1. Scope
This Standard describes the test method for measuring dynamic modulus of bituminous mixtures using the indirect tension testing method. This method is intended for dense or gap-graded mixtures with nominal maximum aggregate sizes of up to 25mm. It will also be useful for the evaluation of cores of bituminous mixtures collected from the roadway.
Recently, a significant amount of effort has been given to the development of test protocols to determine the dynamic modulus of hot mix asphalt and other bituminous paving materials. This effort has resulted in a test protocol that calls for the use of axial compression. Axial compression testing requires the use of 100mm diameter and 150mm tall specimens. When conducting pavement forensic studies or rehabilitation designs, this sample size can be problematic. This standard will allow the user to generate dynamic modulus data using the indirect tensile (IDT) mode from road cores which are typically less than a 75 mm in height.
Keywords
Phase Angle, Master Curve, shift factor, viscoelastic, axial compression, time-temperature superposition
The title and scope are in draft form and are under development within this ASTM Committee.
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