ASTM D5148−10 Standard Test Method for Centrifuge Kerosine Equivalent

ASTM D5148−10 Standard Test Method for Centrifuge Kerosine Equivalent

Scope
1.1 This test method determines the centrifuge kerosine equivalent (CKE) of aggregate used in bituminous mixtures.
1.2 Units of Measure:
1.2.1 The values stated in inch-pound units are to be regarded as standard.

The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

An exception is made in the values used for mass because this standard was originally developed using even values of grams, and use of ounces as a standard would make those measures cumbersome.

1.2.2 Regarding sieves, per ASTM Specification E11 Section 1.2, “the values stated in SI units shall be considered standard for the dimensions of the wire cloth openings and the diameter of the wires used in the wire cloth.

The values stated in inch pound units shall be considered standard with regard to the sieve frames.”

When sieve mesh sizes are referenced, the alternate inch-pound designations are provided for information purposes and enclosed in parentheses.

ASTM D5148−10 Standard Test Method for Centrifuge Kerosine Equivalent

Significance and Use
4.1 The CKE furnishes an index, designated as the K factor, that indicates the aggregate particle roughness and surface capacity based on porosity.

4.2 The CKE is used as part of the Hveem mix design procedure to determine the approximate bitumen ratio (ABR), as shown in Appendix X1.

However, there are other applications such as determining the coarse aggregate fraction constant (Kc) for use as an aid in selecting a bitumen content for open-graded friction courses.