ACI Concrete Strength Testing Technician
CP-19 (14) UPDATED Exam Questions
and CORRECT Answers
These procedures for capping enable concrete cylinders and cores to meet the standard's
requirements for ________ and _________. - CORRECT ANSWER- Planeness,
perpendicularity
Equipment needed fo...
ACI Concrete Strength Testing Technician
CP-19 (14) UPDATED Exam Questions
and CORRECT Answers
These procedures for capping enable concrete cylinders and cores to meet the standard's
requirements for ________ and _________. - CORRECT ANSWER- ✔✔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- ✔✔Glass, metal granite or diabase
Sulfur mortar cap plates should be formed against _____ or _____ plates. - CORRECT
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? - CORRECT ANSWER- ✔✔True
To avoid accidents during reheating of cooled sulfur, 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
Hardened concrete cylinders should be capped with _____, _____ or _____. - CORRECT
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? - CORRECT ANSWER- ✔✔False
, Sulfur mortars and high-strength gypsum cement cubes must demonstrate a minimum
compressive strength of _____ or ___ __, whichever is greater. - CORRECT 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. - CORRECT
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 - CORRECT 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. - 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
The technician should remove all _____ or _____ materials from the ends of hardened
concrete cylinders before capping - CORRECT 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. - CORRECT 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? - CORRECT 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. - CORRECT ANSWER- ✔✔Foaming, water
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