ASTM C494/C494M-19e1
Standard Specification for Chemical Admixtures for Concrete

Standard No.
ASTM C494/C494M-19e1
Release Date
2019
Published By
American Society for Testing and Materials (ASTM)
Latest
ASTM C494/C494M-19e1
Scope
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 carried out to provide results against which later comparisons shall be made. 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 shown in parentheses correspond to a 99 % probability of passing strength requirements at subsequent test ages,2 if any one of the requirements is met. There is no requirement that all be met. 1.3.2 Level 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. 1.3.3 Level 3—For acceptance of a lot or for measuring uniformity within or between lots, if specified by the purchaser, the uniformity and equivalence tests of Section 6 shall be used. 1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be 1 This specification is under the jurisdiction of ASTM Committee C09 on Concrete and Concrete Aggregates and is the direct responsibility of Subcommittee C09.23 on Chemical Admixtures. Current edition approved Dec. 15, 2019. Published March 2020. Originally approved in 1962. Last previous edition approved in 2017 as C494/C494M – 17. DOI: 10.1520/C0494_C0494M-19E01. 2 Supporting data have been filed at ASTM International Headquarters and may be obtained by requesting Research Report RR:C09-1030. Contact ASTM Customer Service at [email protected]. *A Summary of Changes section appears at the end of this standard Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States This 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. 1 used independently of the other, and values from the two systems shall not be combined. Some values have only SI units because the inch-pound equivalents are not used in practice. 1.5 The text of this standard refers to notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard. 1.6 The following precautionary caveat pertains only to test method 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. (Warning—Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to exposed skin and tissue upon prolonged exposure.3 ) 1.7 This 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.

ASTM C494/C494M-19e1 Referenced Document

  • ASTM C125 Standard Terminology Relating to Concrete and Concrete Aggregates*， 2021-10-01 Update
  • ASTM C127 Standard Test Method for Density, Relative Density (Specific Gravity), and Absorption of Coarse Aggregate
  • ASTM C128 Standard Test Method for Density, Relative Density (Specific Gravity), and Absorption of Fine Aggregate
  • ASTM C136/C136M Standard Test Method for Sieve Analysis of Fine and Coarse Aggregates
  • ASTM C138/C138M Standard Test Method for Density (Unit Weight), Yield, and Air Content (Gravimetric) of Concrete*， 2023-08-01 Update
  • ASTM C143/C143M Standard Test Method for Slump of Hydraulic-Cement Concrete*， 2020-06-01 Update
  • ASTM C150/C150M Standard Specification for Portland Cement*， 2022-07-01 Update
  • ASTM C157/C157M Standard Test Method for Length Change of Hardened Hydraulic-Cement, Mortar, and Concrete
  • ASTM C1753/C1753M Standard Practice for Evaluating Early Hydration of Hydraulic Cementitious Mixtures Using Thermal Measurements*， 2021-12-01 Update
  • ASTM C183/C183M Standard Practice for Sampling and the Amount of Testing of Hydraulic Cement*， 2023-06-01 Update
  • ASTM C192/C192M Standard Practice for Making and Curing Concrete Test Specimens in the Laboratory
  • ASTM C231/C231M Standard Test Method for Air Content of Freshly Mixed Concrete by the Pressure Method*， 2024-01-01 Update
  • ASTM C260/C260M Standard Specification for Air-Entraining Admixtures for Concrete*， 2024-04-22 Update
  • ASTM C33/C33M Standard Specification for Concrete Aggregates*， 2023-08-01 Update
  • ASTM C39/C39M Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens
  • ASTM C403/C403M Standard Test Method for Time of Setting of Concrete Mixtures by Penetration Resistance
  • ASTM C666/C666M Standard Test Method for Resistance of Concrete to Rapid Freezing and Thawing*， 2024-04-22 Update
  • ASTM C78/C78M Standard Test Method for Flexural Strength of Concrete (Using Simple Beam with Third-Point Loading)*， 2022-03-01 Update
  • ASTM D1193 Standard Specification for Reagent Water
  • ASTM D75/D75M Standard Practice for Sampling Aggregates
  • ASTM D891 Standard Test Methods for Specific Gravity, Apparent, of Liquid Industrial Chemicals
  • ASTM E100 Standard Specification for ASTM Hydrometers
  • ASTM E1252 Standard Practice for General Techniques for Obtaining Infrared Spectra for Qualitative Analysis*， 2021-04-01 Update
  • ASTM E178 Standard Practice for Dealing With Outlying Observations

ASTM C494/C494M-19e1 history

Standard Specification for Chemical Admixtures for Concrete


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