ASTM C618-12a 15.12.2012 | technical standard

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1. Scope

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.

Class

Silicon dioxide (SiO₂) plus aluminum oxide (Al₂O₃) plus iron oxide (Fe₂O₃),
min, %

70.0

50.0

Sulfur trioxide (SO₃), max, %

4.0

5.0

Moisture content, max, %

3.0

Loss on ignition, max, %

10.0

6.0^A

6.0

Class

Fineness:

Amount retained when wet-sieved on 45 μm (No. 325) sieve, max, %

Strength activity index: ^A

With portland cement, at 7 days, min, percent of
control

75^B

With portland cement, at 28 days, min, percent of
control

75^B

Water requirement, max, percent of control

115

105

Soundness: ^C

Autoclave expansion or contraction, max, %

0.8

Uniformity requirements:

The density and fineness of individual samples
shall not vary from the average established by the
ten preceding tests, or by all preceding tests if the
number is less than ten, by more than:

Density, max variation from average, %

Percent retained on 45-μm (No. 325), max variation,
percentage points from average

Class

Increase of drying shrinkage of mortar bars at 28 days, max, difference, in %,
over control^A

0.03

Uniformity Requirements:

In addition, when air-entraining concrete is specified, the quantity of air-
entraining agent required to produce an air content of 18.0 vol % of mortar
shall not vary from the average established by the ten preceding tests or by all
preceding tests if less than ten, by more than, %

Effectiveness in Controlling Alkali-Silica Reaction:^B

Expansion of test mixture as percentage of low-alkali cement control, at 14
days, max, %

100

Effectiveness in Contributing to Sulfate Resistance:^C

Procedure A:

Expansion of test mixture:

For moderate sulfate exposure after 6 months exposure, max, %

0.10

For high sulfate exposure after 6 months exposure, max, %

0.05

Procedure B:

Expansion of test mixture as a percentage of sulfate resistance cement
control after at least 6 months exposure, max,%

100

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.

2. Referenced Documents

C311-11	Standard Test Methods for Sampling and Testing Fly Ash or Natural Pozzolans for Use in Portland-Cement Concrete
C125-21a	Standard Terminology Relating to Concrete and Concrete Aggregates (Includes all amendments and changes 10/14/2021).

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ASTM C618-12a

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