ACI ASTM CONCRETE STRENGTH TESTING LAB TECHNICIAN EXAM
QUESTIONS AND CORRECT ANSWERS 2025-2026
Results obtained from the compressive strength test
method will depend on many things, such as the size and
____ of the specimen, batching, _____ procedures, the
age, temperature and _____ conditions during curing. -
ANSWER-shape, mixing, moisture
ASTM C39 is used to determine ____ _____ of cylindrical
specimens. - ANSWER-Compressive Strength
The calibration of the testing machines must be
verified under 4 conditions: at least ____, upon
original installation, or after _____, after making
_____ or adjustments, and whenever there is reason to
suspect the _____ of the indicated load - ANSWER-
annually, relocation, repairs, accuracy
The pads used in this practice must be _____ thick, and
the the diameter shall not be more than _____ smaller
than the inside diameter of the retaining ring. -
ANSWER-3 +- 2mm (1/2" +- 1/16"), 2mm (1/16")
The height of the metal retaining ring must be ______.
- ANSWER-25 +- 3mm (1 in +- .1 in)
The inside diameter of the retaining rings shall not be
less than ______ or greater than _______ of the
diameter of the cylinder - ANSWER-102 %, 107 %
, Neither end of the cylinder shall depart from
perpendicularity by more than ________ degrees -
ANSWER-.5 degrees
Depressions in the ends of cylinders that exceed
_______ must be corrected by sawing or grinding prior
to testing. - ANSWER-5mm (.2 in)
pads that have cracks or splits exceeding ______ in
_____ regardless of their _______ must be replaced -
ANSWER-3/8 in (10mm), length, depth
Rotation of the movable portion of the testing
machine's spherically seated bearing block as it is
brought to bear on the upper retaining ring is not
necessary when using pad caps, since the pad's
deformation will compensate and provide uniform
loading. True or false? - ANSWER-False
qualification tests on an unbonded capping system must
be repeated whenever there are changes in: (3 answers)
- ANSWER-the design or dimensions of the retaining
rings, pad composition or thickness, or the shore A
hardness by more than 5 units
After application of the load, but before ______ of the
anticipated specimen strength, check to see that the
axis of the cylinder is vertical within a tolerance of
_______. - ANSWER-50 %, 1/8 in 12
ASTM standard dealing with compressive strength of
cylindrical concrete specimens - ANSWER-C39
QUESTIONS AND CORRECT ANSWERS 2025-2026
Results obtained from the compressive strength test
method will depend on many things, such as the size and
____ of the specimen, batching, _____ procedures, the
age, temperature and _____ conditions during curing. -
ANSWER-shape, mixing, moisture
ASTM C39 is used to determine ____ _____ of cylindrical
specimens. - ANSWER-Compressive Strength
The calibration of the testing machines must be
verified under 4 conditions: at least ____, upon
original installation, or after _____, after making
_____ or adjustments, and whenever there is reason to
suspect the _____ of the indicated load - ANSWER-
annually, relocation, repairs, accuracy
The pads used in this practice must be _____ thick, and
the the diameter shall not be more than _____ smaller
than the inside diameter of the retaining ring. -
ANSWER-3 +- 2mm (1/2" +- 1/16"), 2mm (1/16")
The height of the metal retaining ring must be ______.
- ANSWER-25 +- 3mm (1 in +- .1 in)
The inside diameter of the retaining rings shall not be
less than ______ or greater than _______ of the
diameter of the cylinder - ANSWER-102 %, 107 %
, Neither end of the cylinder shall depart from
perpendicularity by more than ________ degrees -
ANSWER-.5 degrees
Depressions in the ends of cylinders that exceed
_______ must be corrected by sawing or grinding prior
to testing. - ANSWER-5mm (.2 in)
pads that have cracks or splits exceeding ______ in
_____ regardless of their _______ must be replaced -
ANSWER-3/8 in (10mm), length, depth
Rotation of the movable portion of the testing
machine's spherically seated bearing block as it is
brought to bear on the upper retaining ring is not
necessary when using pad caps, since the pad's
deformation will compensate and provide uniform
loading. True or false? - ANSWER-False
qualification tests on an unbonded capping system must
be repeated whenever there are changes in: (3 answers)
- ANSWER-the design or dimensions of the retaining
rings, pad composition or thickness, or the shore A
hardness by more than 5 units
After application of the load, but before ______ of the
anticipated specimen strength, check to see that the
axis of the cylinder is vertical within a tolerance of
_______. - ANSWER-50 %, 1/8 in 12
ASTM standard dealing with compressive strength of
cylindrical concrete specimens - ANSWER-C39
