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ACI Concrete Strength Testing
Technician CP-19 (14) Certified Q&A
2026
The term "unbonded cap" refers to the combination of a metal retainer and an
elastomeric pad. True or False? - correct-answer-True
The practice of ASTM C1231 may be used instead of the capping requirements
ASTM C617. True or False? - correct-answer-True
The pads provide a uniform distribution of load from the bearing blocks of the
testing machine by deforming in initial loading to conform to the contour of the
ends of the cylinder. True or False? - correct-answer-True
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When qualifying unbonded caps, strengths below ____% of the average obtained
from bonded caps is considered unacceptable. - correct-answer-98%
The practice of ASTM C1231 contains step-by-step procedures for aligning the
specimens in the testing machine through complete failure of the cylinder. True
or False? - correct-answer-False; only through initial application of the load
The pads used in this practice (ASTM C1231) must be _____ thick, and the
diameter shall not be more than _____ smaller than the inside diameter of the
retaining ring. - correct-answer-1/2 ± 1/16 in., 1/16 in.
The height of the metal retaining ring must be _____. - correct-answer-1.0 ± 0.1
in.
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The inside diameter of the retaining rings shall not be less than _____ or greater
than _____ of the diameter of the cylinder. - correct-answer-102%, 107%
Neither end of the cylinder shall depart from perpendicularity by more than
_____. - correct-answer-0.5 degrees
Depressions in the ends of the cylinders that exceed ____ must be corrected by
sawing or grinding prior to testing. - correct-answer-.20 in.
Pads that have cracks or splits exceeding ______ in _____ regardless of their
_____ must be replaced. - correct-answer-3/8 in., 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
ACI Concrete Strength Testing
Technician CP-19 (14) Certified Q&A
2026
The term "unbonded cap" refers to the combination of a metal retainer and an
elastomeric pad. True or False? - correct-answer-True
The practice of ASTM C1231 may be used instead of the capping requirements
ASTM C617. True or False? - correct-answer-True
The pads provide a uniform distribution of load from the bearing blocks of the
testing machine by deforming in initial loading to conform to the contour of the
ends of the cylinder. True or False? - correct-answer-True
,2|Page
When qualifying unbonded caps, strengths below ____% of the average obtained
from bonded caps is considered unacceptable. - correct-answer-98%
The practice of ASTM C1231 contains step-by-step procedures for aligning the
specimens in the testing machine through complete failure of the cylinder. True
or False? - correct-answer-False; only through initial application of the load
The pads used in this practice (ASTM C1231) must be _____ thick, and the
diameter shall not be more than _____ smaller than the inside diameter of the
retaining ring. - correct-answer-1/2 ± 1/16 in., 1/16 in.
The height of the metal retaining ring must be _____. - correct-answer-1.0 ± 0.1
in.
, 3|Page
The inside diameter of the retaining rings shall not be less than _____ or greater
than _____ of the diameter of the cylinder. - correct-answer-102%, 107%
Neither end of the cylinder shall depart from perpendicularity by more than
_____. - correct-answer-0.5 degrees
Depressions in the ends of the cylinders that exceed ____ must be corrected by
sawing or grinding prior to testing. - correct-answer-.20 in.
Pads that have cracks or splits exceeding ______ in _____ regardless of their
_____ must be replaced. - correct-answer-3/8 in., 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
