ACI WRITTEN EXAM QUESTIONS AND
CORRECT VERIFIED ANSWERS
TheA2sensorA2ofA2theA2temperatureA2measureingA2deviceA2shallA2beA2submergedA2aA2mini
mumA2ofA2____A2inA2-A2Ans--3A2(75mm)
TheA2temperatureA2measureingA2deviceA2shallA2haveA2aA2capacityA2ofA2measuringA2temp
eratureA2ofA2freshlyA2mixedA2conrcreteA2toA2+-
_____A2degreesA2FA2throughtA2aA2rangeA2ofA2_____A2-A2Ans--1(.5A2degreesA2C),A230-
120A2(0-50A2degreesA2C)
TheA2temperatureA2measuringA2deviceA2shallA2beA2calibrated____,A2orA2wheneverA2there
A2isA2aA2questionA2ofA2_____A2-A2Ans--annually,A2accuracy
TheA2tempA2ofA2concreteA2mayA2beA2measuredA2inA2aA2wheelbarrowA2-A2Ans--true
theA2tempA2ofA2concreteA2mayA2beA2measuredA2inA2aA2wallA2formA2-A2Ans--true
AA2compositeA2sampleA2ofA2concreteA2isA2requiredA2evenA2ifA2theA2onlyA2purposeA2forA2obt
ainingA2theA2sampleA2isA2toA2determineA2temp.A2-A2Ans--false
WhatA2mustA2beA2doneA2toA2theA2sampleA2containerA2priorA2toA2samplingA2theA2concreteA2
-A2Ans--dampenA2(withA2water)
whatA2mustA2beA2doneA2toA2theA2concreteA2surroundingA2theA2tempA2measuringA2deviceA2
afterA2theA2deviceA2hasA2submergedA2-A2Ans--
PressA2concreteA2aroundA2measuringA2device
HowA2longA2mustA2theA2tempA2deviceA2remainA2inA2theA2concreteA2-A2Ans--
atA2leastA22A2minutesA2(butA2noA2moreA2thanA25)
AfterA2tempA2ofA2concreteA2isA2read,A2whatA2thenA2isA2requiredA2-A2Ans--
reportingA2ofA2temp
theA2tempA2ofA2concreteA2toA2beA2measuredA2toA2theA2nearestA2____degreeA2FA2-A2Ans--
1A2(.5A2degreeA2C)
AccordingA2toA2theA2ASTMA2C1064A2whatA2isA2oneA2reasonA2toA2takeA2theA2tempA2ofA2con
creteA2-A2Ans--verifyA2conformanceA2toA2aA2specifiedA2requirementA2forA2temp
AA2maxA2tempA2ofA2concreteA2isA2specifiedA2inA2ASTMA2C1064A2-A2Ans--False
TheA2sampleA2ofA2concreteA2usedA2forA2tempA2determinationA2mustA2beA2roddedA225A2tim
esA2-A2Ans--False
, SamplingA2byA2thisA2methodA2isA2requiredA2whenA2testsA2areA2toA2beA2madeA2toA2determin
eA2____A2withA2specificationA2requirementsA2-A2Ans--compliance
TheA2methodA2coversA2samplingA2fromA2fourA2typesA2ofA2mixersA2whichA2areA2_____,A2__
___,A2____,A2andA2_______A2-A2Ans--
stationaryA2mixes,A2pavingA2mixers,A2revolvingA2drumA2mixersA2andA2openA2topA2mixers
TheA2maximumA2allowableA2timeA2betweenA2obtainingA2theA2firstA2andA2finalA2portionsA2of
A2aA2compositeA2sampleA2isA2______A2minutesA2-A2Ans--15
PortionsA2ofA2aA2compositeA2sampleA2shallA2beA2thoroughlyA2remixedA2beforeA2beginningA
2testsA2onA2theA2sampleA2-A2Ans--True
TheA2maximumA2elapsedA2timeA2allowedA2betweenA2obtainingA2theA2finalA2portionA2ofA2th
eA2compositeA2sampleA2andA2beginningA2theA2testsA2forA2slump,A2temp,A2andA2airA2conten
tA2isA2______A2minutesA2-A2Ans--5
theA2moldingA2ofA2strengthA2testA2specimensA2shallA2beginA2withinA2____A2minutesA2afterA
