels. By doing so it is possible to obtain two key strain values in the characterization of asphalt mixtures fatigue behaviour. Those are the strain level at which the mixture does not undergo fatigue (endurance limit) and the strain level at which critical fatigue failure takes place. In addition, EBADE procedure allows one to emulate the fatigue process a pavement goes through when it has to sustain thermal stresses. In this paper the EBADE procedure is detailed, and the main results and conclusions obtained in the experimental study carried out in order to evaluate its sensitivity are exposed. En este artículo se presenta un nuevo procedimiento experimental, de rápida ejecución, para caracterizar la respuesta al fallo por fatiga de las mezclas asfálticas, el procedimiento EBADE. Su desarrollo se ha realizado en el Laboratorio de Caminos de la Universidad Politécnica de Cataluña, y su metodología consiste en aplicar a probetas prismáticas de mezcla asfáltica series de ciclos de carga de tensión-compresión a distintos niveles de deformación, los cuales aumentan gradualmente hasta producir el fallo por fatiga de la mezcla. Este procedimiento permite caracterizar las mezclas asfálticas por medio de la obtención de los dos niveles de deformación relacionados directamente con el comportamiento a fatiga de las mezclas: el nivel de deformación debajo del cual la mezcla asfáltica no sufre deterioro y el nivel de deformación en el que tiene lugar la rápida propagación del fallo por fatiga. A su vez, el procedimiento EBADE permite simular el proceso de fatiga de las mezclas asfálticas cuando estas están bajo estados tensionales producto de las variaciones térmicas. En este trabajo de investigación se da a conocer, tanto la metodología del procedimiento EBADE, como los resultados y principales conclusiones del estudio experimental llevado a cabo para demostrar la sensibilidad y ventajas del procedimiento propuesto. Mon, 30 Jul 2012 10:26:01 GMT http://hdl.handle.net/2117/16370 2012-07-30T10:26:01Z Pérez Jiménez, Félix Edmundo; Valdés, G.; Botella Nieto, Ramón; Miró Recasens, José Rodrigo; Martínez Reguero, Adriana Haydée no Asphalt mixtures, fatigue, cracking This paper presents a new experimental procedure to characterize fatigue behaviour of asphalt mixtures, called EBADE procedure. It has been developed at the Road Research Laboratory based in the Technical University of Catalonia (UPC-Barcelona Tech). The procedure consists of applying cyclic tension-compression loads in a displacement-controlled uniaxial test at different strain levels. By doing so it is possible to obtain two key strain values in the characterization of asphalt mixtures fatigue behaviour. Those are the strain level at which the mixture does not undergo fatigue (endurance limit) and the strain level at which critical fatigue failure takes place. In addition, EBADE procedure allows one to emulate the fatigue process a pavement goes through when it has to sustain thermal stresses. In this paper the EBADE procedure is detailed, and the main results and conclusions obtained in the experimental study carried out in order to evaluate its sensitivity are exposed. En este artículo se presenta un nuevo procedimiento experimental, de rápida ejecución, para caracterizar la respuesta al fallo por fatiga de las mezclas asfálticas, el procedimiento EBADE. Su desarrollo se ha realizado en el Laboratorio de Caminos de la Universidad Politécnica de Cataluña, y su metodología consiste en aplicar a probetas prismáticas de mezcla asfáltica series de ciclos de carga de tensión-compresión a distintos niveles de deformación, los cuales aumentan gradualmente hasta producir el fallo por fatiga de la mezcla. Este procedimiento permite caracterizar las mezclas asfálticas por medio de la obtención de los dos niveles de deformación relacionados directamente con el comportamiento a fatiga de las mezclas: el nivel de deformación debajo del cual la mezcla asfáltica no sufre deterioro y el nivel de deformación en el que tiene lugar la rápida propagación del fallo por fatiga. A su vez, el procedimiento EBADE permite simular el proceso de fatiga de las mezclas asfálticas cuando estas están bajo estados tensionales producto de las variaciones térmicas. En este trabajo de investigación se da a conocer, tanto la metodología del procedimiento EBADE, como los resultados y principales conclusiones del estudio experimental llevado a cabo para demostrar la sensibilidad y ventajas del procedimiento propuesto. http://hdl.handle.net/2117/15751 Title: Arenas de