ASTM C618-12a

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

ABSTRACT
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.
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. 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.TABLE 1 Chemical Requirements    
Class  
N  
F  
C  
Silicon dioxide (SiO2) plus aluminum oxide (Al2O3) plus iron oxide (Fe2O3),
min, %  
70.0  
70.0  
50.0  
Sulfur trioxide (SO3), max, %  
4.0  
5.0  
5.0  
Moisture content, max, %  
3.0  
3.0  
3.0  
Loss on ignition, max, %  
10.0  
6.0A  
6.0 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.TABLE 2 Physical Requirements    
Class  
N  
F  
C  
Fineness:  
Amount retained when wet-sieved on 45 μm (No. 325) sieve, max, %  
34  
34  
34  
Strength activity index: A  
With portland cement, at 7 days, min, percent of
control  
75B  
75B  
75B  
With portland cement, at 28 days, min, percent of
control  
75B  
75B  
75B  
Water requirement, max, percent of control  
115  
105  
105  
Soundness: C  
Autoclave expansion or contraction, max, %  
0.8  
0.8  
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, %  
5  
5  
5  
Percent retained on 45-μm (No. 325), max variation,
percentage points from average  
5  
5  
5 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...

General Information

• Status: Historical
• Publication Date: 14-Dec-2012
• ICS: 91.100.30 - Concrete and concrete products
• Technical Committee: C09 - Concrete and Concrete Aggregates
• Drafting Committee: C09.24 - Supplementary Cementitious Materials

Relations

• Replaces: ASTM C618-12 - Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete
• Effective Date: 15-Dec-2012
• Referred By: ASTM F1090-15 - Standard Classification for Bank and Mercantile Vault Construction
• Effective Date: 15-Dec-2012
• Referred By: ASTM C1778-22 - Standard Guide for Reducing the Risk of Deleterious Alkali-Aggregate Reaction in Concrete
• Effective Date: 15-Dec-2012
• Referred By: ASTM C139-22 - Standard Specification for Concrete Masonry Units for Construction of Catch Basins and Manholes
• Effective Date: 15-Dec-2012
• Referred By: ASTM C1417-19 - Standard Specification for Manufacture of Reinforced Concrete Sewer, Storm Drain, and Culvert Pipe for Direct Design
• Effective Date: 15-Dec-2012
• Referred By: ASTM C441/C441M-17 - Standard Test Method for Effectiveness of Pozzolans or Ground Blast-Furnace Slag in Preventing Excessive Expansion of Concrete Due to the Alkali-Silica Reaction
• Effective Date: 15-Dec-2012
• Referred By: ASTM C1089-19 - Standard Specification for Spun Cast Prestressed Concrete Poles
• Effective Date: 15-Dec-2012
• Referred By: ASTM C1846/C1846M-19 - Standard Specification for Performance Based Manufacture of Reinforced Concrete Culvert, Storm Drain, and Sewer Pipe
• Effective Date: 15-Dec-2012
• Referred By: ASTM C506M-22a - Standard Specification for Reinforced Concrete Arch Culvert, Storm Drain, and Sewer Pipe (Metric)
• Effective Date: 15-Dec-2012
• Referred By: ASTM C1227-23 - Standard Specification for Precast Concrete Septic Tanks
• Effective Date: 15-Dec-2012
• Referred By: ASTM C1877-19 - Standard Specification for Adhered Concrete Masonry Units
• Effective Date: 15-Dec-2012
• Referred By: ASTM C505-19 - Standard Specification for Nonreinforced Concrete Irrigation Pipe with Rubber Gasket Joints
• Effective Date: 15-Dec-2012
• Referred By: ASTM C76M-22a - Standard Specification for Reinforced Concrete Culvert, Storm Drain, and Sewer Pipe (Metric)
• Effective Date: 15-Dec-2012
• Referred By: ASTM C1697-21 - Standard Specification for Blended Supplementary Cementitious Materials
• Effective Date: 15-Dec-2012
• Referred By: ASTM C387/C387M-23 - Standard Specification for Packaged, Dry, Combined Materials for Concrete and High Strength Mortar
• Effective Date: 15-Dec-2012

