Why is a spherically seated bearing block required in testing cylinders?

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Why is a spherically seated bearing block required in testing cylinders?

Q. Why is a spherically seated bearing block required in testing cylinders?

 

A. A spherically seated bearing block is necessary to ensure a concentric load on the end of the specimen, because not all specimens have perfectly parallel ends even when capped.

 

References: SP-1(02)

Topics in Concrete: Testing of Concrete