1.1 The objective of this test method is to determine the time over which rock bolt tension decreases from the installed value to a designated minimum value.1.2 This test method is applicable to any anchor system which is not fully encapsulated immediately upon installation, including mechanical, cement grout, resin (epoxy, polyester, and the like) or other similar systems.1.3 The values stated in inch-pound units are to be regarded as the standard.1.4 All observed and ca