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The ASTM C490/490M standard, titled "Standard Test Method for Length Change of Hardened Cement Mortar and Concrete with Expansive Additives," provides guidelines and procedures for determining the length change of hardened cement mortar and concrete containing expansive additives. This test method helps evaluate the potential expansion or contraction of cementitious materials when subjected to certain conditions.
ASTM C490/490M outlines the testing method using prismatic specimens of mortar or concrete, which are subjected to specific drying or wetting conditions. The specimens are measured before and after exposure to determine the length change.
Products associated with ASTM C490/490M include cement mortar or concrete samples containing expansive additives, which are used to prepare the prismatic specimens. Testing equipment such as molds for specimen preparation and measuring devices, such as calipers or extensometers, may be utilized.
By following the ASTM C490/490M standard and utilizing associated products, engineers, researchers, and testing laboratories can assess the length change characteristics of cementitious materials with expansive additives. This information aids in understanding the dimensional stability and performance of these materials, ensuring their suitability for applications where dimensional changes may occur.