ASTM C39/C39M
Standard Test Method for
Compressive Strength of
Cylindrical Concrete
Specimens.
This test method is limited to concrete having a density greater than ______. - ANSWERS800
kg/m³ [50 lb/ft³]
The compressive strength of a specimen is calculated by dividing the ______ attained during the
test by the ______ of the specimen. - ANSWERSmaximum load; cross-sectional area
Values obtained will depend on the ______, ______, ______, the methods of ______, ______,
and ______, and the ______, ______, and ______ during curing. - ANSWERSsize and shape of
specimen, batching, mixing procedures; sampling, molding, fabrication; age, temperature,
moisture conditions
Verification of testing machine accuracy is required ______, ______, ______, or ______. -
ANSWERSwithin 13 months of the last calibration; on installation or immediately after
relocation; immediately after making repairs or adjustments; whenever there is reason to
suspect the accuracy of indicated loads
The machine must be ______ and must apply the load ______. - ANSWERSpower operated;
continuously
The percentage of error for the loads within the proposed range of use of the testing machine
shall not exceed ______ of the indicated load - ANSWERS±1.0%
Standard Test Method for
Compressive Strength of
Cylindrical Concrete
Specimens.
This test method is limited to concrete having a density greater than ______. - ANSWERS800
kg/m³ [50 lb/ft³]
The compressive strength of a specimen is calculated by dividing the ______ attained during the
test by the ______ of the specimen. - ANSWERSmaximum load; cross-sectional area
Values obtained will depend on the ______, ______, ______, the methods of ______, ______,
and ______, and the ______, ______, and ______ during curing. - ANSWERSsize and shape of
specimen, batching, mixing procedures; sampling, molding, fabrication; age, temperature,
moisture conditions
Verification of testing machine accuracy is required ______, ______, ______, or ______. -
ANSWERSwithin 13 months of the last calibration; on installation or immediately after
relocation; immediately after making repairs or adjustments; whenever there is reason to
suspect the accuracy of indicated loads
The machine must be ______ and must apply the load ______. - ANSWERSpower operated;
continuously
The percentage of error for the loads within the proposed range of use of the testing machine
shall not exceed ______ of the indicated load - ANSWERS±1.0%
