Abstract
In the presented research, conventional cyclic tension–compression complex modulus tests and dynamic tests were performed on an asphalt mix (AM) specimen. For the tension–compression tests, the complex modulus was calculated from the measurements of the axial strain and axial stress. For the dynamic tests, an automated impact hammer equipped with a load cell and an accelerometer were used to determine the frequency response functions (FRFs) at five different temperatures. A back-analysis using finite element method (FEM) calculations and a very simple modelling of the material behaviour was proposed to determine the complex modulus of the specimen at each tested temperature. Complex modulus results from dynamic and cyclic tests were compared and are in good agreement. The norm of the complex modulus obtained from dynamic test is slightly higher and no significant difference is seen for the phase angle. Part of the differences observed may be explained by the nonlinearity of AM (strain amplitude is about 500 times smaller for dynamic tests).
Highlights
Asphalt mixes (AM) have a linear viscoelastic (LVE) behaviour in the small strain domain [1]
The accuracy of the proposed approach is evaluated by comparing the results obtained from dynamic tests with results obtained from more conventional cyclic tension-compression tests
The experimental measurements from dynamic tests were back-analysed with a simple procedure to determine one value of the complex modulus at the first resonance frequency for each tested temperature
Summary
Asphalt mixes (AM) have a linear viscoelastic (LVE) behaviour in the small strain domain [1] Their properties are strongly dependent on frequency and temperature and the maximum ratio of modulus values can be up to one thousand. Non-destructive dynamic tests are an economic alternative They are simple to perform and possibly adaptable for measurements on pavement structures. In the case of LVE materials, dynamic tests could be a great alternative to conventional cyclic tension–compression tests. The possibility of using a simple approach using finite element calculations to obtain the complex modulus of the material at each temperature from FRFs measurements is studied. Dynamic tests are introduced and the proposed approach to back-analyse the dynamic measurements is explained. Complex modulus data from tension–compression tests are compared with complex modulus results obtained with the proposed back-analysis of the dynamic tests
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