ACI
ASTM ACI Concrete Strength Testing
Lab Technician Exam 2025
ASTM Standard dealing with proper capping methods -Correct Answer ✔C617
The procedure for capping enables concrete cylinders to meet the standard's
requirements for ____ and ____ -Correct Answer ✔Planeness and Perpendicularity
equipment needed for the capping process include ____, ____ 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, diabase
Sulfur mortar cap plates should be formed against _____ or _____ -Correct Answer
✔metal or stone
The purpose of the guide bar or bullseye level is that caps remain perpendicular to the
axis of the cylinder within _____ degrees -Correct Answer ✔.5
to avoid accidents during reheating, 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
ACI
, ACI
Hardened concrete cylinders should be capped with _____ _____ _____ _____, _____
_____ _____, or _____ _____. -Correct Answer ✔high strength gypsum paste, neat
cement paste or sulfur mortar
Plaster of Paris and Portland Cement are examples of suitable high-strength plasters.
True or False? -Correct Answer ✔False- They are not suitable
Sulfur mortars and high strength gypsum cement cubes must demonstrate a minimum
compressive strength of _____ or _____; whichever is greater. -Correct Answer ✔5000
psi or 35 MPa or the cylinder's strength
The cement paste should be applied to the freshly molded cylinders from _____ to
______ hours after molding. This is to allow ______ of the concrete specimen. -Correct
Answer ✔2 to 4, setting
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 -Correct Answer ✔a, b, d
A slight twisting motion will help eliminate _____ and air _____ when the capping plate
is placed onto the mound of 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
ACI
ASTM ACI Concrete Strength Testing
Lab Technician Exam 2025
ASTM Standard dealing with proper capping methods -Correct Answer ✔C617
The procedure for capping enables concrete cylinders to meet the standard's
requirements for ____ and ____ -Correct Answer ✔Planeness and Perpendicularity
equipment needed for the capping process include ____, ____ 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, diabase
Sulfur mortar cap plates should be formed against _____ or _____ -Correct Answer
✔metal or stone
The purpose of the guide bar or bullseye level is that caps remain perpendicular to the
axis of the cylinder within _____ degrees -Correct Answer ✔.5
to avoid accidents during reheating, 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
ACI
, ACI
Hardened concrete cylinders should be capped with _____ _____ _____ _____, _____
_____ _____, or _____ _____. -Correct Answer ✔high strength gypsum paste, neat
cement paste or sulfur mortar
Plaster of Paris and Portland Cement are examples of suitable high-strength plasters.
True or False? -Correct Answer ✔False- They are not suitable
Sulfur mortars and high strength gypsum cement cubes must demonstrate a minimum
compressive strength of _____ or _____; whichever is greater. -Correct Answer ✔5000
psi or 35 MPa or the cylinder's strength
The cement paste should be applied to the freshly molded cylinders from _____ to
______ hours after molding. This is to allow ______ of the concrete specimen. -Correct
Answer ✔2 to 4, setting
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 -Correct Answer ✔a, b, d
A slight twisting motion will help eliminate _____ and air _____ when the capping plate
is placed onto the mound of 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
ACI
