ACI Concrete Strength Testing Technician
CP-19 (14) | 100% Correct Answers | Verified
| Latest 2024 Version
These procedures for capping enable concrete cylinders and cores to meet the standard's requirements
for ________ and _________. - Planeness, perpendicularity
Equipment needed for the ca...
ACI Concrete Strength Testing Technician
CP-19 (14) | 100% Correct Answers | Verified
| Latest 2024 Version
These procedures for capping enable concrete cylinders and cores to meet the standard's requirements
for ________ and _________. - ✔✔Planeness, perpendicularity
Equipment needed for the capping process includes capping _____ , _____devices, and ______ pots. -
✔✔Plates, alignment, melting
Plates for neat cement and high strength gypsum plaster caps should be made of _____, _____, _____ or
_____. - ✔✔Glass, metal granite or diabase
Sulfur mortar cap plates should be formed against _____ or _____ plates. - ✔✔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? - ✔✔True
To avoid accidents during reheating of cooled sulfur, use melting pots that have _____. - ✔✔Peripheral
heating
The technician should use a stiff layer of _____ to cap fresh concrete cylinders. - ✔✔Neat cement paste
Hardened concrete cylinders should be capped with _____, _____ or _____. - ✔✔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? - ✔✔False
Sulfur mortars and high-strength gypsum cement cubes must demonstrate a minimum compressive
strength of _____ or ___ __, whichever is greater. - ✔✔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. - ✔✔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 - ✔✔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. - ✔✔Excess paste, voids
Neat cement paste caps should not be used on dry specimens because the caps may _____ and _____
when dry. - ✔✔Shrink, crack
The technician should remove all _____ or _____ materials from the ends of hardened concrete
cylinders before capping - ✔✔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. - ✔✔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? -
✔✔False
To avoid _____, the sulfur mortar should be dry when it is added to the pot. It should be kept away from
_____ when heating. - ✔✔Foaming, water
The melting pot for the sulfur mortar must be located under a _____ with an _____ for _____. -
✔✔Hood, exhaust fan, ventillation
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