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Óscar López-Zaldívar
Departamento de Tecnología de la Edificación, Escuela Técnica Superior de Edificación, Universidad Politécnica de Madrid, 28040 Madrid, Spain

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Journal article
Published: 16 July 2021 in Materials
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The principal objective of this research project is the disposal of end-of-life tire rubber waste and its incorporation in gypsum composites. As a continuation of previous projects, which established a reduction in the mechanical properties of the resulting products, the behavior of these composites is analyzed with the incorporation of carbon fibers. The density, Shore C hardness, flexural strength, compressive strength, dynamic modulus of elasticity, strength–strain curves, toughness and resistance values and microstructure of the material are studied and compared. The results obtained show a significant increase in the mechanical tensile strength of all of the samples containing fibers. The moduli of elasticity results show a decrease in rigidity and increase in toughness and resistance of the material produced by incorporating the fibers. An optimum dosage of a water/gypsum ratio of 0.6 and incorporation of 1.5% carbon fibers is proposed. This lightweight material, which offers a high mechanical performance, features characteristics which are suitable for large prefabricated building elements in the form of panels or boards.

ACS Style

Rafael Lozano-Díez; Óscar López-Zaldívar; Sofía Herrero-Del-Cura; Pablo Mayor-Lobo; Francisco Hernández-Olivares. Mechanical Behavior of Plaster Composites Based on Rubber Particles from End-of-Life Tires Reinforced with Carbon Fibers. Materials 2021, 14, 3979 .

AMA Style

Rafael Lozano-Díez, Óscar López-Zaldívar, Sofía Herrero-Del-Cura, Pablo Mayor-Lobo, Francisco Hernández-Olivares. Mechanical Behavior of Plaster Composites Based on Rubber Particles from End-of-Life Tires Reinforced with Carbon Fibers. Materials. 2021; 14 (14):3979.

Chicago/Turabian Style

Rafael Lozano-Díez; Óscar López-Zaldívar; Sofía Herrero-Del-Cura; Pablo Mayor-Lobo; Francisco Hernández-Olivares. 2021. "Mechanical Behavior of Plaster Composites Based on Rubber Particles from End-of-Life Tires Reinforced with Carbon Fibers." Materials 14, no. 14: 3979.

Journal article
Published: 14 May 2021 in Forests
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Nowadays, an increasing number of large cities, districts, and towns have tools for the Planning and Management of Green Infrastructures. All such tools seek a progression towards a future city model that is more resilient on an environmental, economic, and social level. To achieve this, emphasis is placed on the creation of a green infrastructure and, particularly, on improving urban biodiversity, urban forests, the value of natural areas in the urban environment, periurban agriculture, ecological connectivity, and accessibility. Moreover, the recent COVID19 health crisis has further highlighted that the city dweller’s relationship with the environment requires a reconciliation with nature and rural life that goes beyond typical compartmentalization. The objective must be to emphasize the need to establish creative processes which, through micro-scale activities (landscaping), generate the articulation of visible actions on a territorial scale (landscape planning) in both the natural environment (environmental landscape planning) and the urban environment (town planning based on the landscape). This article analyzes the issue of the large towns in south-west Madrid, where there is a dramatic divide on the border between the city landscape and the surrounding natural or agricultural landscape, and where there is an increasing need to establish landscapes with a certain uniqueness and to classify them as protected periurban areas, nature reserves, or land for which use and management is regulated. It is therefore important to develop environmental quality standards to assess Green Infrastructures as a whole: the administrative processes, their design, construction, maintenance, and resilience. This research focuses upon how this change in the planning and management of green periurban areas improves the multifunctionality of periurban spaces along with the intrinsic quality of the landscape, and promotes the city’s sustainability and resilience and improves governance. From the conclusions drawn, it should be noted that analysis, design, and action should be built on premises of sustainability and multifunctionality, and comply with the criteria for characterizing elements as green infrastructure. In the field of study, the characterization of the periurban area, and its subsequent assessment as a green infrastructure, provide the guidelines for action for devising an Open Space Strategy. This strategy constitutes a cross-disciplinary planning tool for local authorities when reading the landscape.

ACS Style

Eva Fernández-Pablos; Amparo Verdú-Vázquez; Óscar López-Zaldívar; Rafael Lozano-Diez. Periurban Areas in the Design of Supra-Municipal Strategies for Urban Green Infrastructures. Forests 2021, 12, 626 .

AMA Style

Eva Fernández-Pablos, Amparo Verdú-Vázquez, Óscar López-Zaldívar, Rafael Lozano-Diez. Periurban Areas in the Design of Supra-Municipal Strategies for Urban Green Infrastructures. Forests. 2021; 12 (5):626.

Chicago/Turabian Style

Eva Fernández-Pablos; Amparo Verdú-Vázquez; Óscar López-Zaldívar; Rafael Lozano-Diez. 2021. "Periurban Areas in the Design of Supra-Municipal Strategies for Urban Green Infrastructures." Forests 12, no. 5: 626.

Journal article
Published: 01 May 2020 in DYNA
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This article focuses upon the environmental conditioning of housing in warm and humid climates, and on obtaining thermal comfort conditions through predominantly passive means. The experimental analysis centers upon a representative example of the type of housing found in Havana (Cuba), a typical example of the warm-humid climate. Evolution of indoor temperatures for different natural ventilation and shading strategy scenarios are analyzed using dynamic simulation software. Comparing the indoor temperatures of the house, resulting from the simulation carried out, with the outdoors hour by hour and day to day provided by the model, the damping and amplitudes of the thermal wave are quantified in winter and summer conditions, depending on the different strategies adopted, and the thermal situations obtained in order to better housing habitability of the model are assessed.

