Standard Test Method for Determination of Rutting Tolerance Index of Asphalt Mixture Using the Ideal Rutting Test

Importancia y uso:

5.1 The ideal rutting test (IRT) is used to determine asphalt mixture rutting resistance at high temperature in the range of 50 ± 15 °C, depending on local climate. The specimens are readily obtained from Superpave Gyratory Compactor (SGC) compacted cylinders with a diameter of 150 ± 2 mm, with no cutting, gluing, drilling, or instrumentation required. Similarly, field cores with a diameter of 150 ± 2 mm can be tested to measure rutting resistance of in-place asphalt mixtures.

Note 1: Field cores may need cutting to a right thickness ranging from 38 mm to 95 mm. This test standard is not applicable to the specimens with a diameter other than 150 ± 2 mm, regardless of laboratory-compacted specimens or field cores.

5.2 The RT_Index of an asphalt mixture is calculated from the peak load (or shear strength). The RT_Index is a performance indicator of the rutting resistance of asphalt mixtures containing various asphalt binders, asphalt binder modifiers and additives, aggregate blends, fibers, and recycled materials. Generally, the higher the RT_Index value, the better the rutting resistance and consequently the smaller the rut depth in the field. Users can employ the RT_Index and associated criteria to identify rutting-prone mixtures during mix design and production quality control/assurance.

Note 2: The quality of the results produced by this standard are dependent on the competence of the personnel performing the procedure and the capability, calibration, and maintenance of the equipment used. Agencies that meet the criteria of Specification D3666 are generally considered capable of competent and objective testing, sampling, inspection, etc. Users of this standard are cautioned that compliance with Specification D3666 alone does not completely ensure reliable results. Reliable results depend on many factors; following the suggestions of Specification D3666 or some similar acceptable guideline provides a means of evaluating and controlling some of those factors.

Subcomité:

D04.26

Volúmen:

04.03

Número ICS:

93.080.20 (Road construction materials)

Palabras clave:

asphalt mixture rutting resistance; ideal rutting test; rutting tolerance index;