dragado marino como nueva fuente para materiales de construcción Authors: Limeira de Araujo, Jussara; Agulló Fité, Luís; Etxeberria Larrañaga, Miren Abstract: Este trabajo propone el uso de arenas de dragado marino (DMS) en pastas y morteros como material constructivo. Se utilizaron materiales de dos puertos españoles: DMS-0 del puerto de Sant Carles de la Ràpita, y DMS-A,DMS-B y DMS-C del puerto de Barcelona. El objetivo del estudio era evaluar el material DMS como adición (influencia sobre cohesión y fluidez) o como corrector granular (influencia sobre resistencia a la compresión) en diferentes mezclas de pasta y morteros de cemento, respectivamente. Se realizaron dos fases experimentales: primero, se empleó el DMS-0 en la producción de pastas y morteros (sustitución parcial de arena natural 0/2 mm); a continuación, se emplearon DMS-A, DMS-B y DMS-C en la producción de morteros (sustitución parcial de arena natural 0/5 mm). Los resultados obtenidos fueron comparados con las mezclas de control y revelaron que la proporción óptima de sustitución de arenas naturales por DMS era del 25%. // This work deals with the use of dredged marine sand (DMS) in pastes and mortars as construction material. Different materials from two Spanish ports were used: DMS-0 from Sant Carles de la Ràpita and DMS-A, DMS-B and DMS-C from Barcelona. The aim of the study was to assess DMS as addition (its influence on cohesion and fluidity) or as a fine granular corrector (its influence on compressive strength) in different mixes of cement paste and mortars, respectively. Two experimental stages were carried out: firstly, DMS-0 material was used on the production of pastes and mortars (partial substitution of raw sand 0/2 mm); secondly, DMS-A, DMS-B and DMSC were used on mortar production (partial substitution of raw sand 0/5 mm). The fresh and hardened properties obtained were compared to those of the control mixes; the results revealed 25% as an optimum substitution ratio of raw sands for DMS. Mon, 23 Apr 2012 08:49:11 GMT http://hdl.handle.net/2117/15751 2012-04-23T08:49:11Z Limeira de Araujo, Jussara; Agulló Fité, Luís; Etxeberria Larrañaga, Miren no Este trabajo propone el uso de arenas de dragado marino (DMS) en pastas y morteros como material constructivo. Se utilizaron materiales de dos puertos españoles: DMS-0 del puerto de Sant Carles de la Ràpita, y DMS-A,DMS-B y DMS-C del puerto de Barcelona. El objetivo del estudio era evaluar el material DMS como adición (influencia sobre cohesión y fluidez) o como corrector granular (influencia sobre resistencia a la compresión) en diferentes mezclas de pasta y morteros de cemento, respectivamente. Se realizaron dos fases experimentales: primero, se empleó el DMS-0 en la producción de pastas y morteros (sustitución parcial de arena natural 0/2 mm); a continuación, se emplearon DMS-A, DMS-B y DMS-C en la producción de morteros (sustitución parcial de arena natural 0/5 mm). Los resultados obtenidos fueron comparados con las mezclas de control y revelaron que la proporción óptima de sustitución de arenas naturales por DMS era del 25%. // This work deals with the use of dredged marine sand (DMS) in pastes and mortars as construction material. Different materials from two Spanish ports were used: DMS-0 from Sant Carles de la Ràpita and DMS-A, DMS-B and DMS-C from Barcelona. The aim of the study was to assess DMS as addition (its influence on cohesion and fluidity) or as a fine granular corrector (its influence on compressive strength) in different mixes of cement paste and mortars, respectively. Two experimental stages were carried out: firstly, DMS-0 material was used on the production of pastes and mortars (partial substitution of raw sand 0/2 mm); secondly, DMS-A, DMS-B and DMSC were used on mortar production (partial substitution of raw sand 0/5 mm). The fresh and hardened properties obtained were compared to those of the control mixes; the results revealed 25% as an optimum substitution ratio of raw sands for DMS. http://hdl.handle.net/2117/13653 Title: Dones i ciència. La transversalitat de gènere en el marc de la recerca europea Authors: Pardo Tràfach, Patricia; Burgues, Ana; García, Carmen Tue, 25 Oct 2011 10:21:30 GMT http://hdl.handle.net/2117/13653 2011-10-25T10:21:30Z Pardo Tràfach, Patricia; Burgues, Ana; García, Carmen no http://hdl.handle.net/2117/13313 Title: Mechanical and durability properties of concrete made with dredged marine sand Authors: Limeira de Araujo, Jussara; Etxeberria Larrañaga, Miren; Agulló Fité, Luís; Molina, Daniel Abstract: The process of depletion of sources of natural aggregates challenges the production of technically and environmentally adequate concrete. Alternative material from marine sources, especially for concrete maritime structures, could represent an acceptable solution for this problem and it might also be of great interest for port management. This research work describes the study of the mechanical and durability properties of concretes fabricated with dredged marine sand (DMS) as a fine granular corrector in partial substitution of raw sand (from 15% to up to 50% by raw sand mass) designed for harbor pavements. Three DMS samples were extracted from the Port of Barcelona. The material was stockpiled in the open air and no washing, drying or decontamination process was carried out. Mineralogical, physical and chemical properties of DMS material were determined. Eight different mixtures were produced incorporating three types of DMS material as granular corrector in partial substitution of crushed limestone raw sand. The concretes were submitted to compressive strength tests after 7 and 28 days of moist curing, as well as density, absorption, accessible pores, elastic modulus, tensile and splitting tensile strength, abrasion, capillary suction, water penetration under pressure and ultrasonic pulse velocity (UPV) tests, all of them after 28 days of moist curing. This study shows that dredged marine sand can be successfully used as a fine aggregate for concrete production. This is justified by the similar physical and mechanical properties of concrete made with DMS comparing to reference concrete. It was verified that the use of DMS in substitution of raw sand maintained or reduced the accessible pores, the sorptivity and the water penetration depth under pressure. Fri, 23 Sep 2011 11:10:17 GMT http://hdl.handle.net/2117/13313 2011-09-23T11:10:17Z Limeira de Araujo, Jussara; Etxeberria Larrañaga, Miren; Agulló Fité, Luís; Molina, Daniel no The process of depletion of sources of natural aggregates challenges the production of technically and environmentally adequate concrete. Alternative material from marine sources, especially for concrete maritime structures, could represent an acceptable solution for this problem and it might also be of great interest for port management. This research work describes the study of the mechanical and durability properties of concretes fabricated with dredged marine sand (DMS) as a fine granular corrector in partial substitution of raw sand (from 15% to up to 50% by raw sand mass) designed for harbor pavements. Three DMS samples were extracted from the Port of Barcelona. The material was stockpiled in the open air and no washing, drying or decontamination process was carried out. Mineralogical, physical and chemical properties of DMS material were determined. Eight different mixtures were produced incorporating three types of DMS material as granular corrector in partial substitution of crushed limestone raw sand. The concretes were submitted to compressive strength tests after 7 and 28 days of moist curing, as well as density, absorption, accessible pores, elastic modulus, tensile and splitting tensile strength, abrasion, capillary suction, water penetration under pressure and ultrasonic pulse velocity (UPV) tests, all of them after 28 days of moist curing. This study shows that dredged marine sand can be successfully used as a fine aggregate for concrete production. This is justified by the similar physical and mechanical properties of concrete made with DMS comparing to reference concrete. It was verified that the use of DMS in substitution of raw sand maintained or reduced the accessible pores, the sorptivity and the water penetration depth under pressure. http://hdl.handle.net/2117/13236 Title: Procedural uncertainties of Proctor compaction tests applied on MSWI bottom ash Authors: Izquierdo, Maria; Querol, Xavier; Vázquez Ramonich, Enric Abstract: MSWI bottom ash is a well-graded highly compactable material that can be used as a road material in unbound pavements. Achieving the compactness assumed in the design of the pavement is of primary concern to ensure long term structural stability. Regulations on road construction in a number of EU countries rely on standard tests originally developed for natural aggregates, which may not be appropriate to accurately assess MSWI bottom ash. This study is intended to assist in consistently assessing MSWI bottom ash compaction by means of the Proctor method. This test is routinely applied to address unbound