ACS Style

Guillermo De Ignacio Vicens; Silvia Soutullo Castro; Oscar Lopez Zaldivar; Rafael Vicente Lozano Diez. EVOLUTION OF INDOOR TEMPERATURE IN WARM-HUMID CLIMATE HOUSING THROUGH DYNAMIC SIMULATION IN DIFFERENT SITUATIONS OF VENTILATION AND SHADING. DYNA 2020, 95, 261 -264.

AMA Style

Guillermo De Ignacio Vicens, Silvia Soutullo Castro, Oscar Lopez Zaldivar, Rafael Vicente Lozano Diez. EVOLUTION OF INDOOR TEMPERATURE IN WARM-HUMID CLIMATE HOUSING THROUGH DYNAMIC SIMULATION IN DIFFERENT SITUATIONS OF VENTILATION AND SHADING. DYNA. 2020; 95 (1):261-264.

Chicago/Turabian Style

Guillermo De Ignacio Vicens; Silvia Soutullo Castro; Oscar Lopez Zaldivar; Rafael Vicente Lozano Diez. 2020. "EVOLUTION OF INDOOR TEMPERATURE IN WARM-HUMID CLIMATE HOUSING THROUGH DYNAMIC SIMULATION IN DIFFERENT SITUATIONS OF VENTILATION AND SHADING." DYNA 95, no. 1: 261-264.

Journal article
Published: 01 July 2019 in DYNA
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In this paper, results about an experimental study performed on plaster compounds with the incorporation of rubber in the form of fibers from end of life tires are reported and analyzed. Test samples of plaster are prepared adding different volumetric fractions of rubber fibers that had been previously classified into two different sizes. The same consistency is fixed for every compound studied. Physical and mechanical properties are analyzed. Thermal behavior is also studied comparing thermal conductivity values and relating them with the bulk density of the resulting material. The results show an improvement in the thermal behavior proportional to the reduction of the density and the mechanical properties, as the proportion of rubber increases. It is also observed that there are no significant differences depending on the size of the fibers. These results confirm that the new material obtained is comparable to other materials of lightweight plaster with improved thermal properties and therefore with the same possibilities of use as these materials. The new material could be used for slabs and compression layers in building rehabilitation. Keywords: Plaster, rubber fibers, mechanical properties, thermal conductivity, acoustic insulation.

ACS Style

Rafael Vicente Lozano Diez; Oscar Lopez Zaldivar; Sofia Herrero DEL Cura; Pablo Luis Mayor Lobo; Francisco Hernández-Olivares. INFLUENCE OF THE ADDITION OF RUBBER FIBERS FROM END-OF-LIFE TIRES ON PLASTER MORTARS. STUDY OF MECHANICAL, THERMAL AND ACOUSTIC PROPERTIES. DYNA 2019, 94, 460 -464.

AMA Style

Rafael Vicente Lozano Diez, Oscar Lopez Zaldivar, Sofia Herrero DEL Cura, Pablo Luis Mayor Lobo, Francisco Hernández-Olivares. INFLUENCE OF THE ADDITION OF RUBBER FIBERS FROM END-OF-LIFE TIRES ON PLASTER MORTARS. STUDY OF MECHANICAL, THERMAL AND ACOUSTIC PROPERTIES. DYNA. 2019; 94 (1):460-464.

Chicago/Turabian Style

Rafael Vicente Lozano Diez; Oscar Lopez Zaldivar; Sofia Herrero DEL Cura; Pablo Luis Mayor Lobo; Francisco Hernández-Olivares. 2019. "INFLUENCE OF THE ADDITION OF RUBBER FIBERS FROM END-OF-LIFE TIRES ON PLASTER MORTARS. STUDY OF MECHANICAL, THERMAL AND ACOUSTIC PROPERTIES." DYNA 94, no. 1: 460-464.

Conference paper
Published: 01 March 2019 in INTED2019 Proceedings
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ACS Style

Amparo Verdú-Vázquez; Oscar Lopez Zaldivar; María De Las Nieves González; Javier Rivera-Cortés. USE OF NEW METHODOLOGIES FOR THE IMPROVEMENT OF LEARNING IN A POSTGRADUATE COURSE OF THE UNIVERSIDAD POLITECNICA DE MADRID. INTED2019 Proceedings 2019, 933 -938.

AMA Style

Amparo Verdú-Vázquez, Oscar Lopez Zaldivar, María De Las Nieves González, Javier Rivera-Cortés. USE OF NEW METHODOLOGIES FOR THE IMPROVEMENT OF LEARNING IN A POSTGRADUATE COURSE OF THE UNIVERSIDAD POLITECNICA DE MADRID. INTED2019 Proceedings. 2019; ():933-938.

Chicago/Turabian Style

Amparo Verdú-Vázquez; Oscar Lopez Zaldivar; María De Las Nieves González; Javier Rivera-Cortés. 2019. "USE OF NEW METHODOLOGIES FOR THE IMPROVEMENT OF LEARNING IN A POSTGRADUATE COURSE OF THE UNIVERSIDAD POLITECNICA DE MADRID." INTED2019 Proceedings , no. : 933-938.

Conference paper
Published: 01 March 2019 in INTED2019 Proceedings
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ACS Style

Javier Pita Andreu; Oscar Lopez Zaldivar; Agustín Balcazar Fernández. A FLIPPED LEARNING EXPERIENCE IN DESCRIPTIVE GEOMETRY WITH 3D COMPUTER ASSISTED DESIGN SOFTWARE. INTED2019 Proceedings 2019, 1026 -1031.

