ASTM C490 covers the requirements for the apparatus and equipment used to prepare specimens for the determination of length change in hardened cement paste, mortar, and concrete. It also covers the equipment used for the determination of these length changes, and the procedures for its use.

This practice is intended to provide standard requirements for apparatus common to many test methods used in connection with cement and concrete and standardized procedures for its use.

For more information about this test method, visit the official ASTM website.