ASTM ACI Concrete Strength Testing Lab Technician, Questions and Correct Answers, With Complete Solution.
C617
ASTM Standard dealing with proper capping methods
Planeness and Perpendicularity
The procedure for capping enables concrete cylinders to meet the standard's requirements for ____ and...
ASTM ACI Concrete Strength Testing Lab
Technician, Questions and Correct Answers, With
Complete Solution.
C617
ASTM Standard dealing with proper capping methods
Planeness and Perpendicularity
The procedure for capping enables concrete cylinders to meet the standard's
requirements for ____ and ____
plates, alignment, melting
equipment needed for the capping process include ____, ____ devices, and ____ pots
glass, metal, granite, diabase
Plates for neat cement and high-strength gypsum plaster caps should be made of ____,
____, ____, or ____
metal or stone
Sulfur mortar cap plates should be formed against _____ or _____
.5
The purpose of the guide bar or bullseye level is that caps remain perpendicular to the
axis of the cylinder within _____ degrees
peripheral heating
to avoid accidents during reheating, use melting pots that have _____ _____
Neat Cement Paste
The technician should use a stiff layer of _____ to cap fresh concrete cylinders.
high strength gypsum paste, neat cement paste or sulfur mortar
Hardened concrete cylinders should be capped with _____ _____ _____ _____, _____
_____ _____, or _____ _____.
False- They are not suitable
Plaster of Paris and Portland Cement are examples of suitable high-strength plasters.
True or False?
5000 psi or 35 MPa or the cylinder's strength
Sulfur mortars and high strength gypsum cement cubes must demonstrate a minimum
compressive strength of _____ or _____; whichever is greater.
2 to 4, setting
The cement paste should be applied to the freshly molded cylinders from _____ to
______ hours after molding. This is to allow ______ of the concrete specimen.
a, b, d
The strength of the cement paste depends on: Choose all that apply:
a) water-cement ratio
b) time
c) equipment used
d) type of cement
excess paste, voids
, A slight twisting motion will help eliminate _____ and air _____ when the capping plate
is placed onto the mound of paste.
shrink, crack
Neat cement paste caps should not be used on dry specimens because the caps may
_____ and _____ when dry.
oily, waxing
The technician should remove all _____ or _____ materials from the ends of hardened
concrete cylinders before capping
Empty, 5
_____ 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.
False
When capping concrete cylinders with a compressive strength of 5000 psi (35 MPa) or
greater it is permitted to reuse compound recovered from the capping operation of old
caps. True or false?
foaming, water
To avoid _____, the sulfur mortar should be dry when it is added to the pot. It should be
kept away from _____ when heating.
hood and exhaust for venting
The melting pot for the sulfur mortar must have a _____ and _____ for _____
deadly. nausea, stomach distress, dizziness, headache, eye irritation
Hydrogen Sulfide gas, which may be produced during capping, may be _____ in high
concentrations. In lower concentrations, the gas may result in: (5 answers)
Unbonded caps
ASTM C1231 deals with the practice of using ______ _____
supplier, user
When qualification tests of unbounded pads are required, they are performed by the
______ or ______
False
ASTM C1231 establishes a maximum number of pad reuses that may not be exceeded
under any circumstances. True of false?
1500 psi (10 MPa) - 12000 psi (80 MPa)
Unbonded caps are not to be used for acceptance testing of concrete with compressive
strength below _____ or above _____.
False
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 need not be qualified prior
to use. True or False?
Date the pads were placed in service, the pad durometer, and number of uses
To keep track of pad usage, the user is required to maintain records that include:
True
If a new neoprene pad with a Shore A durometer hardness of 50 is intended to test
concrete cylinders with an anticipated compressive strength between 1500 and 6000
psi, it may be used "as is" from the manufacturer without further qualification testing.
True or false?
True
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