ACI CERTIFICATION EXAM QUESTIONS
WITH CORRECT ANSWERS 2025
2. T/F: When the concrete contains large aggregate, the testing technician should wet-
sieve the sample before making unit weight tests for use in yield computations. - CORRECT ANSWER -
False
4. T/F: Samples smaller than 28L (1 cu.ft.) are allowed on routine air content, temperature, and slump t
ests. - CORRECT ANSWER -True
7. How do you regulate the rate of discharge of the batch from the revolving truck drum mixer or agitat
or? - CORRECT ANSWER -By the rate of revolution of the drum
10. While the technician is checking the slump of the concrete, there is a decided falling away or sheari
ng off of the concrete from one side of the sample. What should the technician do? -
CORRECT ANSWER -Disregard the test and retest on another portion of the sample
11. The mold is filled in three equal layers by volume, which makes the first third at , and the s
econd third at . - CORRECT ANSWER -2 5/8, 6 1/8
15. What is the difference allowed by ACI when certifying an individual test using a plastic slump cone v
s. a metal slump cone? - CORRECT ANSWER -0.5 inches
16. T/F: The sides of the slump mold should be lightly tapped to consolidate the concrete in the mold. -
CORRECT ANSWER -False
18. T/F: ASTM C 1064 defines the maximum recommended temperature for concrete. -
CORRECT ANSWER -False
19. The temperature test method must be complete with in after obtaining the sample. -
CORRECT ANSWER -5 minutes
, 20. Each Ltemperature-
measuring Ldevice Lshould Lbe Lcalibrated L , Lor Lwhenever Lthere Lis La Lquestion Lof L .
L- LCORRECT LANSWER L-annually, Laccuracy
23. LT/F: LAfter Lstrike Loff Lof Lthe Lmeasure Lused Lto Ldetermine Ldensity, La Lsmall Lquantity Lof
Lconcrete Lmay Lbe Ladded Lto Lcorrect La Ldeficiency? L- LCORRECT LANSWER L-False
26. LWhat Lis Lthe Lrequired Lshape Lat Lthe Lend Lof Lthe Ltamping Lrod? L- LCORRECT
LANSWER L- Lrounded Lto La Lhemispherical Ltip
28. How Ldo Lyou Lfind Lthe Ldensity Lof La Lconcrete Lbatch? L- LCORRECT
LANSWER L- L(mass Lof Lmeasure Lwith Lconcrete L- Lmass Lof Lmeasure) L/
Lvolume Lof Lmeasure
29. How Ldo Lyou Lfind Lthe Lyield Lof La Lconcrete Lbatch? L- LCORRECT
LANSWER L- L(mass Lof Lall Lmaterials Lbatched L/ L(density Lof Lconcrete L*
L27))
33. T/F: LTest Lmethod LASTM LC231 Lis Lintended Lfor Luse Lwith Lall Lconcretes Land Laggregates Lfor
Lwhich Lan Lagg Lregate Lcorrection Lfactor Lcan Lbe Ldetermined L- LCORRECT LANSWER L-False
34. T/F: LThe Lpetcocks Lare Lclosed Lbefore Lpumping Lany Lair Linto Lthe Lchamber Lon Lthe Ltype LB
Lmeter. L- LCORRECT LANSWER L-False
36. The Lsample Lis Lobtained Lin Laccordance Lto L ASTM L C L . L- LCORRECT LANSWER L-172
37. If Lthe Laggregate Lcorrection Lfactor Lfor La Lgiven Lsource Lof Lfine Land Lcoarse Laggregate Lis Lfound Lto
Lbe L0.2
% Lin La Lpressure Lair Lmeter, Land Lan Lair Lcontent Lvalue Lof L5.0% Lis Lread Lon Lthe Lgauge Lof Lthe Lsame Lair
Lmeter Lc Lontaining Lconcrete Lwith Lthe Lsame Laggregate, Lwhat Lis Lthe Lcorrect Lair Lcontent? L- LCORRECT
LANSWER L-4.8%
39. If Lthe Lsample Lis Lvibrated Lthe Lduration Lof Lvibration Lshould Llast L . L- LCORRECT LANSWER
L- LUntil Lthe Lsurface Lconcrete Lis Lsmooth
40. The Lmaximum Lsize Laggregate Lfor Lthis Ltest Lis L . L- LCORRECT LANSWER L-2''
