ACI STRENGTH EXAM STUDY GUIDE | QUESTIONS AND ANSWERS |
VERIFIED SOLUTIONS (100% CORRECT) | LATEST EXAM UPDATE
Name the two allowable materials with with concrete cylinders may be capped
with. - CORRECT ANSWER - I. High-strength gypsum
II. Sulfur mortar
III. Neat cement paste
Name the three materials with with cylinders may be capped against. - CORRECT
ANSWER - I. Glass
II. Metal
III. Granite
Prior to beginning the capping procedure, what must the metal plate be inspected
for? - CORRECT ANSWER - I. Grooves
II. Gouches
III. Indentations
What is the maximum allowable size of any indentation on the base plate? -
CORRECT ANSWER - 0.010 in [0.25 mm]
Upon receipt of the caping material, for how long can it be kept in intervals? -
CORRECT ANSWER - 3 months
When must the neat cement paste be applied it to the cylinder? - CORRECT
ANSWER - Immediately
,For how long must the concrete settle in the mold prior to applying the neat cement
paste? - CORRECT ANSWER - 2 to 4 hours
Prior to capping, name the three tasks that must be performed on the cylinder. -
CORRECT ANSWER - I. Inspect for any bumps greater than 1/8"
II. Remove foreign debris.
III. Remove any excess water or laitence.
What is the required position of the concrete cylinder? - CORRECT ANSWER -
90° ± 0.5°
Name the required temperature range of the heated sulfar mortar mixture. -
CORRECT ANSWER - 265°F to 290 °F [130 °C to 145 °C]
What is the maximum number of times that the heated sulfur may be used per
cylinder capping procedure? - CORRECT ANSWER - 5 times
These procedures for capping enable concrete cylinders and cores to meet the
standard practice's requirements for _____ and _____. - CORRECT ANSWER -
perpendicularity ... planeness ... perpendicularity
Equipment needed for the capping process includes capping ____ ____ 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 - metal ... glass .... granite
, Sulfar mortar cap plates should be formed against _____ or _____ plates. -
CORRECT ANSWER - marble ... stone
True or false? The purpose of the guide bar or bull's eye level is to ensure that caps
remain perpendicular to the axi of the cylinder within 0.5 degrees. - CORRECT
ANSWER - True
To avoid accidents during reheating of cooled sulfur, use melting pots that have
_____. - CORRECT ANSWER - Metal covers
The technician should use a stiff layer of _____ to cap fresh concrete cylinders. -
CORRECT ANSWER - Burlap
Hardened concrete cylinders should be capped with ________, ______, or
_______. - CORRECT ANSWER - cement paste ... gypsum .... mortar sulfur
True or false? Plasters of paris and mixtures of plaster of paris and portland are
examples of suitable high-strength plasters. - CORRECT ANSWER - True
Sulfar mortars and high-strength gypsum cement cubes must demonstrate a
minimum compressive strength of _____ or _____, whichever is greater. -
CORRECT ANSWER - 5000 psi
The cement paste should be applied to the freshly molded cylinder from _____
hours after molding. This is to allow for _____ of the concrete specimen. -
CORRECT ANSWER - 2-4 ... settling
VERIFIED SOLUTIONS (100% CORRECT) | LATEST EXAM UPDATE
Name the two allowable materials with with concrete cylinders may be capped
with. - CORRECT ANSWER - I. High-strength gypsum
II. Sulfur mortar
III. Neat cement paste
Name the three materials with with cylinders may be capped against. - CORRECT
ANSWER - I. Glass
II. Metal
III. Granite
Prior to beginning the capping procedure, what must the metal plate be inspected
for? - CORRECT ANSWER - I. Grooves
II. Gouches
III. Indentations
What is the maximum allowable size of any indentation on the base plate? -
CORRECT ANSWER - 0.010 in [0.25 mm]
Upon receipt of the caping material, for how long can it be kept in intervals? -
CORRECT ANSWER - 3 months
When must the neat cement paste be applied it to the cylinder? - CORRECT
ANSWER - Immediately
,For how long must the concrete settle in the mold prior to applying the neat cement
paste? - CORRECT ANSWER - 2 to 4 hours
Prior to capping, name the three tasks that must be performed on the cylinder. -
CORRECT ANSWER - I. Inspect for any bumps greater than 1/8"
II. Remove foreign debris.
III. Remove any excess water or laitence.
What is the required position of the concrete cylinder? - CORRECT ANSWER -
90° ± 0.5°
Name the required temperature range of the heated sulfar mortar mixture. -
CORRECT ANSWER - 265°F to 290 °F [130 °C to 145 °C]
What is the maximum number of times that the heated sulfur may be used per
cylinder capping procedure? - CORRECT ANSWER - 5 times
These procedures for capping enable concrete cylinders and cores to meet the
standard practice's requirements for _____ and _____. - CORRECT ANSWER -
perpendicularity ... planeness ... perpendicularity
Equipment needed for the capping process includes capping ____ ____ 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 - metal ... glass .... granite
, Sulfar mortar cap plates should be formed against _____ or _____ plates. -
CORRECT ANSWER - marble ... stone
True or false? The purpose of the guide bar or bull's eye level is to ensure that caps
remain perpendicular to the axi of the cylinder within 0.5 degrees. - CORRECT
ANSWER - True
To avoid accidents during reheating of cooled sulfur, use melting pots that have
_____. - CORRECT ANSWER - Metal covers
The technician should use a stiff layer of _____ to cap fresh concrete cylinders. -
CORRECT ANSWER - Burlap
Hardened concrete cylinders should be capped with ________, ______, or
_______. - CORRECT ANSWER - cement paste ... gypsum .... mortar sulfur
True or false? Plasters of paris and mixtures of plaster of paris and portland are
examples of suitable high-strength plasters. - CORRECT ANSWER - True
Sulfar mortars and high-strength gypsum cement cubes must demonstrate a
minimum compressive strength of _____ or _____, whichever is greater. -
CORRECT ANSWER - 5000 psi
The cement paste should be applied to the freshly molded cylinder from _____
hours after molding. This is to allow for _____ of the concrete specimen. -
CORRECT ANSWER - 2-4 ... settling
