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Description of ASTM-C618 2015ASTM C618-15Historical Standard: Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in ConcreteASTM C618Scope 1.1 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. Note 1: Finely divided materials may tend to reduce the entrained air content of concrete. Hence, if a fly 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.
(A) The use of Class F pozzolan containing up to 12.0 % loss on ignition may be approved by the user if either
acceptable performance records or laboratory test results are made available.
(A) The strength activity
index with portland cement is not to be considered a measure of the compressive strength of concrete containing the fly ash or natural pozzolan. The mass of fly ash or natural pozzolan
specified for the test to determine the strength activity index with portland cement is not considered to
be the proportion recommended for the concrete to be used in the work. The optimum amount of fly ash or natural pozzolan for any specific project is determined by the required properties of
the concrete and other constituents of the concrete and is to be established by testing. Strength activity
index with portland cement is a measure of reactivity with a given cement and is subject to variation depending on the source of both the fly ash or natural pozzolan and the cement.
(B) Meeting the 7 day or 28 day strength activity index will indicate specification compliance.
(C) If the fly ash or natural pozzolan will constitute more than 20 % by mass of the cementitious material in
the project mixture, the test specimens for autoclave expansion shall contain that anticipated percentage. Excessive autoclave expansion is highly significant in cases where water to
cementitious material ratios are low, for example, in block or shotcrete mixtures.
(A) Determination of compliance or noncompliance with the requirement relating to increase in drying shrinkage
will be made only at the request of the purchaser.
(B) Fly ash or natural pozzolans meeting this requirement are considered as effective in controlling alkali
silica reactions as the use of the low-alkali control cement used in the evaluation. However, the fly ash or natural pozzolan shall be considered effective only when used at percentages by
mass of the total cementitious material equal to or exceeding that used in the tests and when the alkali content of the cement to be used does not exceed that used in the tests by more than
0.05 %. See Appendix XI, Test Methods C311.
(C) Fly ash or natural pozzolan shall be considered effective only when the fly ash or natural pozzolan is used
at percentages, by mass, of the total cementitious material within 2 % of those that are successful in the test mixtures or between two percentages that are successful, and when the
C3A content of the project cement is less than, or equal to, that which was used in the test mixtures. See Appendix X2 of Test Method
C311.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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. Keywords fly ash; natural pozzolan; pozzolans; ICS Code ICS Number Code 91.100.30 (Concrete and concrete products) DOI: 10.1520/C0618-15 The following editions for this book are also available...
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About ASTMASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide. |
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