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Lab Services: Rock testing

Lab Services: Rock testing

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Test Method Title

Standard Test Method for Direct Tensile Strength of Intact Rock Core Specimens

Reference Number

ASTM D2936



Test Property

Tensile strength

Description of Test

A rock core sample is cut to length and its ends are cemented to metal caps. The metal caps are attached to a testing machine and the specimen is loaded in tension until it fails. Rock is much weaker in tension than in compression. Thus, in determining the failure condition for a rock structure, many investigators employ tensile strength for the structure. Direct tensile stressing of rock is the most basic test for determining the tensile strength of rock.

Preferred Test Sample Size

Rock core specimens

Number of Test Specimens

Enough samples to represent a valid average of the type of rock under consideration

Test Specimen Size

Right circular cylinder, with diameter of at least 1 7/8 in and a length to diameter ratio of 2 to 2.5:1


Rock, Rock Tensile Strength, Tension Properties, Tension Tests, direct tension

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