ASTM D5731-16 PDF Download

The ASTM D5731-16 standard provides guidelines, requirements, and procedures for determining the point load strength index of rock. This test is an index test and is mainly used for classifying rock strength.

The test can be performed on rock specimens in the form of cores, blocks, or irregular lumps, with a test diameter ranging from 30 to 85 mm. The test can be conducted either in the field or laboratory, although it is typically performed in the field due to the portability of the testing machine and the minimal specimen preparation required. This allows for quick testing of specimens shortly after they are collected.

The standard primarily applies to medium strength rock with a compressive strength over 15 MPa. It should be noted that the standard does not cover the selection of specimen type or the consideration of anisotropic factors. The specific details of the point load test program need to be determined prior to testing, based on factors such as intended data use, budgetary constraints, and other considerations.

The standard also emphasizes the importance of competency in personnel, suitability of equipment, and compliance with relevant practices to ensure reliable results. Furthermore, it specifies guidelines for significant digits and rounding in data collection and calculation.