Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use as a Mineral Admixture in Concrete

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1.1 This specification covers coal fly ash and raw or calcined natural pozzolan for use as a mineral admixture in concrete where cementitious or pozzolanic action, or both, is desired, or where other properties normally attributed to finely divided mineral admixtures may be desired, or where both objectives are to be achieved.
Note 1—Finely divided materials may tend to reduce the entrained air content of concrete. Hence, if a mineral admixture is added to any concrete for which entrainment of air is specified, provision should be made to ensure that the specified air content is maintained by air content tests and by use of additional air-entraining admixture or use of an air-entraining admixture in combination with air-entraining hydraulic cement.
1.2 The values stated in SI units are to be regarded as the standard.
1.3 The text of this standard references notes and footnotes, which provide explanatory information. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard.

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ASTM C618-00 - Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use as a Mineral Admixture in Concrete
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NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: C 618 – 00
Standard Specification for
Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use
1
as a Mineral Admixture in Concrete
This standard is issued under the fixed designation C 618; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope transported by flue gasses.
1.1 This specification covers coal fly ash and raw or
NOTE 2—This definition of fly ash does not include, among other
calcined natural pozzolan for use as a mineral admixture in
things, the residue resulting from: (1) the burning of municipal garbage or
any other refuse with coal; (2) the injection of lime directly into the boiler
concrete where cementitious or pozzolanic action, or both, is
for sulfur removal; or (3) the burning of industrial or municipal garbage
desired, or where other properties normally attributed to finely
in incinerators commonly known as “incinerator ash.”
divided mineral admixtures may be desired, or where both
objectives are to be achieved.
4. Classification
NOTE 1—Finely divided materials may tend to reduce the entrained air
4.1 Class N—Raw or calcined natural pozzolans that com-
content of concrete. Hence, if a mineral admixture is added to any
ply with the applicable requirements for the class as given
concrete for which entrainment of air is specified, provision should be
herein, such as some diatomaceous earths; opaline cherts and
made to ensure that the specified air content is maintained by air content
shales; tuffs and volcanic ashes or pumicites, calcined or
tests and by use of additional air-entraining admixture or use of an
uncalcined; and various materials requiring calcination to
air-entraining admixture in combination with air-entraining hydraulic
induce satisfactory properties, such as some clays and shales.
cement.
4.2 Class F—Fly ash normally produced from burning
1.2 The values stated in SI units are to be regarded as the
anthracite or bituminous coal that meets the applicable require-
standard.
ments for this class as given herein. This class fly ash has
1.3 The text of this standard references notes and footnotes,
pozzolanic properties.
which provide explanatory information. These notes and foot-
4.3 Class C—Fly ash normally produced from lignite or
notes (excluding those in tables and figures) shall not be
subbituminous coal that meets the applicable requirements for
considered as requirements of the standard.
this class as given herein. This class of fly ash, in addition to
having pozzolanic properties, also has some cementitious
2. Referenced Documents
properties.
2.1 ASTM Standards:
C 125 Standard Terminology Relating to Concrete and Con-
NOTE 3—Some Class C fly ashes may contain lime contents higher than
2
10 %.
crete Aggregates
C 311 Test Methods for Sampling and Testing Fly Ash or
5. Ordering Information
Natural Pozzolans for Use as a Mineral Admixture in
2
5.1 The purchaser shall specify any supplementary optional
Portland-Cement Concrete
chemical or physical requirements.
3. Terminology
5.2 The purchaser shall indicate which procedure, A or B,
shall be used when specifying requirements for effectiveness in
3.1 Definitions:
contribution to sulfate resistance under Table 4.
3.1.1 The terms used in this specification are defined in
Terminology C 125.
6. Chemical Composition
3.1.2 fly ash—the finely divided residue that results from
6.1 Fly ash and natural pozzolans shall conform to the
the combustion of ground or powdered coal and that is
requirements as to chemical composition prescribed in Table 1.
Supplementary optional chemical requirements are shown in
1
Table 2.
This specification is under the jurisdiction of ASTM Committee C09 on
Concrete and Concrete Aggregates and is the direct responsibility of Subcommittee
C09.24 on Ground Slag and Pozzolonic Admixtures.
7. Physical Properties
Current edition approved Aug. 10, 2000. Published September 2000. Originally
7.1 Fly ash and natural pozzolans shall conform to the
published as C618 – 68 T to replace C350 and C402. Last previous edition
physical requirements prescribed in Table 3. Supplementary
C618 – 99.
2
Annual Book of ASTM Standards, Vol 04.02.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
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C 618
optional physical requirements are shown in Table 4. 11. Packaging and Package Marking
11.1 When the mineral admixture is delivered in packages,
8. Methods of Sampling and Testing
the class, name, and brand of the producer, and the weight of
8.1 Sam
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