http://hdl.handle.net/2117/2364 Wed, 19 Jun 2013 10:16:34 GMT 2013-06-19T10:16:34Z webmaster.bupc@upc.edu Universitat Politècnica de Catalunya. Servei de Biblioteques i Documentació no http://hdl.handle.net/2117/19555 Title: An environmental impact causal model for improving the environmental performance of construction processes Authors: Fuertes Casals, Alba; Casals Casanova, Miquel; Gangolells Solanellas, Marta; Forcada Matheu, Núria; Macarulla Martí, Marcel; Roca Ramon, Xavier Abstract: Despite the increasing efforts made by the construction sector to reduce the environmental impact of their processes, construction sites are still a major source of pollution and adverse impacts on the environment. This paper aims to improve the understanding of construction-related environmental impacts by identifying on-site causal factors and associated immediate circumstances during construc- tion processes for residential building projects. Based on the literature and focus group fi ndings, we have developed a construction-related Environmental Impact Causal Model consisting of a process-oriented causal network of thirty-nine environmental impacts, forty- fi ve causal factors and over two hundred causal relationships. It is intended to contribute to a reduction in construction-related environmental impacts on building sites by supporting contractors and other decision-makers in the early identi fi cation of factors that are likely to lead to impacts or to exacerbate their consequences, as well as the later environmental performance evaluation and control. The causal model is validated by investigating over a hundred environmental incidents. Finally, possible methods to improve construction-related environ- mental performance are suggested. Fri, 14 Jun 2013 13:57:28 GMT http://hdl.handle.net/2117/19555 2013-06-14T13:57:28Z Fuertes Casals, Alba; Casals Casanova, Miquel; Gangolells Solanellas, Marta; Forcada Matheu, Núria; Macarulla Martí, Marcel; Roca Ramon, Xavier no Environmental impact, Construction, Construction industry, Environmental management Despite the increasing efforts made by the construction sector to reduce the environmental impact of their processes, construction sites are still a major source of pollution and adverse impacts on the environment. This paper aims to improve the understanding of construction-related environmental impacts by identifying on-site causal factors and associated immediate circumstances during construc- tion processes for residential building projects. Based on the literature and focus group fi ndings, we have developed a construction-related Environmental Impact Causal Model consisting of a process-oriented causal network of thirty-nine environmental impacts, forty- fi ve causal factors and over two hundred causal relationships. It is intended to contribute to a reduction in construction-related environmental impacts on building sites by supporting contractors and other decision-makers in the early identi fi cation of factors that are likely to lead to impacts or to exacerbate their consequences, as well as the later environmental performance evaluation and control. The causal model is validated by investigating over a hundred environmental incidents. Finally, possible methods to improve construction-related environ- mental performance are suggested. http://hdl.handle.net/2117/19443 Title: Gaudi and reinforced concrete in construction Authors: Grima Lopez, Rosa; Aguado de Cea, Antonio; Gómez Serrano, José Abstract: The first two decades of the 20th century witnessed the introduction and expansion of reinforced concrete as a building material in Spain. Few years passed between the introduction of the first patents in the most industrialized areas of the Iberian Peninsula and the subsequent generalization of the technique through scientific knowledge obtained in universities. This period coincides almost completely with the professional career of Antoni Gaudí, one of the most famous Catalan architects. This study reports that Gaudí had contact with this new material and discusses the transition he made from the traditional construction methods to the use of reinforced concrete in his later works. Placing the starting point in the relationship between Antonio Gaudí and the industrialists who built the first cement factories in Catalonia (especially Eusebi Güell), the research on the patents to which he had access are presented and the characteristics of his works with reinforced structures and materials are described. Wed, 29 May 2013 08:40:07 GMT http://hdl.handle.net/2117/19443 2013-05-29T08:40:07Z Grima Lopez, Rosa; Aguado de Cea, Antonio; Gómez Serrano, José no Antoni Gaudi, reinforced concrete, patent, Sagrada Familia, Park Guell The first two decades of the 20th century