ACI CONCRETE FIELDTESTING TECHNICIAN-
GRADE I QUESTIONS WITH CORRECT
ANSWERS 2025
The sensor of the temperature measuring device shall be submerged a minimum of in. [ m
m] into the freshly mixed concrete. - CORRECT ANSWER -3 in. [75 mm]
The temperature measuring device shall have a capacity of measuring temperature of freshly mixed con
crete to +- degrees F [+- C] throughout a range of . - CORRECT ANSWER -
1 degree F [0.5 C], 30 degrees F to 120 F [0 C to 50 C]
The temperature measuring device shall be calibrated , or whenever there is a question of .
- CORRECT ANSWER -Annually, accuracy
The temperature of concrete may be measured in a wheelbarrow. True or False? - CORRECT ANSWER -
True
The temperature of concrete may be measured in a wall form. True of False - CORRECT ANSWER -True
A composite sample of concrete is required even if the only purpose for obtaining the sample is to dete
rmine temperature. True of False? - CORRECT ANSWER -False
What must be done to the sample container prior to sampling the concrete? - CORRECT ANSWER -
Dampen (with water)
What must be done to the concrete surrounding the temperature measuring device after the device is s
ubmerged in the fresh concrete. - CORRECT ANSWER -
Gently press the concrete around the temperature measuring device at the surface of the concrete
How long must the temperature measuring device remain in the freshly mixed concrete? -
CORRECT ANSWER -At least 2 minutes but not more than 5 minutes
After the temperature of the concrete is read, what is required? - CORRECT ANSWER -
Reporting of temperature
, The Ltemperature Lof Lconcrete Lis Lreported Lto Lthe Lnearest L degrees LF L[ C]
L- LCORRECT LANSWER L-1 Ldegree LF L[0.5 LC]
According Lto LASTM LC1064, Lwhat Lis Lone Lreason Lto Ltake Lthe Ltemperature Lof Lconcrete? L-
CORRECT LANSWER L-Verify Lconformance Lto La Lspecified Lrequirement Lfor Ltemperature Lof Lconcrete
A Lmaximum Ltemperature Lof Lfreshly Lmixed Lconcrete Lis Lspecified Lin LASTM LC1064. LTrue Lof
LFalse? L- LCORRECT LANSWER L-False
The Lsample Lof Lconcrete Lused Lfor Ltemperature Ldetermination Lmust Lbe Lrodded L25 Ltimes. LTrue Lor
LFalse? L- LCORRECT LANSWER L-False
Sampling Lby Lthis Lmethod Lis Lrequired Lwhen Ltests Lare Lto Lbe Lmade Lto Ldetermine L with
Lspecification Lr Lequirements. L- LCORRECT LANSWER L-Compliance
This Lmethod Lcovers Lsampling Lfrom Lfour Ltypes Lof Lmixtures Lwhich Lare L , L ,L , Land L .
L- LCORRECT LANSWER L-Stationary Lmixers, Lpaving Lmixers, Lrevolving Ldrum Lmixers, Land Lopen Ltop
Lmixers
The Lmaximum Lallowable Ltime Lbetween Lobtaining Lthe Lfirst Land Lfinal Lportions Lof La Lcomposite Lsample
Lis L_
minutes. L- LCORRECT LANSWER L-15
Portions Lof La Lcomposite Lsample Lshall Lbe Lthoroughly Lremixed Lbfore Lbeginning Ltests Lon Lthe
Lsample. LTrue Lof LFalse? L- LCORRECT LANSWER L-True
The Lmaximum Lelapsed Ltime Lallowed Lbetween Lobtaining Lthe Lfinal Lportion Lof Lthe Lcomposite
Lsample Land Lbeginning Lthe Ltests Lfor Lslump, Ltemperature, Land Lair Lcontent Lis minutes. L-
LCORRECT LANSWER L-5
The Lmolding Lof Lstrength Ltest Lspecimens Lshall Lbegin Lwithin L minutes Lafter Lfabricating Lthe
Lcomposit Le Lsample. L- LCORRECT LANSWER L-15
The Lconcrete Lsample Lmust Lbe Lprotected Lfrom Lcontamination Land ------ CORRECT LANSWER L-
Rapid Levaporation
GRADE I QUESTIONS WITH CORRECT
ANSWERS 2025
The sensor of the temperature measuring device shall be submerged a minimum of in. [ m
m] into the freshly mixed concrete. - CORRECT ANSWER -3 in. [75 mm]
The temperature measuring device shall have a capacity of measuring temperature of freshly mixed con
crete to +- degrees F [+- C] throughout a range of . - CORRECT ANSWER -
1 degree F [0.5 C], 30 degrees F to 120 F [0 C to 50 C]
The temperature measuring device shall be calibrated , or whenever there is a question of .
