ACI Concrete Strength Testing Technician
CP-19 (14) {latest 2026 -2027 update}
questions and answers 100% correct
if a new neoprene pad with a Shore A durometer hardness of 50 is intended to test
concrete cylinders with anticipated compressive strengths between 1500 and 6000 psi
(10 and 40 MPa), it may be used "as is" from the manufacturer without further
qualification testing. True or False? - correct answer True
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
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.
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
CP-19 (14) {latest 2026 -2027 update}
questions and answers 100% correct
if a new neoprene pad with a Shore A durometer hardness of 50 is intended to test
concrete cylinders with anticipated compressive strengths between 1500 and 6000 psi
(10 and 40 MPa), it may be used "as is" from the manufacturer without further
qualification testing. True or False? - correct answer True
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
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.
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