witnessed the introduction and expansion of reinforced concrete as a building material in Spain. Few years passed between the introduction of the first patents in the most industrialized areas of the Iberian Peninsula and the subsequent generalization of the technique through scientific knowledge obtained in universities. This period coincides almost completely with the professional career of Antoni Gaudí, one of the most famous Catalan architects. This study reports that Gaudí had contact with this new material and discusses the transition he made from the traditional construction methods to the use of reinforced concrete in his later works. Placing the starting point in the relationship between Antonio Gaudí and the industrialists who built the first cement factories in Catalonia (especially Eusebi Güell), the research on the patents to which he had access are presented and the characteristics of his works with reinforced structures and materials are described. http://hdl.handle.net/2117/19441 Title: Evolution of the formwork used in the temple of the Sagrada Familia Authors: Gómez Serrano, José; Espel, R; Grima, R; Burry, Mc; Aguado de Cea, Antonio Abstract: The Sagrada Família is Gaudi's unfinished work, to which he exclusively dedicated his last years of life. Even though he only got to build a small part of the total, he defined the rest through models and photographs. Gaudi's design for the inside of the Temple was based on a new geometric architecture that made extensive use of ruled surfaces (paraboloids, hyperboloids, ellipsoids), opening a new field which later architects have followed. The following article aims at showing the construction complexity of these structures, especially in relation to the set-up of their formwork. The vaults, which cover the naves at 30, 45, and 60 m heights, will be discussed. This discussion will show how the construction method, and in consequence the formwork, is adapted to the construction needs according to the geometric shape, size, position, material, and repetitions of each vault. Wed, 29 May 2013 08:29:09 GMT http://hdl.handle.net/2117/19441 2013-05-29T08:29:09Z Gómez Serrano, José; Espel, R; Grima, R; Burry, Mc; Aguado de Cea, Antonio no Gaudí, Sagrada Familia, geometric architecture, formwork, molds The Sagrada Família is Gaudi's unfinished work, to which he exclusively dedicated his last years of life. Even though he only got to build a small part of the total, he defined the rest through models and photographs. Gaudi's design for the inside of the Temple was based on a new geometric architecture that made extensive use of ruled surfaces (paraboloids, hyperboloids, ellipsoids), opening a new field which later architects have followed. The following article aims at showing the construction complexity of these structures, especially in relation to the set-up of their formwork. The vaults, which cover the naves at 30, 45, and 60 m heights, will be discussed. This discussion will show how the construction method, and in consequence the formwork, is adapted to the construction needs according to the geometric shape, size, position, material, and repetitions of each vault. 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/2117/19178 Title: Proyecto y construccion del cierre del ábside de la Sagrada Familia Authors: Buxadé, Carles; Gómez Serrano, José; Espel, Ramon; Grima, Rosa; Buxadé, Agata; Ferrando, Ramon; Aguado de Cea, Antonio Mon, 13 May 2013 11:08:52 GMT http://hdl.handle.net/2117/19178 2013-05-13T11:08:52Z Buxadé, Carles; Gómez Serrano, José; Espel, Ramon; Grima, Rosa; Buxadé, Agata; Ferrando, Ramon; Aguado de Cea, Antonio no Sagrada Familia, Gaudí, construcción, ábside, estructura y materiales http://hdl.handle.net/2117/19085 Title: A 3D temporal evolutionary numerical model of a masonry building in Barcelona subjected to tunnelling subsidence Authors: Camos Andreu, Carles; Molins i Borrell, Climent Abstract: The aim of this work is to deepen the knowledge of the numerical simulation used in the prediction of building dam age produced by tunnel ling subsidence. This paper analyzes the structural response of a one-storey building subjected to real ground movements experienced during the construction of the L9 Metro line tunnel in Barcelona, bored by a Earth Pressure Balance Machine (EPB) Tunnel Boring Machine (TBM). A 3D temporal evolutionary numerical model is used to predict the damage in the building resulting from tunnelling subsidence. The real structural damage presented is compared with the predictions of the numerical model. This last task can be done since the measures of real ground movements given by the monitoring instruments, such as retro -reflective prisms and total stations, are available for this research. Main model