Sensitivity analysis of a stress strain model for steel fiber reinforced concrete plates

p. 2941-2954This article deals with the sensitivity study of a given model for the behavior of thin laminar elements of SFRC (steel fiber reinforced concrete). In order to carry out this analysis, a brief description of the model used for the behavior of the SFRC in laminar elements is presented. The analysis was made by means of ABAQUS finite element software with a particular model for the behavior of SFRC. The limit of the fragile-plastic behavior of SFRC plates has been established as an outcome of the analysis. The results of test performed on plates were compared with the numerical simulation. Good correlation between experimental results and those obtained in the numerical simulation was observed as an adequate support for the model.Lopez-Gayarre, F.; Serrano, MA.; Lázaro Fernández, CM.; Domingo Cabo, A.; Pelufo Carbonell, MJ. (2009). Sensitivity analysis of a stress strain model for steel fiber reinforced concrete plates. Editorial Universitat Politècnica de València. http://hdl.handle.net/10251/668

Aprender de los errores. Una manera de adquirir responsabilidad ética, medioambiental y profesional

[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.[ES] En esta comunicación se presenta el modo en que se ha introducido la competencia transversal “Responsabilidad ética, medioambiental y profesional” en la asignatura “Materiales de Construcción y sus aplicaciones a la ingeniería civil” de segundo curso de grado, para garantizar la adquisición de un nivel de dominio I. El mayor logro de este trabajo es tener presente la competencia transversal en todas las sesiones de trabajo en el aula a lo largo del curso, por lo que la competencia pasa a formar parte del trabajo diario del alumno. Además presente ventajas en cuando a la adquisición de evidencias y facilita la evaluación de la misma.Giménez Carbó, E.; Noguera Puchol, G.; Pelufo Carbonell, MJ.; Coll Carrillo, H.; Serna Ros, P. (2016). Aprender de los errores. Una manera de adquirir responsabilidad ética, medioambiental y profesional. En In-Red 2016. II Congreso nacional de innovación educativa y docencia en red. Editorial Universitat Politècnica de València. https://doi.org/10.4995/INRED2016.2016.4366OC

Características mecánico-resistentes de hormigones fabricados con residuos siderúrgicos como conglomerantes y reducción de cemento

[ES] Uno de los principales problemas de la siderurgia en lo referente a la fabricación de acero, son los productos secundarios que se producen, provocando en los últimos años nuevos tipos de residuos industriales que, en función de la sostenibilidad del medio ambiente, son reutilizados o bien tratados. Este trabajo propone el análisis del comportamiento resistente de residuos en probetas de hormigón, como son polvos de humo provocados por hornos de arco eléctrico, cuando se produce la fusión de los materiales. Mediante la reducción de cemento y sustitución por este material, pueden tener una segunda vida en el mercado evitando que sean depositados en el vertedero.Parrón Rubio, ME.; Pérez García, F.; Contreras De Villar, F.; Rubio Cintas, MD.; Pelufo Carbonell, MJ. (2018). Características mecánico-resistentes de hormigones fabricados con residuos siderúrgicos como conglomerantes y reducción de cemento. En HAC 2018. V Congreso Iberoamericano de hormigón autocompactable y hormigones especiales. Editorial Universitat Politècnica de València. 525-534. https://doi.org/10.4995/HAC2018.2018.6127OCS52553

Structural behavior of self-compacting and fiber reinforced concrete under shear loading

p. 2920-2931Shear behavior of concrete elements made with traditional concrete (TC), self-compacting concrete (SCC) and fiber reinforced concrete (FRC) was analyzed. Three reinforced concrete beams were tested using three different kinds of concrete: TC, SCC and FRC, and two prestressed reinforced beams with SCC and FRC. Minimum traditional shear reinforcement was fixed so that a shear failure took place. Displacements, load and crack width were measured during the tests. Subsequently, the values obtained during the tests were analyzed by comparing the results of the different kinds of concrete. By means of video recording and subsequent image analysis, crack widths in beams were measured. Crack opening was controlled at the fixed control points. Shear experimental strength and behavior were compared. A safety margin was obtained for the analyzed cases.Cuenca, E.; Serna Ros, P.; Pelufo Carbonell, MJ. (2009). Structural behavior of self-compacting and fiber reinforced concrete under shear loading. Editorial Universitat Politècnica de València. http://hdl.handle.net/10251/665

Analysis of moisture state of recycled coarse aggregate and its influence on compression strength of the concrete

p. 2932-2940This article analyzes the impact of the moisture level of recycled coarse aggregate additions to concrete on its compression strength, with the goal of finding a logical development process that can be reproduced at an industrial level and provide acceptable results for concrete production. This study takes into account the reality in the process of the production of concrete; while many authors suggest the use of recycled coarse aggregates in a saturated state to ensure the desired ratio water to cement in the concrete, in reality, the aggregates are introduced unsaturated. The main objective of this study is to observe and analyze the behaviour of recycled coarse aggregate in concrete, so that it is not stigmatized by the extra work involved in its use. The concrete was produced using three states of the recycled coarse aggregates. In the first one, the aggregates were added in their natural state, taking into account the total water in the dosage; in the second one, aggregates were added after being submerged in water for 10 minutes and drained for 10 minutes; and in the last one, the aggregates were added in their natural state, taking into account its absorption when adding the water. In order to evaluate the recycled coarse aggregates¿ resistance to compression at 28 days, four percentages of replacement of the recycled coarse aggregates, 0%, 20%, 50% and 100% were established among the concretes studied. The study finds that to define the resistance of a concrete, the effective ratio of water to cement plays a very important role; basically, the high absorption of recycled aggregates directly affects the quality of the concrete. The results showed that the values of compressive strength increased as the replacement percentage of the recycled coarse aggregates increased when the aggregates were added in their natural state, not considering their absorption in the mixed water. The opposite result was obtained when the aggregates were added in saturated state, reflecting a significant decrease in the resistance of the concrete as the replacement percentage of recycled coarse aggregates increased.Pelufo Carbonell, MJ.; Domingo Cabo, A.; Ulloa Mayorga, VA.; Vergara Acuña, NN. (2009). Analysis of moisture state of recycled coarse aggregate and its influence on compression strength of the concrete. Editorial Universitat Politècnica de València. http://hdl.handle.net/10251/665

Model for the behavior of steel fibers reinforced concrete in plates elements

p. 2965-2981This article presents and develops a model for the behavior of steel fibers reinforced concrete (SFRC) for its use in plates elements. In order to carry out the present investigation, a series of laboratory tests were made for the mechanical characterization of SFRC. Additionally, a set of plates elements were tested in the laboratory of Construction Engineering at the Technical University of Valencia, with different fiber contents and load conditions. These plates elements were tested to their fracture, and the obtained results were verified experimentally with the implementation of the given model in a program of finite elements, where the tested plates were modelized. The obtained results show a satisfactory adjustment of the given model for its application in nonlinear calculation of plates elements made with steel fibers reinforced concrete.Lopez-Gayarre, F.; Lopez-Colina, C.; Lázaro Fernández, CM.; Pelufo Carbonell, MJ.; Domingo Cabo, A. (2009). Model for the behavior of steel fibers reinforced concrete in plates elements. Editorial Universitat Politècnica de València. http://hdl.handle.net/10251/670