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ASTM C 494/C494M : 2017 : REDLINE

Superseded

Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

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Standard Specification for Chemical Admixtures for Concrete

Available format(s)

PDF

Superseded date

28-08-2020

Language(s)

English

Published date

15-06-2017

€67.30
Excluding VAT

CONTAINED IN VOL. 04.02, 2017 Defines materials for use as chemical admixtures to be added to hydraulic-cement concrete mixtures in the field for the purpose or purposes indicated for the eight types as follows: 1) Type A - Water-reducing admixtures, 2) Type B - Retarding admixtures, 3) Type C - Accelerating admixtures, 4) Type D - Water-reducing and retarding admixtures, 5) Type E - Water-reducing and accelerating admixtures, 6) Type F - Water-reducing, high range admixtures, 7) Type G - Water-reducing, high range, and retarding admixtures, and 8) Type S - Specific performance admixtures.

Committee
C 09
DevelopmentNote
Supersedes ASTM C 494. (08/2001)
DocumentType
Redline
Pages
12
PublisherName
American Society for Testing and Materials
Status
Superseded
SupersededBy

1.1This specification covers materials for use as chemical admixtures to be added to hydraulic-cement concrete mixtures in the field for the purpose or purposes indicated for the eight types as follows:

1.1.1Type A—Water-reducing admixtures,

1.1.2Type B—Retarding admixtures,

1.1.3Type C—Accelerating admixtures,

1.1.4Type D—Water-reducing and retarding admixtures,

1.1.5Type E—Water-reducing and accelerating admixtures,

1.1.6Type F—Water-reducing, high range admixtures,

1.1.7Type G—Water-reducing, high range, and retarding admixtures, and

1.1.8Type S—Specific performance admixtures.

1.2This specification stipulates tests of an admixture with suitable concreting materials as described in 11.1 – 11.3 or with cement, pozzolan, aggregates, and an air-entraining admixture proposed for specific work (11.4). Unless specified otherwise by the purchaser, the tests shall be made using concreting materials as described in 11.1 – 11.3.

Note 1:It is recommended that, whenever practicable, tests be made using the cement, pozzolan, aggregates, air-entraining admixture, and the mixture proportions, batching sequence, and other physical conditions proposed for the specific work (11.4) because the specific effects produced by chemical admixtures may vary with the properties and proportions of the other ingredients of the concrete. For instance, Types F and G admixtures may exhibit much higher water reduction in concrete mixtures having higher cement factors than that listed in 12.1.1.

Mixtures having a high range water reduction generally display a higher rate of slump loss. When high-range admixtures are used to impart increased workability (6 to 8-in. slump [150 to 200–mm]), the effect may be of limited duration, reverting to the original slump in 30 to 60 min depending on factors normally affecting rate of slump loss. The use of chemical admixtures to produce high-slump (flowing) concrete is covered by Specification C1017/C1017M.

Note 2:The purchaser should ensure that the admixture supplied for use in the work is equivalent in composition to the admixture subjected to test under this specification (see Section 6, Uniformity and Equivalence).

Note 3:Admixtures that contain relatively large amounts of chloride may accelerate corrosion of prestressing steel. Compliance with the requirements of this specification does not constitute assurance of acceptability of the admixture for use in prestressed concrete.

1.3This specification provides for three levels of testing.

1.3.1Level 1—During the initial approval stage, proof of compliance with the performance requirements defined in Table 1 demonstrates that the admixture meets the requirements of this specification. Admixtures (except for Types B, C, E, and S) shall qualify for provisional compliance when the physical requirements and any of the alternative compressive strength requirements in Table 1 are met. If subsequent test results at six months or one year fail to meet the standard requirement of 100 % of reference strength, the compliance of the admixture to this standard is withdrawn and all users of the admixture shall be notified immediately. Uniformity and equivalence tests of Section 6 shall be carried out to provide results against which later comparisons can be made (see Note 4).

