Standard Method of Test for
Sampling Bituminous Paving Mixtures
AASHTO Designation: T 168-03 (2007)
ASTM Designation: D 979-01 (2006)e1
AASHTO T 168-03 (2007) is identical to ASTM D 979-01 (2006l 1 except for the following provisions:
1.All references to the ASTM standards listed in the following table, shall be replaced with the )
corresponding AASHTO standard:
Referenced Standard
ASTM AASHTO
C702 T248
2.Insert an additional section between Sections 4.1.1 and 4.1.2 containing the following:
Care shall be taken in sampling to avoid segregation of coarse aggregate and asphalt mortar.
Care shall be taken also to prevent contamination by dust or other foreign matter.
3.Insert new Sections 5.2.3.3, 5.2.3.4 and 5.2.3.5 after Section 5.2.3.2 as follows:
5.2.3.3 If the mixture is in a windrow (cold mix), random samples of the windrow at intervals ofnot more than 150 m (500 ft) shall be secured and tested separately. Samples of the
windrow shall be secured by flattening it at one point into a layer of approximately 0.3 m
(1 ft) thick and coring this layer at three or more random points to obtain the required sample
size as shown in Table 1.
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