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ACI Concrete Strength Testing
Technician CP-19 (14)
These procedures for capping enable concrete cylinders and cores to meet the standard's
requirements for ________ and _________. - correct answer-Planeness, perpendicularity
Equipment needed for the capping process includes capping _____ , _____devices, and
______ pots. - correct answer-Plates, alignment, melting
Plates for neat cement and high strength gypsum plaster caps should be made of _____,
_____, _____ or _____. - correct answer-Glass, metal granite or diabase
Sulfur mortar cap plates should be formed against _____ or _____ plates. - correct
answer-Metal, Stone
The purpose of the guide bar or bull's eye level is to ensure that caps remain perpendicular
to the axis of the cylinder within 0.5 degrees. True or False? - correct answer-True
To avoid accidents during reheating of cooled sulfur, use melting pots that have _____. -
correct answer-Peripheral heating
The technician should use a stiff layer of _____ to cap fresh concrete cylinders. - correct
answer-Neat cement paste
Hardened concrete cylinders should be capped with _____, _____ or _____. - correct
answer-High-strength gypsum paste, neat cement paste, or sulfur mortar
Plaster of paris and mixtures of plaster of paris and portland cement are examples of
suitable high strength plasters. True or False? - correct answer-False
Sulfur mortars and high-strength gypsum cement cubes must demonstrate a minimum
compressive strength of _____ or ___ __, whichever is greater. - correct answer-35MPa
(5000 psi), the cylinder strength
The cement paste should be applied to the freshly molded cylinder from _____ to _____
hours after molding. This is to allow for _____ of the concrete specimen. - correct
answer-2,4, settling
The strength of the paste depends on:
a) the water-cement ratio
b) time
c) the equipment used
d) type of cement - correct answer-a, b and d
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A slight twisting action will help eliminate _____ and air _____ when the capping plate is
placed onto the mound of the paste. - correct answer-Excess paste, voids
Neat cement paste caps should not be used on dry specimens because the caps may _____
and _____ when dry. - correct answer-Shrink, crack
The technician should remove all _____ or _____ materials from the ends of hardened
concrete cylinders before capping - correct answer-Oily, waxy
_____ the pot and recharge with fresh material at intervals to insure that the oldest material
in the pot has not been used more than _____ times. - correct answer-Empty, 5
When capping concrete cylinders with a compressive strength of 35 MPa (5000 psi) or
greater, it is permitted to reuse compound recovered from the capping operation of old caps.
True or False? - correct answer-False
To avoid _____, the sulfur mortar should be dry when it is added to the pot. It should be kept
away from _____ when heating. - correct answer-Foaming, water
The melting pot for the sulfur mortar must be located under a _____ with an _____ for
_____. - correct answer-Hood, exhaust fan, ventillation
Hydrogen sulfide gas, which may be produced during capping, may be _____, _____,
_____, _____ and _____. - correct answer-Lethal, nausea, stomach distress, dizziness,
headache, irritation of the eyes.
When qualification tests of unbonded pads are required, they are performed by the _____ or
_____. - correct answer-Supplier, user
This standard (ASTM 1231) established a maximum number of pad reuses that may not be
exceeded under any circumstances. True or false? - correct answer-False
Unbonded caps are not to be used for acceptance testing of concrete with compressive
strength below _____ or above _____. - correct answer-1500 psi (10 MPa), 12,000 psi (80
MPa)
Polyurethane or butyl pads with a Shore A durometer hardness of 50 that will be used on
concrete with a compressive strength of 1500 to 6000 psi (10 to 40 MPa) need not be
qualified prior to use. True of False? - correct answer-False
To keep track of pad usage, the user is required to maintain records that include_____. -
correct answer-Date placed in service, pad durometer, number of uses
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
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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
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? - correct
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 _____. -
correct answer-10%, 0.5 degrees
Qualification tests on an unbonded capping system must be repeated when ever there are
changes in _____. - correct answer-The design or dimensions of the retaining rings, pad
composition or thickness, or the Shore A hardness by more than 5 units
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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? - correct 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? - correct 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. - correct answer-Shape, mixing moisture
This test method (ASTM C39) is used to determine ______ _____ of cylindrical specimens. -
correct answer-Compressive strength
The calibration of the testing machines must be verified under four conditions; within _____
months of the last calibration, upon original installation or after _____, after making _____ or
adjustments, and whenever there is a reason to suspect the ____ of the indicated loads. -
correct answer-13, relocation, repairs, accuracy
The machine must be power operated and apply the load intermittently. True or False? -
correct answer-False, apply the load continuously
Supplemental means of loading for calibration may be power or hand operated. True or
False? - correct answer-True
The percentage of error for loads used in the testing machine should not exceed _____ of
the indicated load. - correct answer-± 1.0%
The testing machine should have two steel bearing blocks; a spherically seated block and a
solid block. True or False? - correct answer-True
The _____ and _____ of the spherically seat bearing block must be designed so the steel in
the contact area doesn't permanently deform when loaded to the capacity of the testing
machine. - correct answer-Ball, socket
The curved surface of the socket should be _____ and lubricated with ______ at least every
_____ months. - correct answer-Clean, petroleum-type oil, six (or as specified by the
manufacturer of the test machine)
The _____ block should provide a readily machinable surface for maintenance of the
specified surface conditions. - correct answer-Bottom bearing
Specimens should not be tested if any individual diameter of a cylinder differs from another
diameter of the same cylinder by less than 2%. True or False? - correct answer-False, by
more than 2%
If cylinders have been made from a single lot of molds which consistently produce nearly the
same sized specimens, the number of individual cylinders measured is not prohibited from