road materials and suggests two methods. Compaction parameters show a marked procedural dependency due to the particle morphology and weak particle strength of ash. Re-compacting a single batch sample to determine Proctor curves is a common practise that turns out to overvalue optimum moisture contents and maximum dry densities. This could result in wet-side compactions not meeting stiffness requirements. Inaccurate moisture content measurements during testing may also induce erroneous determinations of compaction parameters. The role of a number of physical properties of MSWI bottom ash in compaction is also investigated. Mon, 19 Sep 2011 10:37:16 GMT http://hdl.handle.net/2117/13236 2011-09-19T10:37:16Z Izquierdo, Maria; Querol, Xavier; Vázquez Ramonich, Enric no MSWI bottom ash is a well-graded highly compactable material that can be used as a road material in unbound pavements. Achieving the compactness assumed in the design of the pavement is of primary concern to ensure long term structural stability. Regulations on road construction in a number of EU countries rely on standard tests originally developed for natural aggregates, which may not be appropriate to accurately assess MSWI bottom ash. This study is intended to assist in consistently assessing MSWI bottom ash compaction by means of the Proctor method. This test is routinely applied to address unbound road materials and suggests two methods. Compaction parameters show a marked procedural dependency due to the particle morphology and weak particle strength of ash. Re-compacting a single batch sample to determine Proctor curves is a common practise that turns out to overvalue optimum moisture contents and maximum dry densities. This could result in wet-side compactions not meeting stiffness requirements. Inaccurate moisture content measurements during testing may also induce erroneous determinations of compaction parameters. The role of a number of physical properties of MSWI bottom ash in compaction is also investigated. http://hdl.handle.net/2117/12738 Title: Estado de la resistencia a la fisuración de las mezclas bituminosas: ensayos Fénix y EBADE Authors: Pérez Jiménez, Félix Edmundo; Miró Recasens, José Rodrigo; Martínez Reguero, Adriana Haydée; Botella Nieto, Ramón; Valdés Vidal, Gonzalo A. Abstract: Este artículo propone el empleo de dos ensayos desarrollados por el Laboratorio de Caminos de la Universidad Politécnica de Cataluña, uno estático de tracción (ensayo Fénix) y otro cíclico de tracción-compresión (ensayo EBADE), para evaluar la resistencia a la fisuración de las mezclas bituminosas, su variación con la temperatura y su comportamiento a fatiga. El ensayo Fénix se ha mostrado como un método válido para evaluar la resistencia a la fisuración a diferentes temperaturas. Así mismo, permite estimar el comportamiento a fatiga de las mezclas bituminosas. El procedimiento EBADE de barrido de deformaciones se ha mostrado suficientemente sensible para evaluar el comportamiento a fatiga de mezclas rígidas y mezclas más dúctiles, y ha sido capaz de evaluar la influencia de las tensiones térmicas en la vida a fatiga de la mezcla. Wed, 08 Jun 2011 12:41:08 GMT http://hdl.handle.net/2117/12738 2011-06-08T12:41:08Z Pérez Jiménez, Félix Edmundo; Miró Recasens, José Rodrigo; Martínez Reguero, Adriana Haydée; Botella Nieto, Ramón; Valdés Vidal, Gonzalo A. no fatigue, Fenix test, strain sweep, thermal stress, Energía de fractura, ensayo Fénix, barrido de deformaciones, tensiones térmicas, fatiga, Fracture energy Este artículo propone el empleo de dos ensayos desarrollados por el Laboratorio de Caminos de la Universidad Politécnica de Cataluña, uno estático de tracción (ensayo Fénix) y otro cíclico de tracción-compresión (ensayo EBADE), para evaluar la resistencia a la fisuración de las mezclas bituminosas, su variación con la temperatura y su comportamiento a fatiga. El ensayo Fénix se ha mostrado como un método válido para evaluar la resistencia a la fisuración a diferentes temperaturas. Así mismo, permite estimar el comportamiento a fatiga de las mezclas bituminosas. El procedimiento EBADE de barrido de deformaciones se ha mostrado suficientemente sensible para evaluar el comportamiento a fatiga de mezclas rígidas y mezclas más dúctiles, y ha sido capaz de evaluar la influencia de las tensiones térmicas en la vida a fatiga de la mezcla. http://hdl.handle.net/2117/12165 Title: Experimental study of recycled asphalt mixtures with high percentages of reclaimed asphalt pavement (RAP) Authors: Valdés Vidal, Gonzalo A.; Pérez