2fabricatingA2theA2compositeA2sampleA2-A2Ans--15
TheA2concreteA2sampleA2mustA2beA2protectedA2fromA2contaminationA2andA2____A2-A2Ans--
rapidA2evaporation
TheA2minimumA2sizeA2sampleA2testA2specimenA2isA2-A2Ans--28A2LA2(1ft^3)
whenA2samplingA2fromA2aA2stationaryA2mixerA2theA2batchA2mustA2beA2sampledA2atA2_____
A2orA2moreA2regularlyA2spacedA2intervalsA2duringA2dischargeA2ofA2theA2middleA2portionA2of
A2theA2batchA2-A2Ans--2
TheA2compositeA2sampleA2forA2aA2pavingA2mixerA2mustA2representA2aA2minimumA2ofA2___
__A2differentA2portionsA2ofA2theA2batchA2ofA2concreteA2takenA2fromA2theA2pileA2afterA2disch
argeA2-A2Ans--5
WhenA2samplingA2fromA2aA2revolvingA2drumA2truckA2mixer,A2concreteA2mustA2beA2sample
dA2atA2aA2minimumA2ofA2______A2regularlyA2spacedA2intervalsA2duringA2dischargeA2ofA2the
A2middleA2portionA2ofA2theA2batchA2-A2Ans--2
ConcreteA2samplesA2fromA2aA2truckA2mixerA2mustA2beA2obtainedA2beforeA2anyA2waterA2orA
2admixturesA2areA2addedA2toA2theA2mixerA2atA2theA2jobA2siteA2-A2Ans--False
TheA2compositeA2sampleA2fromA2aA2truckA2mixerA2mustA2beA2obtainedA2fromA2theA2_____A
2portionA2ofA2theA2batchA2-A2Ans--Middle
WhenA2theA2concreteA2containsA2aggregateA2largerA2thanA2permittedA2forA2aA2particularA2t
estA2method,A2theA2sampleA2foA2concreteA2mustA2beA2______A2______A2beforeA2makingA2
theA2testA2-A2Ans--WetA2Sieved
CORRECT VERIFIED ANSWERS
TheA2sensorA2ofA2theA2temperatureA2measureingA2deviceA2shallA2beA2submergedA2aA2mini
mumA2ofA2____A2inA2-A2Ans--3A2(75mm)
TheA2temperatureA2measureingA2deviceA2shallA2haveA2aA2capacityA2ofA2measuringA2temp
eratureA2ofA2freshlyA2mixedA2conrcreteA2toA2+-
_____A2degreesA2FA2throughtA2aA2rangeA2ofA2_____A2-A2Ans--1(.5A2degreesA2C),A230-
120A2(0-50A2degreesA2C)
TheA2temperatureA2measuringA2deviceA2shallA2beA2calibrated____,A2orA2wheneverA2there
A2isA2aA2questionA2ofA2_____A2-A2Ans--annually,A2accuracy
TheA2tempA2ofA2concreteA2mayA2beA2measuredA2inA2aA2wheelbarrowA2-A2Ans--true
theA2tempA2ofA2concreteA2mayA2beA2measuredA2inA2aA2wallA2formA2-A2Ans--true
AA2compositeA2sampleA2ofA2concreteA2isA2requiredA2evenA2ifA2theA2onlyA2purposeA2forA2obt
ainingA2theA2sampleA2isA2toA2determineA2temp.A2-A2Ans--false
WhatA2mustA2beA2doneA2toA2theA2sampleA2containerA2priorA2toA2samplingA2theA2concreteA2
-A2Ans--dampenA2(withA2water)
whatA2mustA2beA2doneA2toA2theA2concreteA2surroundingA2theA2tempA2measuringA2deviceA2
afterA2theA2deviceA2hasA2submergedA2-A2Ans--
PressA2concreteA2aroundA2measuringA2device
HowA2longA2mustA2theA2tempA2deviceA2remainA2inA2theA2concreteA2-A2Ans--
atA2leastA22A2minutesA2(butA2noA2moreA2thanA25)
AfterA2tempA2ofA2concreteA2isA2read,A2whatA2thenA2isA2requiredA2-A2Ans--
reportingA2ofA2temp
