Download ASTM D D5731-95-MétodoEnsaioCargaPontual PDF

TitleASTM D D5731-95-MétodoEnsaioCargaPontual
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platens to make contact along a core diameter. Ensure that the
distance,L, between the contact points and the nearest free end
is at least 0.5 times the core diameter (see Fig. 3(a)).

8.1.3 Determine and record the distancesD andL (see Fig.
3).

8.1.4 Steadily increase the load such that failure occurs
within 10 to 60 s, and record failure load,P. The test should be
rejected if the fracture surface passes through only one platen
loading point (see Fig. 4(d)).

8.1.5 The procedures in 8.1.2-8.1.4 are repeated for each
specimen of the rock type.

8.2 Axial Test:
8.2.1 Core specimens with length/diameter ratio of1⁄3 to 1

are suitable for axial testing (see Fig. 3(b)). Suitable specimens
can be obtained by saw-cutting or chisel-splitting.

8.2.2 Insert a specimen in the test machine and close the
platens to make contact along a line perpendicular to the core

end faces (in the case of isotropic rock, the core axis, but see
8.4 for anisotropic rock).

8.2.3 Record the distance,D, between platen contact points
(see Fig. 3). Record the specimen width,W, perpendicular to
the loading direction, with an accuracy of65 %.

8.2.4 Steadily increase the load such that failure occurs
within 10 to 60 s, and record the failure load,P. The test should
be rejected if the fracture surface passes through only one
loading point (see Fig. 4(e)).

8.2.5 Procedures 8.2.2-8.2.4 are repeated for each test
specimen of the rock type.

8.3 Block and Irregular Lump Tests:
8.3.1 Rock blocks or lumps, 30 to 85 mm, and of the shape

shown in Fig. 3(c) and (d) are suitable for the block and the
irregular lump tests. The ratio,D/W, should be between1⁄3 and
1, preferably close to 1. The distanceL should be at least 0.5
W.

NOTE 1—Legend: L5 length, W5 width, D 5 depth or diameter, and De 5 equivalent core diameter (see 9.1).
FIG. 3 Load Configurations and Specimen Shape Requirement for (a) the Diametral Test, (b) the Axial Test, (c) the Block Test, and (d)

the Irregular Lump Test

D 5731

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