ACI - Concrete Strength Technician Training || WITH
ANSWERS 100% PASSED!!
Standard Practice for Capping Cylindrical Concrete Specimens correct answers ASTM C617
Procedures for capping enable concrete cylinders and cores to meet C617's practice
requirements for___ and___. correct answers Perpendicularity, Planeness
___ can be made of glass, machined metal, polished granite, or diabase. (C617) correct
answers Capping plates
Sulfur caps can be formed against ___ or___ plates. correct answers Metal, stone
The working surface of a capping plate shall not depart from plane by more than___ mm.
correct answers 0.05
Device used in conjunction with a capping plate to ensure perpendicularity. correct answers
Alignment device
Perpendicularity requirement of the axis of a cylindrical specimen. (degrees) correct answers
0.5
The element of a melting pot that ensures against accidents during reheating of cooled sulfur.
correct answers Peripheral Heating
Temperature of the sulfur mortar pot/materials. correct answers 265-290 F
Capping material to be used on freshly molded cylinders. correct answers Neat Portland
Cement paste
Remove this from the end of cylinders before capping. correct answers Oily or Waxy
materials
Materials that can be used to cap hardened cement concrete cylinders. correct answers Neat
Portland Cement, Gypsum Cement, Sulfur
T/F Plaster of paris is an example of a high-strength plaster correct answers False
Sulfur and gypsum cubes much show this compressive strength or the cylinder strength,
whichever is greater. correct answers 5000 psi
Strength of the paste depends on___, ___, and___. correct answers Water cement ratio, time,
type of cement
These are avoided when a slight twisting motion is applied while capping. correct answers
Air voids and excess paste
Sulfur material should not be used more than ___ times. correct answers 5
, T/F When capping concrete cylinders with a compressive strength of 5000 psi or greater, it is
permitted to reuse compound recovered from the capping operation of old caps. correct
answers False
Sulfur mortar should be kept away from this while heating. correct answers Water
Sulfur mortar should be kept under a ___ with an___ for venting. correct answers Hood,
exhaust
Standard Practice for use of unbonded caps in determination of compressive strength of
hardened concrete cylinders. correct answers ASTM C1231
Thickness of pads (C1231) in Inches correct answers 1/2
Durometer used in C1231 with a tolerance of +/-5. correct answers Shore A
Type of pad with classifications in C1231. correct answers Neoprene
Height of the retaining ring used in unbonded capping. in inches correct answers 1
The inside diameter of the retaining ring shall be within ___ of the diameter of the cylinder.
correct answers 102-107%
Thickness of the retaining ring for 6 in and 4 in specimens respectively. correct answers 12
mm, 9 mm
The bearing surfaces shall not have gouges or grooves greater than this depth. (mm) correct
answers 0.25
Cylinders should be made in accordance with one of these procedures. correct answers C31
or C192
Depressions in the concrete cylinder shall not exceed___in., with grinding, sawing or capping
being the correction. correct answers 0.20
When tests are made to establish a permissible number of reuses, the tests within ___ of the
highest strength level will be included in the reuse count. correct answers 2000 psi
Qualification tests of unbonded caps are to be performed by___. correct answers
Supplier/tester
T/F C1231 establishes a maximum number of pad reuses that may not be exceeded under any
circumstances. correct answers False
Psi range in which unbonded caps can be used. correct answers 1500-12,000
T/F Polyurthane or butyl pads with a hardness of 50 that will be used on concrete with a
compressive strength of 1500-6000 psi need not be qualified prior to use. correct answers
False
ANSWERS 100% PASSED!!
Standard Practice for Capping Cylindrical Concrete Specimens correct answers ASTM C617
Procedures for capping enable concrete cylinders and cores to meet C617's practice
requirements for___ and___. correct answers Perpendicularity, Planeness
___ can be made of glass, machined metal, polished granite, or diabase. (C617) correct
answers Capping plates
Sulfur caps can be formed against ___ or___ plates. correct answers Metal, stone
The working surface of a capping plate shall not depart from plane by more than___ mm.
correct answers 0.05
Device used in conjunction with a capping plate to ensure perpendicularity. correct answers
Alignment device
Perpendicularity requirement of the axis of a cylindrical specimen. (degrees) correct answers
0.5
The element of a melting pot that ensures against accidents during reheating of cooled sulfur.
correct answers Peripheral Heating
Temperature of the sulfur mortar pot/materials. correct answers 265-290 F
Capping material to be used on freshly molded cylinders. correct answers Neat Portland
Cement paste
Remove this from the end of cylinders before capping. correct answers Oily or Waxy
materials
Materials that can be used to cap hardened cement concrete cylinders. correct answers Neat
Portland Cement, Gypsum Cement, Sulfur
T/F Plaster of paris is an example of a high-strength plaster correct answers False
Sulfur and gypsum cubes much show this compressive strength or the cylinder strength,
whichever is greater. correct answers 5000 psi
Strength of the paste depends on___, ___, and___. correct answers Water cement ratio, time,
type of cement
These are avoided when a slight twisting motion is applied while capping. correct answers
Air voids and excess paste
Sulfur material should not be used more than ___ times. correct answers 5
, T/F When capping concrete cylinders with a compressive strength of 5000 psi or greater, it is
permitted to reuse compound recovered from the capping operation of old caps. correct
answers False
Sulfur mortar should be kept away from this while heating. correct answers Water
Sulfur mortar should be kept under a ___ with an___ for venting. correct answers Hood,
exhaust
Standard Practice for use of unbonded caps in determination of compressive strength of
hardened concrete cylinders. correct answers ASTM C1231
Thickness of pads (C1231) in Inches correct answers 1/2
Durometer used in C1231 with a tolerance of +/-5. correct answers Shore A
Type of pad with classifications in C1231. correct answers Neoprene
Height of the retaining ring used in unbonded capping. in inches correct answers 1
The inside diameter of the retaining ring shall be within ___ of the diameter of the cylinder.
correct answers 102-107%
Thickness of the retaining ring for 6 in and 4 in specimens respectively. correct answers 12
mm, 9 mm
The bearing surfaces shall not have gouges or grooves greater than this depth. (mm) correct
answers 0.25
Cylinders should be made in accordance with one of these procedures. correct answers C31
or C192
Depressions in the concrete cylinder shall not exceed___in., with grinding, sawing or capping
being the correction. correct answers 0.20
When tests are made to establish a permissible number of reuses, the tests within ___ of the
highest strength level will be included in the reuse count. correct answers 2000 psi
Qualification tests of unbonded caps are to be performed by___. correct answers
Supplier/tester
T/F C1231 establishes a maximum number of pad reuses that may not be exceeded under any
circumstances. correct answers False
Psi range in which unbonded caps can be used. correct answers 1500-12,000
T/F Polyurthane or butyl pads with a hardness of 50 that will be used on concrete with a
compressive strength of 1500-6000 psi need not be qualified prior to use. correct answers
False
