Examinando por Materia "Mechanical agitation at high revolutions"

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    Indentación esférica en asfaltos envejecidos
    (Universidad EAFIT, 2022) D paola Puche, Plinio; Vidal Valencia, Julián
    Permanent deformation is one of the most frequent failures produced in the asphalt pavement, mainly in heavy and low-speed traffic lanes. Predicting this type of defect is made difficult by the high complexity of asphalt, since it is a thermoplastic material that exhibits linear viscoelastic behavior at low loads and nonlinear viscoelastic behavior at high loads. Its behavior also varies due to oxidative aging, produced by environmental effects throughout its useful life, which makes its prediction more complicated. The tests used for its analysis are highly expensive and often require a large number of destructive laboratory tests, which sometimes fail to reproduce the same environmental and support conditions of the tracks. In this work, it is proposed to use the spherical indentation method, for asphalts aged by the mechanical agitation test at high revolutions, which are economic tests that use easily accessible equipment for any pavement laboratory, such as the manual penetrometer (previously established for spherical indentation calculations) and a conventional double helix mechanical stirrer (used in the oxidative aging process). This method was used in a conventional asphalt AC 60-70, aged in times of 30 min, 1 hour, 1.5 hours, 2 hours, 2.5 hours and 3 hours, in order to determine the variation of its properties as it increases. the effect of aging.