Serna Ros, Pedro
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- PublicationAprender de los errores. Una manera de adquirir responsabilidad ética, medioambiental y profesional(Editorial Universitat Politècnica de València, 2016-07-19) Giménez Carbó, Ester; Noguera Puchol, Guillermo; Pelufo Carbonell, María José; Coll Carrillo, Hugo; Serna Ros, Pedro; Departamento de Ingeniería de la Construcción y de Proyectos de Ingeniería Civil; Escuela Técnica Superior de Ingeniería de Caminos, Canales y Puertos; Instituto Universitario de Investigación de Ciencia y Tecnología del Hormigón[EN] This communication presents the way which has been introduced in transversal competition "Ethical, environmental and professional liability" in the subject "Constructions materials and their applications to civil engineering" of second degree course, to ensure the acquisition of a domain level I. The greatest achievement of this work is to have the transversal competition in all work sessions in the classroom, so the competition becomes part of the daily work of the student. Also present advantages in the acquisition of evidences and facilitates the evaluation of the competition.
- PublicationConcrete Early-Age Crack Closing by Autogenous Healing(MDPI AG, 2020-06) Roig-Flores, Marta; Serna Ros, Pedro; Departamento de Ingeniería de la Construcción y de Proyectos de Ingeniería Civil; Escuela Técnica Superior de Ingeniería de Caminos, Canales y Puertos; Instituto Universitario de Investigación de Ciencia y Tecnología del Hormigón[EN] Autogenous healing is mainly produced by continuing hydration or carbonation. The aim of this research is to quantify the crack closing produced by autogenous healing for early-age concrete. This healing was evaluated for two crack size levels, 0.1 mm and 0.4 mm, under three healing conditions: water immersion, a humidity chamber, and wet/dry cycles. Crack closing was evaluated after 7, 14, 28 and 42 days under healing conditions. The internal status of the cracks was verified visually and using phenolphthalein. The results show that specimens stored in the humidity chamber did not experience healing, while specimens under wet/dry cycles and water immersion achieved the complete closing of small-sized cracks (under 0.15 mm). Autogenous healing showed higher speed under wet/dry cycles but higher final efficiency under water immersion. However, the inspection of the interior of the specimens showed that self-closing occurred mostly on the surface, and carbonation in the crack faces was only noticed very near the specimen's surface. Additionally, this study proposes a preliminary strategy to model autogenous healing in concrete in terms of crack closing.
- PublicationHybrid UHPFRC thin walled "¶" beams for flat roofing applications(Editorial Universitat Politècnica de València, 2009-12-15T13:01:19Z) Camacho, Esteban; Serna Ros, Pedro; Departamento de Ingeniería de la Construcción y de Proyectos de Ingeniería Civil; Escuela Técnica Superior de Ingeniería de Caminos, Canales y Puertos; Instituto Universitario de Investigación de Ciencia y Tecnología del Hormigón; Domingo Cabo, Alberto; Lázaro Fernández, Carlos ManuelThe main hybrid UHPFRC properties are the high tensile strength it can achieve with a ductile behaviour and the close cracks it can develop during the strain-hardening, whereby its durability is improved. Those characteristics make this material especially suitable for carry tensile and flexural efforts in more slightly and new shapes elements, dispensing of conventional reinforcement. In this research, several hybrids UHPFRC mix compositions were designed and characterized for different levels of requirement in cost or strength, achieving values from 35 MPa to more than 45 MPa of equivalent linear elastic flexural tensile strength. The material composition includes high elastic limit steel fibres of two different sizes. Silica fume, aggregates type and qualities were also variables for this study in order to obtain different cost concretes. The workability of the mixture was designed for being high in order not to be compacted. A flat roof with similar purposes than conventional unidirectional flats was designed using thin walled ¿ cross section beams made with UHPFRC. Advantages on minimizing materials consumption, reducing self weight, construction procedures, transport facilities and other improvements make of this solution an interesting alternative to conventional solutions. To analyze the structural behaviour three thin walled ¿ cross section beams were made at actual dimensions in laboratory with different hybrid UHPFRC. Beams were tested in flexural four point bending tests. The load and associated deflection, the maximum load and cracking pattern were analysed and evaluated.