parameters have been determined by means of characterization experiments developed on the site and in the laboratory, thus giving a higher significance to the analysis. Thu, 02 May 2013 16:10:06 GMT http://hdl.handle.net/2117/19085 2013-05-02T16:10:06Z Camos Andreu, Carles; Molins i Borrell, Climent no Settlements, structural damage, sensitivity, tunnelling, numerical model, 3D analysis The aim of this work is to deepen the knowledge of the numerical simulation used in the prediction of building dam age produced by tunnel ling subsidence. This paper analyzes the structural response of a one-storey building subjected to real ground movements experienced during the construction of the L9 Metro line tunnel in Barcelona, bored by a Earth Pressure Balance Machine (EPB) Tunnel Boring Machine (TBM). A 3D temporal evolutionary numerical model is used to predict the damage in the building resulting from tunnelling subsidence. The real structural damage presented is compared with the predictions of the numerical model. This last task can be done since the measures of real ground movements given by the monitoring instruments, such as retro -reflective prisms and total stations, are available for this research. Main model parameters have been determined by means of characterization experiments developed on the site and in the laboratory, thus giving a higher significance to the analysis. http://hdl.handle.net/2117/19006 Title: New analytical model to generalize the Barcelona Test using axial displacement Authors: Pujadas Álvarez, Pablo; Blanco Álvarez, Ana; Pialarissi Cavalaro, Sergio Henr; Fuente Antequera, Albert de la; Aguado de Cea, Antonio Abstract: The Barcelona Test has proved to be very suitable for the systematic control of the tensile properties of Fibre Reinforced Concrete (FRC). Nevertheless, the need to measure the total circumferential opening displacement (TCOD) of the specimen entails the use of an expensive circumferential extensometer. In order to simplify the test, studies from the literature propose the use of the axial displacement of the press (δ) instead of the TCOD, obtaining empirical equations to correlate the energy estimated with both measurements. However, these equations are only valid for δ ranging from 1 to 4 mm and were adjusted based on the test results of just a few types of FRC. The verification of this formulation for other types of FRC shows an average error of 51.1%, thus limiting the simplification proposed for the test. In this paper, a new analytical model to convert the δ into the TCOD is developed and validated for a wide range of FRC. Besides being applicable to the whole range of δ, the new model provides a clear physical understanding of the main mechanism observed during the test and shows an average error of only 6.7%, making it possible to simplify the Barcelona test. Fri, 26 Apr 2013 11:30:56 GMT http://hdl.handle.net/2117/19006 2013-04-26T11:30:56Z Pujadas Álvarez, Pablo; Blanco Álvarez, Ana; Pialarissi Cavalaro, Sergio Henr; Fuente Antequera, Albert de la; Aguado de Cea, Antonio no The Barcelona Test has proved to be very suitable for the systematic control of the tensile properties of Fibre Reinforced Concrete (FRC). Nevertheless, the need to measure the total circumferential opening displacement (TCOD) of the specimen entails the use of an expensive circumferential extensometer. In order to simplify the test, studies from the literature propose the use of the axial displacement of the press (δ) instead of the TCOD, obtaining empirical equations to correlate the energy estimated with both measurements. However, these equations are only valid for δ ranging from 1 to 4 mm and were adjusted based on the test results of just a few types of FRC. The verification of this formulation for other types of FRC shows an average error of 51.1%, thus limiting the simplification proposed for the test. In this paper, a new analytical model to convert the δ into the TCOD is developed and validated for a wide range of FRC. Besides being applicable to the whole range of δ, the new model provides a clear physical understanding of the main mechanism observed during the test and shows an average error of only 6.7%, making it possible to simplify the Barcelona test. http://hdl.handle.net/2117/18970 Title: Ensayo de doble punzonamiento (ensayo Barcelona) para caracterizar el comportamiento del hormigón reforzado con fibra Authors: Aire, Carlos; Aguado de Cea, Antonio; Molins i Borrell, Climent Abstract: Tradicionalmente, para caracterizar el comportamiento del hormigón reforzado con fibra se realizan ensayos de flexotracción en vigas. Sin embargo, existen otros procedimientos que debido a la complejidad y variabilidad de sus resultados no son considerados como procedimientos