Examinando por Materia "Cyclic tests"

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    Modeling and analysis of susceptibility to permanent deformation in asphalt mixtures
    (Pontificia Universidad Católica de Chile, 2011-01-01) Julián Vidal V.; Ossa A.; Julián Vidal V.; Ossa A.; Universidad EAFIT. Departamento de Ingeniería de Producción; Materiales de Ingeniería
    Perm. Deformation of Asphaltic Mixtures in the Metropol. Area of Valle de Aburra - Antioquia, Which Are Built under IVIAS' Specifications and Valle de Aburra, Were Studied by Employing A Constitutive Model Proposed Previously. This Model Had Proved to Be Effective in Predicting Deformations of Asphaltic Mixtures in the U. Kingdom under Different Kinds of Loads; under Uniaxial and Triaxial Conditions and Temperatures at Intervals between 0C and 40C. for the Specific Case of Valle de Aburra, Temperatures Ranged between 20C and 50C and the Model Was Implemented in Order to Predict Susceptibility to Perm. Deformation. by Means of An Exp. Stud. on Mixtures, It Was Found That Their Behav. under Steady State Condition Followed the Model Modified by Cross2, Thus Mixtures Showed A Visco-Lin. and Non-Lin. Behav. at Low and High Stress Levels, Respectively. It Was Observed That under Loading and Unloading Conditions, There Is A Temp. Dependence on the Mat. Behav., Which Was Properly Predicted by Arrhenius3 under the Studied Temperatures Interval. When Modeling Mixtures Behav., It Was Found That That Their Strain Susceptibility Varied Widely Depending on the Constituent Mat., Especially on the Aggregate, in Spite of the Fact That the Mixtures Are Similar.
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    Triaxial deformation behavior of bituminous mixes
    (ASCE-AMER SOC CIVIL ENGINEERS, 2010-02-01) Ossa, E. A.; Deshpande, V. S.; Cebon, D.; Ossa, E. A.; Deshpande, V. S.; Cebon, D.; Universidad EAFIT. Departamento de Ingeniería de Producción; Materiales de Ingeniería
    The triaxial compressive response of bituminous mixes with volume fractions of aggregate in the range 52 to 85% was investigated over a wide range stresses and strain rates. The types of loadings considered include triaxial monotonic constant stress and constant applied strain rate, as well as creep recovery, continuous cyclic, and stress pulse train loadings. The mixes with a "fully dense" aggregate skeleton were found to dilate under all loading conditions and the creep response of the mixes was dependent on both the deviatoric and hydrostatic stresses. By contrast, recovery was found to occur under zero applied deviatoric stresses with the recovery rate only dependent on the "recoverable strain" and independent of any superimposed hydrostatic stress. Continuous and pulse loading cyclic stress-controlled tests showed that the response of the mixes was governed by the mean applied deviatoric stress in the continuous cyclic tests while strain recovery was important in the pulse loading tests. A phenomenological constitutive model was proposed to fit the measured triaxial response of the bituminous mixes and shown to capture the measurements over all the triaxial stress states and loading time histories investigated here. Furthermore, the model was extended to capture the temperature dependence of the mixtures which is governed by the temperature dependence of the bitumen binder. © 2010 ASCE.