ACI- Concrete Field-Testing Technician -
Grade 1 {latest 2026 -2027 update}
questions and answers 100% correct
What must occur before a sample of concrete can be taken from a revolving drum
mixer? - correct answer All water and admixtures must be added to the mixer.
ASTM C172- Para (5.2.3)
Describe the different procedures that can be used to collect a sample of concrete
from a stationary or revolving drum mixer. - correct answer ASTM C172- (Para. 5.2.1
and 5.23)
+ Repeatedly pass a receptacle through the entire discharge stream.
+ Completely divert the discharge stream into a sample container.
,What are the required steps for collecting a sample of concrete from a stationary or
revolving drum mixer? - correct answer ASTM C172- (Para. 5.2.1 and 5.2.3)
+ Collect two or more portions of concrete.
+ Take the portions at regularly spaced intervals.
+ Take the portions from the middle of the batch.
Describe the procedure for collecting a sample of pavement concrete deposited on
grade. - correct answer ASTM C172- (Para. 5.2.2)
+ Discharge the contents of the paving mixer.
+ Obtain samples from at least five different portions of the pile.
What is the minimum size for a sample when strength test specimens are to be
molded? - correct answer The minimum size for a sample is 28 L (1 ft3)
,ASTM C172- (Para. 5.1)
What is the maximum allowable time between obtaining the first and final portions of
the composite sample? - correct answer The maximum allowable time= 15min
ASTM C172- (Para. 4.1)
What action is required after the individual concrete samples have been transported
to the place where test are to be performed? - correct answer + Combine and remix
the samples with a shovel.
ASTM C172- (Para. 4.1.1)
, Q22. What should be done if the concrete contains aggregate larger than is appropriate
for the size of the molds or equipment being used? - correct answer + Wet sieving
ASTM C172- (Para. 6.1)
Q23. Start the tests for slump, temperature, and air content within how many min. after
obtaining the final portion of the composite sample? - correct answer + 5min
ASTM C172- (Para. 4.1.2)
Q24. Start molding specimens for strength tests within how many min. after fabricating
the composite sample? - correct answer within 15 min
ASTM C172- (Para. 4.1.2)
Grade 1 {latest 2026 -2027 update}
questions and answers 100% correct
What must occur before a sample of concrete can be taken from a revolving drum
mixer? - correct answer All water and admixtures must be added to the mixer.
ASTM C172- Para (5.2.3)
Describe the different procedures that can be used to collect a sample of concrete
from a stationary or revolving drum mixer. - correct answer ASTM C172- (Para. 5.2.1
and 5.23)
+ Repeatedly pass a receptacle through the entire discharge stream.
+ Completely divert the discharge stream into a sample container.
,What are the required steps for collecting a sample of concrete from a stationary or
revolving drum mixer? - correct answer ASTM C172- (Para. 5.2.1 and 5.2.3)
+ Collect two or more portions of concrete.
+ Take the portions at regularly spaced intervals.
+ Take the portions from the middle of the batch.
Describe the procedure for collecting a sample of pavement concrete deposited on
grade. - correct answer ASTM C172- (Para. 5.2.2)
+ Discharge the contents of the paving mixer.
+ Obtain samples from at least five different portions of the pile.
What is the minimum size for a sample when strength test specimens are to be
molded? - correct answer The minimum size for a sample is 28 L (1 ft3)
,ASTM C172- (Para. 5.1)
What is the maximum allowable time between obtaining the first and final portions of
the composite sample? - correct answer The maximum allowable time= 15min
ASTM C172- (Para. 4.1)
What action is required after the individual concrete samples have been transported
to the place where test are to be performed? - correct answer + Combine and remix
the samples with a shovel.
ASTM C172- (Para. 4.1.1)
, Q22. What should be done if the concrete contains aggregate larger than is appropriate
for the size of the molds or equipment being used? - correct answer + Wet sieving
ASTM C172- (Para. 6.1)
Q23. Start the tests for slump, temperature, and air content within how many min. after
obtaining the final portion of the composite sample? - correct answer + 5min
ASTM C172- (Para. 4.1.2)
Q24. Start molding specimens for strength tests within how many min. after fabricating
the composite sample? - correct answer within 15 min
ASTM C172- (Para. 4.1.2)
