ASTM ACI Concrete Strength Testing Lab Technician EXAM 90 QUESTIONS AND ANSWERS.

ASTM ACI Concrete Strength Testing
Lab Technician EXAM 90
QUESTIONS AND ANSWERS
ASTM Standard dealing with proper capping methods

C617




The procedure for capping enables concrete cylinders to meet the
standard's requirements for ____ and ____

Planeness and Perpendicularity




equipment needed for the capping process include ____, ____
devices, and ____ pots

plates, alignment, melting




Plates for neat cement and high-strength gypsum plaster caps
should be made of ____, ____, ____, or ____

glass, metal, granite, diabase

,Sulfur mortar cap plates should be formed against _____ or _____

metal or stone




The purpose of the guide bar or bullseye level is that caps remain
perpendicular to the axis of the cylinder within _____ degrees

.5




to avoid accidents during reheating, 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 Portland Cement are examples of suitable
high-strength plasters. True or False?

False- They are not suitable




Sulfur mortars and high strength gypsum cement cubes must
demonstrate a minimum compressive strength of _____ or _____;
whichever is greater.

5000 psi or 35 MPa or the cylinder's strength




The cement paste should be applied to the freshly molded
cylinders from _____ to ______ hours after molding. This is to allow
______ of the concrete specimen.

2 to 4, setting