ACI Concrete ASTM Strength Testing
Lab Technician Questions & Answers
C617 - ANSWERSASTM Standard dealing with proper capping methods
Planeness and Perpendicularity - ANSWERSThe procedure for capping enables concrete
cylinders to meet the standard's requirements for ____ and ____
plates, alignment, melting - ANSWERSequipment needed for the capping process include ____,
____ devices, and ____ pots
glass, metal, granite, diabase - ANSWERSPlates for neat cement and high-strength gypsum
plaster caps should be made of ____, ____, ____, or ____
metal or stone - ANSWERSSulfur mortar cap plates should be formed against _____ or _____
.5 - ANSWERSThe purpose of the guide bar or bullseye level is that caps remain perpendicular to
the axis of the cylinder within _____ degrees
peripheral heating - ANSWERSto avoid accidents during reheating, use melting pots that have
_____ _____
Neat Cement Paste - ANSWERSThe technician should use a stiff layer of _____ to cap fresh
concrete cylinders.
, high strength gypsum paste, neat cement paste or sulfur mortar - ANSWERSHardened concrete
cylinders should be capped with _____ _____ _____ _____, _____ _____ _____, or _____
_____.
False- They are not suitable - ANSWERSPlaster of Paris and Portland Cement are examples of
suitable high-strength plasters. True or False?
5000 psi or 35 MPa or the cylinder's strength - ANSWERSSulfur mortars and high strength
gypsum cement cubes must demonstrate a minimum compressive strength of _____ or _____;
whichever is greater.
2 to 4, setting - ANSWERSThe cement paste should be applied to the freshly molded cylinders
from _____ to ______ hours after molding. This is to allow ______ of the concrete specimen.
a, b, d - ANSWERSThe strength of the cement paste depends on: Choose all that apply:
a) water-cement ratio
b) time
c) equipment used
d) type of cement
excess paste, voids - ANSWERSA slight twisting motion will help eliminate _____ and air _____
when the capping plate is placed onto the mound of paste.
shrink, crack - ANSWERSNeat cement paste caps should not be used on dry specimens because
the caps may _____ and _____ when dry.
oily, waxing - ANSWERSThe technician should remove all _____ or _____ materials from the
ends of hardened concrete cylinders before capping
Lab Technician Questions & Answers
C617 - ANSWERSASTM Standard dealing with proper capping methods
Planeness and Perpendicularity - ANSWERSThe procedure for capping enables concrete
cylinders to meet the standard's requirements for ____ and ____
plates, alignment, melting - ANSWERSequipment needed for the capping process include ____,
____ devices, and ____ pots
glass, metal, granite, diabase - ANSWERSPlates for neat cement and high-strength gypsum
plaster caps should be made of ____, ____, ____, or ____
metal or stone - ANSWERSSulfur mortar cap plates should be formed against _____ or _____
.5 - ANSWERSThe purpose of the guide bar or bullseye level is that caps remain perpendicular to
the axis of the cylinder within _____ degrees
peripheral heating - ANSWERSto avoid accidents during reheating, use melting pots that have
_____ _____
Neat Cement Paste - ANSWERSThe technician should use a stiff layer of _____ to cap fresh
concrete cylinders.
, high strength gypsum paste, neat cement paste or sulfur mortar - ANSWERSHardened concrete
cylinders should be capped with _____ _____ _____ _____, _____ _____ _____, or _____
_____.
False- They are not suitable - ANSWERSPlaster of Paris and Portland Cement are examples of
suitable high-strength plasters. True or False?
5000 psi or 35 MPa or the cylinder's strength - ANSWERSSulfur mortars and high strength
gypsum cement cubes must demonstrate a minimum compressive strength of _____ or _____;
whichever is greater.
2 to 4, setting - ANSWERSThe cement paste should be applied to the freshly molded cylinders
from _____ to ______ hours after molding. This is to allow ______ of the concrete specimen.
a, b, d - ANSWERSThe strength of the cement paste depends on: Choose all that apply:
a) water-cement ratio
b) time
c) equipment used
d) type of cement
excess paste, voids - ANSWERSA slight twisting motion will help eliminate _____ and air _____
when the capping plate is placed onto the mound of paste.
shrink, crack - ANSWERSNeat cement paste caps should not be used on dry specimens because
the caps may _____ and _____ when dry.
oily, waxing - ANSWERSThe technician should remove all _____ or _____ materials from the
ends of hardened concrete cylinders before capping
