ACI- CONCRETE FIELD-TESTING TECHNICIAN - GRADE 1 QUESTIONS AND CORRECT VERIFIED ANSWERS

ACI- CONCRETE FIELD-TESTING
TECHNICIAN - GRADE 1 QUESTIONS AND
CORRECT VERIFIED ANSWERS
Q1.A2StartA2moldingA2specimensA2forA2strengthA2testsA2withinA230A2minutesA2afterA2fabrica
tingA2theA2compositeA2sample.

A.A2True
B.A2FalseA2-A2Ans--A2B.A2FalseA2

ASTMA2C172A2-ParaA2(4.1.2)A2-A2StartA2molding.
A2
specimensA2forA2strengthA2testsA2withinA215A2minA2afterA2fabricatingA2the
compositeA2sample.

Q2.A2TheA2maximumA2allowableA2timeA2betweenA2obtainingA2theA2firstA2andA2lastA2portion
sA2ofA2theA2compositeA2sampleA2mayA2notA2exceedA25A2minutes.

A.A2True
B.A2FalseA2-A2Ans--A2B.A2FalseA2

ASTMA2C172A2-A2ParaA2(4.1)-
A2TheA2elapsedA2timeA2shallA2notA2exceedA215A2min.A2betweenA2obtainingA2theA2firstA2andA
2finalA2portionsA2ofA2theA2compositeA2sample.


Q3.A2TheA2compositeA2concreteA2sampleA2mustA2beA2protectedA2fromA2sun,A2wind,A2conta
minationA2andA2rapidA2evaporation.

A.A2True
B.A2FalseA2-A2Ans--A2A.A2TrueA2

ASTMA2C172A2-A2ParaA2(4.1.2)

Q4.A2IfA2theA2concreteA2containsA2aggregatesA2largerA2thanA2thoseA2thatA2areA2appropriat
eA2forA2aA2sizeA2ofA2moldA2orA2equipmentA2used,A2theA2sampleA2shouldA2beA2wetA2sievedA2
beforeA2makingA2theA2test.

A.A2True
B.A2FalseA2-A2Ans--A2A.A2True

ASTMA2C172-A2ParaA2(6.1)

Q5.A2TheA2compositeA2sampleA2shouldA2notA2beA2remixedA2beforeA2beginningA2anyA2tests
.

,A.A2True
B.A2FalseA2-A2Ans--A2B.A2False

ASTMA2C172-ParaA2(4.1.1)A2-
TheA2sampleA2shallA2beA2combinedA2andA2remixedA2withA2aA2shovelA2theA2minimumA2amo
untA2necessaryA2toA2ensureA2uniformityA2andA2complianceA2withA2theA2maximumA2timeA2li
mits

Q6.A2SamplingA2shouldA2normallyA2beA2performed,A2asA2theA2concreteA2isA2dischargedA2fr
omA2theA2mixer.

A.A2True
B.A2FalseA2-A2Ans--A2B.A2False

A2ASTMA2C172-ParaA2(5).A2NOTEA22—
SamplingA2shouldA2normallyA2beA2performedA2asA2theA2concreteA2isA2deliveredA2fromA2the
A2mixer.A2


ToA2theA2conveyingA2vehicleA2usedA2toA2transportA2the
concreteA2toA2theA2forms;A2however,A2specificationsA2mayA2requireA2otherA2pointsA2ofA2sa
mpling,A2suchA2asA2theA2dischargeA2ofA2aA2concreteA2pump.

Q7.A2ASTMA2MethodA2C172A2includesA2samplingA2fromA2stationaryA2mixers,A2pavingA2mix
ers,A2truckA2mixers,A2agitators,A2andA2non-agitatingA2equipment.

A.A2True
B.A2FalseA2-A2Ans--A2A.A2TrueA2

ASTMA2C172-A2ParaA2(1.1)

Q8.A2AfterA2samplingA2isA2completed,A2startA2theA2testsA2forA2slumpA2andA2airA2contentA2wi
thin:

A.A22A2½A2minutes
B.A210A2minutes
C.A215A2minutes
D.A2NoneA2ofA2theA2aboveA2-A2Ans--A2D.A2NoneA2ofA2theA2above

ASTMA2C172-
A2ParaA2(4.1.2)A2StartA2testsA2forA2slump,A2temperature,A2andA2airA2contentA2withinA25A2mi
nA2afterA2obtainingA2theA2finalA2portionA2ofA2theA2compositeA2sample.

Q9.A2InA2anyA2case,A2doA2notA2obtainA2samplesA2until:

A.A2AllA2theA2waterA2andA2admixturesA2haveA2beenA2addedA2toA2theA2concrete
B.A2200A2revolutionsA2ofA2theA2drumA2haveA2beenA2obtained

, C.A2½A2ofA2theA2waterA2hasA2beenA2added
D.A2NoneA2ofA2theA2aboveA2-A2Ans--
A2A.A2AllA2theA2waterA2andA2admixturesA2haveA2beenA2addedA2toA2theA2concrete.


ASTMA2C172-
A2ParaA2(5.2.3).A2InA2anyA2caseA2doA2notA2obtainA2samplesA2untilA2afterA2allA2ofA2theA2water
A2hasA2beenA2addedA2toA2theA2mixer.


Q10.A2NoA2samplesA2shallA2beA2takenA2before_________A2orA2after_________A2ofA2theA2
batchA2hasA2beenA2discharged.

A.A210%A2orA2afterA290%
B.A220%A2orA2afterA290%
C.A220%A2orA2afterA280%
D.A2NoneA2ofA2theA2aboveA2-A2Ans--A2A.A210%A2orA2afterA290%

ASTMA2C172-A2ParaA2(5.2.1).

NOTEA23—
NoA2samplesA2shouldA2beA2takenA2beforeA210A2%A2orA2afterA290A2%A2ofA2theA2batchA2hasA2
beenA2discharged.A2

DueA2toA2theA2difficultyA2ofA2determiningA2theA2actualA2quantityA2ofA2concreteA2discharged,
A2theA2intentA2isA2toA2provideA2samplesA2thatA2areA2representativeA2ofA2widelyA2separatedA
2portions,A2butA2notA2theA2beginningA2andA2theA2endA2ofA2theA2load.


Q11.A2WhenA2strengthA2testsA2areA2toA2beA2made,A2theA2minimumA2sizeA2ofA2theA2compos
iteA2sampleA2shallA2be:

A.A2¼A2cubicA2foot
B.A21A2cubicA2foot
C.A2AnyA2convenientA2size
D.A21A2WheelbarrowA2-A2Ans--A2B.A21A2cubicA2foot

ASTMA2C172-A2ParaA2(5.1).

MakeA2theA2samplesA2toA2beA2usedA2forA2strengthA2testsA2aA2minimumA2ofA228A2LA2(1A2ft3).

Q12.A2SampleA2theA2concreteA2fromA2theA2chuteA2ofA2aA2truckA2mixerA2by:

A.A2RaisingA2chuteA2toA2stopA2theA2flowA2andA2scoopA2concreteA2fromA2thereA2intoA2theA2sl
umpA2coneA2andA2cylinderA2molds
B.A2PassingA2aA2receptacleA2completelyA2throughA2theA2dischargeA2steamA2orA2byA2compl
etelyA2divertingA2theA2dischargeA2intoA2theA2sampleA2container
C.A2HoldingA2aA2shovelA2inA2theA2flowA2andA2directA2halfA2intoA2aA2bucket
D.A2NoneA2ofA2theA2aboveA2-A2Ans--A2B.A2