Standard Practice for
Preparation of Test Specimens of Bituminous Mixtures by
Means of Gyratory Shear Compactor1
This standard is issued under the fixed designation D 4013; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of the last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1.1 This practice covers the preparation of 10 cm or 4 in.
diameter test specimens of bituminous mixtures
containing − 22.4-mm (−7⁄8-in.) aggregate.
1.2 The values stated in SI units are to be regarded as
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards:
E 4 Practices for Load Verification of Testing Machines2
3. Summary of Practice
3.1 This practice employs gyratory-shearing action of the
the mixture at low initial pressures, allowing orientation of the
aggregate particles to aid compaction, and then nongyratory
compression at high pressure for consolidation and shaping.
4. Significance and Use
4.1 The specimens are compacted to simulate the density,
aggregate degradation, and structural characteristics possible in
the actual road surface when proper construction procedure is
used in the placement of the material. The specimens may be
used to determine stability, density, strength, water susceptibility, etc., of bituminous mixtures by specified test methods.
5.1 Gyratory-Shear Molding Press:
5.1.1 Press Platen, which is hardened and ground flat.
5.1.2 Hydraulic Compaction Ram, with a nonrotating metal
face as shown in Fig. 1 and Fig. 2. The ram face is hardened
and ground flat. The ram varies the vertical opening between
the ram face and the press platen from + 11 cm (4.5 in.) down
to less than 2.5 cm (1.0 in.).
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