141.
Radial stress paths in triaxial tests on compacted Boom clay: stiffness and anisotropy
- Della Vecchia, G.; Jommi, Cristina; Romero Morales, Enrique Edgar
Experimental results of triaxial tests performed on unsaturated soil samples of statically compacted Boom clay are presented. Boom clay samples we re subjected to radial stress paths at two different constant water contents: w= 15%, the as-compacted one, and w= 18%, achieved by vapour transfer technique from the as-compacted condition. The dependence of volumetric compliance on the stress ratio and
on the water content is evidenced. The results of the experimental investigation are interpreted in terms of anisotropy of the mechanical response, as a consequence of the induced anisotropy during static compaction, and in terms of the dependence of the compressibility...
142.
Air injection experiments on Opalinus clay: experimental techniques, results and analyses
- Romero Morales, Enrique Edgar; Marschall, P
143.
Microstructural aspects of compacted clayey soils:an experimental viewpoint
- Romero Morales, Enrique Edgar
An overview is initially presented to bring into light the important microstructural effects on different compacted clayey soil properties. Experimental data coming from microstructural studies on different compacted clayey soils with dominant bimodal pore size distribution (i.e., aggregated type
or with shielding skeleton) are analysed to provide a comprehensive picture of different phenomenological (macroscopic) features of soil behaviour. A microstructural model, already developed to take into account
microstructural aspects on water retention
curves, was used to explain hydraulic properties and their evolution along hydro-
mechanical paths. The key point of the model is the introduction of the dependence of the microvoid volume (with saturated...
144.
Modelling compacted soils
- Pinyol Puigmartí, Núria Mercè; Alonso Pérez de Agreda, Eduardo
Mechanical and hydraulic compacted soil properties for a given soil mineralogy are essentially controlled by the attained dry density, water content and microstructure. Basic compaction conditions (wet or dry of optimum, higher or lower energy of compaction) result in changes in microstructure. The paper attempts to provide
a procedure of increasing accuracy to translate compaction concepts, rooted in common practice, into a modelling framework capable of explaining the behaviour of compacted soils. The approach developed is divided into the following stages: a) The classical compaction variables are interpreted in terms of two stress-like
variables. They are regarded as the initial state for...
145.
Estudio de la aplicación de la polianilina modificada con plastificante como aditivo anticorrosivo
- Arranz Aguado, Carolina
El objetivo de este proyecto es comparar y estudiar la protección ante la corrosión dechapas metálicas de acero pintadas con una pintura de imprimación epoxi. La pintura epoxiempleada en el estudio es una formulación nueva, diseñada en nuestros laboratorios, con elúnico objetivo de sustituir los aditivos anticorrosivos inorgánicos por un polímero conductor,conocido como polianilina emeraldina base (Pani-EB). Algunos estudios previos handemostrado que este polímero es un excelente inhibidor de la corrosión y, por este motivo,uno de nuestros objetivos es emplear la polianilina como una alternativa a los aditivos opigmentos inorgánicos generalmente empleados en pinturas marinas o anticorrosivas, comopueden ser, el...
146.
Estudi del procés de fabricació de perfils conformats en fred per a portes corredores
- Redondo Cabanillas, Víctor
Aquest volum conté la memòria del Projecte de Fi de Carrera “Estudi del procés defabricació de perfils conformats en fred per a portes corredores”. El procés de fabricaciód’aquest component d’automòbil es realitza en dues etapes, un perfilat i un cintrat.L’objectiu bàsic d’aquest estudi és comprendre i millorar l’actual procés de fabricaciód’aquest component. Per això es realitza un procés de simulació de les diferents parts delprocés de fabricació.Primerament, es simula el procés de perfilat mitjançant el programa de simulació perelements finits de perfilat, COPRA®. A continuació, es crea un model a ANSYS® que permetsimular, per elements finits, el cintrat. Sobre aquest...
147.
Modelling compacted soils
- Pinyol Puigmartí, Núria Mercè; Alonso Pérez de Agreda, Eduardo
Mechanical and hydraulic compacted soil properties for a given soil mineralogy are essentially controlled by the attained dry density, water content and microstructure. Basic compaction conditions (wet or dry of optimum, higher or lower energy of compaction) result in changes in microstructure. The paper attempts to providea procedure of increasing accuracy to translate compaction concepts, rooted in common practice, into a modelling framework capable of explaining the behaviour of compacted soils. The approach developed is divided into the following stages: a) The classical compaction variables are interpreted in terms of two stress-likevariables. They are regarded as the initial state for...