AMA Style

Javier Pita Andreu, Oscar Lopez Zaldivar, Agustín Balcazar Fernández. A FLIPPED LEARNING EXPERIENCE IN DESCRIPTIVE GEOMETRY WITH 3D COMPUTER ASSISTED DESIGN SOFTWARE. INTED2019 Proceedings. 2019; ():1026-1031.

Chicago/Turabian Style

Javier Pita Andreu; Oscar Lopez Zaldivar; Agustín Balcazar Fernández. 2019. "A FLIPPED LEARNING EXPERIENCE IN DESCRIPTIVE GEOMETRY WITH 3D COMPUTER ASSISTED DESIGN SOFTWARE." INTED2019 Proceedings , no. : 1026-1031.

Journal article
Published: 28 December 2018 in Journal of Safety Research
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The figure of the Health and Safety Coordinator (HSC), as a necessary and competent engineer in the construction sector, emerged in Spain on December 25, 1997 as a result of the implementation of European Directive 92/57/EEC. The coming of age of this figure is a sufficient period of time for determining its implementation and impact within the construction sector. The research carried out in this article arose from the analysis of statistical data obtained through Public Authorities and Professional Bodies. The quantitative study of the data extracted is complemented by the creation of specific benchmark indicators which connect four fundamental variables in the construction industry: the number of accidents, volume of workers employed, building units, and health and safety coordination posts. Furthermore, the legislation governing the HSC engineer in each of the 28 Member States of the European Union is studied. The results show a high implementation rate for the figure of the HSC, as well as a positive impact in relation to the reduced accident rate in the construction sector. Likewise, an update to the procedures of the various authorities is considered to be necessary in order to make the data concerning the actual work of the health and safety coordinators public. Finally, a review of the Spanish legislation concerning the HSC Coordinator is considered to be inevitable, in order to bring it up to the levels of professional skill and competence defined by the majority of European Union Member States.

ACS Style

Rafael Vicente Lozano-Díez; Oscar López-Zaldívar; Sofía Herrero del Cura; Amparo Verdú-Vázquez. Analysis of the impact of health and safety coordinator on construction site accidents: The case of Spain. Journal of Safety Research 2018, 68, 149 -156.

AMA Style

Rafael Vicente Lozano-Díez, Oscar López-Zaldívar, Sofía Herrero del Cura, Amparo Verdú-Vázquez. Analysis of the impact of health and safety coordinator on construction site accidents: The case of Spain. Journal of Safety Research. 2018; 68 ():149-156.

Chicago/Turabian Style

Rafael Vicente Lozano-Díez; Oscar López-Zaldívar; Sofía Herrero del Cura; Amparo Verdú-Vázquez. 2018. "Analysis of the impact of health and safety coordinator on construction site accidents: The case of Spain." Journal of Safety Research 68, no. : 149-156.

Journal article
Published: 17 May 2018 in Anales de Edificación
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ResumenEn el acondicionamiento natural de una vivienda en clima cálido-húmedo juegan un papel importante factores tales como la inercia térmica, el aislamiento, las diferentes tipologías constructivas y la ventilación. En este contexto, hay diversidad de opiniones sobre las funcionalidades de la inercia térmica y del aislamiento, por lo que este trabajo plantea revisar dichos factores en una localización geográfica representativa de este tipo de clima como es la de La Habana (Cuba). Se estudia la amortiguación y el desfase de la onda térmica; la evolución libre de las temperaturas interiores mediante simulación por ordenador, tomando como ejemplo una vivienda de aproximadamente 60 m2 y sistema constructivo habitual de los bloques de viviendas de La Habana; y la incidencia del aislamiento aplicado a los cerramientos exteriores en el acondicionamiento natural de la vivienda, teniendo en cuenta las características concretas del clima cálido-húmedo que nos ocupa.AbstractFor the natural conditioning of a dwelling in warm-humid climate, factors such as thermal inertia, insulation, different building typologies and ventilation play an important role. In this context, there are different opinions on the functionalities of thermal inertia and isolation. This paper proposes to review these factors in a representative geographical location of warm-humid climate such as that of Havana (Cuba). Both the damping and the lag of the thermal wave are studied. The free evolution of the inner temperatures by means of computer simulation are also analyzed, in a dwelling of 60 m2 and traditional building system of the housing blocks in Havana. Likewise, the investigation focus on the effects of the insulation layer of the external enclosures in the natural conditioning of the house under the above mentioned conditions and its repercussion in comfort. Appropriate strategies for the environmental conditioning of houses are inferred.

ACS Style

Guillermo De Ignacio Vivens; Silvia Soutullo Castro; Óscar López-Zaldívar; Rafael V. Lozano Diez; Amparo Verdú Vázquez. Sobre inercia térmica y aislamiento de viviendas en clima cálido-húmedo = On thermal inertia and insulation of buildings in warm-humid climate. Anales de Edificación 2018, 4, 14 -26.

AMA Style

Guillermo De Ignacio Vivens, Silvia Soutullo Castro, Óscar López-Zaldívar, Rafael V. Lozano Diez, Amparo Verdú Vázquez. Sobre inercia térmica y aislamiento de viviendas en clima cálido-húmedo = On thermal inertia and insulation of buildings in warm-humid climate. Anales de Edificación. 2018; 4 (1):14-26.

Chicago/Turabian Style

Guillermo De Ignacio Vivens; Silvia Soutullo Castro; Óscar López-Zaldívar; Rafael V. Lozano Diez; Amparo Verdú Vázquez. 2018. "Sobre inercia térmica y aislamiento de viviendas en clima cálido-húmedo = On thermal inertia and insulation of buildings in warm-humid climate." Anales de Edificación 4, no. 1: 14-26.

