ASTM C39/C39M Standard Test Method for Compressive Strength of Cylindrical Concrete
Specimens TESTS WITH ANSWERS A+ GRADE.
When the bearing block exceeds the diameter of the specimen by more than ______, concentric circles
not more than ______ deep and not more than ______ wide shall be inscribed to facilitate proper
centering. - 13 mm [0.5 in]; 0.8 mm [0.03 in]; 1 mm [ 0.04 in]
Except for concentric circles, the surface of the bearing blocks may not depart from a plane by more than
______ in any ______. - 0.02 mm [0.001 in]; 150 mm [6 in]
The ______and ______ of the spherically seated block must be designed so the steel in the contact area
doesn't permanently deform when loaded to the capacity of the testing machine. - ball; socket
The curved surface of the socket should be kept ______ and lubricated with ______. - clean; petroleum-
based oil
The ______ should provide a readily machinable surface for maintenance of the specified surface
conditions - bottom bearing block
Specimens should not be tested if any individual diameter of a cylinder differs from another diameter by
more than ______. - 2%
If cylinders have been made from a single lot of molds which consistently produce nearly the same sized
specimens, the number of individual cylinders measured is not prohibited from being ______ to one for
each ______ specimens or ______ per day, whichever is greater. - reduced; ten; three
T or F: When conducting compression tests of moist-cured specimens, wait at least three days after their
removal from moist storage before testing. - False (Specimens should be kept in the moist condition until
the time of testing)
When placing the lower bearing block on the table or platen, place the ______ side up. - hardened
Align the ______ of the specimen with the ______ of the spherically-seated block. - Axis; center of thrust
Specimens TESTS WITH ANSWERS A+ GRADE.
When the bearing block exceeds the diameter of the specimen by more than ______, concentric circles
not more than ______ deep and not more than ______ wide shall be inscribed to facilitate proper
centering. - 13 mm [0.5 in]; 0.8 mm [0.03 in]; 1 mm [ 0.04 in]
Except for concentric circles, the surface of the bearing blocks may not depart from a plane by more than
______ in any ______. - 0.02 mm [0.001 in]; 150 mm [6 in]
The ______and ______ of the spherically seated block must be designed so the steel in the contact area
doesn't permanently deform when loaded to the capacity of the testing machine. - ball; socket
The curved surface of the socket should be kept ______ and lubricated with ______. - clean; petroleum-
based oil
The ______ should provide a readily machinable surface for maintenance of the specified surface
conditions - bottom bearing block
Specimens should not be tested if any individual diameter of a cylinder differs from another diameter by
more than ______. - 2%
If cylinders have been made from a single lot of molds which consistently produce nearly the same sized
specimens, the number of individual cylinders measured is not prohibited from being ______ to one for
each ______ specimens or ______ per day, whichever is greater. - reduced; ten; three
T or F: When conducting compression tests of moist-cured specimens, wait at least three days after their
removal from moist storage before testing. - False (Specimens should be kept in the moist condition until
the time of testing)
When placing the lower bearing block on the table or platen, place the ______ side up. - hardened
Align the ______ of the specimen with the ______ of the spherically-seated block. - Axis; center of thrust
