ASTM C490/C490M-17 PDF Download

ASTM C490/C490M-17 is a standard practice that provides requirements for the apparatus and equipment used in the determination of length change in hardened cement paste, mortar, and concrete. The standard establishes standardized procedures for the use of this apparatus, while the specific requirements for materials, mixtures, conditioning of specimens, number of specimens, ages at which measurements are to be made, interpretation of results, and precision and bias are specified in the relevant test methods.

The practice covers the entire process, from the preparation of specimens to the determination of length changes. It addresses the apparatus and equipment required for both specimen preparation and the actual length change measurement. It also emphasizes that the methods for specimen preparation and curing, as well as the detailed procedures for calculation and reporting of test results, are to be found in the applicable test methods.