ACI CERTIFICATION EXAM QUESTIONS AND
VERIFIED ANSWERS 2026
▶ Equipment needed for the capping process includes capping _____ ,
_____devices, and ______ pots.. Answer: Plates, alignment, melting
▶ Plates for neat cement and high strength gypsum plaster caps should be
made of _____, _____, _____ or _____.. Answer: Glass, metal granite or
diabase
▶ Sulfur mortar cap plates should be formed against _____ or _____
plates.. Answer: Metal, Stone
▶ 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?. Answer: True
▶ To avoid accidents during reheating of cooled sulfur, use melting pots
that have _____.. Answer: Peripheral heating
▶ The technician should use a stiff layer of _____ to cap fresh concrete
cylinders.. Answer: Neat cement paste
▶ Hardened concrete cylinders should be capped with _____, _____ or
_____.. Answer: High-strength gypsum paste, neat cement paste, or sulfur
mortar
▶ Plaster of paris and mixtures of plaster of paris and portland cement are
examples of suitable high strength plasters. True or False?. Answer: False
▶ Sulfur mortars and high-strength gypsum cement cubes must
demonstrate a minimum compressive strength of _____ or ___ __,
whichever is greater.. Answer: 35MPa (5000 psi), the cylinder strength
, ▶ The cement paste should be applied to the freshly molded cylinder from
_____ to _____ hours after molding. This is to allow for _____ of the
concrete specimen.. Answer: 2,4, settling
▶ The strength of the paste depends on:
a) the water-cement ratio
b) time
c) the equipment used
d) type of cement. Answer: a, b and d
▶ A slight twisting action will help eliminate _____ and air _____ when the
capping plate is placed onto the mound of the paste.. Answer: Excess
paste, voids
▶ Neat cement paste caps should not be used on dry specimens because
the caps may _____ and _____ when dry.. Answer: Shrink, crack
▶ The technician should remove all _____ or _____ materials from the
ends of hardened concrete cylinders before capping. Answer: Oily, waxy
▶ _____ the pot and recharge with fresh material at intervals to insure that
the oldest material in the pot has not been used more than _____ times..
Answer: Empty, 5
▶ 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 of old caps. True or False?. Answer: False
▶ To avoid _____, the sulfur mortar should be dry when it is added to the
pot. It should be kept away from _____ when heating.. Answer: Foaming,
water
▶ The melting pot for the sulfur mortar must be located under a _____ with
an _____ for _____.. Answer: Hood, exhaust fan, ventillation
▶ Hydrogen sulfide gas, which may be produced during capping, may be
_____, _____, _____, _____ and _____.. Answer: Lethal, nausea,
stomach distress, dizziness, headache, irritation of the eyes.
VERIFIED ANSWERS 2026
▶ Equipment needed for the capping process includes capping _____ ,
_____devices, and ______ pots.. Answer: Plates, alignment, melting
▶ Plates for neat cement and high strength gypsum plaster caps should be
made of _____, _____, _____ or _____.. Answer: Glass, metal granite or
diabase
▶ Sulfur mortar cap plates should be formed against _____ or _____
plates.. Answer: Metal, Stone
▶ 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?. Answer: True
▶ To avoid accidents during reheating of cooled sulfur, use melting pots
that have _____.. Answer: Peripheral heating
▶ The technician should use a stiff layer of _____ to cap fresh concrete
cylinders.. Answer: Neat cement paste
▶ Hardened concrete cylinders should be capped with _____, _____ or
_____.. Answer: High-strength gypsum paste, neat cement paste, or sulfur
mortar
▶ Plaster of paris and mixtures of plaster of paris and portland cement are
examples of suitable high strength plasters. True or False?. Answer: False
▶ Sulfur mortars and high-strength gypsum cement cubes must
demonstrate a minimum compressive strength of _____ or ___ __,
whichever is greater.. Answer: 35MPa (5000 psi), the cylinder strength
, ▶ The cement paste should be applied to the freshly molded cylinder from
_____ to _____ hours after molding. This is to allow for _____ of the
concrete specimen.. Answer: 2,4, settling
▶ The strength of the paste depends on:
a) the water-cement ratio
b) time
c) the equipment used
d) type of cement. Answer: a, b and d
▶ A slight twisting action will help eliminate _____ and air _____ when the
capping plate is placed onto the mound of the paste.. Answer: Excess
paste, voids
▶ Neat cement paste caps should not be used on dry specimens because
the caps may _____ and _____ when dry.. Answer: Shrink, crack
▶ The technician should remove all _____ or _____ materials from the
ends of hardened concrete cylinders before capping. Answer: Oily, waxy
▶ _____ the pot and recharge with fresh material at intervals to insure that
the oldest material in the pot has not been used more than _____ times..
Answer: Empty, 5
▶ 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 of old caps. True or False?. Answer: False
▶ To avoid _____, the sulfur mortar should be dry when it is added to the
pot. It should be kept away from _____ when heating.. Answer: Foaming,
water
▶ The melting pot for the sulfur mortar must be located under a _____ with
an _____ for _____.. Answer: Hood, exhaust fan, ventillation
▶ Hydrogen sulfide gas, which may be produced during capping, may be
_____, _____, _____, _____ and _____.. Answer: Lethal, nausea,
stomach distress, dizziness, headache, irritation of the eyes.
