ACI LATEST EXAM PREP QUESTIONS AND
ANSWERS PDF 2026
▶ 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?.
Answer: True
▶ The term "unbonded cap" refers to the combination of a metal retainer
and an elastomeric pad. True or False?. Answer: True
▶ The practice of ASTM C1231 may be used instead of the capping
requirements ASTM C617. True or False?. 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?. Answer: True
▶ When qualifying unbonded caps, strengths below ____% of the average
obtained from bonded caps is considered unacceptable.. 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?. 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.. Answer: 1/2 ± 1/16 in., 1/16 in.
▶ The height of the metal retaining ring must be _____.. 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.. Answer: 102%, 107%
, ▶ Neither end of the cylinder shall depart from perpendicularity by more
than _____.. Answer: 0.5 degrees
▶ Depressions in the ends of the cylinders that exceed ____ must be
corrected by sawing or grinding prior to testing.. Answer: .20 in.
▶ Pads that have cracks or splits exceeding ______ in _____ regardless of
their _____ must be replaced.. 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 when using pad caps, since the pad's deformation will
compensate and provide uniform loading. True or False?. Answer: False
▶ After application of the load, but before reaching _____ of the anticipated
specimen strength, check to see that the axis of the cylinder does not
depart from vertical by more than _____.. Answer: 10%, 0.5 degrees
▶ Qualification tests on an unbonded capping system must be repeated
when ever there are changes in _____.. Answer: The design or
dimensions of the retaining rings, pad composition or thickness, or the
Shore A hardness by more than 5 units
▶ This test (ASTM C39) measures the compressive strength of cylindrical
concrete specimens that have a density of less than 50 lb/ft. True or
False?. Answer: False; have a density of more than 50 lb/ft.
▶ The test method of ASTM C39 consists of applying a compressive
coaxial load to molded cylinders or cores at any rate True or False?.
Answer: False, a prescribed rate
▶ 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
▶ This test method (ASTM C39) is used to determine ______ _____ of
cylindrical specimens.. Answer: Compressive strength
ANSWERS PDF 2026
▶ 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?.
Answer: True
▶ The term "unbonded cap" refers to the combination of a metal retainer
and an elastomeric pad. True or False?. Answer: True
▶ The practice of ASTM C1231 may be used instead of the capping
requirements ASTM C617. True or False?. 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?. Answer: True
▶ When qualifying unbonded caps, strengths below ____% of the average
obtained from bonded caps is considered unacceptable.. 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?. 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.. Answer: 1/2 ± 1/16 in., 1/16 in.
▶ The height of the metal retaining ring must be _____.. 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.. Answer: 102%, 107%
, ▶ Neither end of the cylinder shall depart from perpendicularity by more
than _____.. Answer: 0.5 degrees
▶ Depressions in the ends of the cylinders that exceed ____ must be
corrected by sawing or grinding prior to testing.. Answer: .20 in.
▶ Pads that have cracks or splits exceeding ______ in _____ regardless of
their _____ must be replaced.. 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 when using pad caps, since the pad's deformation will
compensate and provide uniform loading. True or False?. Answer: False
▶ After application of the load, but before reaching _____ of the anticipated
specimen strength, check to see that the axis of the cylinder does not
depart from vertical by more than _____.. Answer: 10%, 0.5 degrees
▶ Qualification tests on an unbonded capping system must be repeated
when ever there are changes in _____.. Answer: The design or
dimensions of the retaining rings, pad composition or thickness, or the
Shore A hardness by more than 5 units
▶ This test (ASTM C39) measures the compressive strength of cylindrical
concrete specimens that have a density of less than 50 lb/ft. True or
False?. Answer: False; have a density of more than 50 lb/ft.
▶ The test method of ASTM C39 consists of applying a compressive
coaxial load to molded cylinders or cores at any rate True or False?.
Answer: False, a prescribed rate
▶ 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
▶ This test method (ASTM C39) is used to determine ______ _____ of
cylindrical specimens.. Answer: Compressive strength
