ASTM C494

Full Name

ASTM C494 – Standard Specification for Chemical Admixtures for Concrete

Scope

ASTM C494 outlines the requirements and test methods for chemical admixtures used in hydraulic-cement concrete mixtures. It classifies admixtures into eight types based on their primary function:

  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
  8. Type S – Specific performance admixtures (e.g., corrosion inhibitors, shrinkage-reducing admixtures).

The standard provides detailed specifications for each admixture type, including:

  • Composition and properties: requirements for the chemical composition and physical properties of the admixture.
  • Performance criteria: minimum performance requirements for the admixture in terms of its effect on concrete properties, such as slump, air content, setting time, strength, and durability.
  • Test methods: standardized test methods for evaluating the admixture’s compliance with the specification.
  • Sampling and acceptance: procedures for sampling and acceptance testing of the admixture.

ASTM C494 is essential for ensuring the quality and performance of chemical admixtures used in concrete construction. It helps ensure that admixtures meet the specified requirements and perform as intended, contributing to the production of durable and high-quality concrete.

ASTM C494 Accredited Laboratory

Applied Testing & Geosciences, LLC is accredited for performing tests using the ASTM C494 standard: testing plans for concrete admixtures.

Contact us for more information.

Resources

Keywords

chemical admixtures; concrete; water-reducing admixture; retarding admixture; accelerating admixture; high-range water-reducing admixture; specific performance admixture; slump; air content; setting time; strength; durability

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