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ASTM C618 - 25a

Standard Specification for Coal Ash and Raw or Calcined Natural Pozzolan for Use in Concrete

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Edition date: 2025-02-01
In Force
Available languages: English
Summary:

This specification covers coal fly ash and raw or calcined natural pozzolan for use in concrete where cementitious or pozzolanic action, or both, is desired, or where other properties normally attributed to fly ash or pozzolans may be desired, or where both objectives are to be achieved. Fly ash and natural pozzolans shall conform to the prescribed chemical composition requirements and physical requirements. The materials shall be tested for fineness, strength activity index, water requirement, soundness, and autoclave expansion or contraction.
Keywords: bottom ash; coal ash; fly ash; harvested coal ash; natural pozzolan;
Scope:

1.1 This specification covers coal ash and raw or calcined natural pozzolan, for use in concrete where cementitious or pozzolanic action, or both, is desired, or where other properties normally attributed to coal ash or natural pozzolans 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 coal ash or natural pozzolan 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 This specification does not cover the residue resulting from: (1) fluidized bed combustion, (2) the burning of municipal solid waste or any other refuse with coal, or (3) the burning of industrial or municipal solid waste in incinerators.

1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.4 The text of this standard refers to notes and footnotes, that provide explanatory information. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard.

1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
ICS: 91.100.30-Concrete and concrete products
CTN: C09.24 - C09.24

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Es referenciada por C1613 - 24a

Es referenciada por C1884 - 24

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Es referenciada por C129 - 23

Es referenciada por C1903 - 24

Es referenciada por C655M - 19a

Es referenciada por C1634 - 23a

Es referenciada por C441/C441M - 17

Es referenciada por C985M - 22

Es referenciada por C1670/C1670M - 24a

Es referenciada por C1417 - 19

Es referenciada por E1266 - 20

Es referenciada por C1731 - 21

Es referenciada por C507M - 22

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