ASTM C494/C494M-19e1
- standard by ASTM International, 12/15/2019
- Standard Specification for Chemical Admixtures for Concrete
- Category: ASTM
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Full Description
1.1 This specification covers materials for use as chemical admixtures to be added to hydraulic-cement concrete mixtures for the purpose or purposes indicated for the eight types as follows:
1.1.1 Type A-Water-reducing admixtures,
1.1.2 Type B-Retarding admixtures,
1.1.3 Type C-Accelerating admixtures,
1.1.4 Type D-Water-reducing and retarding admixtures,
1.1.5 Type E-Water-reducing and accelerating admixtures,
1.1.6 Type F-Water-reducing, high range admixtures,
1.1.7 Type G-Water-reducing, high range, and retarding admixtures, and
1.1.8 Type S-Specific performance admixtures.
1.2 Unless specified otherwise by the purchaser, test specimens for qualifying an admixture shall be made using concreting materials as described in 11.1 - 11.3.
Note 1: As discussed in Appendix X2, it is recommended that, whenever practicable, supplementary tests be made by the purchaser using the cement, pozzolan, aggregates, air-entraining admixture, and the mixture proportions, batching sequence, and other physical conditions proposed for the specific work because the specific effects produced by chemical admixtures may vary with the properties and proportions of the other ingredients of the concrete. For example, Types F and G admixtures may exhibit much higher water reduction in concrete mixtures having higher cement contents than that listed in 12.1.1.
Note 2: The purchaser should verify 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 sufficient amounts of chloride may accelerate corrosion of steel reinforcement. Compliance with the requirements of this specification does not constitute assurance of acceptability of the admixture for use in reinforced concrete.
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. Proof of compliance shall be based on comparisons of the average test results from the batches of test concrete and the average test results from the batches of reference concrete. Admixtures (except for Types B, C, E, and S) shall qualify for provisional compliance if the time of setting, length change, and durability factor meet the physical requirements and any of the alternative compressive strength requirements shown in parentheses in Table 1 are met through the date of provisional acceptance (see Note 4). If subsequent test results at six months or one year fail to meet the requirement of at least 100 % of reference strength, the provisional 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 ca
Product Details
- Published:
- 12/15/2019
- Number of Pages:
- 15
- File Size:
- 1 file , 350 KB
- Note:
- This product is unavailable in Russia, Ukraine, Belarus
Document History
ASTM C494/C494M-19e1
ASTM C494/C494M-17
ASTM C494/C494M-16
ASTM C494/C494M-15
ASTM C494/C494M-12
ASTM C494/C494M-11
ASTM C494/C494M-10a
ASTM C494/C494M-10
ASTM C494/C494M-08
ASTM C494/C494M-05a
ASTM C494/C494M-04
ASTM C494/C494M-99ae1
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