AASHTO T 356-15 (2019) PDF Download

The AASHTO T 356-15 (2019) standard outlines a laboratory procedure for determining the air content of hardened concrete using a high-pressure air meter. The aim of this test method is to observe the change in linear piston movement when a specimen is placed in the test chamber, compared to the movement without a specimen. This change in movement is caused by the displacement of a specific volume of compressible air by a specific volume of incompressible water.

By measuring the change in linear piston movement, the air content of the hardened concrete can be determined. This is an important parameter to assess the quality and performance of the concrete mixture. The test is conducted in a laboratory setting, allowing for precise measurements and control of the testing conditions.

The AASHTO T 356-15 provides detailed instructions on the equipment setup, specimen preparation, and testing procedure. It specifies the requirements for the high-pressure air meter and the necessary calibration procedures. Additionally, the standard addresses potential sources of error and provides guidance on troubleshooting and interpreting the test results.