sistemáticos de control. Recientemente, se desarrolló un nuevo método llamado ensayo Barcelona, como una alternativa para determinar la resistencia a tracción indirecta del hormigón reforzado con fibra. Es un ensayo de fácil ejecución mediante el cual un cilindro de 150 mm de diámetro y 150 mm de altura, se someten a ensayo de doble punzonamiento. El método permite obtener la resistencia a tracción del hormigón confinado con fibra con coeficientes de variación menor a los obtenidos por otros métodos. Este artículo presenta un estudio comparativo entre los resultados de resistencia y tenacidad aplicando el ensayo Barcelona y el de Flexotracción. Tue, 23 Apr 2013 18:30:03 GMT http://hdl.handle.net/2117/18970 2013-04-23T18:30:03Z Aire, Carlos; Aguado de Cea, Antonio; Molins i Borrell, Climent no Concreto reforzado con fibra, ensayo de doble punzonamiento, tenacidad, ensayo Barcelona Tradicionalmente, para caracterizar el comportamiento del hormigón reforzado con fibra se realizan ensayos de flexotracción en vigas. Sin embargo, existen otros procedimientos que debido a la complejidad y variabilidad de sus resultados no son considerados como procedimientos sistemáticos de control. Recientemente, se desarrolló un nuevo método llamado ensayo Barcelona, como una alternativa para determinar la resistencia a tracción indirecta del hormigón reforzado con fibra. Es un ensayo de fácil ejecución mediante el cual un cilindro de 150 mm de diámetro y 150 mm de altura, se someten a ensayo de doble punzonamiento. El método permite obtener la resistencia a tracción del hormigón confinado con fibra con coeficientes de variación menor a los obtenidos por otros métodos. Este artículo presenta un estudio comparativo entre los resultados de resistencia y tenacidad aplicando el ensayo Barcelona y el de Flexotracción. http://hdl.handle.net/2117/18957 Title: Recycling silicon solar cell waste in cement-based systems Authors: Fernández Carrasco, Lucía; Ferrer, R.; Aponte Hernández, Diego Fernando; Fernández, P. Abstract: This is a study of the recycling of crystalline solar cells by incorporating them in cement matrices. The hydration process of a mixture of calcium aluminate cement (CAC) and solar photovoltaic cell waste was researched and analyzed. The nature of the hydration products of various compositions of these mixtures was evaluated at a temperature of 20 1C by analyzing the samples through X-ray diffraction, infrared spectroscopy and scanning electron microscopy. The total porosity and mechanical strength development of these materials were also determined. It was revealed that the presence of a solar cell residue of up to 5% in the cement matrices does not result in new hydration products that are different from those derived from the normal hydration of the CAC cement. Moreover, the material developed can be considered as an expansive cement blend because it releases H2 at early stages. The presence of waste causes a decrease in the mechanical strength and an increase in the total porosity of this material, but it can be used for applications such as thermal insulation Tue, 23 Apr 2013 12:39:32 GMT http://hdl.handle.net/2117/18957 2013-04-23T12:39:32Z Fernández Carrasco, Lucía; Ferrer, R.; Aponte Hernández, Diego Fernando; Fernández, P. no Solar cells, Silicon, Recycling, New applications, Building This is a study of the recycling of crystalline solar cells by incorporating them in cement matrices. The hydration process of a mixture of calcium aluminate cement (CAC) and solar photovoltaic cell waste was researched and analyzed. The nature of the hydration products of various compositions of these mixtures was evaluated at a temperature of 20 1C by analyzing the samples through X-ray diffraction, infrared spectroscopy and scanning electron microscopy. The total porosity and mechanical strength development of these materials were also determined. It was revealed that the presence of a solar cell residue of up to 5% in the cement matrices does not result in new hydration products that are different from those derived from the normal hydration of the CAC cement. Moreover, the material developed can be considered as an expansive cement blend because it releases H2 at early stages. The presence of waste causes a decrease in the mechanical strength and an increase in the total porosity of this material, but it can be used for applications such as thermal insulation http://hdl.handle.net/2117/18774 Title: Model for enhancing integrated identification, assessment, and operational control of on-site environmental impacts and health and safety risks in construction firms Authors: Gangolells Solanellas, Marta; Casals Casanova, Miquel; Forcada Matheu, Núria; Fuertes Casals, Alba; Roca Ramon, Xavier Abstract: Certifiable management-system