ACI Concrete Strength Testing Technician CP-19
(14) /81 Questions And Answers Updated 2023-2024
Quiz :These procedures for capping enable concrete cylinders and cores to
meet the standard's requirements for ________ and _________. -
Answer :Planeness, perpendicularity
Quiz :Equipment needed for the capping process includes capping _____ ,
_____devices, and ______ pots. - Answer :Plates, alignment, melting
Quiz :Plates for neat cement and high strength gypsum plaster caps should be
made of _____, _____, _____ or _____. - Answer :Glass, metal granite or
diabase
Quiz :Sulfur mortar cap plates should be formed against _____ or _____
plates. - Answer :Metal, Stone
Quiz :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
Quiz :To avoid accidents during reheating of cooled sulfur, use melting pots
that have _____. - Answer :Peripheral heating
Quiz :The technician should use a stiff layer of _____ to cap fresh concrete
cylinders. - Answer :Neat cement paste
Quiz :Hardened concrete cylinders should be capped with _____, _____ or
_____. - Answer :High-strength gypsum paste, neat cement paste, or sulfur
mortar
Quiz :Plaster of paris and mixtures of plaster of paris and portland cement are
examples of suitable high strength plasters. True or False? - Answer :False
Quiz :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
, Quiz :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
Quiz :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
Quiz :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
Quiz :Neat cement paste caps should not be used on dry specimens because
the caps may _____ and _____ when dry. - Answer :Shrink, crack
Quiz :The technician should remove all _____ or _____ materials from the
ends of hardened concrete cylinders before capping - Answer :Oily, waxy
Quiz :_____ 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
Quiz :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
Quiz :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
Quiz :The melting pot for the sulfur mortar must be located under a _____
with an _____ for _____. - Answer :Hood, exhaust fan, ventillation
Quiz :Hydrogen sulfide gas, which may be produced during capping, may be
_____, _____, _____, _____ and _____. - Answer :Lethal, nausea, stomach
distress, dizziness, headache, irritation of the eyes.