- PublicationAnalytical model for transfer length prediction of 13 mm prestressing strand(2007) Martí Vargas, José Rocío; Arbeláez, C.A.; Serna Ros, Pedro; Navarro Gregori, Juan; Pallarés Rubio, Luis; Departamento de Ingeniería de la Construcción y de Proyectos de Ingeniería Civil; Escuela Técnica Superior de Ingeniería de Caminos, Canales y Puertos; Instituto Universitario de Investigación de Ciencia y Tecnología del Hormigón; Ministerio de Ciencia y Tecnología; Universitat Politècnica de ValènciaAn experimental investigation to determine the transfer length of a seven-wire prestressing strand in different concretes is presented in this paper. A testing technique based on the analysis of bond behaviour by means of measuring the force supported by the prestressing strand on a series of specimens with different embedment lengths has been used. An analytical bond model to calculate the transfer length from an inelastic bond stress distribution along the transfer length has been obtained. A relationship between the plastic bond stress for transfer length and the concrete compressive strength at the time of prestress transfer has been found. An equation to predict the average and both the lower bound and the upper bound values of transfer length is proposed. The experimental results have not only been compared with the theoretical prediction from proposed equations in the literature, but also with experimental results obtained by several researchers.
- PublicationDiseño de un ensayo para el estudio experimental del anclaje de armaduras pasivas en nudos C-C-T(Elsevier, 2004-01-05) Miguel Sosa, Pedro Francisco; Martí Vargas, José Rocío; Fernández Prada, Miguel Ángel; Castro Bugallo, María Carmen; Bonet Senach, José Luís; Serna Ros, Pedro; Romero García, Manuel Luis; Departamento de Ingeniería de la Construcción y de Proyectos de Ingeniería Civil; Departamento de Mecánica de los Medios Continuos y Teoría de Estructuras; Escuela Técnica Superior de Ingeniería de Caminos, Canales y Puertos; Escuela Técnica Superior de Ingeniería Industrial; Instituto Universitario de Investigación de Ciencia y Tecnología del Hormigón; GENERALITAT VALENCIANA[EN] In this paper the prototype designed for the research project about the analysis of the anchorage-joint system behaviour in D regions which is being developed in the Dept. of Construction Engineering and Civil Engineer Projects is presented. The main objective in this experimental investigation is the development of an easy tool or a practical design formula to evaluate the necessary anchorage length of passive reinforcement in C-C-T joints as a function of the strut angle orientation. So that, it has been planned a laboratory test program to reproduce the conditions of these kind of joints where is possible the evaluation of the force equilibrated in the joint and the effort transmitted directly to the anchorage. It is described the experimental program including the geometry of a typical specimen, the load support system, the measurement device, and the test program scheduled.
- PublicationBond of reinforcing bars to steel fiber reinforced concrete(Elsevier, 2016-02) García Taengua, Emilio José; Martí Vargas, José Rocío; Serna Ros, Pedro; Departamento de Ingeniería de la Construcción y de Proyectos de Ingeniería Civil; Escuela Técnica Superior de Ingeniería de Caminos, Canales y Puertos; Instituto Universitario de Investigación de Ciencia y Tecnología del Hormigón; Ministerio de Ciencia e Innovación; Ministerio de Economía y CompetitividadSteel fiber reinforced concrete (SFRC) has been increasingly used during recent years. Regarding bond of rebars to concrete, fibers provide passive confinement and improve bond capacity in terms of bond strength and, more importantly, toughness. An extensive experimental programme has been carried out, and SFRC specimens with embedded rebars have been subjected to the Pull Out Test to obtain the bond stress slip curves, retaining the bond strength and the area under the curve as measures of the bond capacity of concrete. The following parameters were considered: concrete compressive strength (30-50 MPa), rebar diameter (8-20 mm), concrete cover (between 30 mm and 5 times rebar diameter), fiber content (up to 70 kg/m(3)), and the slenderness and length of the steel fibers used. Predictive equations have been obtained to relate the experimental results to the factors considered, and the trends observed have been analyzed and discussed. (C) 2015 Elsevier Ltd. All rights reserved.
- PublicationHAC 2018. V congreso iberoamericano de hormigón autocompactante y hormigones especiales(Editorial Universitat Politècnica de València, 2018-03-06) Serna Ros, Pedro; Martí Vargas, José Rocío; Llano Torre, Aitor; Departamento de Ingeniería de la Construcción y de Proyectos de Ingeniería Civil; Escuela Técnica Superior de Ingeniería de Caminos, Canales y Puertos; Instituto Universitario de Investigación de Ciencia y Tecnología del HormigónEl V Congreso Iberoamericano de Hormigón Autocompactante HAC 2018 tendrá lugar en las instalaciones de la Universitat Politècnica de València (UPV),España, durante los días 5 y 6 de marzo de 2018. Desde su 1ª edición, celebrada en Valencia,España, en 2008, este ciclo de congresos se ha consolidado como un foro que permite, a los ingenieros y investigadores que utilizan los idiomas español y portugués, la discusión y el intercambio de experiencias sobre las oportunidades y los retos del hormigón autocompactante (BAC) en los dominios tecnológico, científico y de aplicación.En esta nueva edición se ha pretendido ampliar la temática a hormigones especiales en general.En este sentido y a modo orientativo, se propone como Hormigones Especiales:Hormigones autocompactantes,Hormigones con fibras,Hormigones de altas y muy altas resistencias, Hormigones ligeros, Hormigones reciclados, Hormigones Autosanables..
