ASTM D7227/D7227M-17 PDF Download

ASTM D7227/D7227M-17 is a standard practice that outlines the process of drying compacted asphalt mixture specimens using a vacuum drying apparatus. It is important to accurately determine the dry weight of specimens in order to obtain accurate density measurements and other tests in the construction and raw materials industries. This practice involves placing the specimens in a vacuum chamber, where a vacuum pump reduces the pressure and allows water to evaporate at low temperature. The temperature inside the chamber is carefully controlled to ensure that the specimen remains close to room temperature. Cycling between vacuum and airflow conditions helps to dry the specimen in a short period of time, with completely saturated specimens taking about 30 minutes to dry. This method can be used for various sizes of cylindrical and cubical asphalt mixture specimens. In addition to asphalt mixtures, this practice can also be used for drying other construction materials such as concrete, soils, aggregates, and loose asphalt mixtures. The standard also provides notes and footnotes for additional explanatory material.