ASTM D6931−12 Standard Test Method for Indirect Tensile IDT Strength of Bituminous Mixtures

ASTM D6931−12 Standard Test Method for Indirect Tensile IDT Strength of Bituminous Mixtures

Scope
1.1 This test method covers procedures for preparing and testing laboratory-fabricated or field-recovered cores of bituminous mixtures to determine the Indirect Tensile (IDT) Strength.

1.2 The within-laboratory repeatability standard deviation, for the recommended rate of loading (50 mm/min) and test temperature (25ºC), has been determined to be 80 kPa for 101.6 mm diameter specimens, based on 28 labs using either 2 or 4 test replicates with 11 different mix samples.

Additional data is provided in Table for the user’s information.

The between-laboratory reproducibility of this test method is being determined and will be available on or before August 2012.

Therefore, this test method should not be used for acceptance or rejection of materials for purchasing purposes. 1.3 The values stated in SI units are to be regarded as standard

ASTM D6931−12 Standard Test Method for Indirect Tensile IDT Strength of Bituminous Mixtures

Significance and Use
4.1 The values of IDT strength may be used to evaluate the relative quality of bituminous mixtures in conjunction with laboratory mix design testing and for estimating the potential for rutting or cracking.

The results can also be used to determine the potential for field pavement moisture damage when results are obtained on both moisture-conditioned and unconditioned specimens.