ASTM D5821-95

NOTICE: This standard has either been superseded and replaced by a new version or
withdrawn. Contact ASTM International (www.astm.org) for the latest information.
Designation: D 5821 – 95
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Test Method for
Determining the Percentage of Fractured Particles in Coarse
1
Aggregate
This standard is issued under the fixed designation D 5821; 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
1.1 This test method covers the determination of the per-
centage, by mass or by count, of a coarse aggregate sample that
consists of fractured particles meeting specified requirements.
1.2 The values stated in SI units are to be regarded as the
standard. The values in parentheses are provided for informa-
tion only.
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 appro-
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards:
C 136 Test Method for Sieve Analysis of Fine and Coarse
FIG. 1 Schematic of a Fractured Particle with One Fractured Face
2
Aggregates
C 702 Practice for Reducing Field Samples of Aggregate to
2
Testing Size
least the minimum number of fractured faces specified (usually
D 8 Terminology Relating to Materials for Roads and Pave-
one or two).
3
ments
3
4. Significance and Use
D 75 Practice for Sampling Aggregates
E 11 Specification for Wire-Cloth Sieves for Testing Pur-
4.1 Some specifications contain requirements relating to
4
poses
percentage of fractured particles in coarse aggregates. One
purpose of such requirements is to maximize shear strength by
3. Terminology
increasing inter-particle friction in either bound or unbound
3.1 Definitions:
aggregate mixtures. Another purpose is to provide stability for
3.1.1 fractured face, n—an angular, rough, or broken sur-
surface treatment aggregates and to provide increased friction
face of an aggregate particle created by crushing, by other
and texture for aggregates used in pavement surface courses.
artificial means, or by nature (see Terminology D 8).
This test method provides a standard procedure for determining
3.1.1.1 Discussion—for this standard, a face will be con-
the acceptability of coarse aggregate with respect to such
sidered a “fractured face” only if it has a projected area at least
requirements.
as large as one quarter of the maximum projected area
4.2 Specifications differ as to the number of fractured faces
(maximum cross-sectional area) of the particle and the face has
required on a fractured particle, and they also differ as to
sharp and well defined edges; this excludes small nicks. See
whether percentage by mass or percentage by particle count
Fig. 1.
shall be used. If the specification does not specify, use the
3.1.2 fractured particle, n—a particle of aggregate having at
criterion of at least one fractured face and calculate percentage
by mass.
1
This test method is under the jurisdiction of ASTM Committee D-4 on Road
5. Apparatus
and Paving Materials and is the direct responsibility of Subcommittee D04.51 on
Aggregate Tests.
5.1 Balance—A balance or scale accurate and readable to
Current edition approved Nov. 10, 1995. Published January 1996.
within 0.1 % of the test sample mass at any point within the
2
Annual Book of ASTM Standards, Vol 04.02.
3
range of use.
Annual Book of ASTM Standards, Vol 04.03.
4
Annual Book of ASTM Standards, Vol 14.02. 5.2 Sieves—Sieves conforming to Specification E 11.
1

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D 5821
5.3 Splitter—A sample splitter suitable for dividing field has the required number of fractured faces, (2) particles not
samples into test portion sizes in accordance with Practice meeting the specified criteria, and (3) questionable or border-
C 702. line particles. If the required number of fractured faces is not
5.4 Spatula—A spatula or similar tool to aid in sorting given in the applicable specifications, the determination will be
aggregate particles. made on the basis of a minimum of one fractured face.
8.4 Determine the mass or count of particles in the fractured
6. Sampling
particle category, the mass or count of the questionable
6.1 Sample the aggregate in accordance with Practice D 75. particles, and the mass or count of the particles not meeting the
specified fracture criteria. Use mass to calculate percent
7. Sample Preparation
fractured particles unless percentage by particle count is
specified.
7.1 Dry the sample sufficiently to obtain a clean sepa
...