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About This Item
Full Description
1.2 This 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.
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.
1.3 This specification provides for three levels of testing.
1.3.1 Level 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 6 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to meet the standard requirement of 100 % of reference strength, the compliance of the admixture to this standard is withdrawn and all users of the admixture shall be notified immediately.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).
1.6 The 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.
Document History
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ASTM C494/C494M-24
Standard Specification for Chemical Admixtures for Concrete- Most Recent
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ASTM C494/C494M-19e1
Standard Specification for Chemical Admixtures for Concrete- Historical Version
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ASTM C494/C494M-19
Standard Specification for Chemical Admixtures for Concrete- Historical Version
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ASTM C494/C494M-17
Standard Specification for Chemical Admixtures for Concrete- Historical Version
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ASTM C494/C494M-16
Standard Specification for Chemical Admixtures for Concrete- Historical Version
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ASTM C494/C494M-15a
Standard Specification for Chemical Admixtures for Concrete- Historical Version
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ASTM C494/C494M-15
Standard Specification for Chemical Admixtures for Concrete- Historical Version
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ASTM C494/C494M-13
viewing
Standard Specification for Chemical Admixtures for Concrete- Historical Version
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ASTM C494/C494M-12
Standard Specification for Chemical Admixtures for Concrete- Historical Version
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ASTM C494/C494M-11
Standard Specification for Chemical Admixtures for Concrete- Historical Version
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ASTM C494/C494M-10a
Standard Specification for Chemical Admixtures for Concrete- Historical Version
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ASTM C494/C494M-10
Standard Specification for Chemical Admixtures for Concrete- Historical Version
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ASTM C494/C494M-08a
Standard Specification for Chemical Admixtures for Concrete- Historical Version
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ASTM C494/C494M-08
Standard Specification for Chemical Admixtures for Concrete- Historical Version
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ASTM C494/C494M-05a
Standard Specification for Chemical Admixtures for Concrete- Historical Version
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ASTM C494/C494M-05
Standard Specification for Chemical Admixtures for Concrete- Historical Version
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ASTM C494/C494M-04
Standard Specification for Chemical Admixtures for Concrete- Historical Version
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ASTM C494/C494M-99ae1
Standard Specification for Chemical Admixtures for Concrete- Historical Version
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ASTM C494/C494M-99a
Standard Specification for Chemical Admixtures for Concrete- Historical Version