C correct answers ASTM Standard dealing with capping cylindrical concrete specimens?
[A.] C39
[B.] C78
[C.] C617
[D.] C1231
Planeness and Perpendicularity correct answers The procedure for capping enables concrete cylinders to meet the standard's requirements for ____ and ____
plates, ali...
ASTM ACI Concrete Strength Testing Lab Technician ||
100% ACCURATE ANSWERS.
C correct answers ASTM Standard dealing with capping cylindrical concrete specimens?
[A.] C39
[B.] C78
[C.] C617
[D.] C1231
Planeness and Perpendicularity correct answers The procedure for capping enables concrete
cylinders to meet the standard's requirements for ____ and ____
plates, alignment, melting correct answers equipment needed for the capping process include
____, ____ devices, and ____ pots
glass, metal, granite, diabase correct answers Plates for neat cement and high-strength
gypsum plaster caps should be made of ____, ____, ____, or ____
metal or stone correct answers Sulfur mortar caps should be formed against _____ or _____
plates
B correct answers The purpose of the guide bar or bullseye level is that caps remain
perpendicular to the axis of the cylinder within ____
[A.] 0.25°
[B.] 0.5°
[C.] 2°
[D.] 2.5°
[D.] 5°
peripheral heating correct answers to avoid accidents during reheating, use melting pots that
have _____ _____
A correct answers The technician should use a stiff layer of _____ to cap fresh concrete
cylinders.
[A.] Neat Cement Paste
[B.] High-Strength Gypsum Paste
[C.] Sulfur Mortar
[D.] any of the above
D correct answers Hardened concrete cylinders should be capped with ____.
[A.] Neat Cement Paste
[B.] Gypsum Cement Paste
[C.] Sulfur Mortar
[D.] any of the above
False correct answers [True/False] Plaster of Paris and Portland Cement are examples of
suitable high-strength plasters.
, C correct answers Sulfur mortars and high strength gypsum cement cubes must demonstrate a
minimum compressive strength of _____ or the cylinder's strength; whichever is greater.
[A.] 3.5 MPa (500 psi)
[B.] 10 MPa (1500 psi)
[C.] 35 MPa (5000 psi)
[D.] 50 MPa (7000 psi)
[E.] 80 MPa (12000 psi)
D correct answers Neat cement paste should be applied to the freshly molded cylinders from
_____ to ______ hours after molding. This is to allow ______ of the concrete specimen.
A correct answers The strength of neat cement paste does NOT depend on:
[A.] equipment used
[B.] water-cement ratio
[C.] time
[D.] type of cement
excess paste, voids correct answers A slight twisting motion will help eliminate _____ and air
_____ when the capping plate is placed onto the mound of paste.
shrink, crack correct answers Neat cement paste caps should not be used on dry specimens
because the caps may _____ and _____ when dry.
oily, waxing correct answers The technician should remove all _____ or _____ materials
from the ends of hardened concrete cylinders before capping
Empty, 5 correct answers _____ 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 correct answers [True/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.
foaming, water correct answers To avoid _____, the sulfur mortar should be dry when it is
added to the pot. It should be kept away from _____ when heating.
hood, exhaust correct answers The melting pot for the sulfur mortar must have a _____ and
_____ for venting.
nausea, stomach distress, dizziness, headache, eye irritation correct answers Hydrogen
Sulfide gas, which may be produced during capping, may be deadly in high concentrations.
In lower concentrations, the gas may result in: (5 answers)
D correct answers ASTM Standard dealing with the use of unbonded caps in determination of
compressive strength of hardened concrete cylinders?
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