- PublicationNumerical analysis of steel fiber reinforced concrete shells(Editorial Universitat Politècnica de València, 2009-12-23T10:27:24Z) RIBEIRO, Tatiana S. A.; Serna Ros, Pedro; Departamento de Ingeniería de la Construcción y de Proyectos de Ingeniería Civil; Escuela Técnica Superior de Ingeniería de Caminos, Canales y Puertos; Instituto Universitario de Investigación de Ciencia y Tecnología del Hormigón; Domingo Cabo, Alberto; Lázaro Fernández, Carlos ManuelHere, a simple numerical model for steel fiber concrete, based on a reinforced concrete model is presented. In the proposed model concrete is modeled using a finite element dedicated to brittle materials, available at ANSYS library. Fiber contribution to the multiaxial state of concrete is modeled by changing concrete parameters accordingly. Moreover, stress transfer by fiber bridging action is taken in account by considering the fibers as an equivalent smeared reinforcement. An appropriate although simple model for fiber reinforced concrete is therefore obtained by suitably adjusting the parameters of a reinforced concrete model. The proposed model is applied to shells which are part of the Wall of the Benidorm esplanade (Spain). Analyses are carried out on wall segments, considering the structure self-weight, and temperature variations. The numerical results obtained represent well the structural behavior.
- PublicationAn experimental study on the shear behaviour of reinforced concrete beams with macro-synthetic fibres(Elsevier, 2018) Ortiz-Navas, Francisco Roberto; Navarro Gregori, Juan; Leiva Herdocia, G.; Serna Ros, Pedro; Cuenca Asensio, Estefanía; Departamento de Ingeniería de la Construcción y de Proyectos de Ingeniería Civil; Escuela Técnica Superior de Ingeniería de Caminos, Canales y Puertos; Instituto Universitario de Investigación de Ciencia y Tecnología del Hormigón; Universitat Politècnica de València[EN] Shear behaviour in reinforced concrete (RC) elements can improve with an adequate amount of fibres. Research has recently determined how fibres affect shear strength, but has barely focused on macro synthetic fibre-reinforced concrete (PFRC). This paper presents the experimental results of 16 full-scale beams (eight RC, eight PFRC), 12 without transverse reinforcement. Polypropylene fibres (10 kg/m(3)) were included. Mode of failure (MOF) in shear and behaviour throughout the loading process were studied. The results obtained with fibres showed significantly improved shear strength in the RC beams with/without transverse reinforcement. A synergy between transverse reinforcement and fibres was observed in some cases. (C) 2018 Elsevier Ltd. All rights reserved.
- PublicationReliability of transmission length estimation from strand end slip(American Concrete Institute, 2007-07-01) Martí Vargas, José Rocío; Arbeláez, César A.; Serna Ros, Pedro; Castro Bugallo, María Carmen; Departamento de Ingeniería de la Construcción y de Proyectos de Ingeniería Civil; Escuela Técnica Superior de Ingeniería de Caminos, Canales y Puertos; Instituto Universitario de Investigación de Ciencia y Tecnología del Hormigón; European Regional Development Fund; MINISTERIO DE CIENCIA Y TECNOLOGIA; Ministerio de Educación y Ciencia[EN] An experimental program on twelve series of specimens with different embedment lengths to determine the transfer length was conducted. Transfer length test results of seven-wire strand on twelve different concrete mixtures were analyzed. A testing technique based on the analysis of bond behaviour by means of measuring the force supported by the tendon has been used. The specimens had been instrumented with slip measurement devices at each end of the specimen. A sequence of slip values at each end of the specimen after release versus the embedment length has been analyzed. The expressions relating the transfer length to the tendon end slip are presented. A value of Guyon's factor for tendon stress distribution shape has been obtained. Two criteria to determine the transfer length from the slip sequences at both ends of the specimens have been analyzed.