ASTM C204

Full Name

ASTM C204 – Standard Test Methods for Fineness of Hydraulic Cement by Air-Permeability Apparatus

Scope

ASTM C204 outlines the procedure to determine the fineness of hydraulic cement using the Blaine air-permeability apparatus. Fineness is expressed as the total surface area in square centimeters per gram (or square meters per kilogram) of cement and is an important factor influencing the hydration rate and strength development of the cement.

The scope of ASTM C204 includes:

  • Two test methods:
    1. Test method A: the reference test method using the manually operated standard Blaine apparatus.
    2. Test method B: permits the use of an automated apparatus that meets specific qualification requirements.
  • Principle: the method measures the time for a specific volume of air to pass through a prepared bed of cement under a specified pressure difference. The time is then related to the surface area of the cement.
  • Apparatus: specifies the use of the Blaine air-permeability apparatus, including the cell, plunger, manometer, and other accessories.
  • Procedure: outlines the step-by-step procedure, including sample preparation, bed preparation, permeability test, and calculations.
  • Precision and bias: provides information on the precision and bias of the test methods.

It’s important to note that ASTM C204 primarily focuses on hydraulic cement but can also be applied to other materials. However, the results obtained for other materials might not be absolute fineness values but rather relative values.

This standard is essential for quality control in cement production and concrete mix design as it provides a reliable method to assess the fineness of hydraulic cement, which directly impacts its performance.

ASTM C204 Accredited Laboratory

Applied Testing & Geosciences, LLC is accredited for performing tests using the ASTM C204 standard.

Contact us today to learn more about our testing capabilities and how we can support your business.

Resources

Keywords

fineness; air permeability; hydraulic cement; Blaine apparatus; specific surface area; manometer; cell; plunger; porosity

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