Journal article
Published: 24 April 2018 in Advances in Building Education
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ResumenEn el año 2014, A nivel europeo, la Directiva 2014/24/UE sobre contratación pública establece la necesidad de emplear sistemas electrónicos (medios de comunicación y herramientas para modelar los datos del edificio) en procesos de contratación de obras, servicios y suministros. En España el Ministerio de Fomento, quien a través de su comisión BIM, ha establecido que a partir de diciembre de 2018 los edificios públicos y julio de 2019 las infraestructuras de titularidad pública, se proyecten conforme a la metodología BIM. Con este planeamiento y calendario resultaba imprescindible dar respuesta desde la Universidad implementando nuevas disciplinas, o adaptando las existentes, que dieran como resultado la adquisición de habilidades y competencias necesarias para la correcta formación de los futuros profesionales, tal y como se demanda en diferentes universidades europeas. Por este motivo, ese mismo año, desde el departamento de Tecnología de Edificación de la ETS de Edificación, ante la dificultad para modificar el plan de estudios, de adaptar de forma inmediata disciplinas ya existentes y/o establecer una rigurosa y comprometida formación de docentes, a nivel casi individual de los profesores firmantes de la presente, se propone una nueva asignatura optativa que permitiera a los alumnos interesados iniciarse en la metodología de trabajo BIM. Una vez puesta en marcha la asignatura y como única reglada en el ámbito, nuestro objetivo está claro. El estudio sobre su implantación en el alumnado y su grado de satisfacción; el cumplimiento de la finalidad para la que fue creada, así como contemplar las diferentes propuestas de los propios alumnos al respecto de su intensificación docente. Los resultados obtenidos son altamente satisfactorios y anuncian una muy alta necesidad demandada por los propios alumnos al respecto de intensificar e incorporar la docencia BIM como herramienta esencial para sus estudios y posterior desarrollo profesional.AbstractDirective 2014/24 / EU on public procurement establishes in 2014 at European level the need to use electronic systems (means of communication and tools to model building data) in contracting procedures of building works, services and supplies. In Spain, the Ministry of Development has established through its BIM commission, that as of December 2018 and July 2019, both public buildings and infrastructures under public ownership respectively, are projected in accordance with the BIM methodology. Under this schedule it was essential for the Spanish University to respond by implementing new disciplines, or adapting the existing ones, to achieve skills and competencies for the proper training of future professionals, as it is demanded in other European universities. For this reason, the Department of Building Technology of the ETS Edificación (Universidad Politécnica de Madrid), faced the difficulties of adapting existing disciplines and established a rigorous teacher training method, at an almost individual level. It was proposed a new optional subject that would allow interested students to get started on the BIM work methodology. This experience has been the only formal training established in the School of Building in the field of BIM. Once implemented, our first objective is clear: To study its level of implementation and to gauge the level of satisfaction among the students. In other words: To discuss the fulfillment of the purpose for which it was created, as well as to study different proposals regarding teaching intensification made by the students themselves. The results obtained are highly satisfactory and announce a very high demand by the students in order to intensify and incorporate BIM teaching as an essential tool for their studies and their professional development.

ACS Style

Rafael V. Lozano Diez; Oscar López Zaldívar; Sofia Herrero Del Cura; Pablo Luis Mayor Lobo. Primeras experiencias en formación reglada del entorno BIM: El caso del Grado en Edificación de la Universidad Politécnica de Madrid = First formal training experiences in the BIM environment. The case of the Degree in Building in the Universidad Politécnica de Madrid. Advances in Building Education 2018, 2, 109 -121.

AMA Style

Rafael V. Lozano Diez, Oscar López Zaldívar, Sofia Herrero Del Cura, Pablo Luis Mayor Lobo. Primeras experiencias en formación reglada del entorno BIM: El caso del Grado en Edificación de la Universidad Politécnica de Madrid = First formal training experiences in the BIM environment. The case of the Degree in Building in the Universidad Politécnica de Madrid. Advances in Building Education. 2018; 2 (1):109-121.

Chicago/Turabian Style

Rafael V. Lozano Diez; Oscar López Zaldívar; Sofia Herrero Del Cura; Pablo Luis Mayor Lobo. 2018. "Primeras experiencias en formación reglada del entorno BIM: El caso del Grado en Edificación de la Universidad Politécnica de Madrid = First formal training experiences in the BIM environment. The case of the Degree in Building in the Universidad Politécnica de Madrid." Advances in Building Education 2, no. 1: 109-121.

Journal article
Published: 01 March 2018 in DYNA
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This study aims to study the tracing methods of the ribbed squinches. This typology usually appears to cover spaces of square plan by octagonal plan ribbed vaults, a very common typology in Gothic architecture (chapter houses, funerary chapels and domes, …). For this purpose, two representative cases have been analyzed, with a very similar tracing but different scale: the Chapter House at Valencia Cathedral and the Sala dei Baroni at Castel Nuovo in Naples. The ensuing results left no doubt as to the efficacy of the newly discovered tracing methods and the standardisation of their construction. These results are not only applicable in the renovation of objects of artistic interest but also to prevent any damage to the Cultural Heritage. Key words: Gothic architecture, tracing methods, ribbed squinch, renovation, Valencia Cathedral / Castel Nuovo.

ACS Style

Tomas GIL Lopez; Amparo Verdu Vazquez; Oscar Lopez Zaldivar; Rafael Vicente Lozano Diez. ANALYSIS OF GOTHIC SQUINCH TRACING METHODS THROUGH TWO HISTORICAL CASES. DYNA 2018, 93, 141 -144.

