These procedures for capping enable concrete cylinders and cores to meet the standard practice's requirements for _____ and _____. correct answers Planeness; Perpendicularity
Equipment needed for the capping process includes capping _____, _____ devices, and _____ pots. correct answers Plates; a...
ACI Concrete Strength Testing Technician Review (25th
Ed.) RATED 100% CORRECT SOLUTIONS
These procedures for capping enable concrete cylinders and cores to meet the standard
practice's requirements for _____ and _____. correct answers Planeness; Perpendicularity
Equipment needed for the capping process includes capping _____, _____ devices, and
_____ pots. correct answers Plates; alignment; melting
Plates for neat cement and high-strength gypsum plaster caps should be made of _____,
_____, _____, or _____. correct answers Glass; Metal; Granite; Diabase
Sulfur mortar cap plates should be formed against _____ or _____ plates. correct answers
Metal; Granite or diabase
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 answers True
To avoid accidents during the reheating of cooled sulfur, use melting pots that have _____.
correct answers Peripheral Heating
Hardened concrete cylinders should be capped with _____,_____,_____, or _____. correct
answers High-Strength gypsum paste; neat cement paste; 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 answers False
Sulfur mortars and high-strength gypsum cement cubes must demonstrate a minimum
compressive strength of _____ or _____, whichever is greater. correct answers 5000 psi
[35MPa]; Cylinder Strength
The cement paste should be applied to the freshly molded cylinder from _____ hours after
molding. This is to allow for _____ of the concrete speciment. correct answers 2 to 4; settling
Select all that apply: The strength of the neat cement paste depends on:
A. The water-cement ratio
B. Curing Time/ Age of cap
C. The equipment used
D. Type of Cement correct answers A, B, D
The slight twisting action will help eliminate _____ and air _____ when capping plate is
placed onto the mound of neat cement paste. correct answers Excess Paste, Voids
Neat cement paste caps should not be used on dry specimens because the caps may _____
and _____ when dry. correct answers Shrink; Crack
The technician should remove all _____ or _____ materials from the ends of hardened
concrete cylinders before capping. correct answers Oily; Waxy
, _____ the pot and recharge with fresh material at intervals to ensure that the oldest material
in the pot has not been used more than _____ times. correct answers Empty; Five
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 or old caps.
True or False? correct answers False
To avoid _____, the sulfur mortar should be dry when is is added to the pot. It should be kept
away from _____ when heating. correct answers Foaming; Water
The melting pot for the sulfur mortar must be located under a(n) _____, with a(n) _____ for
_____. correct answers Hood; Exhaust Fan; Ventilation
Hydrogen sulfide gas, which may be produced during capping, may be _____ in high
concentrations. In lower concentrations, the gas may result in _____,_____,_____,_____, and
_____. correct answers Lethal; Nausea; Stomach Distress; Dizziness; Head-Ache; Eye-
Irritation.
When qualification tests of unbonded pads are required, they are performed by the _____ or
_____. correct answers Supplier; User
This standard practice establishes a maximum number of pad used that may not be exceeded
under any circumstances. True or False? correct answers False
Unbonded caps are not to be used for acceptance testing of concrete with compressive
strength below _____ or above _____. correct answers 1500 psi; 12000 psi
Polyurethane or butyl pads with a Shore A durometer hardness of 50 that will be used on
concrete with a compressive strength of 10 to 40 MPa [1500 to 6000 psi] need not be
qualified prior to use. True or False? correct answers False
To keep track of pad usage, the user is required to maintain records that include _____,
_____, and ___ correct answers 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
cylinder with anticipated compressive strengths between 10 and 40 MPa [1500 and 6000 psi],
it may be used "as is" from the manufacturer without further qualification testing. True or
False? correct answers True
The term "unbonded cap" refers to the combination of a metal retainer and an elastomeric
pad. True or False? correct answers True
Practice C1231/C1231M may be used instead of the capping requirements of Practice
C617/C617M. True or False? correct answers 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 answers True
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