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ASTM C311-11

ASTM C311-11

Standard Test Methods for Sampling and Testing Fly Ash or Natural Pozzolans for Use in Portland-Cement Concrete

2021-03-02 /Historical
Superseeded by:
Significance and Use:

These test methods are used to develop data for comparison with the requirements of Specification C618. These test methods are based on standardized testing in the laboratory and are not intended to simulate job conditions.

Strength Activity IndexThe test for strength activity index is used to determine whether fly ash or natural pozzolan results in an acceptable level of strength development when used with hydraulic cement in concrete. Since the test is performed with mortar, the results may not provide a direct correlation of how the fly ash or natural pozzolan will contribute to strength in concrete.

Chemical Tests The chemical component determinations and the limits placed on each do not predict the performance of a fly ash or natural pozzolan with hydraulic cement in concrete, but collectively help describe composition and uniformity of the material.


1.1 These test methods cover procedures for sampling and testing fly ash and raw or calcined pozzolans for use in portland-cement concrete.

1.2 The procedures appear in the following order:

Reagents and apparatus10
Moisture content11 and 12
Loss on ignition13 and 14
Silicon dioxide, aluminum oxide, iron oxide, calcium oxide, magnesium oxide, sulfur trioxide, sodium oxide
and potassium oxide
Available alkali16 and 17
Increase of drying shrinkage of mortar bars21-23
Air-entrainment of mortar25 and 26
Strength activity index with portland cement27-30
Water requirement31
Effectiveness of Fly Ash or Natural Pozzolan in
Controlling Alkali-Silica Reactions
Effectiveness of Fly Ash or Natural Pozzolan in
Contributing to Sulfate Resistance

1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are provided for information purposes only.

1.4 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 appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

1.5 The text of this standard references notes and footnotes that provide explanatory information. These notes and footnotes (excluding those in tables) shall not be considered as requirements of this standard.

fly ash; natural pozzolan; Portland cement concrete (PCC); Pozzolans; Strength--cement/concrete mixtures/applications; Alkalies content--cement; Calcined pozzolans; Concrete admixtures; Fineness; Fly ash and other pozzolans
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