ACI CONCRETE STRENGTH TESTING TECHNICIAN CP-19 (14) QUESTIONS AND CORRECT VERIFIED ANSWERS

ACI CONCRETE STRENGTH TESTING
TECHNICIAN CP-19 (14) QUESTIONS AND
CORRECT VERIFIED ANSWERS
TheseA2proceduresA2forA2cappingA2enableA2concreteA2cylindersA2andA2coresA2toA2meetA2t
heA2standard'sA2requirementsA2forA2________A2andA2_________.A2-A2Ans--
A2Planeness,A2perpendicularity


EquipmentA2neededA2forA2theA2cappingA2processA2includesA2cappingA2_____A2,A2_____de
vices,A2andA2______A2pots.A2-A2Ans--A2Plates,A2alignment,A2melting

PlatesA2forA2neatA2cementA2andA2highA2strengthA2gypsumA2plasterA2capsA2shouldA2beA2ma
deA2ofA2_____,A2_____,A2_____A2orA2_____.A2-A2Ans--
A2Glass,A2metalA2graniteA2orA2diabase


SulfurA2mortarA2capA2platesA2shouldA2beA2formedA2againstA2_____A2orA2_____A2plates.A2-
A2Ans--A2Metal,A2Stone


TheA2purposeA2ofA2theA2guideA2barA2orA2bull'sA2eyeA2levelA2isA2toA2ensureA2thatA2capsA2re
mainA2perpendicularA2toA2theA2axisA2ofA2theA2cylinderA2withinA20.5A2degrees.A2TrueA2orA2F
alse?A2-A2Ans--A2True

ToA2avoidA2accidentsA2duringA2reheatingA2ofA2cooledA2sulfur,A2useA2meltingA2potsA2thatA2h
aveA2_____.A2-A2Ans--A2PeripheralA2heating

TheA2technicianA2shouldA2useA2aA2stiffA2layerA2ofA2_____A2toA2capA2freshA2concreteA2cylin
ders.A2-A2Ans--A2NeatA2cementA2paste

HardenedA2concreteA2cylindersA2shouldA2beA2cappedA2withA2_____,A2_____A2orA2_____.A2
-A2Ans--A2High-strengthA2gypsumA2paste,A2neatA2cementA2paste,A2orA2sulfurA2mortar

PlasterA2ofA2parisA2andA2mixturesA2ofA2plasterA2ofA2parisA2andA2portlandA2cementA2areA2ex
amplesA2ofA2suitableA2highA2strengthA2plasters.A2TrueA2orA2False?A2-A2Ans--A2False

SulfurA2mortarsA2andA2high-
strengthA2gypsumA2cementA2cubesA2mustA2demonstrateA2aA2minimumA2compressiveA2str
engthA2ofA2_____A2orA2___A2__,A2whicheverA2isA2greater.A2-A2Ans--
A235MPaA2(5000A2psi),A2theA2cylinderA2strength


TheA2cementA2pasteA2shouldA2beA2appliedA2toA2theA2freshlyA2moldedA2cylinderA2fromA2___
__A2toA2_____A2hoursA2afterA2molding.A2ThisA2isA2toA2allowA2forA2_____A2ofA2theA2concrete
A2specimen.A2-A2Ans--A22,4,A2settling


TheA2strengthA2ofA2theA2pasteA2dependsA2on:

, a)A2theA2water-cementA2ratio
b)A2time
c)A2theA2equipmentA2used
d)A2typeA2ofA2cementA2-A2Ans--A2a,A2bA2andA2d

AA2slightA2twistingA2actionA2willA2helpA2eliminateA2_____A2andA2airA2_____A2whenA2theA2ca
ppingA2plateA2isA2placedA2ontoA2theA2moundA2ofA2theA2paste.A2-A2Ans--
A2ExcessA2paste,A2voids


NeatA2cementA2pasteA2capsA2shouldA2notA2beA2usedA2onA2dryA2specimensA2becauseA2theA
2capsA2mayA2_____A2andA2_____A2whenA2dry.A2-A2Ans--A2Shrink,A2crack


TheA2technicianA2shouldA2removeA2allA2_____A2orA2_____A2materialsA2fromA2theA2endsA2of
A2hardenedA2concreteA2cylindersA2beforeA2cappingA2-A2Ans--A2Oily,A2waxy


_____A2theA2potA2andA2rechargeA2withA2freshA2materialA2atA2intervalsA2toA2insureA2thatA2th
eA2oldestA2materialA2inA2theA2potA2hasA2notA2beenA2usedA2moreA2thanA2_____A2times.A2-
A2Ans--A2Empty,A25


WhenA2cappingA2concreteA2cylindersA2withA2aA2compressiveA2strengthA2ofA235A2MPaA2(50
00A2psi)A2orA2greater,A2itA2isA2permittedA2toA2reuseA2compoundA2recoveredA2fromA2theA2ca
ppingA2operationA2ofA2oldA2caps.A2TrueA2orA2False?A2-A2Ans--A2False

ToA2avoidA2_____,A2theA2sulfurA2mortarA2shouldA2beA2dryA2whenA2itA2isA2addedA2toA2theA2p
ot.A2ItA2shouldA2beA2keptA2awayA2fromA2_____A2whenA2heating.A2-A2Ans--
A2Foaming,A2water


TheA2meltingA2potA2forA2theA2sulfurA2mortarA2mustA2beA2locatedA2underA2aA2_____A2withA2a
nA2_____A2forA2_____.A2-A2Ans--A2Hood,A2exhaustA2fan,A2ventillation

HydrogenA2sulfideA2gas,A2whichA2mayA2beA2producedA2duringA2capping,A2mayA2beA2____
_,A2_____,A2_____,A2_____A2andA2_____.A2-A2Ans--
A2Lethal,A2nausea,A2stomachA2distress,A2dizziness,A2headache,A2irritationA2ofA2theA2eyes.


WhenA2qualificationA2testsA2ofA2unbondedA2padsA2areA2required,A2theyA2areA2performedA2
byA2theA2_____A2orA2_____.A2-A2Ans--A2Supplier,A2user

ThisA2standardA2(ASTMA21231)A2establishedA2aA2maximumA2numberA2ofA2padA2reusesA2th
atA2mayA2notA2beA2exceededA2underA2anyA2circumstances.A2TrueA2orA2false?A2-A2Ans--
A2False


UnbondedA2capsA2areA2notA2toA2beA2usedA2forA2acceptanceA2testingA2ofA2concreteA2withA2
compressiveA2strengthA2belowA2_____A2orA2aboveA2_____.A2-A2Ans--
A21500A2psiA2(10A2MPa),A212,000A2psiA2(80A2MPa)