Interaction nonlinearity in asphalt binders |
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Authors: | Arash Motamed Amit Bhasin Kenneth M Liechti |
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Affiliation: | (1) Facultad de Ciencias Experimentales, Departamento de Ingenier?a Qu?mica, Universidad de Huelva, Campus del Carmen, 21071 Huelva, Spain;(2) Chemical Engineering Department, Instituto Superior T?cnico, Av. Rovisco Pais, 1049-001 Lisbon, Portugal;(3) Materials Engineering Department, Instituto Superior T?cnico, Av. Rovisco Pais, 1049-001 Lisbon, Portugal |
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Abstract: | Asphalt mixtures are complex composites that comprise aggregate, asphalt binder, and air. Several research studies have shown
that the mechanical behavior of the asphalt mixture is strongly influenced by the matrix, i.e. the asphalt binder. Characterization
and a thorough understanding of the binder behavior is the first and crucial step towards developing an accurate constitutive
model for the composite. Accurate constitutive models for the constituent materials are critical to ensure accurate performance
predictions at a material and structural level using micromechanics. This paper presents the findings from a systematic investigation
into the nature of the linear and nonlinear response of asphalt binders subjected to different types of loading using the
Dynamic Shear Rheometer (DSR). Laboratory test data show that a compressive normal force is generated in an axially constrained
specimen subjected to torsional shear. This paper investigates the source of this normal force and demonstrates that the asphalt
binder can dilate when subjected to shear loads. This paper also presents the findings from a study conducted to investigate
the source of the nonlinearity in the asphalt binder. Test results demonstrate that the application of cyclic shear loads
results in the development of a normal force and a concomitant reduction in the dynamic shear modulus. This form of nonlinear
response is referred to as an “interaction nonlinearity”. A combination of experimental and analytical tools is used to demonstrate
and verify the presence of this interaction nonlinearity in asphalt binders. The findings from this study highlight the importance
of modeling the mechanical behavior of asphalt binders based on the overall stress state of the material. |
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