148.
Rapid drawdown and landslides
- Pinyol Puigmartí, Núria Mercè; Alonso Pérez de Agreda, Eduardo; Olivella Pastallé, Sebastià
Predicting the pore pressure distribution in a slope after rapid drawdown conditions requires the solution of a coupled flow‐deformation analysis in a saturated‐unsaturated porous media. A fully coupled finite element code (Code_Bright), able to handle in a consistent manner the drawdown conditions, is used to simulate the pore water pressure measured in the upstream slope of an earth dam (Glen Shira Dam, Scotland) subjected to a controlled rapiddrawdown event. A comparison of some calculation alternatives is then given and compared with field pressure records. The paper describes also the analysis performed to interpret a recent case of a major landslide...
149.
Radial stress paths in triaxial tests on compacted Boom clay: stiffness and anisotropy
- Della Vecchia, G.; Jommi, Cristina; Romero Morales, Enrique Edgar
Experimental results of triaxial tests performed on unsaturated soil samples of statically compacted Boom clay are presented. Boom clay samples we re subjected to radial stress paths at two different constant water contents: w= 15%, the as-compacted one, and w= 18%, achieved by vapour transfer technique from the as-compacted condition. The dependence of volumetric compliance on the stress ratio andon the water content is evidenced. The results of the experimental investigation are interpreted in terms of anisotropy of the mechanical response, as a consequence of the induced anisotropy during static compaction, and in terms of the dependence of the compressibility...
150.
Air injection experiments on Opalinus clay: experimental techniques, results and analyses
- Romero Morales, Enrique Edgar; Marschall, P
151.
Microstructural aspects of compacted clayey soils:an experimental viewpoint
- Romero Morales, Enrique Edgar
An overview is initially presented to bring into light the important microstructural effects on different compacted clayey soil properties. Experimental data coming from microstructural studies on different compacted clayey soils with dominant bimodal pore size distribution (i.e., aggregated typeor with shielding skeleton) are analysed to provide a comprehensive picture of different phenomenological (macroscopic) features of soil behaviour. A microstructural model, already developed to take into accountmicrostructural aspects on water retentioncurves, was used to explain hydraulic properties and their evolution along hydro-mechanical paths. The key point of the model is the introduction of the dependence of the microvoid volume (with saturated...
152.
Inmovilización de TiO2 sobre polímeros transparentes en el UV-A para la eliminación fotocatalítica de tricloroetileno en aire
- Cámara Hurtado, Rosa Mª
El gran desarrollo industrial y demográfico de las últimas décadas ha dado lugar a un consumo crecientemente insostenible de energía y materias primas, que influye negativamente en el ambiente por la gran cantidad de contaminantes generados. Entre las emisiones tienen gran importancia los compuestos orgánicos volátiles (COV), y entre ellos los compuestos halogenados como el tricloroetileno, debido a su elevada toxicidad y resistencia a la degradación. Las tecnologías generalmente empleadas para la degradación de estos compuestos presentan inconvenientes derivados de la generación de productos tóxicos intermedios o su elevado coste. Dentro de los procesos avanzados de oxidación (Advanced Oxidation Processes...
153.
Levantamento exploratório dos solos da regiao sob influência da Cia. Vale do Rio Doce.
- BRASIL. Ministerio da Agricultura. Escritorio de Pesquisas e Experimentacao. Equipe de Pedologia e Fertilidade do Solo.
Os trabalhos de levantamento dos solos da regiao sob influencia da Cia. Vale do Rio Doce tiveram inicio em julho de 1968 e terminaram em agosto de 1969. Foram executados segundo Convenio entre a Companhia Vale do Rio Doce e Equipe de Pedologia e Fertilidade do Solo do Escritorio de Pesquisas e Experimentacao do Ministerio da Agricultura. Consistiram na identificacao e delineamento ds diferentes unidades de mapeamento bem como no estudo das caracteristicas morfologicas, quimicas, fisico-mecanicas e mineralogicas de cada uma delas e suas correlacoes com vegetacao, clima, relevo e material de origem. O levantamento em questao foi executado de...
154.
