Modelación y análisis de susceptibilidad a la deformación permanente de mezclas asfálticas * Universidad EAFIT, Medellín. COLOMBIA Resumen La deformación permanente de mezclas asfálticas del Área Metropolitana del Valle de Aburra -Antioquia, las cuales se fabrican en nuestro medio bajo las especificaciones INVIAS (Instituto Nacional de Vías) y del Valle de Aburrá, se estudiaron utilizando un modelo constitutivo propuesto anteriormente.Este modelo mostró previamente ser efectivo en predecir la deformación de mezclas asfálticas en el Reino Unido bajo diferentes tipos de carga bajo condiciones uniaxiales y triaxiales, y temperaturas comprendidas entre 0 ºC y 40 ºC. Para el caso de las mezclas del Valle de Aburrá se emplearon temperaturas en un intervalo de 20 ºC a 50 ºC y se implementó el modelo propuesto con el fin de predecir la susceptibilidad a la deformación permanente. Mediante el estudio experimental de las mezclas se encontró que el comportamiento de estado estable de estas siguió el modelo modificado de Cross 2 (Wang, 2011), con las mezclas exhibiendo comportamiento viscoso lineal y no-lineal a bajos y altos niveles de esfuerzos, respectivamente. Tanto para condiciones de carga como de recuperación se observó una dependencia de la temperatura en el material que fue adecuadamente predicha por el modelo de Arrhenius 3 bajo el intervalo de temperaturas estudiado. Al realizar la modelación del comportamiento de las mezclas se encontró que el modelo propuesto por Ossa et al. (2010) aplica a las mezclas estudiadas y se determinó que la susceptibilidad a la deformación de estas varía considerablemente dependiendo de los materiales utilizados por el productor y en especial el agregado empleado, a pesar de ser mezclas teóricamente similares.Palabras Clave: Asfalto, mezclas asfálticas, deformación permanente, recuperación, pruebas cíclicas Abstract Permanent deformation of asphaltic mixtures in the Metropolitan Area of Valle de Aburra -Antioquia, which are built under IVIAS' specifications (Instituto Nacional de Vías) and Valle de Aburrá, were studied by employing a constitutive model proposed previously. This model had proved to be effective in predicting deformations of asphaltic mixtures in the United Kingdom under different kinds of loads; under uniaxial and triaxial conditions and temperatures at intervals between 0 ºC and 40 ºC. For the specific case of Valle de Aburra, temperatures ranged between 20 ºC and 50 ºC and the model was implemented in order to predict susceptibility to permanent deformation. By means of an experimental study on mixtures, it was found that their behavior under steady state condition followed the model modified by Cross 2 , thus mixtures showed a visco-linear and non-linear behavior at low and high stress levels, respectively.It was observed that under loading and unloading conditions, there is a temperature dependence on the material behavior, which was properly predicted by Arrhenius 3 under the studied temperatures interval. When modeling mixtures behavior, it was found that that t...
L'agora de la traduction Volume 3, numéro 1, 1er semestre 1990 URI : id.erudit.org/iderudit/037057ar
This chapter reflects on the role of accelerator programmes and entrepreneurship training in fostering the emergence of collaborative economy projects. More specifically it interrogates the mechanisms enabling a process usually criticised for (re)producing capitalism to produce other understandings and practices of the economy. It uses the example of Barcelona’s La Comunificadora accelerator program. Instead of reinforcing capitalist understandings of the economy and a model of entrepreneurship tied to it, it can be the site of producing a diverse economy (Gibson-Graham 2006), thanks to a politics of language, of the subject and of collective action. Through the values conveyed by the teaching team, participants can resignify and reappropriate a series of notions, such as community. This reframing process is also that of themselves as an ongoing process. Nonetheless, resistances and non-recognitions of the framework presented to the participants, coupled to the precarious conditions of existence of the programme, limit the possibility of transformation of the individuals and of the projects. There is no singular outcome but rather a variety of paths taken.
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