TABLE 1 Physical RequirementsA

Type A,
Water
Reducing

Type B,
Retarding

Type C,
Acceler-
ating

Type D,
Water
Reducing
and
Retarding

Type E,
Water
Reducing
and
Accelerating

Type F,
Water
Reducing,
High Range

Type G,
Water
Reducing,
High
Range
and Retarding

Type S
Specific
Performance

Water content, max, % of  control

95

...

...

95

95

88

88

...

Time of setting, allowable deviation from control, h:min:

Initial: at least

...

1:00 later

1:00 earlier

1:00 later

1:00 earlier

...

1:00 later

 not more than

1:00 earlier
nor 1:30
later

3:30 later

3:30 earlier

3:30 later

3:30 earlier

1:00 earlier
nor 1:30
later

3:30 later

1:00 earlier
nor 1:30
later

Final: at least

...

...

1:00 earlier

...

1:00 earlier

...

...

 not more than

1:00 earlier
nor 1:30
later

3:30 later

...

3:30 later

...

1:00 earlier
nor 1:30
later

3:30 later

1:00 earlier
nor 1:30
later

Compressive strength, min, % of control:B

  1 day

...

...

...

...

...

140

125

...

  3 days

110

90

125

110

125

125

125

90

  7 days

110

90

100

110

110

115

115

90

 28 days

110
(120)C

90

100

110
(120)C

110

110
(120)C

110
(120)C

90

 90 days

(117)C

n/a

n/a

(117)C

n/a

(117)C

(117)C

n/a

  6 months

100
(113)C

90

90

100
(113)C

100

100
(113)C

100
(113)C

90

  1 year

100

90

90

100

100

100

100

90

Flexural strength, min,  % control:B

  3 days

100

90

110

100

110

110

110

90

  7 days

100

90

100

100

100

100

100

90

 28 days

100

90

90

100

100

100

100

90

Length change, max  shrinkage (alternative  requirements):D

Percent of control

135

135

135

135

135

135

135

135

 Increase over control

0.010

0.010

0.010

0.010

0.010

0.010

0.010

0.010

Relative durability
 factor, minE

80

80

80

80

80

80

80

80

(A)The values in the table include allowance for normal variation in test results. The object of the 90 % compressive strength requirement for a Type B amd Type S admixture is to require a level of performance comparable to that of the reference concrete.
(B)The compressive and flexural strength of the concrete containing the admixture under test at any test age shall be not less than 90 % of that attained at any previous test age. The objective of this limit is to require that the compressive or flexural strength of the concrete containing the admixture under test shall not decrease with age.
(C)Alternative requirement. If the physical requirements are met and any of the measured relative strengths are greater than the requirement in parentheses, the admixture shall be considered provisionally qualified until the one-year strength test results are obtained.
(D)Alternative requirements, see 17.1.4, % of control limit applies when length change of control is 0.030 % or greater; increase over control limit applies when length change of control is less than 0.030 %.
(E)This requirement is applicable only when the admixture is to be used in air-entrained concrete which may be exposed to freezing and thawing while wet.

Note 4:Allowing for provisional compliance while retaining longer term compressive strength requirements promotes more rapid qualification of new materials, but also provides assurance that new admixture technologies will not exhibit unexpected longer term performance. The alternative compressive strength requirements in Table 1 are based on statistical analysis of 103 Specification C494/C494M evaluation tests. The alternative requirements correspond to a 99 % probability of passing subsequent test age requirements.2

1.3.2Level 2—Limited retesting is described in 5.2 – 5.2.2. Proof of compliance with the requirements of Table 1 demonstrates continued conformity of the admixture with the requirements of the specification.

1.3.3Level 3—For acceptance of a lot or for measuring uniformity within or between lots, when specified by the purchaser, the uniformity and equivalence tests of Section 6 shall be used.

1.4The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.

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

1.6The following precautionary caveat pertains only to the test method sections, Sections 11 – 18 of this Specification: 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.

1.7This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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