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The following calculations are used in this test:
Uncorrected Point Load Strength Index
Is = P / De2
where,
Is = Uncorrected point load strength
P = Failure load
De = Equivalent core diameter
for diametral tests
De = D
for axial, block and lump tests
De2 = 4 * A / π
Corrected Point Load Strength Index
Is(50) = F * Is
where,
Is(50) = Corrected point load strength index
F = Size correction factor
Compressive Strength
δuc = C * Is(50)
where,
δuc = Uniaxial compressive strength
C = Correlation factor