standards apply similar management techniques and principles, but each system still tends to have a separate structure in construction companies. Research and practice have demonstrated that management tasks may be duplicated when standards are implemented in parallel. Consequently, integrated management systems are strongly advocated. However, existing literature demonstrates that the integration of planning and control instruments involves a high level of uncertainty. This paper presents an innovative model to enhance the integration of environmental- and health and safety – management systems in construction companies, focusing on the subsystems for identifying, assessing, and operationally controlling environmental aspects and health and safety hazards and using risk as an integrating factor. The findings of this study have direct implications for both designers and contractors because the model helps to explicitly consider on-site environmental impacts and construction-worker safety during the design process and offers on-site guidance to eliminate the remaining impacts and risks or reduce them to acceptable levels. A case study is reported to illustrate the practical use of the proposed model and its benefits. Thu, 11 Apr 2013 14:36:42 GMT http://hdl.handle.net/2117/18774 2013-04-11T14:36:42Z Gangolells Solanellas, Marta; Casals Casanova, Miquel; Forcada Matheu, Núria; Fuertes Casals, Alba; Roca Ramon, Xavier no Certifiable management-system standards apply similar management techniques and principles, but each system still tends to have a separate structure in construction companies. Research and practice have demonstrated that management tasks may be duplicated when standards are implemented in parallel. Consequently, integrated management systems are strongly advocated. However, existing literature demonstrates that the integration of planning and control instruments involves a high level of uncertainty. This paper presents an innovative model to enhance the integration of environmental- and health and safety – management systems in construction companies, focusing on the subsystems for identifying, assessing, and operationally controlling environmental aspects and health and safety hazards and using risk as an integrating factor. The findings of this study have direct implications for both designers and contractors because the model helps to explicitly consider on-site environmental impacts and construction-worker safety during the design process and offers on-site guidance to eliminate the remaining impacts and risks or reduce them to acceptable levels. A case study is reported to illustrate the practical use of the proposed model and its benefits. http://hdl.handle.net/2117/18750 Title: Análisis numérico de la influencia de la fisuración en el comportamiento de una presa de hormigón Authors: Campos, A.; López Garello, Carlos María; Aguado de Cea, Antonio Abstract: This paper introduces a 2D simulation of a cross section of the block 13-14 of Mequinenza Dam, which presents pronounced and uncommon remaining displacements. Joint elements have been included in to the model with a nonlinear constitutive law in order to represent the cracking of concrete. Potential cracking planes defined according with the crack pattern observed in the upstream face were incorporated. The numerical results show how the formation, evolution and opening of a series of horizontal cracks provide much of the observed displacements, thus helping to explain the uncommon behavior detected in the dam. In this study, the influence of fracture parameters such as tensile strength and fracture energy of the joints was considered. En este artículo se presenta una simulación 2D de una sección transversal del bloque 13-14 de la presa de Mequinenza que presenta unos movimientos remanentes acentuados en este bloque. Se ha incluido elementos junta con un comportamiento constitutivo no lineal para representar la fisuración. Se han incorporado en el modelo planos potenciales de fisuración, coincidiendo con algunas juntas de construcción, para lo cual se ha tenido en cuenta un levantamiento detallado de fisuras realizado en paramento aguas arriba de la presa. Los resultados numéricos obtenidos muestran cómo la formación, evolución y apertura de una serie de fisuras horizontales aportan gran parte de los desplazamientos observados en la estructura y permiten explicar de forma consistente el comportamiento diferenciado detectado en la presa. Los trabajos han incluido diversos análisis sobre la influencia de parámetros de fractura, como la resistencia a tracción y la energía de fractura de las juntas. Tue, 09 Apr 2013 18:37:57 GMT http://hdl.handle.net/2117/18750 2013-04-09T18:37:57Z Campos, A.; López Garello, Carlos María; Aguado