AMA Style

Tomas GIL Lopez, Amparo Verdu Vazquez, Oscar Lopez Zaldivar, Rafael Vicente Lozano Diez. ANALYSIS OF GOTHIC SQUINCH TRACING METHODS THROUGH TWO HISTORICAL CASES. DYNA. 2018; 93 (1):141-144.

Chicago/Turabian Style

Tomas GIL Lopez; Amparo Verdu Vazquez; Oscar Lopez Zaldivar; Rafael Vicente Lozano Diez. 2018. "ANALYSIS OF GOTHIC SQUINCH TRACING METHODS THROUGH TWO HISTORICAL CASES." DYNA 93, no. 1: 141-144.

Journal article
Published: 01 December 2017 in Construction and Building Materials
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ACS Style

Oscar Lopez Zaldivar; Rafael V. Lozano Diez; A. Verdú-Vázquez; N. Llauradó-Pérez. Effects of the addition of inertized MSW fly ash on calcium aluminate cement mortars. Construction and Building Materials 2017, 157, 1106 -1116.

AMA Style

Oscar Lopez Zaldivar, Rafael V. Lozano Diez, A. Verdú-Vázquez, N. Llauradó-Pérez. Effects of the addition of inertized MSW fly ash on calcium aluminate cement mortars. Construction and Building Materials. 2017; 157 ():1106-1116.

Chicago/Turabian Style

Oscar Lopez Zaldivar; Rafael V. Lozano Diez; A. Verdú-Vázquez; N. Llauradó-Pérez. 2017. "Effects of the addition of inertized MSW fly ash on calcium aluminate cement mortars." Construction and Building Materials 157, no. : 1106-1116.

Journal article
Published: 01 December 2017 in Land Use Policy
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ACS Style

Amparo Verdú-Vázquez; Eva Fernández-Pablos; Rafael V. Lozano Diez; Oscar Lopez Zaldivar. Development of a methodology for the characterization of urban and periurban green spaces in the context of supra-municipal sustainability strategies. Land Use Policy 2017, 69, 75 -84.

AMA Style

Amparo Verdú-Vázquez, Eva Fernández-Pablos, Rafael V. Lozano Diez, Oscar Lopez Zaldivar. Development of a methodology for the characterization of urban and periurban green spaces in the context of supra-municipal sustainability strategies. Land Use Policy. 2017; 69 ():75-84.

Chicago/Turabian Style

Amparo Verdú-Vázquez; Eva Fernández-Pablos; Rafael V. Lozano Diez; Oscar Lopez Zaldivar. 2017. "Development of a methodology for the characterization of urban and periurban green spaces in the context of supra-municipal sustainability strategies." Land Use Policy 69, no. : 75-84.

Journal article
Published: 21 September 2017 in Anales de Edificación
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ResumenEste trabajo realiza un estudio comparativo de caracterización de vigas de madera aserradas y su comparación con la normativa. Para ello se ha utilizado dos tipos de madera muy diferentes, una muy heterogenea, con gran número de defectos, y otra muy homogénea, para comprobar la influencia de los nudos en el comportamiento mecánico de la madera. Para ello se han ensayado un total de 18 vigas de madera y 5 probetas a compresión. Posteriormente se ha realizado una comparativa con la normativa de caracterización, para comprobar su grado de definición. Se ha podido comprobar que dicha norma, se encuentra en el lado de la seguridad en el ámbito de las resistencias, pero que su definición es escasa en cuanto al módulo de elasticidad de la madera.AbstractThis work makes a comparative study of the characterization of sawn timber and its comparison with the standard. For this purpose, two very different types of wood have been used, one very heterogeneous, with a large number of defects, and a very homogeneous one, to verify the influence of the knots on the mechanical behavior of the wood. To this end, a total of 18 wooden beams and 5 test specimens have been tested. Subsequently a comparison has been made with the standardization of characterization, to verify its degree of definition. It has been possible to verify that this norm, is in the side of the security in the field of the resistances, but that its definition is scarce as far as the modulus of elasticity of the wood.

ACS Style

Enrique Gómez De La Peña; Alfonso Cobo Escamilla; Rafael Lozano Díez; Oscar López Zaldívar. Estudio comparativo entre valores característicos experimentales y normativos de madera aserrada de pino silvestre = Comparative study between experimental and normative values of sawnwood of wild pine. Anales de Edificación 2017, 3, 39 -48.

AMA Style

Enrique Gómez De La Peña, Alfonso Cobo Escamilla, Rafael Lozano Díez, Oscar López Zaldívar. Estudio comparativo entre valores característicos experimentales y normativos de madera aserrada de pino silvestre = Comparative study between experimental and normative values of sawnwood of wild pine. Anales de Edificación. 2017; 3 (2):39-48.

Chicago/Turabian Style

Enrique Gómez De La Peña; Alfonso Cobo Escamilla; Rafael Lozano Díez; Oscar López Zaldívar. 2017. "Estudio comparativo entre valores característicos experimentales y normativos de madera aserrada de pino silvestre = Comparative study between experimental and normative values of sawnwood of wild pine." Anales de Edificación 3, no. 2: 39-48.

Journal article
Published: 01 September 2017 in Construction and Building Materials
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ACS Style

Oscar Lopez Zaldivar; Rafael V. Lozano Diez; S. Herrero Del Cura; P. Mayor-Lobo; Francisco Hernández-Olivares. Effects of water absorption on the microstructure of plaster with end-of-life tire rubber mortars. Construction and Building Materials 2017, 150, 558 -567.

