ASTM C494/C494M-17
Standard Specification for Chemical Admixtures for Concrete

Standard No.
ASTM C494/C494M-17
Release Date
2017
Published By
American Society for Testing and Materials (ASTM)
Status
Replace By
ASTM C494/C494M-19
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 in the field 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 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.

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.

ASTM C494/C494M-17 Referenced Document

  • ASTM C1017/C1017M Standard Specification for Chemical Admixtures for Use in Producing Flowing Concrete
  • 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
  • ASTM C143/C143M Standard Test Method for Slump of Hydraulic-Cement Concrete
  • ASTM C150/C150M Standard Specification for Portland Cement
  • ASTM C157/C157M Standard Test Method for Length Change of Hardened Hydraulic-Cement, Mortar, and Concrete
  • ASTM C183/C183M Standard Practice for Sampling and the Amount of Testing of Hydraulic Cement
  • 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
  • ASTM C260/C260M Standard Specification for Air-Entraining Admixtures for Concrete
  • ASTM C33/C33M Standard Specification for Concrete Aggregates
  • 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
  • ASTM C78/C78M Standard Test Method for Flexural Strength of Concrete (Using Simple Beam with Third-Point Loading)
  • 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

ASTM C494/C494M-17 history

Standard Specification for Chemical Admixtures for Concrete


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