[ ACI CONCRETE STRENGTH TESTING TECHNICIAN ]
EXAMINATION COMPLETE QUESTIONS AND DETAILED
SOLUTIONS
LATEST UPDATE THIS YEAR JUST RELEASED
Question 1: When capping cylinders it is acceptable to ___ but not
rock the capping plate in an effort to extrude excess material and
air voids
Answer:
twist
Question 2: (C617) What type of gas can be produced when sulfur
mortar is contaminated with organic material?
Answer:
Hydrogen sulfide gas
Question 3: (C617) When capping cylinders it is acceptable to twist
but not rock the capping plate in an effort to extrude___ ___ and
___ ___
Answer:
excess material and air voids
Question 4: (C617) Neat cement paste caps can ___ and ___ if
allowed to dry
Answer:
,shrink and crack
Question 5: (C617) The end of a capped cylinder must be plane to
within ___in
Answer:
.002in (.05mm)
Question 6: (C617) Empty the pot and recharge with fresh material
to ensure the oldest material is not reheated more than how many
times?
Answer:
5 times
Question 7: (C617) Cement paste should be applied to freshly
molded cylinder within how many hours after molding to allow for
settling of the concrete specimen
Answer:
within 2 to 4 hours
Question 8: (C617) The vertical distance between the highest and
lowest points on the end of an uncapped cylinder shall not exceed
___
Answer:
1/8 inch (3mm)
,Question 9: (C617) The guide bar/bullseye level ensures caps are
perpendicular to the axis within __ degrees
Answer:
.5 degrees
Question 10: (C617) Remove and replace any caps having voids or
steam pockets greater than __in
Answer:
1/4 inch (6mm)
Question 11: (C617) Metal capping plates should be free of gouges
greater than ___in
Answer:
.01 inch (25mm)
Question 12: (C617) In general with high strength gypsum paste, a
capping plate may be removed within how many minutes without
visibly damaging the cap?
Answer:
45 mins
Question 13: What is ASTM C39?
Answer:
Standard Test Method for Compressive strength of cylindrical concrete
specimens
, Question 14: (C39) Compressive strength should be expressed to
the nearest ___psi
Answer:
10 psi (.1 mPA)
Question 15: (C39) A correction factor is needed if the length to
diameter ratio is ___ or less
Answer:
1.75 or less
Question 16: (C39) A 28 day old specimen must be tested within
how many hours of this age?
Answer:
20 hours
Question 17: (C39) The percent of error for loads should not exceed
what percent?
Answer:
+/- 1%
Question 18: What ASTM standard describes the apparatus,
materials, and procedures for capping freshly molded concrete
cylinders with neat cement?
Answer:
ASTM C617
EXAMINATION COMPLETE QUESTIONS AND DETAILED
SOLUTIONS
LATEST UPDATE THIS YEAR JUST RELEASED
Question 1: When capping cylinders it is acceptable to ___ but not
rock the capping plate in an effort to extrude excess material and
air voids
Answer:
twist
Question 2: (C617) What type of gas can be produced when sulfur
mortar is contaminated with organic material?
Answer:
Hydrogen sulfide gas
Question 3: (C617) When capping cylinders it is acceptable to twist
but not rock the capping plate in an effort to extrude___ ___ and
___ ___
Answer:
excess material and air voids
Question 4: (C617) Neat cement paste caps can ___ and ___ if
allowed to dry
Answer:
,shrink and crack
Question 5: (C617) The end of a capped cylinder must be plane to
within ___in
Answer:
.002in (.05mm)
Question 6: (C617) Empty the pot and recharge with fresh material
to ensure the oldest material is not reheated more than how many
times?
Answer:
5 times
Question 7: (C617) Cement paste should be applied to freshly
molded cylinder within how many hours after molding to allow for
settling of the concrete specimen
Answer:
within 2 to 4 hours
Question 8: (C617) The vertical distance between the highest and
lowest points on the end of an uncapped cylinder shall not exceed
___
Answer:
1/8 inch (3mm)
,Question 9: (C617) The guide bar/bullseye level ensures caps are
perpendicular to the axis within __ degrees
Answer:
.5 degrees
Question 10: (C617) Remove and replace any caps having voids or
steam pockets greater than __in
Answer:
1/4 inch (6mm)
Question 11: (C617) Metal capping plates should be free of gouges
greater than ___in
Answer:
.01 inch (25mm)
Question 12: (C617) In general with high strength gypsum paste, a
capping plate may be removed within how many minutes without
visibly damaging the cap?
Answer:
45 mins
Question 13: What is ASTM C39?
Answer:
Standard Test Method for Compressive strength of cylindrical concrete
specimens
, Question 14: (C39) Compressive strength should be expressed to
the nearest ___psi
Answer:
10 psi (.1 mPA)
Question 15: (C39) A correction factor is needed if the length to
diameter ratio is ___ or less
Answer:
1.75 or less
Question 16: (C39) A 28 day old specimen must be tested within
how many hours of this age?
Answer:
20 hours
Question 17: (C39) The percent of error for loads should not exceed
what percent?
Answer:
+/- 1%
Question 18: What ASTM standard describes the apparatus,
materials, and procedures for capping freshly molded concrete
cylinders with neat cement?
Answer:
ASTM C617