Analysis of the dynamic response of pump-turbine runners. Part I: Experiment
- Presas Batlló, Alexandre; Valero Ferrando, M.del Carmen; Huang, Xingxing; Egusquiza Estévez, Eduard; Farhat, Mohamed; Avellan, François
When in operation, pump-turbine runners have to withstand large pressure pulsations generated by the rotor-stator interaction. The analysis of the dynamic behavior of these structures is necessary to avoid damage. For this analysis a realistic model of the runner is necessary. When the runner is submerged in water and inside the casing, its dynamic response is greatly affected. The added mass effects of the surrounding fluid and the proximity of the head-cover and bottom-cover may reduce the natural frequencies. The frequency reduction produced by the added mass effects and the influence of the boundary conditions has to be known for...
155.
Analysis of the dynamic response of pump-turbine runners. Part I: Experiment
- Presas Batlló, Alexandre; Valero Ferrando, M.del Carmen; Huang, Xingxing; Egusquiza Estévez, Eduard; FARHAT, MOHAMED; Avellan, François
When in operation, pump-turbine runners have to withstand large pressure pulsations generated by the rotor-stator interaction. The analysis of the dynamic behavior of these structures is necessary to avoid damage. For this analysis a realistic model of the runner is necessary. When the runner is submerged in water and inside the casing, its dynamic response is greatly affected. The added mass effects of the surrounding fluid and the proximity of the head-cover and bottom-cover may reduce the natural frequencies. The frequency reduction produced by the added mass effects and the influence of the boundary conditions has to be known for...
156.
Revestimientos Continuos Interiores de Varias Capas con Características de Barrera de Vapor e Higroscopicidad
- Mesquita, Carlos Alexandre Coutinho
El trabajo realizado ha pretendido desarrollar y caracterizar una solución de revestimiento continuo interior con características de barrera de vapor e higroscopicidad. El objetivo ha sido desarrollar una solución de revestimiento continuo interior, capaz de reducir el riesgo de condensación intersticial en los cerramientos, manteniendo la capacidad de regulación de la humedad del ambiente interior. ESTUDIO DE ANTECEDENTES 1 La condensación intersticial La condensación intersticial se produce cuando la presión de vapor sobrepasa la presión de vapor de saturación en una de las capas internas del cerramiento. El vapor de agua se transfiere de los locales de mayor presión de...
157.
Efeito do exercício aeróbio sobre as células progenitoras do endotélio
- Pereira, Sandra Marisa Pinto
O músculo esquelético é um órgão ditado de uma extraordinária dinâmica seja em termos fisiológicos, bioquímicos, mecânicos e mesmo endócrinos. Devendo-se à sua arquitetura anatomofisiológica a mobilidade e desempenho motor eficiente.
O ajuste funcional entre todas as estruturas determinam que o músculo exiba toda a sua operacionalidade e quando sujeito a exercício físico aeróbio, as fibras, dado a sua plasticidade, podem sofrer uma modulação no sentido do aumento das fibras do tipo I. Em todo este processo que envolve necessariamente aumentos no consumo de oxigénio e nutrientes, este aporte estará garantido se existir uma rede sanguínea eficaz, aos quais estão subjacentes...
158.
Mobility and interaction of heavy metals in a natural soil
- Bianchi Janetti, Emanuela; Dror,Ishai; Riva, Monica; Guadagnini, Alberto; Sánchez Vila, Francisco Javier; Berkowitz, Brian
We study the mobility and interaction under competing conditions observed for copper (Cu2+) and zinc (Zn2+) ions in the context of laboratory-scale experiments performed
in natural soil columns. The experiments focus on the analysis of solute breakthrough curves (BTCs) obtained after injection of an aqueous solution containing similar concentrations of the two metal ions into a soil column fully saturated with double deionized water. Transport of the competing ions is tested for the same soil under aerobic and anaerobic conditions. Measurements show that the species with lower affinity for the soil, Zn2+, migrates occupying all available adsorption sites, and is then...
159.
La resistencia mecánica de los áridos en la Instrucción EH-91
- Valverde Espinosa, Ignacio; López Martín, David; Sebastián Pardo, Eduardo M.
160.
El nuevo enfoque en los ensayos mecánicos de la madera aserrada para uso estructural en la normativa europea.
- Ariza López, Íñigo Antonio
