AASHTO T153
Full Name
AASHTO T153 – Standard Method of Test for Fineness of Hydraulic Cement by Air Permeability Apparatus
Scope
AASHTO T153 is a standard test method used to determine the fineness of hydraulic cement, such as Portland cement, using the Blaine air permeability apparatus. The fineness of cement refers to the particle size distribution, with finer particles contributing to faster hydration and higher early strength. This test measures the specific surface area of the cement, which is the total surface area of the particles per unit mass.
Key aspects of AASHTO T153:
- Principle: the test is based on the principle that the rate of airflow through a bed of cement particles is inversely proportional to the fineness of the cement. A finer cement will have a higher specific surface area and offer greater resistance to airflow, resulting in a longer time for a specific volume of air to pass through.
- Apparatus: the Blaine air permeability apparatus consists of a permeability cell, a manometer, a timing device, and a source of vacuum. The cement sample is placed in the permeability cell, and a known volume of air is drawn through the bed of cement under a controlled pressure. The time required for the air to pass through the bed is measured, and the specific surface area is calculated.
- Procedure: AASHTO T153 provides detailed instructions for preparing the cement sample, assembling the apparatus, conducting the test, and calculating the specific surface area. The standard also specifies the required precision and accuracy of the test.
Significance of AASHTO T153:
- Quality control: the fineness of cement is a critical parameter that influences its performance and properties. By measuring the specific surface area, cement manufacturers and testing laboratories can ensure that the cement meets the specified fineness requirements.
- Performance prediction: the specific surface area can be used to predict the rate of hydration, strength development, and other performance characteristics of the cement.
- Mix design optimization: the fineness of cement can be adjusted to optimize the mix design of concrete for specific applications, such as achieving early strength gain or improved workability.
AASHTO T153 Accredited Laboratory
Applied Testing & Geosciences, LLC is accredited for performing tests using the AASHTO T153 standard.
Our laboratory offers comprehensive cement testing services, including the determination of fineness using the Blaine air permeability apparatus according to AASHTO T153. Our experienced technicians utilize calibrated equipment and adhere to strict quality control procedures to ensure accurate and reliable results.
Contact us for more information.
Resources
Keywords
fineness; specific surface area; air permeability; hydraulic cement; Blaine air permeability apparatus; manometer; porosity; particle size; bed of cement