Standards Content (Sample)

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Designation:C618 −12a
StandardSpecification for
Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use
1
in Concrete
This standard is issued under the fixed designation C618; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope* 3.1.2 fly ash—thefinelydividedresiduethatresultsfromthe
combustion of ground or powdered coal and that is transported
1.1 This specification covers coal fly ash and raw or
by flue gasses.
calcined natural pozzolan for use in concrete where cementi-
tious or pozzolanic action, or both, is desired, or where other
NOTE 2—This definition of fly ash does not include, among other
things, the residue resulting from: (1) the burning of municipal garbage or
properties normally attributed to fly ash or pozzolans may be
any other refuse with coal; (2) the injection of lime directly into the boiler
desired, or where both objectives are to be achieved.
for sulfur removal; or (3) the burning of industrial or municipal garbage
in incinerators commonly known as “incinerator ash.”
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
4. Classification
concrete for which entrainment of air is specified, provision should be
made to ensure that the specified air content is maintained by air content
4.1 Class N—Raw or calcined natural pozzolans that com-
tests and by use of additional air-entraining admixture or use of an
ply with the applicable requirements for the class as given
air-entraining admixture in combination with air-entraining hydraulic
herein, such as some diatomaceous earths; opaline cherts and
cement.
shales; tuffs and volcanic ashes or pumicites, calcined or
1.2 The values stated in SI units are to be regarded as
uncalcined; and various materials requiring calcination to
standard. No other units of measurement are included in this
induce satisfactory properties, such as some clays and shales.
standard.
4.2 Class F—Fly ash that meets the applicable requirements
1.3 The text of this standard references notes and footnotes,
for this class as given herein. This class of fly ash has
which provide explanatory information. These notes and foot-
pozzolanic properties.
notes (excluding those in tables and figures) shall not be
considered as requirements of the standard. 4.3 Class C—Fly ash that meets the applicable requirements
for this class as given herein. This class of fly ash, in addition
2. Referenced Documents
to having pozzolanic properties, also has some cementitious
2
2.1 ASTM Standards:
properties.
C125 Terminology Relating to Concrete and Concrete Ag-
NOTE 3—Class F fly ash is typically produced from burning anthracite
gregates
or bituminous coal, but may also be produced from subbituminous coal
C311 Test Methods for Sampling and Testing Fly Ash or
andfromlignite.ClassCflyashistypicallyproducedfromburninglignite
or subbituminous coal, and may also be produced from anthracite or
Natural Pozzolans for Use in Portland-Cement Concrete
bituminous coal. Class C fly ashes typically have total calcium contents,
expressed as calcium oxide (CaO), that are higher than Class F fly ashes.
3. Terminology
3.1 Definitions:
5. Ordering Information
3.1.1 The terms used in this specification are defined in
5.1 The purchaser shall specify any supplementary optional
Terminology C125.
physical requirements.
5.2 The purchaser shall indicate which procedure, A or B,
1
This specification is under the jurisdiction of ASTM Committee C09 on
shallbeusedwhenspecifyingrequirementsforeffectivenessin
Concrete and Concrete Aggregatesand is the direct responsibility of Subcommittee
C09.24 on Supplementary Cementitious Materials.
contribution to sulfate resistance under Table 3.
Current edition approved Dec. 15, 2012. Published January 2013. Originally
approved in 1968. Last previous edition approved in 2012 as C618–12. DOI:
6. Chemical Composition
10.1520/C0618–12a.
2
6.1 Fly ash and natural pozzolans shall conform to the
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
requirements as to chemical composition prescribed inTable 1.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. NOTE4—Thechemicalcomponentdeterminationsandthelimitsplaced
*A Summary of Changes section appears at the end of this standard
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