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ASTM C618-2019 pdf free download

ASTM C618-2019 pdf free download.Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete
1. Scope
1.1 This specification covers coal fly ash and raw or calcined natural pozzolan for use in concrete where cementi- tious 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. N OTE 1—Finely divided materials may tend to reduce the entrained air content ofconcrete. Hence, ifa 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. 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 foot- notes (excluding those in tables and figures) shall not be considered as requirements of the standard. 1.4 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Terminology
3.1 Definitions: 3.1.1 For definitions of terms used in this specification refer to Terminology C125.
4. Classification
4.1 Class N—Raw or calcined natural pozzolans that com- ply with the applicable requirements for the class as given herein, such as some diatomaceous earths; opaline cherts and shales; tuffs and volcanic ashes or pumicites, calcined or uncalcined; and various materials requiring calcination to induce satisfactory properties, such as some clays and shales. 4.2 Class F—Fly ash that meets the applicable requirements for this class as given herein. This class of fly ash has pozzolanic properties. 4.3 Class C—Fly ash that meets the applicable requirements for this class as given herein. This class of fly ash, in addition to having pozzolanic properties, also has some cementitious properties. N OTE 2—Class F fly ash is typically produced from burning anthracite or bituminous coal, but may also be produced from subbituminous coal and from lignite. Class C fly ash is typically produced from burning lignite or subbituminous coal, and may also be produced from anthracite or bituminous coal.
5. Ordering Information
5.1 The purchaser shall specify any supplementary optional physical requirements. 5.2 The purchaser shall indicate which procedure, A or B, shall be used when specifying requirements for effectiveness in contribution to sulfate resistance under Table 3. 6. Chemical Composition 6.1 Fly ash and natural pozzolans shall conform to the requirements as to chemical composition prescribed in Table 1.N OTE 3—The chemical component determinations and the limits placed on each do not predict the performance of the fly ash or natural pozzolan with hydraulic cement in concrete, but collectively help describe compo- sition and uniformity of the material.
10. Rejection
10.1 The purchaser has the right to reject material that fails to conform to the requirements of this specification. Rejection shall be reported to the producer or supplier promptly and in writing. 10.2 The purchaser has the right to reject packages varying more than 5 % from the stated weight. The purchaser also has the right to reject the entire shipment if the average weight of the packages in any shipment, as shown by weighing 50 packages taken at random, is less than that specified. 10.3 The purchaser has the right to require that material in storage prior to shipment for a period longer than 6 months after testing be retested. The purchaser has the right to reject such material if it fails to meet the fineness requirements.

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