ASTM D6752-02

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
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Designation: D 6752 – 02
Standard Test Method for
Bulk Specific Gravity and Density of Compacted Bituminous
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Mixtures Using Automatic Vacuum Sealing Method
This standard is issued under the fixed designation D 6752; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of 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. Scope conversion is made by multiplying the specific gravity at a
given temperature by the density of water at the same tempera-
1.1 This test method covers the determination of maximum
ture.
specific gravity of loose bituminous mixtures by the vacuum
3.3 This method can be used for 100 mm and 150 mm
sealing method.
diameter cylindrical as well as cubical asphalt specimens to
1.2 This method can be used for compacted cylindrical and
correct for absorptive and open graded mixes. Mixes such as
cubical bituminous laboratory and field specimens.
Stone Matrix Asphalt (SMA), porous friction coarse, and
1.3 The bulk specific gravity of the compacted bituminous
Superpave coarse graded mixes with significant surface texture
mixtures may be used in calculating the unit weight of the
and interconnected voids should be sealed for accurate bulk
mixture.
specific density results. Follow manufacturer recommendation
1.4 This standard does not purport to address all of the
for appropriate bag sizes to be utilized with cubical and
safety concerns, if any, associated with its use. It is the
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abnormally shaped samples.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
4. Apparatus
bility of regulatory requirements prior to use.
4.1 Balance, with ample capacity, and with sufficient sensi-
2. Referenced Documents tivity to enable bulk specific gravity of specimens to be
calculated to at least four significant figures, that is to at least
2.1 ASTM Standards:
2 three decimal places. It shall be equipped with a suitable
D 979 Practice for Sampling Bituminous Paving Mixtures
apparatus to permit weighing the specimen while it is sus-
D 1461 Test Method for Moisture or Volatile Distillates in
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pended in water. The balance shall conform to Specification
Bituminous Paving Mixtures
D 4753 as a class GP2 balance.
D 2726 Test Method for Bulk Specific Gravity and Density
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of Non-Absorptive Compacted Bituminous Mixtures
NOTE 1—Since there are no more significant figures in the quotient
D 3203 Test Method for Percent Air Voids in Compacted (bulk specific gravity) than appear in either the dividend (the mass of the
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specimen in air) or in the divisor (the volume of the specimen, obtained
Dense and Open Bituminous Paving Mixtures
from the difference in mass of the specimen in air and in water), this
D 4753 Specification for Evaluating, Selecting and Speci-
means that the balance must have a sensitivity capable of providing both
fying Balances and Scales for Use in Soil, Rock, and
mass and volume values to at least four figures. For example, a sensitivity
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Construction Materials Testing
of 0.1 g would provide four significant figures for the determination of a
mass in the range from 130.0 to 999.9 g when the specific gravity is 2.300.
3. Significance and Use
4.2 Water Bath, with minimum dimensions (Length 3
3.1 The results obtained from this method can be used to
Width 3 Depth) of 610 3 460 3 460 mm (24 3 18 3 18 in.)
determine the unit weight of compacted bituminous mixtures
or a large cylindrical container, for completely submerging the
and in conjunction with Test Method D 3203, to obtain percent
specimen in water while suspended, equipped with an overflow
air voids. These values in turn may be used in determining the
outlet for maintaining a constant water level.
relative degree of compaction.
3.2 Since specific gravity has no units, it must be converted NOTE 2—It is preferable to keep the water temperature constant by
using a temperature controlled heater. Also, to reduce the chance for the
to density in order to do calculations that require units. This
1 4
This test method is under the jurisdiction of ASTM Committee D04 on Road Bulk specific gravity determined by this method may be lower than the results
and Paving Materials and is the direct responsibility of Subcommittee D04.21 on obtained by Test Method D 2726. As a result, air voids determined from these bulk
Specific Gravity and Density of Bituminous Mixtures. specific gravity values may be higher than the air voids values determined using Test
Current edition approved Jan. 10, 2002. Published March 2002. Originally Method D 2726. These differences may be more pronounced for coarse aggregate
published as PS 131–01. Last previous edition PS 131–01. mixtur
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