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  • ASTM C618-12a

ASTM C618-12a

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

ASTM International, 12/15/2012

Publisher: ASTM

File Format: PDF

$30.00$60.00


Published:15/12/2012

Pages:5

File Size:1 file , 180 KB

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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

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