AMA Style

Oscar Lopez Zaldivar, Rafael V. Lozano Diez, S. Herrero Del Cura, P. Mayor-Lobo, Francisco Hernández-Olivares. Effects of water absorption on the microstructure of plaster with end-of-life tire rubber mortars. Construction and Building Materials. 2017; 150 ():558-567.

Chicago/Turabian Style

Oscar Lopez Zaldivar; Rafael V. Lozano Diez; S. Herrero Del Cura; P. Mayor-Lobo; Francisco Hernández-Olivares. 2017. "Effects of water absorption on the microstructure of plaster with end-of-life tire rubber mortars." Construction and Building Materials 150, no. : 558-567.

Dissertation
Published: 03 May 2017 in Desarrollo de conglomerados con la incorporación de cenizas volantes procedentes de la incineración de residuos sólidos urbanos
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Lopez Zaldivar, Oscar (2015). Desarrollo de conglomerados con la incorporación de cenizas volantes procedentes de la incineración de residuos sólidos urbanos. Thesis (Doctoral), E.T.S. de Edificación (UPM). https://doi.org/10.20868/UPM.thesis.36536. Esta tesis presenta los resultados de la investigación realizada sobre la inertización de cenizas volantes procedentes de residuos sólidos urbanos y su posterior encapsulación en distintas matrices de mortero. Durante el proceso de inertización, se ha logrado la inertización de éste residuo tóxico y peligroso (RTP) y también su valorización como subproducto. De esta forma se dispone de nueva “materia prima” a bajo coste y la eliminación de un residuo tóxico y peligroso con la consiguiente conservación de recursos naturales alternativos. La caracterización química de las cenizas analizadas refleja que éstas presentan altas concentraciones de cloruros, Zn y Pb. Durante la investigación se ha desarrollado un proceso de inertización de las cenizas volantes con bicarbonato sódico (NaHCO3) que reduce en un 99% el contenido en cloruros y mantiene el pH en valores óptimos para que la concentración de los metales pesados en el lixiviado sea mínima debido a su estabilización en forma de carbonatos insolubles. Se han elaborado morteros con cuatro tipos distintos de cementos (CEM-I, CEM-II, CAC y CSA) incorporando cenizas volantes inertizadas en una proporción igual a un 10% en peso del árido utilizado. Los morteros ensayados abarcan distintas dosificaciones tanto en la utilización de áridos con distintos diámetros (0/2 y 0/4), como en la relación cemento/árido (1/1 y 1/3). Se han obtenido las propiedades físicas y mecánicas de estos morteros mediante ensayos de Trabajabilidad, Estabilidad Dimensional, Carbonatación, Porosidad y Resistencias Mecánicas. De igual forma, se presentan resultados de ensayos de lixiviación de Zn, Pb, Cu y Cd, sobre probetas monolíticas de los morteros con los mejores comportamientos físico/mecánicos, donde se ha analizado el contenido en iones de dichos metales pesados lixiviados mediante determinación voltamperométrica de redisolución anódica Se concluye que todos los morteros ensayados son técnicamente aceptables, siendo los más favorables los elaborados con Cemento de Sulfoaluminato de Calcio (CSA) y con Cemento de Aluminato de Calcio (CAC). En este último caso, se mejoran las resistencias a compresión de los morteros de referencia en más de un 48%, y las resistencias a flexión en más de un 67%. De igual forma, los ensayos de lixiviado revelan la completa encapsulación de los iones de Zn y la mitigación en el lixiviado de los iones de Pb. Ambos morteros podrían ser perfectamente validos en actuaciones en las que se necesitase un producto de fraguado rápido, altas resistencias iniciales y compensación de las retracciones con una elevada estabilidad dimensional. En base a esto, el material podría ser utilizado como mortero de reparación en viales y pavimentos que requiriesen altas prestaciones, tales como: soleras industriales, pistas de aterrizaje, aparcamientos, etc. O bien, para la confección de elementos prefabricados sin armaduras estructurales, dada su elevada resistencia a flexión. ABSTRACT This dissertation presents the results of a research on inerting fly ash from urban solid waste and its subsequent encapsulation in mortar matrixes. The inerting of this hazardous toxic waste, as well as its valorization as a by-product has been achieved. In this way, a new "raw material" is available through a simple process and the toxic and hazardous waste is eliminated, and consequently, conservation of alternative natural resources is strengthened. Chemical analysis of the ashes analyzed shows high concentrations of soluble chlorides, Zn and Pb. An inerting process of fly ash with sodium bicarbonate (NaHCO3) has been developed which reduces 99% the content of chlorides and maintains pH at optimal values, so that the concentration of heavy metals in the leachate is minimum, due to its stabilization in the form of insoluble carbonates. Mortars with four different types of cements (CEM-I, CEM-II, CAC and CSA) have been developed by the addition of inertized fly ash in the form of carbonates, in the proportion of 10% in weight of the aggregates used. The samples tested include different proportions in the use of aggregates with different sizes (0/2 and 0/4), and in the cement/aggregate ratio (1/1 and 1/3). Physical/mechanical properties of these mortars have been studied through workability, dimensional stability, carbonation, porosity and mechanic strength tests. Leaching tests of Zn, Pb, Cu and Cd ions are also being performed on monolithic samples of the best behavioral mortars. The content in leachated heavy metal ions is being analyzed through stripping voltammetry determination. Conclusions drawn are that the tested CAC and CSA cement mortars present much better behavior than those of CEM-I and CEM-II cement. The results are especially remarkable for the CAC cement mortars, improving reference mortars compression strengths in more than 48%, and also bending strengths in more than 67%. Leaching tests confirm that the encapsulation of Zn and Pb is achieved and leachate of both ions is mitigated within the mortar matrixes. For the above stated reasons, it might be concluded that mortars made with calcium aluminate cements or calcium sulfoaluminate with the incorporation of treated fly ash, may be perfectly valid for uses in which a fast-curing product, with high initial strength and...

