ASTM C688-14 PDF Download

The ASTM C688-14 standard is a specification that outlines methods to investigate the effectiveness of materials that are added to hydraulic cements during manufacturing. These materials, when interground with the clinker, aim to beneficially change the properties of the cement. The standard requires testing of cement, mortar, and concrete, with specific values set for properties such as autoclave expansion, drying shrinkage, setting time, compressive strength, water content, flexural strength, and resistance to freezing and thawing.

The standard also acknowledges that certain additions in cement may have unintended effects on properties other than those they are intended to modify. Therefore, it provides criteria for judging the changes in cement pastes, mortars, and concrete caused by these additions. Additionally, some additives may be effective for multiple purposes as specified in the standard.