Jiménez, Félix Edmundo; Miró Recasens, José Rodrigo; Martínez Reguero, Adriana Haydée; Botella Nieto, Ramón Abstract: This paper presents an experimental study to characterize the mechanical behaviour of bituminous mixtures containing high rates of reclaimed asphalt pavement (RAP). Two semidense mixtures of 12 and 20 mm maximum aggregate size and containing 40 and 60% RAP, respectively (S-12 and S-20, in accordance with Spanish specifications), which were used for rehabilitation of a highway section, were evaluated. First, the effect of RAP variability on the recycled mixtures was analyzed. Their mechanical properties were then studied by determining the stiffness modulus and indirect tensile strength and cracking and fatigue behaviour. Results show that high rates of recycled material can generally be incorporated into bituminous mixes by proper characterization and handling of RAP stockpiles. Tue, 29 Mar 2011 17:34:27 GMT http://hdl.handle.net/2117/12165 2011-03-29T17:34:27Z Valdés Vidal, Gonzalo A.; Pérez Jiménez, Félix Edmundo; Miró Recasens, José Rodrigo; Martínez Reguero, Adriana Haydée; Botella Nieto, Ramón no Asphalt mixture, Hot recycling, Reclaimed asphalt pavement, Variability analysis This paper presents an experimental study to characterize the mechanical behaviour of bituminous mixtures containing high rates of reclaimed asphalt pavement (RAP). Two semidense mixtures of 12 and 20 mm maximum aggregate size and containing 40 and 60% RAP, respectively (S-12 and S-20, in accordance with Spanish specifications), which were used for rehabilitation of a highway section, were evaluated. First, the effect of RAP variability on the recycled mixtures was analyzed. Their mechanical properties were then studied by determining the stiffness modulus and indirect tensile strength and cracking and fatigue behaviour. Results show that high rates of recycled material can generally be incorporated into bituminous mixes by proper characterization and handling of RAP stockpiles. http://hdl.handle.net/2117/11936 Title: Fénix test: development of a new test procedure for evaluating cracking resistance in bituminous mixtures Authors: Pérez Jiménez, Félix Edmundo; Valdés Vidal, Gonzalo A.; Miró Recasens, José Rodrigo; Martínez Reguero, Adriana Haydée; Botella Nieto, Ramón Abstract: This paper presents a new direct tensile test to evaluate cracking resistance of asphalt concrete mixtures called Fénix test. First, the literature on cracking factors and mechanisms of bituminous mixtures as well as current tests to measure cracking properties are reviewed. Next, the Fénix test is described and some initial experimental results of the influence of variables such as binder type and content and test temperature are provided. Additionally, test repeatability and sensitivity are statistically analyzed. Correlations between parameters obtained by the Fénix test and the three-point bending beam fatigue test are also shown. Finally, the main conclusions of this work are summarized. These conclusions confirm that the Fénix test is a practical and efficient method for characterizing cracking behaviour of asphalt concrete mixtures as far as the studied variables are concerned. Thu, 17 Mar 2011 19:44:47 GMT http://hdl.handle.net/2117/11936 2011-03-17T19:44:47Z Pérez Jiménez, Félix Edmundo; Valdés Vidal, Gonzalo A.; Miró Recasens, José Rodrigo; Martínez Reguero, Adriana Haydée; Botella Nieto, Ramón no Sensitivity analysis, Temperature, Test procedures, Tension tests, Cracking resistance, Fatigue tests, Repeatability, Asphalt concrete, Binder content, Bituminous binders, Bituminous mixtures, Correlation analysis, Cracking This paper presents a new direct tensile test to evaluate cracking resistance of asphalt concrete mixtures called Fénix test. First, the literature on cracking factors and mechanisms of bituminous mixtures as well as current tests to measure cracking properties are reviewed. Next, the Fénix test is described and some initial experimental results of the influence of variables such as binder type and content and test temperature are provided. Additionally, test repeatability and sensitivity are statistically analyzed. Correlations between parameters obtained by the Fénix test and the three-point bending beam fatigue test are also shown. Finally, the main conclusions of this work are summarized. These conclusions confirm that the Fénix test is a practical and efficient method for characterizing cracking behaviour of asphalt concrete mixtures as far as the studied variables are concerned.