- CORRECT ANSWER -Annually, accuracy
The temperature of concrete may be measured in a wheelbarrow. True or False? - CORRECT ANSWER -
True
The temperature of concrete may be measured in a wall form. True of False - CORRECT ANSWER -True
A composite sample of concrete is required even if the only purpose for obtaining the sample is to dete
rmine temperature. True of False? - CORRECT ANSWER -False
What must be done to the sample container prior to sampling the concrete? - CORRECT ANSWER -
Dampen (with water)
What must be done to the concrete surrounding the temperature measuring device after the device is s
ubmerged in the fresh concrete. - CORRECT ANSWER -
Gently press the concrete around the temperature measuring device at the surface of the concrete
How long must the temperature measuring device remain in the freshly mixed concrete? -
CORRECT ANSWER -At least 2 minutes but not more than 5 minutes
After the temperature of the concrete is read, what is required? - CORRECT ANSWER -
Reporting of temperature
, The Ltemperature Lof Lconcrete Lis Lreported Lto Lthe Lnearest L degrees LF L[ C]
L- LCORRECT LANSWER L-1 Ldegree LF L[0.5 LC]
According Lto LASTM LC1064, Lwhat Lis Lone Lreason Lto Ltake Lthe Ltemperature Lof Lconcrete? L-
CORRECT LANSWER L-Verify Lconformance Lto La Lspecified Lrequirement Lfor Ltemperature Lof Lconcrete
A Lmaximum Ltemperature Lof Lfreshly Lmixed Lconcrete Lis Lspecified Lin LASTM LC1064. LTrue Lof
LFalse? L- LCORRECT LANSWER L-False
The Lsample Lof Lconcrete Lused Lfor Ltemperature Ldetermination Lmust Lbe Lrodded L25 Ltimes. LTrue Lor
LFalse? L- LCORRECT LANSWER L-False
Sampling Lby Lthis Lmethod Lis Lrequired Lwhen Ltests Lare Lto Lbe Lmade Lto Ldetermine L with
Lspecification Lr Lequirements. L- LCORRECT LANSWER L-Compliance
This Lmethod Lcovers Lsampling Lfrom Lfour Ltypes Lof Lmixtures Lwhich Lare L , L ,L , Land L .
L- LCORRECT LANSWER L-Stationary Lmixers, Lpaving Lmixers, Lrevolving Ldrum Lmixers, Land Lopen Ltop
Lmixers
The Lmaximum Lallowable Ltime Lbetween Lobtaining Lthe Lfirst Land Lfinal Lportions Lof La Lcomposite Lsample
Lis L_
minutes. L- LCORRECT LANSWER L-15
Portions Lof La Lcomposite Lsample Lshall Lbe Lthoroughly Lremixed Lbfore Lbeginning Ltests Lon Lthe
Lsample. LTrue Lof LFalse? L- LCORRECT LANSWER L-True
The Lmaximum Lelapsed Ltime Lallowed Lbetween Lobtaining Lthe Lfinal Lportion Lof Lthe Lcomposite
Lsample Land Lbeginning Lthe Ltests Lfor Lslump, Ltemperature, Land Lair Lcontent Lis minutes. L-
LCORRECT LANSWER L-5
The Lmolding Lof Lstrength Ltest Lspecimens Lshall Lbegin Lwithin L minutes Lafter Lfabricating Lthe
Lcomposit Le Lsample. L- LCORRECT LANSWER L-15
The Lconcrete Lsample Lmust Lbe Lprotected Lfrom Lcontamination Land ------ CORRECT LANSWER L-
Rapid Levaporation