ACS Style

Oscar Lopez Zaldivar. Desarrollo de conglomerados con la incorporación de cenizas volantes procedentes de la incineración de residuos sólidos urbanos. Desarrollo de conglomerados con la incorporación de cenizas volantes procedentes de la incineración de residuos sólidos urbanos 2017, 1 .

AMA Style

Oscar Lopez Zaldivar. Desarrollo de conglomerados con la incorporación de cenizas volantes procedentes de la incineración de residuos sólidos urbanos. Desarrollo de conglomerados con la incorporación de cenizas volantes procedentes de la incineración de residuos sólidos urbanos. 2017; ():1.

Chicago/Turabian Style

Oscar Lopez Zaldivar. 2017. "Desarrollo de conglomerados con la incorporación de cenizas volantes procedentes de la incineración de residuos sólidos urbanos." Desarrollo de conglomerados con la incorporación de cenizas volantes procedentes de la incineración de residuos sólidos urbanos , no. : 1.

Journal article
Published: 30 April 2017 in Advances in Building Education
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ResumenLas metodologías de aprendizaje tradicionales no son coherentes con los procesos de aprendizaje y descriptivos que irrumpen en las disciplinas de la mano de programas informáticos. La evolución del campo de las enseñanzas técnicas es muy veloz. Sin embargo, no hay tecnología que sea lo suficientemente rápida en su implantación que no permita el introducir nuevas formas de enseñanza.No debemos equivocarnos al hablar de aprendizaje multidimensional solamente en el sentido, que se le ha dado a veces, de aquel que proviene de diferentes fuentes (de la escuela, del entorno laboral, del barrio, de la familia,…) Se trata de darle un sentido de literalidad, basándose en las características dimensionales que en este caso se adoptan de los sistemas gráficos BIM (Building Information Modeling). En una primera fase se lleva a cabo en las disciplinas MEP (referentes a las instalaciones Mecánicas, Eléctricas e Hidrosanitarias–Plomería.) Para ello hacemos una pequeña descripción de las dimensiones consideradas agrupadas, por tratarse de un resumen, que las identifique con las actividades propuestas. No se trata solamente de un modelo creador, que es como está diseñado, sino también se ha realizado una adaptación como modelo descriptivo. Se usa las dimensiones 1D y 2D para definir las condiciones de partida del aprendizaje, representar a grandes rasgos la tecnología a estudiar y poder empezar a utilizar métodos gráficos para la comprensión del objeto de aprendizaje. Se usan las dimensiones 3D a 7D para la definición pormenorizada y el conocimiento profundo que van desde aspectos que incluyen: definición material, procesos de ejecución, costes, incidencia medioambiental, ciclo de vida y mantenimiento. La dimensión 8D propone la Socialización del aprendizaje. Debate y compartir las soluciones aportadas o analizar las propuestas de futuro. La dimensión 9D consiste en una Evaluación crítica. Nos permite contrastar el nivel de profundización, se incluye en el aprendizaje. Llegar a saber el LOD (Level of Development) a que ha llegado cada estudiante nos permite reiniciar el proceso con garantías de mejora.AbstractTraditional learning methodologies are not coherent with the learning and descriptive processes that break into the disciplines in the hand of software. The evolution of the field of technical education is very fast. However, there is no technology that is fast enough in its implementation that does not allow the introduction of new forms of teaching. We should not be mistaken when speaking of multidimensional learning only in the sense that it has sometimes been given of that which comes from different sources [1] (school, work environment, neighborhood, family, ...) Tries to give it a sense of literality, based on the dimensional characteristics that in this case are adopted of the BIM (Building Information Modeling). In the first phase it is carried out in the disciplines MEP (referring to the Mechanical, Electrical and Hydro sanitary-Plumbing facilities). To do this we make a small description of the dimensions considered grouped, as a summary that identifies them with the proposed activities. It is not only a creative model, which is how it is designed, but also an adaptation has been made as a descriptive model. Dimensions 1D and 2D are used to define the starting conditions of learning, to outline the technology to be studied and to be able to begin to use graphic methods for understanding the learning object. 3D dimensions to 7D are used for detailed definition and in-depth knowledge ranging from aspects including: material definition, execution processes, costs, environmental impact, life cycle and maintenance. The 8D dimension proposes the Socialization of learning. Debate and share the solutions provided or analyze future proposals. The 9D dimension consists of a Critical Assessment. It allows us to compare the level of deepening, is included in the learning. Getting to know the LOD (Level of Development) to which each student has arrived allows us to restart the process with guarantees of improvement.

ACS Style

Daniel García de Frutos; Amparo Verdú Vázquez; Francisco David De La Peña Esteban; Oscar Lopez Zaldivar. Desarrollo de una metodología basada en el aprendizaje multidimensional en las disciplinas técnicas = Development of a methodology based on multidimensional learning in technical disciplines. Advances in Building Education 2017, 1, 27 -36.

AMA Style

Daniel García de Frutos, Amparo Verdú Vázquez, Francisco David De La Peña Esteban, Oscar Lopez Zaldivar. Desarrollo de una metodología basada en el aprendizaje multidimensional en las disciplinas técnicas = Development of a methodology based on multidimensional learning in technical disciplines. Advances in Building Education. 2017; 1 (1):27-36.

