ASTM D4543 PDF

More D Scope 1. As such, it is not always possible to obtain or prepare rock core specimens which satisfy the desirable criteria given in this practice. Most commonly, this situation presents itself with weaker, more porous, and poorly cemented rock types and rock types containing significant structural features. For these and other rock types which are difficult to prepare, all reasonable efforts shall be made to prepare a sample in accordance with this practice. However, when it has been determined by trial that this is not possible, prepare the rock specimen to the highest standard practicable and consider this to be the best effort and report it as such, with all appropriate size and dimensional measurements reported as in Section 6.

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A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval.

Scope 1. As such, it is not always possible to obtain or prepare rock core specimens which satisfy the desirable criteria given in this practice. For these and other rock types which are difficult to prepare, all reasonable efforts shall be made to prepare a sample in accordance with this practice.

However, when it has been determined by trial that this is not possible, prepare the rock specimen to the highest standard practicable and consider this to be the best effort and report it as such, with all appropriate size and dimensional measurements reported as in Section 6. It is the responsibility of the user of this standard to consult and establish appropriate safety and health practices and deter- mine the applicability of regulatory limitations prior to use.

Current edition approved Nov. Published January Dimensional and surface tolerance checks are required in the test methods listed in 2. To simplify test procedures in laboratories, the parts of those procedures that are common to the test methods are given in this standard. Specimens 4. NOTE 1—It is desirable that the diameter of rock test specimens be at least ten times the diameter of the largest mineral grain.

For weak rock types which behave more like soil for example, weakly cemented sandstone , the specimen diameter should be at least six times the maximum particle diameter.

Procedure 5. If the maximum gap exceeds 0. Bureau of Mines , D specimen does not meet the required tolerance for straightness of the elements. The length of the V-block shall be sufficient that the specimen will not project over its ends during movement. The sensitivity of the dial gage shall be at least 0. The measurement contact tip of the dial gage shall be round in shape. If the dial gage traverses a natural cavity in the rock, readings in this region should not be included in the determination of D 0.

The maximum value of these three differences shall be less than 0. Take care to make sure that one end of the mounting pad maintains intimate contact with the end surface of the V-block during movement.

A dial gage sensitive to 0. These readings may be recorded in tabular form, or to simplify the procedure, they may be plotted directly on a graph as shown for End 1, Diameter 1, in Fig. Do not plot dial gage readings taken when the gage tip drops into a natural cavity in the rock. Turn the specimen end for end and repeat the same measurement procedures and tolerance checks for the other end surface.

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More D This is especially true for strong rocks, greater than psi 50 MPa and for rock specimens that will be tested in stiff testing load frames without a spherical seat where non-uniform loading could occur. Dimensional and surface tolerance checks are required in the test methods listed in Section 2. To simplify test procedures in laboratories, the parts of those procedures that are common to the test methods in Section 2. Thus, it follows that the field moisture condition of the specimen should be preserved until the time of the test.

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ASTM D4543 - Preparing Rock Core Specimens

A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Scope 1. As such, it is not always possible to obtain or prepare rock core specimens which satisfy the desirable criteria given in this practice.

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