de Cea, Antonio no Fisuración, Análisis numérico con elementos junta, Presas de hormigón This paper introduces a 2D simulation of a cross section of the block 13-14 of Mequinenza Dam, which presents pronounced and uncommon remaining displacements. Joint elements have been included in to the model with a nonlinear constitutive law in order to represent the cracking of concrete. Potential cracking planes defined according with the crack pattern observed in the upstream face were incorporated. The numerical results show how the formation, evolution and opening of a series of horizontal cracks provide much of the observed displacements, thus helping to explain the uncommon behavior detected in the dam. In this study, the influence of fracture parameters such as tensile strength and fracture energy of the joints was considered. En este artículo se presenta una simulación 2D de una sección transversal del bloque 13-14 de la presa de Mequinenza que presenta unos movimientos remanentes acentuados en este bloque. Se ha incluido elementos junta con un comportamiento constitutivo no lineal para representar la fisuración. Se han incorporado en el modelo planos potenciales de fisuración, coincidiendo con algunas juntas de construcción, para lo cual se ha tenido en cuenta un levantamiento detallado de fisuras realizado en paramento aguas arriba de la presa. Los resultados numéricos obtenidos muestran cómo la formación, evolución y apertura de una serie de fisuras horizontales aportan gran parte de los desplazamientos observados en la estructura y permiten explicar de forma consistente el comportamiento diferenciado detectado en la presa. Los trabajos han incluido diversos análisis sobre la influencia de parámetros de fractura, como la resistencia a tracción y la energía de fractura de las juntas. http://hdl.handle.net/2117/18749 Title: Design of macro-synthetic fibre reinforced concrete pipes Authors: Fuente Antequera, Albert de la; Campos Escariz, Renata; Domingues de Figueiredo, Antonio; Aguado de Cea, Antonio Abstract: This paper presents an experimental campaign in which concrete pipes were manufactured using plastic fibres as the sole reinforcement material. In this regard, it has been demonstrated that the use of plastic fibres is compatible with pipe production systems, and that, when subjected to the crushing test (CT), plastic fibre reinforced pipes yield strength classes that are attractive in terms of the growth of this material in the concrete pipe industry. Moreover, the results obtained from both the characterisation of the material and the mechanical behaviour of the pipes have been used to verify that the Model for the Analysis of Pipes (MAPs) is an appropriate tool for the design of such pipes. Finally, this paper presents a direct design methodology which was used to establish the firsts design tables for fibre reinforced concrete pipes presented in the scientific literature. This methodology can be used to estimate the strength requirements of the fibre reinforced concrete needed to reach the strength classes set out in EN 1916:2002, without having to resort to the CT as an indirect design method. Tue, 09 Apr 2013 18:29:17 GMT http://hdl.handle.net/2117/18749 2013-04-09T18:29:17Z Fuente Antequera, Albert de la; Campos Escariz, Renata; Domingues de Figueiredo, Antonio; Aguado de Cea, Antonio no This paper presents an experimental campaign in which concrete pipes were manufactured using plastic fibres as the sole reinforcement material. In this regard, it has been demonstrated that the use of plastic fibres is compatible with pipe production systems, and that, when subjected to the crushing test (CT), plastic fibre reinforced pipes yield strength classes that are attractive in terms of the growth of this material in the concrete pipe industry. Moreover, the results obtained from both the characterisation of the material and the mechanical behaviour of the pipes have been used to verify that the Model for the Analysis of Pipes (MAPs) is an appropriate tool for the design of such pipes. Finally, this paper presents a direct design methodology which was used to establish the firsts design tables for fibre reinforced concrete pipes presented in the scientific literature. This methodology can be used to estimate the strength requirements of the fibre reinforced concrete needed to reach the strength classes set out in EN 1916:2002, without having to resort to the CT as an indirect design method. http://hdl.handle.net/2117/18738 Title: Influence of building type on post-handover defects in housing Authors: Forcada Matheu, Núria; Macarulla Martí, Marcel; Fuertes Casals, Alba; Casals Casanova, Miquel; Gangolells Solanellas, Marta; Roca Ramon, Xavier Abstract: Clients’ lack of involvement in defining