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will fail in a simple compression test. In this test method,
unconfined compressive strength is taken as the maximum load
attained per unit area or the load per unit area at 15 % axial
strain, whichever is secured first during the performance of a
test.
3.2.2 shear strength (s
u
)—for unconfined compressive
strength test specimens, the shear strength is calculated to be
1
⁄
2
of the compressive stress at failure, as defined in 3.2.1.
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