Chicago/Turabian Style

Daniel García de Frutos; Amparo Verdú Vázquez; Francisco David De La Peña Esteban; Oscar Lopez Zaldivar. 2017. "Desarrollo de una metodología basada en el aprendizaje multidimensional en las disciplinas técnicas = Development of a methodology based on multidimensional learning in technical disciplines." Advances in Building Education 1, no. 1: 27-36.

Journal article
Published: 01 January 2017 in DYNA
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This article expands upon the results of previous research into inerting fly ash from urban solid waste and its encapsulation in mortar matrices. Given the heterogeneous composition of the MSWIFA, it was decided to replicate the inerting process with NaHCO3 in order to prove its efficiency. The results are conclusive, reducing the chloride content by close to 99%. Mortars were produced using two different types of cement (CEM-I and CSA) and incorporating treated fly ash using a substitution percentage of 10% in weight of the aggregate used. The physical and mechanical properties have been obtained through workability, dimensional stability, density and mechanical strength tests. The conclusions drawn are that CSA mortars containing inerted fly ash and coarser aggregates (0/4) improve the reference compressive strengths by more than 11% while bending resistance remains unaltered. These types of mortar also have a reduced workability period and better dimensional stability than the reference mortars and those containing fine aggregates (0/2)

ACS Style

Oscar Lopez Zaldivar; Rafael V. Lozano Diez; Amparo Verdu Vazquez; Tomas Gil Lopez. INERTIZACIÓN Y VALORIZACIÓN DE CENIZAS VOLANTES DE RESIDUOS SÓLIDOS URBANOS PARA LA FABRICACIÓN DE MORTEROS DE CEMENTO. DYNA 2017, 92, 230 -234.

AMA Style

Oscar Lopez Zaldivar, Rafael V. Lozano Diez, Amparo Verdu Vazquez, Tomas Gil Lopez. INERTIZACIÓN Y VALORIZACIÓN DE CENIZAS VOLANTES DE RESIDUOS SÓLIDOS URBANOS PARA LA FABRICACIÓN DE MORTEROS DE CEMENTO. DYNA. 2017; 92 (1):230-234.

Chicago/Turabian Style

Oscar Lopez Zaldivar; Rafael V. Lozano Diez; Amparo Verdu Vazquez; Tomas Gil Lopez. 2017. "INERTIZACIÓN Y VALORIZACIÓN DE CENIZAS VOLANTES DE RESIDUOS SÓLIDOS URBANOS PARA LA FABRICACIÓN DE MORTEROS DE CEMENTO." DYNA 92, no. 1: 230-234.

Conference paper
Published: 01 March 2016 in INTED2017 Proceedings
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M. Valiente López; S. Herrero Del Cura; I. Higuera Gutiérrez; Oscar Lopez Zaldivar; Rafael V. Lozano Diez; P. Mayor Lobo; M.C. Sanz Contreras; J.R. Osanz Díaz. INNOVATIVE SURVEYING METHODS IN EDIFICATION. INTED2017 Proceedings 2016, 1, 8058 -8066.

AMA Style

M. Valiente López, S. Herrero Del Cura, I. Higuera Gutiérrez, Oscar Lopez Zaldivar, Rafael V. Lozano Diez, P. Mayor Lobo, M.C. Sanz Contreras, J.R. Osanz Díaz. INNOVATIVE SURVEYING METHODS IN EDIFICATION. INTED2017 Proceedings. 2016; 1 ():8058-8066.

Chicago/Turabian Style

M. Valiente López; S. Herrero Del Cura; I. Higuera Gutiérrez; Oscar Lopez Zaldivar; Rafael V. Lozano Diez; P. Mayor Lobo; M.C. Sanz Contreras; J.R. Osanz Díaz. 2016. "INNOVATIVE SURVEYING METHODS IN EDIFICATION." INTED2017 Proceedings 1, no. : 8058-8066.

Journal article
Published: 22 July 2015 in Materiales de Construcción
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This article presents the results of a research developing high performance cement mortars with the addition of municipal solid waste incineration fly ash (MSWIFA) stabilized as insoluble carbonates. The encapsulation of hazardous wastes in mortar matrixes has also been achieved. The ashes present high concentrations of chlorides, Zn and Pb. A stabilization process with NaHCO3 has been developed reducing 99% the content of chlorides. Developed mortars replace 10% per weight of the aggregates by treated MSWIFA. Physical/mechanical properties of these mortars have been studied. Presence of Zn, Pb, Cu and Cd has been also analyzed confirming that leaching of these heavy metal ions is mitigated. Conclusions prove better behavior of CAC and CSA mortars than those of CEM-I and CEM-II cement. Results are remarkable for the CAC mortars, improving reference strengths in more than 25%, which make them a fast-curing product suitable for the repair of structures or industrial pavements

ACS Style

Oscar Lopez Zaldivar; P. L. Mayor-Lobo; Francisco Fernandez Martinez; F. Hernández-Olivares. Improved cement mortars by addition of carbonated fly ash from solid waste incinerators. Materiales de Construcción 2015, 65, e062 .

AMA Style

Oscar Lopez Zaldivar, P. L. Mayor-Lobo, Francisco Fernandez Martinez, F. Hernández-Olivares. Improved cement mortars by addition of carbonated fly ash from solid waste incinerators. Materiales de Construcción. 2015; 65 (319):e062.

Chicago/Turabian Style

Oscar Lopez Zaldivar; P. L. Mayor-Lobo; Francisco Fernandez Martinez; F. Hernández-Olivares. 2015. "Improved cement mortars by addition of carbonated fly ash from solid waste incinerators." Materiales de Construcción 65, no. 319: e062.