Which one of the following is employed to determine strength of hardened existing concrete structure ?

Which one of the following is employed to determine strength of harden

1.	Which one of the following is employed to determine strength of hardened existing concrete structure ?
A.	Bullet test
B.	Kelly ball test
C.	Rebound hammer test
D.	Cone penetrometer
Answer» D. Cone penetrometer

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Which one of the following is employed to determine strength of hardened existing concrete structure ?

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