Identidad deportiva en chile: Un proceso sociocultural y material marcado por el estado y el neoliberalismo

Indexación: Scopus.The construction of athlete identity is an interesting topic in the field of sociocultural studies of sport. The objective of this study was to analyze the athlete identity construction of the Chilean athletes to gain comprehension on this topic. Through a qualitative study, 17 semi-structured interviews were developed with high performance and recreative athletes from conventional and adapted modalities. The results show that there are two categories to construct Chilean sports identity: sociocultural conditions and material conditions, which are marked by neoliberal logics and values. We conclude by expressing that gender is a dimension that generate alternative discourses to dispute individualism and competition as present values ​in Chilean athlete identity.https://seer.ufrgs.br/Movimento/article/view/10053

Study of the mechanical behavior of asphalt mixtures using fractional rheology to model their viscoelasticity

This study focuses on the mechanical behavior of asphalt mixtures composed of aggregate particles attached with an asphalt binder. Asphalt mixtures are viscoelastic composite materials widely used in the construction of pavement layers. The modelling of such materials is currently done using the Burgers model. However, this model is limited when explaining some of the viscoelastic phenomena of an asphalt mixture, mainly because the Burgers model was developed for a single material with a dual nature. This work presents a new approach that provides a more appropriate framework for studying asphalt mixtures. The model assumes an aggregate particle enclosed by an asphalt material. Viscoelastic equations were developed using derivatives of fractional order. Then, the creep, recovery, and relaxation phenomena in an asphalt mixture were analyzed using the new model. Unlike the Burgers model, the new model can predict the elastic jump observed at the beginning of the creep modulus. Thus, the new model seems to describe better those practical cases of asphalt mixtures used in the construction of pavement layers. The new model can be used to modify the properties of the binder for designing optimized and more resistant asphalt mixtures

A922 Sequential measurement of 1 hour creatinine clearance (1-CRCL) in critically ill patients at risk of acute kidney injury (AKI)

Meeting abstrac

Influence of limestone filler on the rheological properties of bituminous mastics through susceptibility master curves

Fuente: Construction and Building Materials[EN] Temperature variations caused by seasonal changes and vehicle loads generate severe damage to asphalt layers. For a correct design, it is essential to carry out an adequate rheological characterization of both bitumen and bituminous mastic, since they are considered the weakest elements of the mixture. This article shows the results of the rheological behavior of mastics made of limestone filler and three types of binders, with a filler-bitumen ratio of 1/1, finding that the filler-bitumen interaction has a significant influence on asphalt mastics. Vehicle loads and climatic temperatures were simulated from MSCR and DSR tests to study the viscoelastic behavior of the bitumen and the mastic. Thus, stiffness, variation of the internal structure, viscosity, thermal susceptibility, permanent deformation, and cracking were determined. The results indicated that the filler causes an increase in the rigidity of the mastic for the whole range of temperatures and load frequencies, but this increase varies depending on the type of bitumen used. There is also no significant change in the phase angle variation between bitumens and mastics. This indicates that the bitumens maintain their internal structure when the filler is added, as well as considerably decreasing the accumulated strain in multiple stress creep recovery (MSCR) tests

Rheological analyses of binders modified with triple combinations of Crumb-Rubber, Sasobit and Styrene-Butadiene-Styrene

The development of polymer-modified asphalt (PMA) has been a widely used technique by many researchers. Moreover, further modification of PMA binders has generated interest due to possible improvements in performance and cost. In this regard, Sasobit wax has been an alternative to reduce costs in Crumb-Rubber (CR) and Styrene-Butadiene-Styrene Copolymer (SBS) binders. However, there is little detail on the rheological behaviour of CR-SBS-Sasobit triple-modified samples for failure and damage resistance properties. Therefore, this study shows various properties of binders with triple modification of CR-SBS-Sasobit at different dosages. For this purpose, the development of single, double and triple modifications has been proposed to be tested by Multiple Stress Creep Recovery (MSCR) for permanent deformation. In the case of radial cracking and thermal cracking, it is evaluated by linear amplitude sweep test (LAS) and binder creep energy test (BYET). The results indicate that a CR-SBS combination in single or double addition achieves good thermal stability and behaviour. However, a higher elasticity is achieved in the case of a triple modification with CR-SBS-Sasobit. Specifically, Sasobit achieves 67% and 28% reduction in the cumulative deformation of MSCR for a variation of 40–80 °C, respectively. Concerning fatigue life (Nf), it is shown that CR-SBS modifications do not always acquire higher Nf than single modifications. However, adding Sasobit in triple modifications increases these values, generating bitumen with higher strength. It is also shown that adding Sasobit is a viable modifier in yield, even increasing the yield energy (Er) for samples with equal CR-SBS and reducing the percentage of SBS in the sample

Viscoelasticity modelling of asphalt mastics under permanent deformation through the use of fractional calculus

Fuente: Construction and Building Materials[EN] asphalt bitumens. Asphalt mastics are viscoelastic composite materials widely used in the construction of pavement layers. The mechanical properties and the influence of the fillers on the filler/bitumen (f/b) matrix is one of the main areas of current research. In particular, the elastic determination of fillers for mechanical testing in asphalt mastic is relevant to understand permanent deformation caused by temperature variations caused by seasonal changes and vehicular traffic loads. In this sense, this research proposes a new methodology for rheological characterization of the elastic properties of the filler ξ2 and elastic-viscous properties of the asphalt bitumen, ξ1 and η, respectively, complementing the existing designs of asphalt mixture. The proposed methodology allows for identification of the influence of non-conventional fillers in the behavior of the asphalt mastic for the different recovery cycles of the Multiple Stress Creep Recovery (MSCR) and determination of new rheological parameters for the compression of the recovery phenomena and the elastic capacity of the type of filler and weight of the base bitumen. The results obtained show a greater adjustment to the experimental curves in determining the elastic modulus in each cycle for the hydrated lime and fly ash fillers with different filler/ bitumen ratios. In particular, the proposed model for bituminous mastics achieves a strong fit with the experimental curves by empirically reducing the quadratic error (R2 = 0.99) and managing to differentiate the elastic capacity ξ2 of each filler and its effect with increasing concentration. For example, it establishes that the Hydrated lime filler (HL) acquires an average Young’s modulus of 0.005 MPa, being 99.31% more elastic than Fly ash filler (FA) for a load of 3.2 kPa at a 1.25f/b ratio. In addition, the new model can be used to modify bitumen properties to design optimized and stronger asphalt mixtures.ANID, Agencia Nacional de Investigación y Desarrollo de Chil