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ACI Concrete Strength Testing
Technician CP-19 (14)
These procedures for capping enable concrete cylinders and cores to meet the standard's
requirements for ________ and _________. - correct answer-Planeness, perpendicularity
Equipment needed for the capping process includes capping _____ , _____devices, and
______ pots. - correct answer-Plates, alignment, melting
Plates for neat cement and high strength gypsum plaster caps should be made of _____,
_____, _____ or _____. - correct answer-Glass, metal granite or diabase
Sulfur mortar cap plates should be formed against _____ or _____ plates. - correct
answer-Metal, Stone
The purpose of the guide bar or bull's eye level is to ensure that caps remain perpendicular
to the axis of the cylinder within 0.5 degrees. True or False? - correct answer-True
To avoid accidents during reheating of cooled sulfur, use melting pots that have _____. -
correct answer-Peripheral heating
The technician should use a stiff layer of _____ to cap fresh concrete cylinders. - correct
answer-Neat cement paste
Hardened concrete cylinders should be capped with _____, _____ or _____. - correct
answer-High-strength gypsum paste, neat cement paste, or sulfur mortar
Plaster of paris and mixtures of plaster of paris and portland cement are examples of
suitable high strength plasters. True or False? - correct answer-False
Sulfur mortars and high-strength gypsum cement cubes must demonstrate a minimum
compressive strength of _____ or ___ __, whichever is greater. - correct answer-35MPa
(5000 psi), the cylinder strength
The cement paste should be applied to the freshly molded cylinder from _____ to _____
hours after molding. This is to allow for _____ of the concrete specimen. - correct
answer-2,4, settling
The strength of the paste depends on:
a) the water-cement ratio
b) time
c) the equipment used
d) type of cement - correct answer-a, b and d
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A slight twisting action will help eliminate _____ and air _____ when the capping plate is
placed onto the mound of the paste. - correct answer-Excess paste, voids
Neat cement paste caps should not be used on dry specimens because the caps may _____
and _____ when dry. - correct answer-Shrink, crack
The technician should remove all _____ or _____ materials from the ends of hardened
concrete cylinders before capping - correct answer-Oily, waxy
_____ the pot and recharge with fresh material at intervals to insure that the oldest material
in the pot has not been used more than _____ times. - correct answer-Empty, 5
When capping concrete cylinders with a compressive strength of 35 MPa (5000 psi) or
greater, it is permitted to reuse compound recovered from the capping operation of old caps.
True or False? - correct answer-False
To avoid _____, the sulfur mortar should be dry when it is added to the pot. It should be kept
away from _____ when heating. - correct answer-Foaming, water
The melting pot for the sulfur mortar must be located under a _____ with an _____ for
_____. - correct answer-Hood, exhaust fan, ventillation
Hydrogen sulfide gas, which may be produced during capping, may be _____, _____,
_____, _____ and _____. - correct answer-Lethal, nausea, stomach distress, dizziness,
headache, irritation of the eyes.
When qualification tests of unbonded pads are required, they are performed by the _____ or
_____. - correct answer-Supplier, user
This standard (ASTM 1231) established a maximum number of pad reuses that may not be
exceeded under any circumstances. True or false? - correct answer-False
Unbonded caps are not to be used for acceptance testing of concrete with compressive
strength below _____ or above _____. - correct answer-1500 psi (10 MPa), 12,000 psi (80
MPa)
Polyurethane or butyl pads with a Shore A durometer hardness of 50 that will be used on
concrete with a compressive strength of 1500 to 6000 psi (10 to 40 MPa) need not be
qualified prior to use. True of False? - correct answer-False
To keep track of pad usage, the user is required to maintain records that include_____. -
correct answer-Date placed in service, pad durometer, number of uses
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
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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
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? - correct
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 _____. -
correct answer-10%, 0.5 degrees
Qualification tests on an unbonded capping system must be repeated when ever there are
changes in _____. - correct answer-The design or dimensions of the retaining rings, pad
composition or thickness, or the Shore A hardness by more than 5 units
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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? - correct 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? - correct 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. - correct answer-Shape, mixing moisture
This test method (ASTM C39) is used to determine ______ _____ of cylindrical specimens. -
correct answer-Compressive strength
The calibration of the testing machines must be verified under four conditions; within _____
months of the last calibration, upon original installation or after _____, after making _____ or
adjustments, and whenever there is a reason to suspect the ____ of the indicated loads. -
correct answer-13, relocation, repairs, accuracy
The machine must be power operated and apply the load intermittently. True or False? -
correct answer-False, apply the load continuously
Supplemental means of loading for calibration may be power or hand operated. True or
False? - correct answer-True
The percentage of error for loads used in the testing machine should not exceed _____ of
the indicated load. - correct answer-± 1.0%
The testing machine should have two steel bearing blocks; a spherically seated block and a
solid block. True or False? - correct answer-True
The _____ and _____ of the spherically seat bearing block must be designed so the steel in
the contact area doesn't permanently deform when loaded to the capacity of the testing
machine. - correct answer-Ball, socket
The curved surface of the socket should be _____ and lubricated with ______ at least every
_____ months. - correct answer-Clean, petroleum-type oil, six (or as specified by the
manufacturer of the test machine)
The _____ block should provide a readily machinable surface for maintenance of the
specified surface conditions. - correct answer-Bottom bearing
Specimens should not be tested if any individual diameter of a cylinder differs from another
diameter of the same cylinder by less than 2%. True or False? - correct answer-False, by
more than 2%
If cylinders have been made from a single lot of molds which consistently produce nearly the
same sized specimens, the number of individual cylinders measured is not prohibited from
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