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An interlaboratory study has been conducted using four ASTM rock-property test methods (longitudinal and transverse pulse velocity, indirect tensile strength, unconfined compressive strength, and uniaxial elastic modulus) on four types of intact rock (Barre Granite, Berea Sandstone, Salem Limestone, and Tennessee Marble). There were five replications per test per rock type. The rock testing was preceded by pilot testing on aluminum alloy 6061 T6 test specimens of four sizes, using the two nondestructive ASTM test methods (pulse velocity and elastic modulus) with three replications. The number of laboratories producing data for this report ranged from six to eight.
The test results for aluminum are generally more precise than those for rock. The rock-property tests with the largest and smallest precision are longitudinal pulse velocity and indirect tensile strength, respectively. The rock types yielding the greatest and least precise test results are Barre Granite and Berea Sandstone, respectively.
Proposed precision statements are presented for the four ASTM rock-property test methods used in this study.
ConsultantChairman, Steering Committee, Interlaboratory Testing Program for Rock Properties, San Diego, CA
Stock #: GTJ10279J