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As shown, changes in the LOK-force in kN’s, causes proportional changes in compressive strength in MPa.

LOK-TEST Correlations and Confidence Level

Recommended correlation between pullout force and standard cylinder compressive strength.

The 95% confidence levels between the LOK-TEST and cylinder strength, for aggregates sizes 16 mm and 32 mm.

Other methods, such as ultrasound and rebound hammers, have a large change in compressive strength for a modest increase in the velocity or rebound number.

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