WITH CORRECT ANSWERS 2025
2. T/F: When the concrete contains large aggregate, the testing technician should wet-
sieve the sample before making unit weight tests for use in yield computations. - CORRECT ANSWER -
False
4. T/F: Samples smaller than 28L (1 cu.ft.) are allowed on routine air content, temperature, and slump t
ests. - CORRECT ANSWER -True
7. How do you regulate the rate of discharge of the batch from the revolving truck drum mixer or agitat
or? - CORRECT ANSWER -By the rate of revolution of the drum
10. While the technician is checking the slump of the concrete, there is a decided falling away or sheari
ng off of the concrete from one side of the sample. What should the technician do? -
CORRECT ANSWER -Disregard the test and retest on another portion of the sample
11. The mold is filled in three equal layers by volume, which makes the first third at , and the s
econd third at . - CORRECT ANSWER -2 5/8, 6 1/8
15. What is the difference allowed by ACI when certifying an individual test using a plastic slump cone v
s. a metal slump cone? - CORRECT ANSWER -0.5 inches
16. T/F: The sides of the slump mold should be lightly tapped to consolidate the concrete in the mold. -
CORRECT ANSWER -False
18. T/F: ASTM C 1064 defines the maximum recommended temperature for concrete. -
CORRECT ANSWER -False
19. The temperature test method must be complete with in after obtaining the sample. -
CORRECT ANSWER -5 minutes
, 20. Each Ltemperature-
measuring Ldevice Lshould Lbe Lcalibrated L , Lor Lwhenever Lthere Lis La Lquestion Lof L .
L- LCORRECT LANSWER L-annually, Laccuracy
23. LT/F: LAfter Lstrike Loff Lof Lthe Lmeasure Lused Lto Ldetermine Ldensity, La Lsmall Lquantity Lof
Lconcrete Lmay Lbe Ladded Lto Lcorrect La Ldeficiency? L- LCORRECT LANSWER L-False
26. LWhat Lis Lthe Lrequired Lshape Lat Lthe Lend Lof Lthe Ltamping Lrod? L- LCORRECT
LANSWER L- Lrounded Lto La Lhemispherical Ltip
28. How Ldo Lyou Lfind Lthe Ldensity Lof La Lconcrete Lbatch? L- LCORRECT
LANSWER L- L(mass Lof Lmeasure Lwith Lconcrete L- Lmass Lof Lmeasure) L/
Lvolume Lof Lmeasure
29. How Ldo Lyou Lfind Lthe Lyield Lof La Lconcrete Lbatch? L- LCORRECT
LANSWER L- L(mass Lof Lall Lmaterials Lbatched L/ L(density Lof Lconcrete L*
L27))
33. T/F: LTest Lmethod LASTM LC231 Lis Lintended Lfor Luse Lwith Lall Lconcretes Land Laggregates Lfor
Lwhich Lan Lagg Lregate Lcorrection Lfactor Lcan Lbe Ldetermined L- LCORRECT LANSWER L-False
34. T/F: LThe Lpetcocks Lare Lclosed Lbefore Lpumping Lany Lair Linto Lthe Lchamber Lon Lthe Ltype LB
Lmeter. L- LCORRECT LANSWER L-False
36. The Lsample Lis Lobtained Lin Laccordance Lto L ASTM L C L . L- LCORRECT LANSWER L-172
37. If Lthe Laggregate Lcorrection Lfactor Lfor La Lgiven Lsource Lof Lfine Land Lcoarse Laggregate Lis Lfound Lto
Lbe L0.2
% Lin La Lpressure Lair Lmeter, Land Lan Lair Lcontent Lvalue Lof L5.0% Lis Lread Lon Lthe Lgauge Lof Lthe Lsame Lair
Lmeter Lc Lontaining Lconcrete Lwith Lthe Lsame Laggregate, Lwhat Lis Lthe Lcorrect Lair Lcontent? L- LCORRECT
LANSWER L-4.8%
39. If Lthe Lsample Lis Lvibrated Lthe Lduration Lof Lvibration Lshould Llast L . L- LCORRECT LANSWER
L- LUntil Lthe Lsurface Lconcrete Lis Lsmooth
40. The Lmaximum Lsize Laggregate Lfor Lthis Ltest Lis L . L- LCORRECT LANSWER L-2''