quality requirements for dwellings built by developers leads to a perception of poor quality at the time of purchase. The research presented in this paper aims to broaden previous research on defects by analyzing the defects that remain in the post-handover stage, which usually lasts 12 months after the handover period, and identifying the factors that influence the appearance of these defects, determining whether a significant difference exists in the quality of the two main residential building types built by developers: flats and detached houses. It also analyzes and discusses the areas and elements in which the defects were detected. The data were obtained from client complaint forms completed after the handover of 95 dwellings in Spain. The data were then statistically analyzed using a t-test analysis, a Pearson’s parametric correlation, and a chi-square test. The research reveals that clients detect more defects in flats than in detached houses. The lower quality of the materials used in flats and the tighter schedule to which flats are subject may cause these differences. Tue, 09 Apr 2013 14:50:53 GMT http://hdl.handle.net/2117/18738 2013-04-09T14:50:53Z Forcada Matheu, Núria; Macarulla Martí, Marcel; Fuertes Casals, Alba; Casals Casanova, Miquel; Gangolells Solanellas, Marta; Roca Ramon, Xavier no Clients’ lack of involvement in defining quality requirements for dwellings built by developers leads to a perception of poor quality at the time of purchase. The research presented in this paper aims to broaden previous research on defects by analyzing the defects that remain in the post-handover stage, which usually lasts 12 months after the handover period, and identifying the factors that influence the appearance of these defects, determining whether a significant difference exists in the quality of the two main residential building types built by developers: flats and detached houses. It also analyzes and discusses the areas and elements in which the defects were detected. The data were obtained from client complaint forms completed after the handover of 95 dwellings in Spain. The data were then statistically analyzed using a t-test analysis, a Pearson’s parametric correlation, and a chi-square test. The research reveals that clients detect more defects in flats than in detached houses. The lower quality of the materials used in flats and the tighter schedule to which flats are subject may cause these differences. 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/2117/18653 Title: Numerical analysis of Mequinenza dam Authors: Buil, J.; Río, F.; Campos, A.; López Garello, Carlos María; Aguado de Cea, Antonio Abstract: Due to its historical and strategic significance, the Mequinenza dam has a vital importance within the Spanish hydrographic system. From its early stages in the 1960s, it is endowed with a complex and complete auscultation system which at one time detected some remanent displacements, the cause of which was attributed to the swelling (expansion induced by water absorption) of the dam concrete. The works carried out during the 1970s were efficient in controlling the movements, but the diagnosis given includes several questionable aspects. The diagnosis has been recently reformulated and a new proposal has been put forward, explaining the displacements produced more consistently [1]. This paper introduces a numerical analysis based on the 2D finite elements method (FEM), which includes joint elements with no thickness in order to represent the formation and growth of cracking, the results from which support the new proposal regarding the behavior of this dam. Fri, 05 Apr 2013 15:00:55 GMT http://hdl.handle.net/2117/18653 2013-04-05T15:00:55Z Buil, J.; Río, F.; Campos, A.; López Garello, Carlos María; Aguado de Cea, Antonio no Due to its historical and strategic significance, the Mequinenza dam has a vital importance within the Spanish hydrographic system. From its early stages in the 1960s, it is endowed with a complex and complete auscultation system which at one time detected some remanent displacements, the cause of which was attributed to the swelling (expansion induced by water absorption) of the dam concrete. The works carried out during the 1970s were efficient in controlling the movements, but the diagnosis given includes several questionable aspects. The diagnosis has been recently reformulated and a new proposal has been put forward, explaining the displacements produced more consistently [1]. This paper introduces a numerical analysis based on the 2D finite elements method (FEM), which includes joint elements with no thickness in order to represent the formation and growth of cracking, the results from which support the new proposal regarding the behavior of this dam.