theA2tempA2ofA2concreteA2toA2beA2measuredA2toA2theA2nearestA2____degreeA2FA2-A2Ans--
1A2(.5A2degreeA2C)
AccordingA2toA2theA2ASTMA2C1064A2whatA2isA2oneA2reasonA2toA2takeA2theA2tempA2ofA2con
creteA2-A2Ans--verifyA2conformanceA2toA2aA2specifiedA2requirementA2forA2temp
AA2maxA2tempA2ofA2concreteA2isA2specifiedA2inA2ASTMA2C1064A2-A2Ans--False
TheA2sampleA2ofA2concreteA2usedA2forA2tempA2determinationA2mustA2beA2roddedA225A2tim
esA2-A2Ans--False
, SamplingA2byA2thisA2methodA2isA2requiredA2whenA2testsA2areA2toA2beA2madeA2toA2determin
eA2____A2withA2specificationA2requirementsA2-A2Ans--compliance
TheA2methodA2coversA2samplingA2fromA2fourA2typesA2ofA2mixersA2whichA2areA2_____,A2__
___,A2____,A2andA2_______A2-A2Ans--
stationaryA2mixes,A2pavingA2mixers,A2revolvingA2drumA2mixersA2andA2openA2topA2mixers
TheA2maximumA2allowableA2timeA2betweenA2obtainingA2theA2firstA2andA2finalA2portionsA2of
A2aA2compositeA2sampleA2isA2______A2minutesA2-A2Ans--15
PortionsA2ofA2aA2compositeA2sampleA2shallA2beA2thoroughlyA2remixedA2beforeA2beginningA
2testsA2onA2theA2sampleA2-A2Ans--True
TheA2maximumA2elapsedA2timeA2allowedA2betweenA2obtainingA2theA2finalA2portionA2ofA2th
eA2compositeA2sampleA2andA2beginningA2theA2testsA2forA2slump,A2temp,A2andA2airA2conten
tA2isA2______A2minutesA2-A2Ans--5
theA2moldingA2ofA2strengthA2testA2specimensA2shallA2beginA2withinA2____A2minutesA2afterA
2fabricatingA2theA2compositeA2sampleA2-A2Ans--15
TheA2concreteA2sampleA2mustA2beA2protectedA2fromA2contaminationA2andA2____A2-A2Ans--
rapidA2evaporation
TheA2minimumA2sizeA2sampleA2testA2specimenA2isA2-A2Ans--28A2LA2(1ft^3)
whenA2samplingA2fromA2aA2stationaryA2mixerA2theA2batchA2mustA2beA2sampledA2atA2_____
A2orA2moreA2regularlyA2spacedA2intervalsA2duringA2dischargeA2ofA2theA2middleA2portionA2of
A2theA2batchA2-A2Ans--2
TheA2compositeA2sampleA2forA2aA2pavingA2mixerA2mustA2representA2aA2minimumA2ofA2___
__A2differentA2portionsA2ofA2theA2batchA2ofA2concreteA2takenA2fromA2theA2pileA2afterA2disch
argeA2-A2Ans--5
WhenA2samplingA2fromA2aA2revolvingA2drumA2truckA2mixer,A2concreteA2mustA2beA2sample
dA2atA2aA2minimumA2ofA2______A2regularlyA2spacedA2intervalsA2duringA2dischargeA2ofA2the
A2middleA2portionA2ofA2theA2batchA2-A2Ans--2
ConcreteA2samplesA2fromA2aA2truckA2mixerA2mustA2beA2obtainedA2beforeA2anyA2waterA2orA
2admixturesA2areA2addedA2toA2theA2mixerA2atA2theA2jobA2siteA2-A2Ans--False
TheA2compositeA2sampleA2fromA2aA2truckA2mixerA2mustA2beA2obtainedA2fromA2theA2_____A
2portionA2ofA2theA2batchA2-A2Ans--Middle
WhenA2theA2concreteA2containsA2aggregateA2largerA2thanA2permittedA2forA2aA2particularA2t
estA2method,A2theA2sampleA2foA2concreteA2mustA2beA2______A2______A2beforeA2makingA2
theA2testA2-A2Ans--WetA2Sieved